fix sem_close unmapping of still-referenced semaphore

[musl] / src / thread / synccall.c

diff --git a/src/thread/synccall.c b/src/thread/synccall.c
index 648a6ad..d58c851 100644 (file)
--- a/src/thread/synccall.c
+++ b/src/thread/synccall.c
@@ -63,7 +63,8 @@ void __synccall(void (*func)(void *), void *ctx)
        sem_init(&target_sem, 0, 0);
        sem_init(&caller_sem, 0, 0);
 
-       if (!libc.threads_minus_1) goto single_threaded;
+       if (!libc.threads_minus_1 || __syscall(SYS_gettid) != self->tid)
+               goto single_threaded;
 
        callback = func;
        context = ctx;