scrcpy/app/src/util/thread.c
Romain Vimont 32e692d5d2 Replace delay by deadline in timedwait()
The function sc_cond_timedwait() accepted a parameter representing the
max duration to wait, because it internally uses SDL_CondWaitTimeout().

Instead, accept a deadline, to be consistent with
pthread_cond_timedwait().
2021-07-14 14:22:32 +02:00

171 lines
3.5 KiB
C

#include "thread.h"
#include <assert.h>
#include <SDL2/SDL_thread.h>
#include "log.h"
bool
sc_thread_create(sc_thread *thread, sc_thread_fn fn, const char *name,
void *userdata) {
SDL_Thread *sdl_thread = SDL_CreateThread(fn, name, userdata);
if (!sdl_thread) {
return false;
}
thread->thread = sdl_thread;
return true;
}
void
sc_thread_join(sc_thread *thread, int *status) {
SDL_WaitThread(thread->thread, status);
}
bool
sc_mutex_init(sc_mutex *mutex) {
SDL_mutex *sdl_mutex = SDL_CreateMutex();
if (!sdl_mutex) {
return false;
}
mutex->mutex = sdl_mutex;
#ifndef NDEBUG
atomic_init(&mutex->locker, 0);
#endif
return true;
}
void
sc_mutex_destroy(sc_mutex *mutex) {
SDL_DestroyMutex(mutex->mutex);
}
void
sc_mutex_lock(sc_mutex *mutex) {
// SDL mutexes are recursive, but we don't want to use recursive mutexes
assert(!sc_mutex_held(mutex));
int r = SDL_LockMutex(mutex->mutex);
#ifndef NDEBUG
if (r) {
LOGC("Could not lock mutex: %s", SDL_GetError());
abort();
}
atomic_store_explicit(&mutex->locker, sc_thread_get_id(),
memory_order_relaxed);
#else
(void) r;
#endif
}
void
sc_mutex_unlock(sc_mutex *mutex) {
#ifndef NDEBUG
assert(sc_mutex_held(mutex));
atomic_store_explicit(&mutex->locker, 0, memory_order_relaxed);
#endif
int r = SDL_UnlockMutex(mutex->mutex);
#ifndef NDEBUG
if (r) {
LOGC("Could not lock mutex: %s", SDL_GetError());
abort();
}
#else
(void) r;
#endif
}
sc_thread_id
sc_thread_get_id(void) {
return SDL_ThreadID();
}
#ifndef NDEBUG
bool
sc_mutex_held(struct sc_mutex *mutex) {
sc_thread_id locker_id =
atomic_load_explicit(&mutex->locker, memory_order_relaxed);
return locker_id == sc_thread_get_id();
}
#endif
bool
sc_cond_init(sc_cond *cond) {
SDL_cond *sdl_cond = SDL_CreateCond();
if (!sdl_cond) {
return false;
}
cond->cond = sdl_cond;
return true;
}
void
sc_cond_destroy(sc_cond *cond) {
SDL_DestroyCond(cond->cond);
}
void
sc_cond_wait(sc_cond *cond, sc_mutex *mutex) {
int r = SDL_CondWait(cond->cond, mutex->mutex);
#ifndef NDEBUG
if (r) {
LOGC("Could not wait on condition: %s", SDL_GetError());
abort();
}
atomic_store_explicit(&mutex->locker, sc_thread_get_id(),
memory_order_relaxed);
#else
(void) r;
#endif
}
bool
sc_cond_timedwait(sc_cond *cond, sc_mutex *mutex, sc_tick deadline) {
sc_tick now = sc_tick_now();
if (deadline <= now) {
return false; // timeout
}
uint32_t ms = SC_TICK_TO_MS(deadline - now);
int r = SDL_CondWaitTimeout(cond->cond, mutex->mutex, ms);
#ifndef NDEBUG
if (r < 0) {
LOGC("Could not wait on condition with timeout: %s", SDL_GetError());
abort();
}
atomic_store_explicit(&mutex->locker, sc_thread_get_id(),
memory_order_relaxed);
#endif
assert(r == 0 || r == SDL_MUTEX_TIMEDOUT);
return r == 0;
}
void
sc_cond_signal(sc_cond *cond) {
int r = SDL_CondSignal(cond->cond);
#ifndef NDEBUG
if (r) {
LOGC("Could not signal a condition: %s", SDL_GetError());
abort();
}
#else
(void) r;
#endif
}
void
sc_cond_broadcast(sc_cond *cond) {
int r = SDL_CondBroadcast(cond->cond);
#ifndef NDEBUG
if (r) {
LOGC("Could not broadcast a condition: %s", SDL_GetError());
abort();
}
#else
(void) r;
#endif
}