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Reserve some space in sem_t for the future.

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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
This commit is contained in:
Calin Juravle
2014-05-06 16:24:27 +01:00
parent 9b5ee4aa85
commit 0686d5e26f
1 changed files with 5 additions and 2 deletions
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7
libc/include/semaphore.h
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@@ -33,10 +33,13 @@
__BEGIN_DECLS __BEGIN_DECLS
typedef struct { typedef struct {
volatile unsigned int count; volatile unsigned int count;
#ifdef __LP64__
int __reserved[3];
#endif
} sem_t; } sem_t;
#define SEM_FAILED NULL #define SEM_FAILED NULL
extern int sem_init(sem_t *sem, int pshared, unsigned int value); extern int sem_init(sem_t *sem, int pshared, unsigned int value);