fix wide printf forms ignoring width for %lc format specifier

[musl] / src / thread / sem_post.c

diff --git a/src/thread/sem_post.c b/src/thread/sem_post.c
index 148ab78..5c2517f 100644 (file)
--- a/src/thread/sem_post.c
+++ b/src/thread/sem_post.c
@@ -1,13 +1,21 @@
 #include <semaphore.h>
+#include <limits.h>
 #include "pthread_impl.h"
 
 int sem_post(sem_t *sem)
 {
-       int val, waiters;
+       int val, new, waiters, priv = sem->__val[2];
        do {
                val = sem->__val[0];
                waiters = sem->__val[1];
-       } while (a_cas(sem->__val, val, val+1+(val<0)) != val);
-       if (val<0 || waiters) __wake(sem->__val, 1, 0);
+               if ((val & SEM_VALUE_MAX) == SEM_VALUE_MAX) {
+                       errno = EOVERFLOW;
+                       return -1;
+               }
+               new = val + 1;
+               if (waiters <= 1)
+                       new &= ~0x80000000;
+       } while (a_cas(sem->__val, val, new) != val);
+       if (val<0) __wake(sem->__val, waiters>1 ? 1 : -1, priv);
        return 0;
 }