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C90-compatible code for SysV semaphores

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This commit is contained in:
Hallvard Furuseth 2014-12-05 21:00:21 +01:00
parent 1a7243b3f4
commit 03ddbcf37d
1 changed files with 13 additions and 5 deletions
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18
libraries/liblmdb/mdb.c
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@ -270,13 +270,18 @@ typedef struct mdb_mutex {
#define MDB_MUTEX(env, rw) (&(env)->me_##rw##mutex)
#define LOCK_MUTEX0(mutex) mdb_sem_wait(mutex)
#define UNLOCK_MUTEX(mutex) do { struct sembuf sb = { mutex->semnum, 1, SEM_UNDO }; semop(mutex->semid, &sb, 1); } while(0)
#define UNLOCK_MUTEX(mutex) do { \
struct sembuf sb = { 0, 1, SEM_UNDO }; \
sb.sem_num = (mutex)->semnum; \
semop((mutex)->semid, &sb, 1); \
} while(0)
static int
mdb_sem_wait(mdb_mutex_t *sem)
{
int rc;
struct sembuf sb = { sem->semnum, -1, SEM_UNDO };
struct sembuf sb = { 0, -1, SEM_UNDO };
sb.sem_num = sem->semnum;
while ((rc = semop(sem->semid, &sb, 1)) && (rc = errno) == EINTR) ;
return rc;
}
@ -4417,6 +4422,11 @@ mdb_env_setup_locks(MDB_env *env, char *lpath, int mode, int *excl)
env->me_txns->mti_numreaders = 0;
} else {
#ifdef MDB_USE_SYSV_SEM
struct semid_ds buf;
union semun semu;
int semid;
#endif
if (env->me_txns->mti_magic != MDB_MAGIC) {
DPUTS("lock region has invalid magic");
rc = MDB_INVALID;
@ -4438,9 +4448,7 @@ mdb_env_setup_locks(MDB_env *env, char *lpath, int mode, int *excl)
env->me_wmutex = OpenMutex(SYNCHRONIZE, FALSE, env->me_txns->mti_wmname);
if (!env->me_wmutex) goto fail_errno;
#elif defined(MDB_USE_SYSV_SEM)
struct semid_ds buf;
union semun semu;
int semid = env->me_txns->mti_semid;
semid = env->me_txns->mti_semid;
semu.buf = &buf;
/* check for read access */