On Wed, 1 Oct 2025, LIU Hao wrote:
在 2025-10-1 20:28, Martin Storsjö 写道:
The previous form could cause the inner loop with YieldProcessor to
only read a cached stale value. Therefore, just iterate
YieldProcessor with InterlockedExchangePointer for attempting to
update the value.
Signed-off-by: Martin Storsjö <[email protected]>
---
mingw-w64-libraries/winpthreads/src/spinlock.c | 4 +---
1 file changed, 1 insertion(+), 3 deletions(-)
diff --git a/mingw-w64-libraries/winpthreads/src/spinlock.c
b/mingw-w64-libraries/winpthreads/src/spinlock.c
index 6e094d5ff..5dca17502 100644
--- a/mingw-w64-libraries/winpthreads/src/spinlock.c
+++ b/mingw-w64-libraries/winpthreads/src/spinlock.c
@@ -59,9 +59,7 @@ pthread_spin_lock (pthread_spinlock_t *lock)
{
volatile spinlock_word_t *lk = (volatile spinlock_word_t *)lock;
while (unlikely(InterlockedExchangePointer((PVOID volatile *)lk, 0) ==
0))
- do {
- YieldProcessor();
- } while (*lk == 0);
+ YieldProcessor();
return 0;
}
LGTM.
Thanks, pushed.
// Martin
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