mirror of
https://github.com/fish-shell/fish-shell
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Integrate threads.rs w/ legacy C++ code
Largely routine but for the trampolines in iothread.h and iothread.cpp which were a real PITA to get correct w/ all their variants. Integration is complete with all old code ripped out and the tests using the rust version of the code.
This commit is contained in:
Mahmoud Al-Qudsi
parent
7f9a942f1d
commit
6cd2d0ffed
18 changed files with 292 additions and 580 deletions
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@ -47,6 +47,7 @@ fn main() -> miette::Result<()> {
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"src/timer.rs",
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"src/tokenizer.rs",
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"src/topic_monitor.rs",
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"src/threads.rs",
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"src/trace.rs",
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"src/util.rs",
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"src/wait_handle.rs",
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@ -49,6 +49,86 @@ static NOTIFY_SIGNALLER: once_cell::sync::Lazy<&'static crate::fd_monitor::FdEve
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result
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});
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#[cxx::bridge]
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mod ffi {
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extern "Rust" {
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#[cxx_name = "ASSERT_IS_MAIN_THREAD"]
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fn assert_is_main_thread();
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#[cxx_name = "ASSERT_IS_BACKGROUND_THREAD"]
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fn assert_is_background_thread();
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#[cxx_name = "ASSERT_IS_NOT_FORKED_CHILD"]
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fn assert_is_not_forked_child();
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fn configure_thread_assertions_for_testing();
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fn is_main_thread() -> bool;
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fn is_forked_child() -> bool;
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}
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extern "Rust" {
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#[cxx_name = "make_detached_pthread"]
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fn spawn_ffi(callback: *const u8, param: *const u8) -> bool;
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}
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extern "Rust" {
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fn iothread_port() -> i32;
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fn iothread_service_main();
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#[cxx_name = "iothread_service_main_with_timeout"]
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fn iothread_service_main_with_timeout_ffi(timeout_usec: u64);
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#[cxx_name = "iothread_drain_all"]
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fn iothread_drain_all_ffi();
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#[cxx_name = "iothread_perform"]
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fn iothread_perform_ffi(callback: *const u8, param: *const u8);
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#[cxx_name = "iothread_perform_cantwait"]
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fn iothread_perform_cant_wait_ffi(callback: *const u8, param: *const u8);
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}
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extern "Rust" {
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#[cxx_name = "debounce_t"]
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type Debounce;
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#[cxx_name = "perform"]
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fn perform_ffi(&self, callback: *const u8, param: *const u8) -> u64;
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#[cxx_name = "perform_with_completion"]
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fn perform_with_completion_ffi(
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&self,
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callback: *const u8,
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param1: *const u8,
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completion: *const u8,
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param2: *const u8,
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) -> u64;
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#[cxx_name = "new_debounce_t"]
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fn new_debounce_ffi(timeout_ms: u64) -> Box<Debounce>;
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}
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}
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fn iothread_service_main_with_timeout_ffi(timeout_usec: u64) {
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iothread_service_main_with_timeout(Duration::from_micros(timeout_usec))
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}
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fn iothread_drain_all_ffi() {
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unsafe { iothread_drain_all() }
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}
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fn iothread_perform_ffi(callback: *const u8, param: *const u8) {
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type Callback = extern "C" fn(crate::ffi::void_ptr);
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let callback: Callback = unsafe { std::mem::transmute(callback) };
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let param = param.into();
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iothread_perform(move || {
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callback(param);
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});
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}
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fn iothread_perform_cant_wait_ffi(callback: *const u8, param: *const u8) {
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type Callback = extern "C" fn(crate::ffi::void_ptr);
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let callback: Callback = unsafe { std::mem::transmute(callback) };
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let param = param.into();
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iothread_perform_cant_wait(move || {
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callback(param);
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});
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}
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/// A [`ThreadPool`] or [`Debounce`] work request.
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type WorkItem = Box<dyn FnOnce() + 'static + Send>;
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@ -131,6 +211,18 @@ pub fn is_forked_child() -> bool {
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IS_FORKED_PROC.load(Ordering::Relaxed)
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}
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#[inline(always)]
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pub fn assert_is_not_forked_child() {
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#[cold]
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fn panic_is_forked_child() {
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panic!("Function called from forked child!");
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}
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if is_forked_child() {
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panic_is_forked_child();
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}
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}
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/// The rusty version of `iothreads::make_detached_pthread()`. We will probably need a
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/// `spawn_scoped` version of the same to handle some more advanced borrow cases safely, and maybe
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/// an unsafe version that doesn't do any lifetime checking akin to
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@ -194,6 +286,16 @@ pub fn spawn<F: FnOnce() + Send + 'static>(callback: F) -> bool {
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result
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}
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fn spawn_ffi(callback: *const u8, param: *const u8) -> bool {
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type Callback = extern "C" fn(crate::ffi::void_ptr);
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let callback: Callback = unsafe { std::mem::transmute(callback) };
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let param = param.into();
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spawn(move || {
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callback(param);
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})
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}
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/// Data shared between the thread pool [`ThreadPool`] and worker threads [`WorkerThread`].
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#[derive(Default)]
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struct ThreadPoolProtected {
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@ -422,11 +524,12 @@ pub fn iothread_perform_cant_wait(f: impl FnOnce() + 'static + Send) {
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thread_pool.perform(f, true);
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}
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pub fn iothread_port() -> i32 {
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i32::from(NOTIFY_SIGNALLER.read_fd())
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}
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pub fn iothread_service_main_with_timeout(timeout: Duration) {
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if crate::fd_readable_set::is_fd_readable(
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i32::from(NOTIFY_SIGNALLER.read_fd()),
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timeout.as_millis() as u64,
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) {
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if crate::fd_readable_set::is_fd_readable(iothread_port(), timeout.as_millis() as u64) {
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iothread_service_main();
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}
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}
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@ -491,6 +594,10 @@ struct DebounceData {
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start_time: Instant,
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}
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fn new_debounce_ffi(timeout_ms: u64) -> Box<Debounce> {
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Box::new(Debounce::new(Duration::from_millis(timeout_ms)))
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}
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impl Debounce {
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pub fn new(timeout: Duration) -> Self {
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Self {
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@ -538,6 +645,41 @@ impl Debounce {
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self.perform_inner(h)
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}
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fn perform_with_completion_ffi(
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&self,
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callback: *const u8,
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param1: *const u8,
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completion_callback: *const u8,
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param2: *const u8,
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) -> u64 {
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type Callback = extern "C" fn(crate::ffi::void_ptr) -> crate::ffi::void_ptr;
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type CompletionCallback = extern "C" fn(crate::ffi::void_ptr, crate::ffi::void_ptr);
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let callback: Callback = unsafe { std::mem::transmute(callback) };
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let param1 = param1.into();
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let completion_callback: CompletionCallback =
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unsafe { std::mem::transmute(completion_callback) };
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let param2 = param2.into();
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self.perform_with_completion(
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move || callback(param1),
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move |result| completion_callback(param2, result),
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)
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.into()
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}
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fn perform_ffi(&self, callback: *const u8, param: *const u8) -> u64 {
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type Callback = extern "C" fn(crate::ffi::void_ptr);
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let callback: Callback = unsafe { std::mem::transmute(callback) };
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let param = param.into();
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self.perform(move || {
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callback(param);
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})
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.into()
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}
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/// Enqueue `handler` to be performed on a background thread with [`Completion`] `completion`
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/// to be performed on the main thread. If a function is already enqueued, this overwrites it
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/// and that function will not be executed.
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@ -1373,24 +1373,6 @@ extern "C" {
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}
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}
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void set_main_thread() {
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// Just call thread_id() once to force increment of thread_id.
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uint64_t tid = thread_id();
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assert(tid == 1 && "main thread should have thread ID 1");
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(void)tid;
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}
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void configure_thread_assertions_for_testing() { thread_asserts_cfg_for_testing = true; }
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bool is_forked_child() { return is_forked_proc; }
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void setup_fork_guards() {
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is_forked_proc = false;
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static std::once_flag fork_guard_flag;
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std::call_once(fork_guard_flag,
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[] { pthread_atfork(nullptr, nullptr, [] { is_forked_proc = true; }); });
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}
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void save_term_foreground_process_group() { initial_fg_process_group = tcgetpgrp(STDIN_FILENO); }
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void restore_term_foreground_process_group_for_exit() {
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@ -1407,32 +1389,6 @@ void restore_term_foreground_process_group_for_exit() {
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}
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}
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bool is_main_thread() { return thread_id() == 1; }
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void assert_is_main_thread(const char *who) {
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if (!likely(is_main_thread()) && !unlikely(thread_asserts_cfg_for_testing)) {
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FLOGF(error, L"%s called off of main thread.", who);
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FLOGF(error, L"Break on debug_thread_error to debug.");
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debug_thread_error();
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}
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}
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void assert_is_not_forked_child(const char *who) {
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if (unlikely(is_forked_child())) {
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FLOGF(error, L"%s called in a forked child.", who);
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FLOG(error, L"Break on debug_thread_error to debug.");
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debug_thread_error();
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}
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}
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void assert_is_background_thread(const char *who) {
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if (unlikely(is_main_thread()) && !unlikely(thread_asserts_cfg_for_testing)) {
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FLOGF(error, L"%s called on the main thread (may block!).", who);
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FLOG(error, L"Break on debug_thread_error to debug.");
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debug_thread_error();
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}
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}
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void assert_is_locked(std::mutex &mutex, const char *who, const char *caller) {
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// Note that std::mutex.try_lock() is allowed to return false when the mutex isn't
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// actually locked; fortunately we are checking the opposite so we're safe.
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25
src/common.h
25
src/common.h
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@ -320,14 +320,6 @@ bool should_suppress_stderr_for_tests();
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#define likely(x) __builtin_expect(bool(x), 1)
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#define unlikely(x) __builtin_expect(bool(x), 0)
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void assert_is_main_thread(const char *who);
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#define ASSERT_IS_MAIN_THREAD_TRAMPOLINE(x) assert_is_main_thread(x)
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#define ASSERT_IS_MAIN_THREAD() ASSERT_IS_MAIN_THREAD_TRAMPOLINE(__FUNCTION__)
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void assert_is_background_thread(const char *who);
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#define ASSERT_IS_BACKGROUND_THREAD_TRAMPOLINE(x) assert_is_background_thread(x)
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#define ASSERT_IS_BACKGROUND_THREAD() ASSERT_IS_BACKGROUND_THREAD_TRAMPOLINE(__FUNCTION__)
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/// Useful macro for asserting that a lock is locked. This doesn't check whether this thread locked
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/// it, which it would be nice if it did, but here it is anyways.
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void assert_is_locked(std::mutex &mutex, const char *who, const char *caller);
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@ -538,27 +530,10 @@ wcstring reformat_for_screen(const wcstring &msg, const termsize_t &termsize);
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using timepoint_t = double;
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timepoint_t timef();
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/// Call the following function early in main to set the main thread. This is our replacement for
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/// pthread_main_np().
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void set_main_thread();
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bool is_main_thread();
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/// Configures thread assertions for testing.
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void configure_thread_assertions_for_testing();
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/// Set up a guard to complain if we try to do certain things (like take a lock) after calling fork.
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void setup_fork_guards(void);
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/// Save the value of tcgetpgrp so we can restore it on exit.
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void save_term_foreground_process_group();
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void restore_term_foreground_process_group_for_exit();
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/// Return whether we are the child of a fork.
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bool is_forked_child(void);
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void assert_is_not_forked_child(const char *who);
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#define ASSERT_IS_NOT_FORKED_CHILD_TRAMPOLINE(x) assert_is_not_forked_child(x)
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#define ASSERT_IS_NOT_FORKED_CHILD() ASSERT_IS_NOT_FORKED_CHILD_TRAMPOLINE(__FUNCTION__)
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/// Determines if we are running under Microsoft's Windows Subsystem for Linux to work around
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/// some known limitations and/or bugs.
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/// See https://github.com/Microsoft/WSL/issues/423 and Microsoft/WSL#2997
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@ -35,6 +35,7 @@
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#include "proc.h"
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#include "reader.h"
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#include "termsize.h"
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#include "threads.rs.h"
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#include "wcstringutil.h"
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#include "wutil.h" // IWYU pragma: keep
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@ -33,6 +33,7 @@
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#include "parse_util.h"
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#include "parser.h"
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#include "path.h"
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#include "threads.rs.h"
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#include "util.h"
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#include "wcstringutil.h"
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#include "wildcard.h"
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@ -428,8 +428,6 @@ int main(int argc, char **argv) {
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int my_optind = 0;
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program_name = L"fish";
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set_main_thread();
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setup_fork_guards();
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rust_init();
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signal_unblock_all();
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@ -288,8 +288,6 @@ static std::string no_colorize(const wcstring &text) { return wcs2zstring(text);
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int main(int argc, char *argv[]) {
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program_name = L"fish_indent";
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set_main_thread();
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setup_fork_guards();
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rust_init();
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// Using the user's default locale could be a problem if it doesn't use UTF-8 encoding. That's
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// because the fish project assumes Unicode UTF-8 encoding in all of its scripts.
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@ -272,8 +272,6 @@ static void process_input(bool continuous_mode, bool verbose) {
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/// Setup our environment (e.g., tty modes), process key strokes, then reset the environment.
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[[noreturn]] static void setup_and_process_keys(bool continuous_mode, bool verbose) {
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set_interactive_session(true);
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set_main_thread();
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setup_fork_guards();
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rust_init();
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env_init();
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reader_init();
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@ -805,7 +805,7 @@ static void test_debounce() {
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say(L"Testing debounce");
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// Run 8 functions using a condition variable.
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// Only the first and last should run.
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debounce_t db;
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auto db = new_debounce_t(0);
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constexpr size_t count = 8;
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std::array<bool, count> handler_ran = {};
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std::array<bool, count> completion_ran = {};
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@ -817,14 +817,14 @@ static void test_debounce() {
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// "Enqueue" all functions. Each one waits until ready_to_go.
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for (size_t idx = 0; idx < count; idx++) {
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do_test(handler_ran[idx] == false);
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db.perform(
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[&, idx] {
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std::function<size_t()> performer = [&, idx] {
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std::unique_lock<std::mutex> lock(m);
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cv.wait(lock, [&] { return ready_to_go; });
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handler_ran[idx] = true;
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return idx;
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},
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[&](size_t idx) { completion_ran[idx] = true; });
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};
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std::function<void(size_t)> completer = [&](size_t idx) { completion_ran[idx] = true; };
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debounce_perform_with_completion(*db, std::move(performer), std::move(completer));
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}
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// We're ready to go.
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@ -863,7 +863,7 @@ static void test_debounce_timeout() {
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// Use a shared_ptr so we don't have to join our threads.
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const long timeout_ms = 500;
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struct data_t {
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debounce_t db{timeout_ms};
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rust::box<debounce_t> db = new_debounce_t(timeout_ms);
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bool exit_ok = false;
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std::mutex m;
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std::condition_variable cv;
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@ -879,14 +879,14 @@ static void test_debounce_timeout() {
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};
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// Spawn the handler twice. This should not modify the thread token.
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uint64_t token1 = data->db.perform(handler);
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uint64_t token2 = data->db.perform(handler);
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uint64_t token1 = debounce_perform(*data->db, handler);
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uint64_t token2 = debounce_perform(*data->db, handler);
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do_test(token1 == token2);
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// Wait 75 msec, then enqueue something else; this should spawn a new thread.
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std::this_thread::sleep_for(std::chrono::milliseconds(timeout_ms + timeout_ms / 2));
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do_test(data->running == 1);
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uint64_t token3 = data->db.perform(handler);
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uint64_t token3 = debounce_perform(*data->db, handler);
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do_test(token3 > token2);
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// Release all the threads.
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@ -6493,8 +6493,6 @@ int main(int argc, char **argv) {
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uname(&uname_info);
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say(L"Testing low-level functionality");
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set_main_thread();
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setup_fork_guards();
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rust_init();
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proc_init();
|
||||
env_init();
|
||||
|
|
|
|||
|
|
@ -36,6 +36,7 @@
|
|||
#include "parser.h"
|
||||
#include "path.h"
|
||||
#include "redirection.h"
|
||||
#include "threads.rs.h"
|
||||
#include "tokenizer.h"
|
||||
#include "wcstringutil.h"
|
||||
#include "wildcard.h"
|
||||
|
|
|
|||
|
|
@ -29,6 +29,7 @@
|
|||
#include "proc.h"
|
||||
#include "reader.h"
|
||||
#include "signals.h" // IWYU pragma: keep
|
||||
#include "threads.rs.h"
|
||||
#include "wutil.h" // IWYU pragma: keep
|
||||
|
||||
/// A name for our own key mapping for nul.
|
||||
|
|
|
|||
|
|
@ -21,6 +21,7 @@
|
|||
#include "maybe.h"
|
||||
#include "path.h"
|
||||
#include "redirection.h"
|
||||
#include "threads.rs.h"
|
||||
#include "wutil.h" // IWYU pragma: keep
|
||||
|
||||
/// File redirection error message.
|
||||
|
|
|
|||
422
src/iothread.cpp
422
src/iothread.cpp
|
|
@ -2,420 +2,16 @@
|
|||
|
||||
#include "iothread.h"
|
||||
|
||||
#include <pthread.h>
|
||||
#include <signal.h>
|
||||
#include <stdio.h>
|
||||
|
||||
#include <atomic>
|
||||
#include <chrono>
|
||||
#include <condition_variable> // IWYU pragma: keep
|
||||
#include <functional>
|
||||
#include <mutex>
|
||||
#include <queue>
|
||||
#include <vector>
|
||||
|
||||
#include "common.h"
|
||||
#include "fallback.h"
|
||||
#include "fd_readable_set.rs.h"
|
||||
#include "fds.h"
|
||||
#include "flog.h"
|
||||
#include "maybe.h"
|
||||
|
||||
/// We just define a thread limit of 1024.
|
||||
#define IO_MAX_THREADS 1024
|
||||
|
||||
// iothread has a thread pool. Sometimes there's no work to do, but extant threads wait around for a
|
||||
// while (on a condition variable) in case new work comes soon. However condition variables are not
|
||||
// properly instrumented with Thread Sanitizer, so it fails to recognize when our mutex is locked.
|
||||
// See https://github.com/google/sanitizers/issues/1259
|
||||
// When using TSan, disable the wait-around feature.
|
||||
#ifdef FISH_TSAN_WORKAROUNDS
|
||||
#define IO_WAIT_FOR_WORK_DURATION_MS 0
|
||||
#else
|
||||
#define IO_WAIT_FOR_WORK_DURATION_MS 500
|
||||
#endif
|
||||
|
||||
using void_function_t = std::function<void()>;
|
||||
|
||||
namespace {
|
||||
struct work_request_t : noncopyable_t {
|
||||
void_function_t handler;
|
||||
explicit work_request_t(void_function_t &&f) : handler(std::move(f)) {}
|
||||
};
|
||||
|
||||
struct thread_pool_t : noncopyable_t, nonmovable_t {
|
||||
struct data_t {
|
||||
/// The queue of outstanding, unclaimed requests.
|
||||
std::queue<work_request_t> request_queue{};
|
||||
|
||||
/// The number of threads that exist in the pool.
|
||||
size_t total_threads{0};
|
||||
|
||||
/// The number of threads which are waiting for more work.
|
||||
size_t waiting_threads{0};
|
||||
};
|
||||
|
||||
/// Data which needs to be atomically accessed.
|
||||
owning_lock<data_t> req_data{};
|
||||
|
||||
/// The condition variable used to wake up waiting threads.
|
||||
/// Note this is tied to data's lock.
|
||||
std::condition_variable queue_cond{};
|
||||
|
||||
/// The minimum and maximum number of threads.
|
||||
/// Here "minimum" means threads that are kept waiting in the pool.
|
||||
/// Note that the pool is initially empty and threads may decide to exit based on a time wait.
|
||||
const size_t soft_min_threads;
|
||||
const size_t max_threads;
|
||||
|
||||
/// Construct with a soft minimum and maximum thread count.
|
||||
thread_pool_t(size_t soft_min_threads, size_t max_threads)
|
||||
: soft_min_threads(soft_min_threads), max_threads(max_threads) {}
|
||||
|
||||
/// Enqueue a new work item onto the thread pool.
|
||||
/// The function \p func will execute in one of the pool's threads.
|
||||
/// If \p cant_wait is set, disrespect the thread limit, because extant threads may
|
||||
/// want to wait for new threads.
|
||||
int perform(void_function_t &&func, bool cant_wait);
|
||||
|
||||
private:
|
||||
/// The worker loop for this thread.
|
||||
void *run();
|
||||
|
||||
/// Dequeue a work item (perhaps waiting on the condition variable), or commit to exiting by
|
||||
/// reducing the active thread count.
|
||||
/// This runs in the background thread.
|
||||
maybe_t<work_request_t> dequeue_work_or_commit_to_exit();
|
||||
|
||||
/// Trampoline function for pthread_spawn compatibility.
|
||||
static void *run_trampoline(void *vpool);
|
||||
|
||||
/// Attempt to spawn a new pthread.
|
||||
bool spawn() const;
|
||||
};
|
||||
|
||||
/// The thread pool for "iothreads" which are used to lift I/O off of the main thread.
|
||||
/// These are used for completions, etc.
|
||||
/// Leaked to avoid shutdown dtor registration (including tsan).
|
||||
static thread_pool_t &s_io_thread_pool = *(new thread_pool_t(1, IO_MAX_THREADS));
|
||||
|
||||
/// A queue of "things to do on the main thread."
|
||||
using main_thread_queue_t = std::vector<void_function_t>;
|
||||
static owning_lock<main_thread_queue_t> s_main_thread_queue;
|
||||
|
||||
/// \return the signaller for completions and main thread requests.
|
||||
static fd_event_signaller_t &get_notify_signaller() {
|
||||
// Leaked to avoid shutdown dtors.
|
||||
static auto s_signaller = new fd_event_signaller_t();
|
||||
return *s_signaller;
|
||||
}
|
||||
|
||||
/// Dequeue a work item (perhaps waiting on the condition variable), or commit to exiting by
|
||||
/// reducing the active thread count.
|
||||
maybe_t<work_request_t> thread_pool_t::dequeue_work_or_commit_to_exit() {
|
||||
auto data = this->req_data.acquire();
|
||||
// If the queue is empty, check to see if we should wait.
|
||||
// We should wait if our exiting would drop us below the soft min.
|
||||
if (data->request_queue.empty() && data->total_threads == this->soft_min_threads &&
|
||||
IO_WAIT_FOR_WORK_DURATION_MS > 0) {
|
||||
data->waiting_threads += 1;
|
||||
this->queue_cond.wait_for(data.get_lock(),
|
||||
std::chrono::milliseconds(IO_WAIT_FOR_WORK_DURATION_MS));
|
||||
data->waiting_threads -= 1;
|
||||
}
|
||||
|
||||
// Now that we've perhaps waited, see if there's something on the queue.
|
||||
maybe_t<work_request_t> result{};
|
||||
if (!data->request_queue.empty()) {
|
||||
result = std::move(data->request_queue.front());
|
||||
data->request_queue.pop();
|
||||
}
|
||||
// If we are returning none, then ensure we balance the thread count increment from when we were
|
||||
// created. This has to be done here in this awkward place because we've already committed to
|
||||
// exiting - we will never pick up more work. So we need to ensure we decrement the thread count
|
||||
// while holding the lock as we are effectively exited.
|
||||
if (!result) {
|
||||
data->total_threads -= 1;
|
||||
}
|
||||
extern "C" const void *iothread_trampoline(const void *c) {
|
||||
iothread_callback_t *callback = (iothread_callback_t *)c;
|
||||
auto *result = (callback->callback)(callback->param);
|
||||
delete callback;
|
||||
return result;
|
||||
}
|
||||
|
||||
static intptr_t this_thread() { return (intptr_t)pthread_self(); }
|
||||
|
||||
void *thread_pool_t::run() {
|
||||
while (auto req = dequeue_work_or_commit_to_exit()) {
|
||||
FLOGF(iothread, L"pthread %p got work", this_thread());
|
||||
// Perform the work
|
||||
req->handler();
|
||||
extern "C" const void *iothread_trampoline2(const void *c, const void *p) {
|
||||
iothread_callback_t *callback = (iothread_callback_t *)c;
|
||||
auto *result = (callback->callback)(p);
|
||||
delete callback;
|
||||
return result;
|
||||
}
|
||||
FLOGF(iothread, L"pthread %p exiting", this_thread());
|
||||
return nullptr;
|
||||
}
|
||||
|
||||
void *thread_pool_t::run_trampoline(void *pool) {
|
||||
assert(pool && "No thread pool given");
|
||||
return static_cast<thread_pool_t *>(pool)->run();
|
||||
}
|
||||
|
||||
/// Spawn another thread. No lock is held when this is called.
|
||||
bool thread_pool_t::spawn() const {
|
||||
return make_detached_pthread(&run_trampoline, const_cast<thread_pool_t *>(this));
|
||||
}
|
||||
|
||||
int thread_pool_t::perform(void_function_t &&func, bool cant_wait) {
|
||||
assert(func && "Missing function");
|
||||
// Note we permit an empty completion.
|
||||
struct work_request_t req(std::move(func));
|
||||
int local_thread_count = -1;
|
||||
auto &pool = s_io_thread_pool;
|
||||
bool spawn_new_thread = false;
|
||||
bool wakeup_thread = false;
|
||||
{
|
||||
// Lock around a local region.
|
||||
auto data = pool.req_data.acquire();
|
||||
data->request_queue.push(std::move(req));
|
||||
FLOGF(iothread, L"enqueuing work item (count is %lu)", data->request_queue.size());
|
||||
if (data->waiting_threads >= data->request_queue.size()) {
|
||||
// There's enough waiting threads, wake one up.
|
||||
wakeup_thread = true;
|
||||
} else if (cant_wait || data->total_threads < pool.max_threads) {
|
||||
// No threads are waiting but we can or must spawn a new thread.
|
||||
data->total_threads += 1;
|
||||
spawn_new_thread = true;
|
||||
}
|
||||
local_thread_count = data->total_threads;
|
||||
}
|
||||
|
||||
// Kick off the thread if we decided to do so.
|
||||
if (wakeup_thread) {
|
||||
FLOGF(iothread, L"notifying thread: %p", this_thread());
|
||||
pool.queue_cond.notify_one();
|
||||
}
|
||||
if (spawn_new_thread) {
|
||||
// Spawn a thread. If this fails, it means there's already a bunch of threads; it is very
|
||||
// unlikely that they are all on the verge of exiting, so one is likely to be ready to
|
||||
// handle extant requests. So we can ignore failure with some confidence.
|
||||
if (this->spawn()) {
|
||||
FLOGF(iothread, L"pthread spawned");
|
||||
} else {
|
||||
// We failed to spawn a thread; decrement the thread count.
|
||||
pool.req_data.acquire()->total_threads -= 1;
|
||||
}
|
||||
}
|
||||
return local_thread_count;
|
||||
}
|
||||
} // namespace
|
||||
|
||||
void iothread_perform_impl(void_function_t &&func, bool cant_wait) {
|
||||
ASSERT_IS_NOT_FORKED_CHILD();
|
||||
s_io_thread_pool.perform(std::move(func), cant_wait);
|
||||
}
|
||||
|
||||
int iothread_port() { return get_notify_signaller().read_fd(); }
|
||||
|
||||
void iothread_service_main_with_timeout(uint64_t timeout_usec) {
|
||||
if (is_fd_readable(iothread_port(), timeout_usec)) {
|
||||
iothread_service_main();
|
||||
}
|
||||
}
|
||||
|
||||
/// At the moment, this function is only used in the test suite.
|
||||
void iothread_drain_all() {
|
||||
// Nasty polling via select().
|
||||
while (s_io_thread_pool.req_data.acquire()->total_threads > 0) {
|
||||
iothread_service_main_with_timeout(1000);
|
||||
}
|
||||
}
|
||||
|
||||
// Service the main thread queue, by invoking any functions enqueued for the main thread.
|
||||
void iothread_service_main() {
|
||||
ASSERT_IS_MAIN_THREAD();
|
||||
// Note the order here is important: we must consume events before handling requests, as posting
|
||||
// uses the opposite order.
|
||||
(void)get_notify_signaller().try_consume();
|
||||
|
||||
// Move the queue to a local variable.
|
||||
// Note the s_main_thread_queue lock is not held after this.
|
||||
main_thread_queue_t queue;
|
||||
s_main_thread_queue.acquire()->swap(queue);
|
||||
|
||||
// Perform each completion in order.
|
||||
for (const void_function_t &func : queue) {
|
||||
// ensure we don't invoke empty functions, that raises an exception
|
||||
if (func) func();
|
||||
}
|
||||
}
|
||||
|
||||
bool make_detached_pthread(void *(*func)(void *), void *param) {
|
||||
// The spawned thread inherits our signal mask. Temporarily block signals, spawn the thread, and
|
||||
// then restore it. But we must not block SIGBUS, SIGFPE, SIGILL, or SIGSEGV; that's undefined
|
||||
// (#7837). Conservatively don't try to mask SIGKILL or SIGSTOP either; that's ignored on Linux
|
||||
// but maybe has an effect elsewhere.
|
||||
sigset_t new_set, saved_set;
|
||||
sigfillset(&new_set);
|
||||
sigdelset(&new_set, SIGILL); // bad jump
|
||||
sigdelset(&new_set, SIGFPE); // divide by zero
|
||||
sigdelset(&new_set, SIGBUS); // unaligned memory access
|
||||
sigdelset(&new_set, SIGSEGV); // bad memory access
|
||||
sigdelset(&new_set, SIGSTOP); // unblockable
|
||||
sigdelset(&new_set, SIGKILL); // unblockable
|
||||
DIE_ON_FAILURE(pthread_sigmask(SIG_BLOCK, &new_set, &saved_set));
|
||||
|
||||
// Spawn a thread. If this fails, it means there's already a bunch of threads; it is very
|
||||
// unlikely that they are all on the verge of exiting, so one is likely to be ready to handle
|
||||
// extant requests. So we can ignore failure with some confidence.
|
||||
pthread_t thread;
|
||||
pthread_attr_t thread_attr;
|
||||
DIE_ON_FAILURE(pthread_attr_init(&thread_attr));
|
||||
|
||||
int err = pthread_attr_setdetachstate(&thread_attr, PTHREAD_CREATE_DETACHED);
|
||||
if (err == 0) {
|
||||
err = pthread_create(&thread, &thread_attr, func, param);
|
||||
if (err == 0) {
|
||||
FLOGF(iothread, "pthread %d spawned", thread);
|
||||
} else {
|
||||
perror("pthread_create");
|
||||
}
|
||||
int err2 = pthread_attr_destroy(&thread_attr);
|
||||
if (err2 != 0) {
|
||||
perror("pthread_attr_destroy");
|
||||
err = err2;
|
||||
}
|
||||
} else {
|
||||
perror("pthread_attr_setdetachstate");
|
||||
}
|
||||
// Restore our sigmask.
|
||||
DIE_ON_FAILURE(pthread_sigmask(SIG_SETMASK, &saved_set, nullptr));
|
||||
return err == 0;
|
||||
}
|
||||
|
||||
using void_func_t = std::function<void(void)>;
|
||||
|
||||
static void *func_invoker(void *param) {
|
||||
// Acquire a thread id for this thread.
|
||||
(void)thread_id();
|
||||
auto vf = static_cast<void_func_t *>(param);
|
||||
(*vf)();
|
||||
delete vf;
|
||||
return nullptr;
|
||||
}
|
||||
|
||||
bool make_detached_pthread(void_func_t &&func) {
|
||||
// Copy the function into a heap allocation.
|
||||
auto vf = new void_func_t(std::move(func));
|
||||
if (make_detached_pthread(func_invoker, vf)) {
|
||||
return true;
|
||||
}
|
||||
// Thread spawning failed, clean up our heap allocation.
|
||||
delete vf;
|
||||
return false;
|
||||
}
|
||||
|
||||
static uint64_t next_thread_id() {
|
||||
// Note 0 is an invalid thread id.
|
||||
// Note fetch_add is a CAS which returns the value *before* the modification.
|
||||
static std::atomic<uint64_t> s_last_thread_id{};
|
||||
uint64_t res = 1 + s_last_thread_id.fetch_add(1, std::memory_order_relaxed);
|
||||
return res;
|
||||
}
|
||||
|
||||
uint64_t thread_id() {
|
||||
static FISH_THREAD_LOCAL uint64_t tl_tid = next_thread_id();
|
||||
return tl_tid;
|
||||
}
|
||||
|
||||
// Debounce implementation note: we would like to enqueue at most one request, except if a thread
|
||||
// hangs (e.g. on fs access) then we do not want to block indefinitely; such threads are called
|
||||
// "abandoned". This is implemented via a monotone uint64 counter, called a token.
|
||||
// Every time we spawn a thread, increment the token. When the thread is completed, it compares its
|
||||
// token to the active token; if they differ then this thread was abandoned.
|
||||
struct debounce_t::impl_t {
|
||||
// Synchronized data from debounce_t.
|
||||
struct data_t {
|
||||
// The (at most 1) next enqueued request, or none if none.
|
||||
maybe_t<work_request_t> next_req{};
|
||||
|
||||
// The token of the current non-abandoned thread, or 0 if no thread is running.
|
||||
uint64_t active_token{0};
|
||||
|
||||
// The next token to use when spawning a thread.
|
||||
uint64_t next_token{1};
|
||||
|
||||
// The start time of the most recently run thread spawn, or request (if any).
|
||||
std::chrono::time_point<std::chrono::steady_clock> start_time{};
|
||||
};
|
||||
owning_lock<data_t> data{};
|
||||
|
||||
/// Run an iteration in the background, with the given thread token.
|
||||
/// \return true if we handled a request, false if there were none.
|
||||
bool run_next(uint64_t token);
|
||||
};
|
||||
|
||||
bool debounce_t::impl_t::run_next(uint64_t token) {
|
||||
assert(token > 0 && "Invalid token");
|
||||
// Note we are on a background thread.
|
||||
maybe_t<work_request_t> req;
|
||||
{
|
||||
auto d = data.acquire();
|
||||
if (d->next_req) {
|
||||
// The value was dequeued, we are going to execute it.
|
||||
req = d->next_req.acquire();
|
||||
d->start_time = std::chrono::steady_clock::now();
|
||||
} else {
|
||||
// There is no request. If we are active, mark ourselves as no longer running.
|
||||
if (token == d->active_token) {
|
||||
d->active_token = 0;
|
||||
}
|
||||
return false;
|
||||
}
|
||||
}
|
||||
|
||||
assert(req && req->handler && "Request should have value");
|
||||
req->handler();
|
||||
return true;
|
||||
}
|
||||
|
||||
uint64_t debounce_t::perform(std::function<void()> handler) {
|
||||
uint64_t active_token{0};
|
||||
bool spawn{false};
|
||||
// Local lock.
|
||||
{
|
||||
auto d = impl_->data.acquire();
|
||||
d->next_req = work_request_t{std::move(handler)};
|
||||
// If we have a timeout, and our running thread has exceeded it, abandon that thread.
|
||||
if (d->active_token && timeout_msec_ > 0 &&
|
||||
std::chrono::steady_clock::now() - d->start_time >
|
||||
std::chrono::milliseconds(timeout_msec_)) {
|
||||
// Abandon this thread by marking nothing as active.
|
||||
d->active_token = 0;
|
||||
}
|
||||
if (!d->active_token) {
|
||||
// We need to spawn a new thread.
|
||||
// Mark the current time so that a new request won't immediately abandon us.
|
||||
spawn = true;
|
||||
d->active_token = d->next_token++;
|
||||
d->start_time = std::chrono::steady_clock::now();
|
||||
}
|
||||
active_token = d->active_token;
|
||||
assert(active_token && "Something should be active");
|
||||
}
|
||||
if (spawn) {
|
||||
// Equip our background thread with a reference to impl, to keep it alive.
|
||||
auto impl = impl_;
|
||||
iothread_perform([=] {
|
||||
while (impl->run_next(active_token))
|
||||
; // pass
|
||||
});
|
||||
}
|
||||
return active_token;
|
||||
}
|
||||
|
||||
// static
|
||||
void debounce_t::enqueue_main_thread_result(std::function<void()> func) {
|
||||
s_main_thread_queue.acquire()->push_back(std::move(func));
|
||||
get_notify_signaller().post();
|
||||
}
|
||||
|
||||
debounce_t::debounce_t(long timeout_msec)
|
||||
: timeout_msec_(timeout_msec), impl_(std::make_shared<impl_t>()) {}
|
||||
debounce_t::~debounce_t() = default;
|
||||
|
|
|
|||
155
src/iothread.h
155
src/iothread.h
|
|
@ -1,90 +1,123 @@
|
|||
// Handles IO that may hang.
|
||||
#ifndef FISH_IOTHREAD_H
|
||||
#define FISH_IOTHREAD_H
|
||||
#if INCLUDE_RUST_HEADERS
|
||||
|
||||
#include <cstdint> // for uint64_t
|
||||
#include <cstdlib>
|
||||
#include <functional>
|
||||
#include <memory>
|
||||
#include <utility>
|
||||
|
||||
/// \return the fd on which to listen for completion callbacks.
|
||||
int iothread_port();
|
||||
#include "threads.rs.h"
|
||||
|
||||
/// Services iothread main thread completions and requests.
|
||||
/// This does not block.
|
||||
void iothread_service_main();
|
||||
struct iothread_callback_t {
|
||||
std::function<void *(const void *param)> callback;
|
||||
void *param;
|
||||
|
||||
// Services any main thread requests. Does not wait more than \p timeout_usec.
|
||||
void iothread_service_main_with_timeout(uint64_t timeout_usec);
|
||||
~iothread_callback_t() {
|
||||
if (param) {
|
||||
free(param);
|
||||
param = nullptr;
|
||||
}
|
||||
}
|
||||
};
|
||||
|
||||
/// Waits for all iothreads to terminate.
|
||||
/// This is a hacky function only used in the test suite.
|
||||
void iothread_drain_all();
|
||||
|
||||
// Internal implementation
|
||||
void iothread_perform_impl(std::function<void()> &&, bool cant_wait = false);
|
||||
extern "C" const void *iothread_trampoline(const void *callback);
|
||||
extern "C" const void *iothread_trampoline2(const void *callback, const void *param);
|
||||
|
||||
// iothread_perform invokes a handler on a background thread.
|
||||
inline void iothread_perform(std::function<void()> &&func) {
|
||||
iothread_perform_impl(std::move(func));
|
||||
auto callback = new iothread_callback_t{std::bind([=] {
|
||||
func();
|
||||
return nullptr;
|
||||
}),
|
||||
nullptr};
|
||||
|
||||
iothread_perform((const uint8_t *)&iothread_trampoline, (const uint8_t *)callback);
|
||||
}
|
||||
|
||||
/// Variant of iothread_perform that disrespects the thread limit.
|
||||
/// It does its best to spawn a new thread if all other threads are occupied.
|
||||
/// This is for cases where deferring a new thread might lead to deadlock.
|
||||
inline void iothread_perform_cantwait(std::function<void()> &&func) {
|
||||
iothread_perform_impl(std::move(func), true);
|
||||
auto callback = new iothread_callback_t{std::bind([=] {
|
||||
func();
|
||||
return nullptr;
|
||||
}),
|
||||
nullptr};
|
||||
|
||||
iothread_perform_cantwait((const uint8_t *)&iothread_trampoline, (const uint8_t *)callback);
|
||||
}
|
||||
|
||||
/// Creates a pthread, manipulating the signal mask so that the thread receives no signals.
|
||||
/// The thread is detached.
|
||||
/// The pthread runs \p func.
|
||||
/// \returns true on success, false on failure.
|
||||
bool make_detached_pthread(void *(*func)(void *), void *param);
|
||||
bool make_detached_pthread(std::function<void()> &&func);
|
||||
inline uint64_t debounce_perform(const debounce_t &debouncer, const std::function<void()> &func) {
|
||||
auto callback = new iothread_callback_t{std::bind([=] {
|
||||
func();
|
||||
return nullptr;
|
||||
}),
|
||||
nullptr};
|
||||
|
||||
/// \returns a thread ID for this thread.
|
||||
/// Thread IDs are never repeated.
|
||||
uint64_t thread_id();
|
||||
|
||||
/// A Debounce is a simple class which executes one function in a background thread,
|
||||
/// while enqueuing at most one more. New execution requests overwrite the enqueued one.
|
||||
/// It has an optional timeout; if a handler does not finish within the timeout, then
|
||||
/// a new thread is spawned.
|
||||
class debounce_t {
|
||||
public:
|
||||
/// Enqueue \p handler to be performed on a background thread, and \p completion (if any) to be
|
||||
/// performed on the main thread. If a function is already enqueued, this overwrites it; that
|
||||
/// function will not execute.
|
||||
/// If the function executes, then \p completion will be invoked on the main thread, with the
|
||||
/// result of the handler.
|
||||
/// The result is a token which is only of interest to the tests.
|
||||
template <typename Handler, typename Completion>
|
||||
uint64_t perform(const Handler &handler, const Completion &completion) {
|
||||
// Make a trampoline function which calls the handler, puts the result into a shared
|
||||
// pointer, and then enqueues a completion.
|
||||
auto trampoline = [=] {
|
||||
using result_type_t = decltype(handler());
|
||||
auto result = std::make_shared<result_type_t>(handler());
|
||||
enqueue_main_thread_result([=] { completion(std::move(*result)); });
|
||||
};
|
||||
return perform(std::move(trampoline));
|
||||
return debouncer.perform((const uint8_t *)&iothread_trampoline, (const uint8_t *)callback);
|
||||
}
|
||||
|
||||
/// One-argument form with no completion.
|
||||
/// The result is a token which is only of interest to the tests.
|
||||
uint64_t perform(std::function<void()> handler);
|
||||
template <typename R>
|
||||
inline void debounce_perform_with_completion(const debounce_t &debouncer, std::function<R()> &&func,
|
||||
std::function<void(R)> &&completion) {
|
||||
auto callback1 = new iothread_callback_t{[=](const void *) {
|
||||
auto *result = new R(func());
|
||||
return (void *)result;
|
||||
},
|
||||
nullptr};
|
||||
|
||||
explicit debounce_t(long timeout_msec = 0);
|
||||
~debounce_t();
|
||||
|
||||
private:
|
||||
/// Helper to enqueue a function to run on the main thread.
|
||||
static void enqueue_main_thread_result(std::function<void()> func);
|
||||
|
||||
const long timeout_msec_;
|
||||
struct impl_t;
|
||||
const std::shared_ptr<impl_t> impl_;
|
||||
auto callback2 = new iothread_callback_t{
|
||||
([=](const void *r) {
|
||||
const R *result = (const R *)r;
|
||||
completion(*result);
|
||||
delete result;
|
||||
return nullptr;
|
||||
}),
|
||||
nullptr,
|
||||
};
|
||||
|
||||
debouncer.perform_with_completion(
|
||||
(const uint8_t *)&iothread_trampoline, (const uint8_t *)callback1,
|
||||
(const uint8_t *)&iothread_trampoline2, (const uint8_t *)callback2);
|
||||
}
|
||||
|
||||
template <typename R>
|
||||
inline void debounce_perform_with_completion(const debounce_t &debouncer, std::function<R()> &&func,
|
||||
std::function<void(const R &)> &&completion) {
|
||||
auto callback1 = new iothread_callback_t{[=](const void *) {
|
||||
auto *result = new R(func());
|
||||
return (void *)result;
|
||||
},
|
||||
nullptr};
|
||||
|
||||
auto callback2 = new iothread_callback_t{
|
||||
([=](const void *r) {
|
||||
const R *result = (const R *)r;
|
||||
completion(*result);
|
||||
delete result;
|
||||
return nullptr;
|
||||
}),
|
||||
nullptr,
|
||||
};
|
||||
|
||||
debouncer.perform_with_completion(
|
||||
(const uint8_t *)&iothread_trampoline, (const uint8_t *)callback1,
|
||||
(const uint8_t *)&iothread_trampoline2, (const uint8_t *)callback2);
|
||||
}
|
||||
|
||||
inline bool make_detached_pthread(const std::function<void()> &func) {
|
||||
auto callback = new iothread_callback_t{
|
||||
[=](const void *) {
|
||||
func();
|
||||
return nullptr;
|
||||
},
|
||||
nullptr,
|
||||
};
|
||||
|
||||
return make_detached_pthread((const uint8_t *)&iothread_trampoline, (const uint8_t *)callback);
|
||||
}
|
||||
|
||||
#endif
|
||||
#endif
|
||||
|
|
|
|||
|
|
@ -29,6 +29,7 @@
|
|||
#include "flog.h"
|
||||
#include "maybe.h"
|
||||
#include "output.h"
|
||||
#include "threads.rs.h"
|
||||
#include "wcstringutil.h"
|
||||
#include "wutil.h" // IWYU pragma: keep
|
||||
|
||||
|
|
|
|||
|
|
@ -30,6 +30,7 @@
|
|||
#include "parse_execution.h"
|
||||
#include "proc.h"
|
||||
#include "signals.h"
|
||||
#include "threads.rs.h"
|
||||
#include "wutil.h" // IWYU pragma: keep
|
||||
|
||||
class io_chain_t;
|
||||
|
|
|
|||
|
|
@ -177,19 +177,19 @@ static constexpr long kHighlightTimeoutForExecutionMs = 250;
|
|||
/// These are deliberately leaked to avoid shutdown dtor registration.
|
||||
static debounce_t &debounce_autosuggestions() {
|
||||
const long kAutosuggestTimeoutMs = 500;
|
||||
static auto res = new debounce_t(kAutosuggestTimeoutMs);
|
||||
static auto res = new_debounce_t(kAutosuggestTimeoutMs);
|
||||
return *res;
|
||||
}
|
||||
|
||||
static debounce_t &debounce_highlighting() {
|
||||
const long kHighlightTimeoutMs = 500;
|
||||
static auto res = new debounce_t(kHighlightTimeoutMs);
|
||||
static auto res = new_debounce_t(kHighlightTimeoutMs);
|
||||
return *res;
|
||||
}
|
||||
|
||||
static debounce_t &debounce_history_pager() {
|
||||
const long kHistoryPagerTimeoutMs = 500;
|
||||
static auto res = new debounce_t(kHistoryPagerTimeoutMs);
|
||||
static auto res = new_debounce_t(kHistoryPagerTimeoutMs);
|
||||
return *res;
|
||||
}
|
||||
|
||||
|
|
@ -1333,8 +1333,10 @@ void reader_data_t::fill_history_pager(bool new_search, history_search_direction
|
|||
}
|
||||
const wcstring &search_term = pager.search_field_line.text();
|
||||
auto shared_this = this->shared_from_this();
|
||||
debounce_history_pager().perform(
|
||||
[=]() { return history_pager_search(shared_this->history, direction, index, search_term); },
|
||||
std::function<history_pager_result_t()> func = [=]() {
|
||||
return history_pager_search(shared_this->history, direction, index, search_term);
|
||||
};
|
||||
std::function<void(const history_pager_result_t &)> completion =
|
||||
[=](const history_pager_result_t &result) {
|
||||
if (search_term != shared_this->pager.search_field_line.text())
|
||||
return; // Stale request.
|
||||
|
|
@ -1356,7 +1358,9 @@ void reader_data_t::fill_history_pager(bool new_search, history_search_direction
|
|||
shared_this->select_completion_in_direction(selection_motion_t::next, true);
|
||||
shared_this->super_highlight_me_plenty();
|
||||
shared_this->layout_and_repaint(L"history-pager");
|
||||
});
|
||||
};
|
||||
auto &debouncer = debounce_history_pager();
|
||||
debounce_perform_with_completion(debouncer, std::move(func), std::move(completion));
|
||||
}
|
||||
|
||||
void reader_data_t::pager_selection_changed() {
|
||||
|
|
@ -2107,11 +2111,14 @@ void reader_data_t::update_autosuggestion() {
|
|||
// Clear the autosuggestion and kick it off in the background.
|
||||
FLOG(reader_render, L"Autosuggesting");
|
||||
autosuggestion.clear();
|
||||
auto performer = get_autosuggestion_performer(parser(), el.text(), el.position(), history);
|
||||
std::function<autosuggestion_t()> performer =
|
||||
get_autosuggestion_performer(parser(), el.text(), el.position(), history);
|
||||
auto shared_this = this->shared_from_this();
|
||||
debounce_autosuggestions().perform(performer, [shared_this](autosuggestion_t result) {
|
||||
std::function<void(autosuggestion_t)> completion = [shared_this](autosuggestion_t result) {
|
||||
shared_this->autosuggest_completed(std::move(result));
|
||||
});
|
||||
};
|
||||
debounce_perform_with_completion(debounce_autosuggestions(), std::move(performer),
|
||||
std::move(completion));
|
||||
}
|
||||
|
||||
// Accept any autosuggestion by replacing the command line with it. If full is true, take the whole
|
||||
|
|
@ -2827,11 +2834,14 @@ void reader_data_t::super_highlight_me_plenty() {
|
|||
in_flight_highlight_request = el->text();
|
||||
|
||||
FLOG(reader_render, L"Highlighting");
|
||||
auto highlight_performer = get_highlight_performer(parser(), *el, true /* io_ok */);
|
||||
std::function<highlight_result_t()> highlight_performer =
|
||||
get_highlight_performer(parser(), *el, true /* io_ok */);
|
||||
auto shared_this = this->shared_from_this();
|
||||
debounce_highlighting().perform(highlight_performer, [shared_this](highlight_result_t result) {
|
||||
std::function<void(highlight_result_t)> completion = [shared_this](highlight_result_t result) {
|
||||
shared_this->highlight_complete(std::move(result));
|
||||
});
|
||||
};
|
||||
debounce_perform_with_completion(debounce_highlighting(), std::move(highlight_performer),
|
||||
std::move(completion));
|
||||
}
|
||||
|
||||
void reader_data_t::finish_highlighting_before_exec() {
|
||||
|
|
|
|||
Loading…
Reference in a new issue