unleashed-firmware/core/api-basic/valuemutex.h
Vadim Kaushan bb68fca20b
Implement ValueManager and ValueComposer (#183)
* Fix ValueManager implementation
* Implement ValueComposer
* Add constructor for ValueManager
* Add value-expanders.h to flipper_v2.h set
* Move COPY_COMPOSE body into a .c file
* Add test for ValueManager
* Add destructors for ValueMutex, ValueManager and ValueComposer
* Use destructors in tests
* Move composition logic into perform_compose()
* Add docs for perform_compose()
* Add test for ValueComposer
* Replace atomic_bool with bool as g++ compiler doesn't support C11 atomics
* Add Event type
* Add semaphore support to the local target
* Add test for Event
* Update input records and relevant examples
* Rename Event to AppEvent in the cc1101-workaround example
* Rename Event to AppEvent in the irda example
* Use Event in ValueComposer to wait for update request
* Add perform_compose_internal() function
* fix Event/AppEvent

Co-authored-by: aanper <mail@s3f.ru>
2020-10-26 12:26:15 +03:00

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3.1 KiB
C

#pragma once
#include "flipper.h"
/*
== ValueMutex ==
The most simple concept is ValueMutex.
It is wrapper around mutex and value pointer.
You can take and give mutex to work with value and read and write value.
*/
typedef struct {
void* value;
size_t size;
osMutexId_t mutex;
} ValueMutex;
/*
Creates ValueMutex.
*/
bool init_mutex(ValueMutex* valuemutex, void* value, size_t size);
/*
Free resources allocated by `init_mutex`.
This function doesn't free the memory occupied by `ValueMutex` itself.
*/
bool delete_mutex(ValueMutex* valuemutex);
/*
Call for work with data stored in mutex.
Returns pointer to data if success, NULL otherwise.
*/
void* acquire_mutex(ValueMutex* valuemutex, uint32_t timeout);
/*
Helper: infinitly wait for mutex
*/
static inline void* acquire_mutex_block(ValueMutex* valuemutex) {
return acquire_mutex(valuemutex, osWaitForever);
}
/*
Release mutex after end of work with data.
Call `release_mutex` and pass ValueData instance and pointer to data.
*/
bool release_mutex(ValueMutex* valuemutex, void* value);
/*
Instead of take-access-give sequence you can use `read_mutex` and `write_mutex` functions.
Both functions return true in case of success, false otherwise.
*/
bool read_mutex(ValueMutex* valuemutex, void* data, size_t len, uint32_t timeout);
bool write_mutex(ValueMutex* valuemutex, void* data, size_t len, uint32_t timeout);
inline static bool write_mutex_block(ValueMutex* valuemutex, void* data, size_t len) {
return write_mutex(valuemutex, data, len, osWaitForever);
}
inline static bool read_mutex_block(ValueMutex* valuemutex, void* data, size_t len) {
return read_mutex(valuemutex, data, len, osWaitForever);
}
/*
Usage example
```C
// MANIFEST
// name="example-provider-app"
// stack=128
void provider_app(void* _p) {
// create record with mutex
uint32_t example_value = 0;
ValueMutex example_mutex;
// call `init_mutex`.
if(!init_mutex(&example_mutex, (void*)&example_value, sizeof(uint32_t))) {
printf("critical error\n");
flapp_exit(NULL);
}
if(furi_create("provider/example", (void*)&example_mutex)) {
printf("critical error\n");
flapp_exit(NULL);
}
// we are ready to provide record to other apps
flapp_ready();
// get value and increment it
while(1) {
uint32_t* value = acquire_mutex(&example_mutex, OsWaitForever);
if(value != NULL) {
value++;
}
release_mutex(&example_mutex, value);
osDelay(100);
}
}
// MANIFEST
// name="example-consumer-app"
// stack=128
// require="example-provider-app"
void consumer_app(void* _p) {
// this app run after flapp_ready call in all requirements app
// open mutex value
ValueMutex* counter_mutex = furi_open("provider/example");
if(counter_mutex == NULL) {
printf("critical error\n");
flapp_exit(NULL);
}
// continously read value every 1s
uint32_t counter;
while(1) {
if(read_mutex(counter_mutex, &counter, sizeof(counter), OsWaitForever)) {
printf("counter value: %d\n", counter);
}
osDelay(1000);
}
}
```
*/