[PR] Improve os2threads (PR #24202)

PR #24202 opened by KO Myung-Hun (komh)
URL: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/24202
Patch URL: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/24202.patch

Hi/2.

This PR improves os2threads.

1. Enable os2threads with atomic support
2. Add pthread_mutex_trylock()

Review, please...


>From 2f0a4e24f10df7c277ace2c23c13aa8db2f0132a Mon Sep 17 00:00:00 2001
From: KO Myung-Hun <[email protected]>
Date: Mon, 27 Jul 2026 23:40:38 +0900
Subject: [PATCH 1/2] configure: enable os2threads with atomics support

---
 configure | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/configure b/configure
index f2896b81c7..fb0f92f988 100755
--- a/configure
+++ b/configure
@@ -2267,6 +2267,7 @@ THREADS_LIST="
 
 ATOMICS_LIST="
     atomics_win32
+    atomics_os2
 "
 
 AUTODETECT_LIBS="
@@ -3036,8 +3037,10 @@ valgrind_backtrace_deps="valgrind_valgrind_h"
 
 # threading support
 atomics_win32_if="MemoryBarrier"
+atomics_os2_if="stdatomic"
 atomics_native_if_any="$ATOMICS_LIST"
 w32threads_deps="atomics_native"
+os2threads_deps="atomics_native"
 threads_if_any="$THREADS_LIST"
 
 # subsystems
-- 
2.52.0


>From 44c9fc05ca792d044adffef6946695d8fd6fa129 Mon Sep 17 00:00:00 2001
From: KO Myung-Hun <[email protected]>
Date: Tue, 18 Aug 2026 22:57:20 +0900
Subject: [PATCH 2/2] compat/os2threads.h: add pthread_mutex_trylock

---
 compat/os2threads.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/compat/os2threads.h b/compat/os2threads.h
index a061eaa63d..7a8e391f65 100644
--- a/compat/os2threads.h
+++ b/compat/os2threads.h
@@ -123,6 +123,12 @@ static av_always_inline int pthread_mutex_lock(pthread_mutex_t *mutex)
     return 0;
 }
 
+static av_always_inline int pthread_mutex_trylock(pthread_mutex_t *mutex)
+{
+    return _fmutex_request(mutex, _FMR_NOWAIT) == ERROR_MUTEX_OWNED ?
+                EBUSY : 0;
+}
+
 static av_always_inline int pthread_mutex_unlock(pthread_mutex_t *mutex)
 {
     _fmutex_release(mutex);
-- 
2.52.0

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