[FFmpeg-cvslog] pthread: track thread existence in a separate variable.

[Cheng Sun]

ffmpeg | branch: master | Cheng Sun <cheng.sun at ymail.com> | Sat Nov 26 16:36:50 2011 -0800| [3f5aa7dfa64c8757e5eef7b1bf870ec754e40f96] | committer: Ronald S. Bultje

pthread: track thread existence in a separate variable.

This fixes a compile error on mingw32 when using p->thread
directly (as if it were a pointer) to track thread existence,
because the type is opaque and may be a non-pointer.

Signed-off-by: Ronald S. Bultje <rsbultje at gmail.com>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=3f5aa7dfa64c8757e5eef7b1bf870ec754e40f96
---

 libavcodec/pthread.c |    6 ++++--
 1 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/libavcodec/pthread.c b/libavcodec/pthread.c
index dae28e6..21e32b5 100644
--- a/libavcodec/pthread.c
+++ b/libavcodec/pthread.c
@@ -70,6 +70,7 @@ typedef struct PerThreadContext {
     struct FrameThreadContext *parent;
 
     pthread_t      thread;
+    int            thread_init;
     pthread_cond_t input_cond;      ///< Used to wait for a new packet from the main thread.
     pthread_cond_t progress_cond;   ///< Used by child threads to wait for progress to change.
     pthread_cond_t output_cond;     ///< Used by the main thread to wait for frames to finish.
@@ -651,7 +652,7 @@ static void frame_thread_free(AVCodecContext *avctx, int thread_count)
         pthread_cond_signal(&p->input_cond);
         pthread_mutex_unlock(&p->mutex);
 
-        if (p->thread)
+        if (p->thread_init)
             pthread_join(p->thread, NULL);
 
         if (codec->close)
@@ -756,7 +757,8 @@ static int frame_thread_init(AVCodecContext *avctx)
 
         if (err) goto error;
 
-        pthread_create(&p->thread, NULL, frame_worker_thread, p);
+        if (!pthread_create(&p->thread, NULL, frame_worker_thread, p))
+            p->thread_init = 1;
     }
 
     return 0;