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Mild refactoring of how received signals are stored

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No functional change here, just some cleanup.
This commit is contained in:
ridiculousfish 2022-05-08 15:49:19 -07:00
parent ce2064d8b6
commit 31567cea63
1 changed files with 7 additions and 11 deletions
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18
src/event.cpp
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@ -33,7 +33,7 @@ class pending_signals_t {
std::atomic<uint32_t> counter_{0};
/// List of pending signals.
std::array<std::atomic<bool>, SIGNAL_COUNT> received_{};
std::array<relaxed_atomic_bool_t, SIGNAL_COUNT> received_{};
/// The last counter visible in acquire_pending().
/// This is not accessed from a signal handler.
@ -52,7 +52,7 @@ class pending_signals_t {
void mark(int which) {
if (which >= 0 && static_cast<size_t>(which) < received_.size()) {
// Must mark our received first, then pending.
received_[which].store(true, std::memory_order_relaxed);
received_[which] = true;
uint32_t count = counter_.load(std::memory_order_relaxed);
counter_.store(1 + count, std::memory_order_release);
}
@ -68,18 +68,14 @@ class pending_signals_t {
return {};
}
// The signal count has changed. Store the new counter and fetch all the signals that are
// set.
// The signal count has changed. Store the new counter and fetch all set signals.
*current = count;
std::bitset<SIGNAL_COUNT> result{};
uint32_t bit = 0;
for (auto &signal : received_) {
bool val = signal.load(std::memory_order_relaxed);
if (val) {
result.set(bit);
signal.store(false, std::memory_order_relaxed);
for (size_t i = 0; i < NSIG; i++) {
if (received_[i]) {
result.set(i);
received_[i] = false;
}
bit++;
}
return result;
}