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Code Issues Releases Activity

pthread: mark lockless thread synchronization variables as volatile

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No speed difference was meassureable

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2012-07-17 16:10:49 +02:00
parent 9e1508f1e7
commit 7c71f8e0ec
1 changed files with 9 additions and 8 deletions
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17
libavcodec/pthread.c
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@ -129,8 +129,8 @@ typedef struct PerThreadContext {
/**
* Array of progress values used by ff_thread_get_buffer().
*/
int progress[MAX_BUFFERS][2];
uint8_t progress_used[MAX_BUFFERS];
volatile int progress[MAX_BUFFERS][2];
volatile uint8_t progress_used[MAX_BUFFERS];
AVFrame *requested_frame; ///< AVFrame the codec passed to get_buffer()
} PerThreadContext;
@ -500,7 +500,7 @@ static int update_context_from_user(AVCodecContext *dst, AVCodecContext *src)
static void free_progress(AVFrame *f)
{
PerThreadContext *p = f->owner->thread_opaque;
int *progress = f->thread_opaque;
volatile int *progress = f->thread_opaque;
p->progress_used[(progress - p->progress[0]) / 2] = 0;
}
@ -666,7 +666,7 @@ int ff_thread_decode_frame(AVCodecContext *avctx,
void ff_thread_report_progress(AVFrame *f, int n, int field)
{
PerThreadContext *p;
int *progress = f->thread_opaque;
volatile int *progress = f->thread_opaque;
if (!progress || progress[field] >= n) return;
@ -684,7 +684,7 @@ void ff_thread_report_progress(AVFrame *f, int n, int field)
void ff_thread_await_progress(AVFrame *f, int n, int field)
{
PerThreadContext *p;
int *progress = f->thread_opaque;
volatile int *progress = f->thread_opaque;
if (!progress || progress[field] >= n) return;
@ -911,7 +911,7 @@ void ff_thread_flush(AVCodecContext *avctx)
}
}
static int *allocate_progress(PerThreadContext *p)
static volatile int *allocate_progress(PerThreadContext *p)
{
int i;
@ -942,7 +942,8 @@ int ff_thread_can_start_frame(AVCodecContext *avctx)
int ff_thread_get_buffer(AVCodecContext *avctx, AVFrame *f)
{
PerThreadContext *p = avctx->thread_opaque;
int *progress, err;
int err;
volatile int *progress;
f->owner = avctx;
@ -961,7 +962,7 @@ int ff_thread_get_buffer(AVCodecContext *avctx, AVFrame *f)
}
pthread_mutex_lock(&p->parent->buffer_mutex);
f->thread_opaque = progress = allocate_progress(p);
f->thread_opaque = (int*)(progress = allocate_progress(p));
if (!progress) {
pthread_mutex_unlock(&p->parent->buffer_mutex);