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[client] reworked frame timing waits for better responsiveness

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This commit is contained in:
Geoffrey McRae
2020-10-26 18:09:45 +11:00
parent e02ccd7c6f
commit a70858aea0
2 changed files with 53 additions and 89 deletions
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86
common/src/platform/linux/event.c
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@@ -32,7 +32,7 @@ struct LGEvent
{
pthread_mutex_t mutex;
pthread_cond_t cond;
uint32_t flag;
atomic_uint count;
bool autoReset;
};
@@ -52,7 +52,18 @@ LGEvent * lgCreateEvent(bool autoReset, unsigned int msSpinTime)
return NULL;
}
if (pthread_cond_init(&handle->cond, NULL) != 0)
pthread_condattr_t cattr;
pthread_condattr_init(&cattr);
if (pthread_condattr_setclock(&cattr, CLOCK_MONOTONIC) != 0)
{
DEBUG_ERROR("Failed to set the condition clock to realtime");
pthread_mutex_destroy(&handle->mutex);
free(handle);
return NULL;
}
if (pthread_cond_init(&handle->cond, &cattr) != 0)
{
pthread_mutex_destroy(&handle->mutex);
free(handle);
@@ -76,16 +87,17 @@ bool lgWaitEventAbs(LGEvent * handle, struct timespec * ts)
{
assert(handle);
if (pthread_mutex_lock(&handle->mutex) != 0)
{
DEBUG_ERROR("Failed to lock the mutex");
return false;
}
bool ret = true;
int res;
while(ret && !atomic_load(&handle->flag))
while(ret && atomic_load(&handle->count) == 0)
{
if (pthread_mutex_lock(&handle->mutex) != 0)
{
DEBUG_ERROR("Failed to lock the mutex");
return false;
}
if (!ts)
{
if ((res = pthread_cond_wait(&handle->cond, &handle->mutex)) != 0)
@@ -111,16 +123,16 @@ bool lgWaitEventAbs(LGEvent * handle, struct timespec * ts)
break;
}
}
if (pthread_mutex_unlock(&handle->mutex) != 0)
{
DEBUG_ERROR("Failed to unlock the mutex");
return false;
}
}
if (handle->autoReset)
atomic_store(&handle->flag, 0);
if (pthread_mutex_unlock(&handle->mutex) != 0)
{
DEBUG_ERROR("Failed to unlock the mutex");
return false;
}
if (ret && handle->autoReset)
atomic_fetch_sub(&handle->count, 1);
return ret;
}
@@ -131,11 +143,11 @@ bool lgWaitEventNS(LGEvent * handle, unsigned int timeout)
return lgWaitEventAbs(handle, NULL);
struct timespec ts;
clock_gettime(CLOCK_REALTIME, &ts);
clock_gettime(CLOCK_MONOTONIC, &ts);
uint64_t nsec = ts.tv_nsec + timeout;
if(nsec > 1e9)
if(nsec > 1000000000UL)
{
ts.tv_nsec = nsec - 1e9;
ts.tv_nsec = nsec - 1000000000UL;
++ts.tv_sec;
}
else
@@ -149,26 +161,18 @@ bool lgWaitEvent(LGEvent * handle, unsigned int timeout)
if (timeout == TIMEOUT_INFINITE)
return lgWaitEventAbs(handle, NULL);
return lgWaitEventNS(handle, timeout * 1000000);
return lgWaitEventNS(handle, timeout * 1000000U);
}
bool lgSignalEvent(LGEvent * handle)
{
assert(handle);
if (pthread_mutex_lock(&handle->mutex) != 0)
{
DEBUG_ERROR("Failed to lock the mutex");
return false;
}
const bool signalled = atomic_fetch_add_explicit(&handle->count, 1,
memory_order_acquire) > 0;
atomic_store(&handle->flag, 1);
if (pthread_mutex_unlock(&handle->mutex) != 0)
{
DEBUG_ERROR("Failed to unlock the mutex");
return false;
}
if (signalled)
return true;
if (pthread_cond_broadcast(&handle->cond) != 0)
{
@@ -182,20 +186,6 @@ bool lgSignalEvent(LGEvent * handle)
bool lgResetEvent(LGEvent * handle)
{
assert(handle);
if (pthread_mutex_lock(&handle->mutex) != 0)
{
DEBUG_ERROR("Failed to lock the mutex");
return false;
}
atomic_store(&handle->flag, 0);
if (pthread_mutex_unlock(&handle->mutex) != 0)
{
DEBUG_ERROR("Failed to unlock the mutex");
return false;
}
atomic_store(&handle->count, 0);
return true;
}