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internal locks: new owner of contended lock must set waiters flag
[musl]
/
src
/
thread
/
__lock.c
diff --git
a/src/thread/__lock.c
b/src/thread/__lock.c
index
d173409
..
5ba5dc5
100644
(file)
--- a/
src/thread/__lock.c
+++ b/
src/thread/__lock.c
@@
-4,7
+4,7
@@
void __lock_2(volatile int *l)
{
if (!__syscall(SYS_futex, l, FUTEX_LOCK_PI, 0, 0))
return;
{
if (!__syscall(SYS_futex, l, FUTEX_LOCK_PI, 0, 0))
return;
- int old, tid = __pthread_self()->tid;
+ int old, tid = __pthread_self()->tid
|INT_MIN
;
while ((old = a_cas(l, 0, tid))) {
a_cas(l, old, old|INT_MIN);
__syscall(SYS_futex, l, FUTEX_WAIT, old|INT_MIN, 0);
while ((old = a_cas(l, 0, tid))) {
a_cas(l, old, old|INT_MIN);
__syscall(SYS_futex, l, FUTEX_WAIT, old|INT_MIN, 0);