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frame_thread_encoder: make 'exit' member atomic.

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Should fix the following tsan warning:

WARNING: ThreadSanitizer: data race (pid=19806)
  Read of size 4 at 0x7b84000012f0 by thread T9:
    #0 worker src/libavcodec/frame_thread_encoder.c:66 (ffmpeg+0x0000007f349e)
[..]
  Previous write of size 4 at 0x7b84000012f0 by main thread (mutexes: write M1395):
    #0 ff_frame_thread_encoder_free src/libavcodec/frame_thread_encoder.c:239 (ffmpeg+0x0000007f379e)
[..]
This commit is contained in:
Ronald S. Bultje 2017-09-11 09:58:47 -04:00
parent 549ef6ef9a
commit 183216b218
1 changed files with 8 additions and 5 deletions
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13
libavcodec/frame_thread_encoder.c
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@ -18,6 +18,8 @@
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/ */
#include <stdatomic.h>
#include "frame_thread_encoder.h" #include "frame_thread_encoder.h"
#include "libavutil/fifo.h" #include "libavutil/fifo.h"
@ -55,7 +57,7 @@ typedef struct{
unsigned finished_task_index; unsigned finished_task_index;
pthread_t worker[MAX_THREADS]; pthread_t worker[MAX_THREADS];
int exit; atomic_int exit;
} ThreadContext; } ThreadContext;
static void * attribute_align_arg worker(void *v){ static void * attribute_align_arg worker(void *v){
@ -63,7 +65,7 @@ static void * attribute_align_arg worker(void *v){
ThreadContext *c = avctx->internal->frame_thread_encoder; ThreadContext *c = avctx->internal->frame_thread_encoder;
AVPacket *pkt = NULL; AVPacket *pkt = NULL;
while(!c->exit){ while (!atomic_load(&c->exit)) {
int got_packet, ret; int got_packet, ret;
AVFrame *frame; AVFrame *frame;
Task task; Task task;
@ -73,8 +75,8 @@ static void * attribute_align_arg worker(void *v){
av_init_packet(pkt); av_init_packet(pkt);
pthread_mutex_lock(&c->task_fifo_mutex); pthread_mutex_lock(&c->task_fifo_mutex);
while (av_fifo_size(c->task_fifo) <= 0 || c->exit) { while (av_fifo_size(c->task_fifo) <= 0 || atomic_load(&c->exit)) {
if(c->exit){ if (atomic_load(&c->exit)) {
pthread_mutex_unlock(&c->task_fifo_mutex); pthread_mutex_unlock(&c->task_fifo_mutex);
goto end; goto end;
} }
@ -187,6 +189,7 @@ int ff_frame_thread_encoder_init(AVCodecContext *avctx, AVDictionary *options){
pthread_mutex_init(&c->buffer_mutex, NULL); pthread_mutex_init(&c->buffer_mutex, NULL);
pthread_cond_init(&c->task_fifo_cond, NULL); pthread_cond_init(&c->task_fifo_cond, NULL);
pthread_cond_init(&c->finished_task_cond, NULL); pthread_cond_init(&c->finished_task_cond, NULL);
atomic_init(&c->exit, 0);
for(i=0; i<avctx->thread_count ; i++){ for(i=0; i<avctx->thread_count ; i++){
AVDictionary *tmp = NULL; AVDictionary *tmp = NULL;
@ -236,7 +239,7 @@ void ff_frame_thread_encoder_free(AVCodecContext *avctx){
ThreadContext *c= avctx->internal->frame_thread_encoder; ThreadContext *c= avctx->internal->frame_thread_encoder;
pthread_mutex_lock(&c->task_fifo_mutex); pthread_mutex_lock(&c->task_fifo_mutex);
c->exit = 1; atomic_store(&c->exit, 1);
pthread_cond_broadcast(&c->task_fifo_cond); pthread_cond_broadcast(&c->task_fifo_cond);
pthread_mutex_unlock(&c->task_fifo_mutex); pthread_mutex_unlock(&c->task_fifo_mutex);