Reserve some space in sem_t for the future.
Reserve 12 more bytes in sem_t to give room for future implementation
improvements. This gets us to a 16 bytes sem_t. Glibc uses 32 bytes (16
actual use + 16 reserved), while OpenBSD has 16 bytes (out of which 4
are for padding).
Bug: 14587103
Bug: 12875898
Change-Id: Id835cc5abf874c651e6b5ad5b8f29c9d6ab08d5a
diff --git a/libc/include/semaphore.h b/libc/include/semaphore.h
index 30e3123..7ae3c3a 100644
--- a/libc/include/semaphore.h
+++ b/libc/include/semaphore.h
@@ -33,10 +33,13 @@
__BEGIN_DECLS
typedef struct {
- volatile unsigned int count;
+ volatile unsigned int count;
+#ifdef __LP64__
+ int __reserved[3];
+#endif
} sem_t;
-#define SEM_FAILED NULL
+#define SEM_FAILED NULL
extern int sem_init(sem_t *sem, int pshared, unsigned int value);