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udp: use pthread_cancel instead of a shared flag.

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It allows to exit the thread immediately instead of waiting
for select to timeout (one second in the current code).
This commit is contained in:
Nicolas George 2012-03-15 13:03:38 +01:00
parent 4246032216
commit aa1297882f
1 changed files with 11 additions and 3 deletions
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14
libavformat/udp.c
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@ -73,7 +73,6 @@ typedef struct {
pthread_mutex_t mutex;
pthread_cond_t cond;
int thread_started;
volatile int exit_thread;
#endif
uint8_t tmp[UDP_MAX_PKT_SIZE+4];
int remaining_in_dg;
@ -330,8 +329,10 @@ static void *circular_buffer_task( void *_URLContext)
UDPContext *s = h->priv_data;
fd_set rfds;
struct timeval tv;
int old_cancelstate;
while(!s->exit_thread) {
pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &old_cancelstate);
while(1) {
int left;
int ret;
int len;
@ -340,7 +341,9 @@ static void *circular_buffer_task( void *_URLContext)
FD_SET(s->udp_fd, &rfds);
tv.tv_sec = 1;
tv.tv_usec = 0;
pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, &old_cancelstate);
ret = select(s->udp_fd + 1, &rfds, NULL, NULL, &tv);
pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &old_cancelstate);
if (ret < 0) {
if (ff_neterrno() == AVERROR(EINTR))
continue;
@ -355,7 +358,12 @@ static void *circular_buffer_task( void *_URLContext)
/* Whats the minimum we can read so that we dont comletely fill the buffer */
left = av_fifo_space(s->fifo);
/* Blocking operations are always cancellation points;
see "General Information" / "Thread Cancelation Overview"
in Single Unix. */
pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, &old_cancelstate);
len = recv(s->udp_fd, s->tmp+4, sizeof(s->tmp)-4, 0);
pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &old_cancelstate);
if (len < 0) {
if (ff_neterrno() != AVERROR(EAGAIN) && ff_neterrno() != AVERROR(EINTR)) {
s->circular_buffer_error = AVERROR(EIO);
@ -669,7 +677,7 @@ static int udp_close(URLContext *h)
av_fifo_free(s->fifo);
#if HAVE_PTHREADS
if (s->thread_started) {
s->exit_thread = 1;
pthread_cancel(s->circular_buffer_thread);
ret = pthread_join(s->circular_buffer_thread, NULL);
if (ret != 0)
av_log(h, AV_LOG_ERROR, "pthread_join(): %s\n", strerror(ret));