[FFmpeg-cvslog] avutil/executor: Fix missing check before using mutex

[Zhao Zhili]

ffmpeg | branch: master | Zhao Zhili <zhilizhao at tencent.com> | Sun Jun 30 18:45:00 2024 +0800| [54f9469fa173394ef3a19d8c6e700bca0b8fde81] | committer: Nuo Mi

avutil/executor: Fix missing check before using mutex

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=54f9469fa173394ef3a19d8c6e700bca0b8fde81
---

 libavutil/executor.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/libavutil/executor.c b/libavutil/executor.c
index fb20104b58..89058fab2f 100644
--- a/libavutil/executor.c
+++ b/libavutil/executor.c
@@ -194,14 +194,17 @@ void av_executor_execute(AVExecutor *e, AVTask *t)
     AVTaskCallbacks *cb = &e->cb;
     AVTask **prev;
 
-    ff_mutex_lock(&e->lock);
+    if (e->thread_count)
+        ff_mutex_lock(&e->lock);
     if (t) {
         for (prev = &e->tasks; *prev && cb->priority_higher(*prev, t); prev = &(*prev)->next)
             /* nothing */;
         add_task(prev, t);
     }
-    ff_cond_signal(&e->cond);
-    ff_mutex_unlock(&e->lock);
+    if (e->thread_count) {
+        ff_cond_signal(&e->cond);
+        ff_mutex_unlock(&e->lock);
+    }
 
     if (!e->thread_count || !HAVE_THREADS) {
         // We are running in a single-threaded environment, so we must handle all tasks ourselves