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ITS#7377 Wrap sem_wait & file locks in EINTR loops

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This commit is contained in:
Hallvard Furuseth 2012-09-17 15:42:14 +02:00
parent a35f9b2a53
commit 31be24896b
1 changed files with 29 additions and 12 deletions
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41
libraries/libmdb/mdb.c
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@ -158,11 +158,22 @@
#define close(fd) CloseHandle(fd)
#define munmap(ptr,len) UnmapViewOfFile(ptr)
#else
#ifdef MDB_USE_POSIX_SEM
#define LOCK_MUTEX_R(env) sem_wait((env)->me_rmutex)
#define LOCK_MUTEX_R(env) mdb_sem_wait((env)->me_rmutex)
#define UNLOCK_MUTEX_R(env) sem_post((env)->me_rmutex)
#define LOCK_MUTEX_W(env) sem_wait((env)->me_wmutex)
#define LOCK_MUTEX_W(env) mdb_sem_wait((env)->me_wmutex)
#define UNLOCK_MUTEX_W(env) sem_post((env)->me_wmutex)
static int
mdb_sem_wait(sem_t *sem)
{
int rc;
while ((rc = sem_wait(sem)) && (rc = errno) == EINTR) ;
return rc;
}
#else
/** Lock the reader mutex.
*/
@ -2730,10 +2741,10 @@ PIMAGE_TLS_CALLBACK mdb_tls_cbp = mdb_tls_callback;
#endif
/** Downgrade the exclusive lock on the region back to shared */
static void
static int
mdb_env_share_locks(MDB_env *env)
{
int toggle = mdb_env_pick_meta(env);
int rc = 0, toggle = mdb_env_pick_meta(env);
env->me_txns->mti_txnid = env->me_metas[toggle]->mm_txnid;
@ -2756,14 +2767,18 @@ mdb_env_share_locks(MDB_env *env)
lock_info.l_whence = SEEK_SET;
lock_info.l_start = 0;
lock_info.l_len = 1;
fcntl(env->me_lfd, F_SETLK, &lock_info);
while ((rc = fcntl(env->me_lfd, F_SETLK, &lock_info)) &&
(rc = ErrCode()) == EINTR) ;
}
#endif
return rc;
}
static int
mdb_env_excl_lock(MDB_env *env, int *excl)
{
int rc = 0;
#ifdef _WIN32
if (LockFile(env->me_lfd, 0, 0, 1, 0)) {
*excl = 1;
@ -2771,7 +2786,7 @@ mdb_env_excl_lock(MDB_env *env, int *excl)
OVERLAPPED ov;
memset(&ov, 0, sizeof(ov));
if (!LockFileEx(env->me_lfd, 0, 0, 1, 0, &ov)) {
return ErrCode();
rc = ErrCode();
}
}
#else
@ -2785,12 +2800,11 @@ mdb_env_excl_lock(MDB_env *env, int *excl)
*excl = 1;
} else {
lock_info.l_type = F_RDLCK;
if (fcntl(env->me_lfd, F_SETLKW, &lock_info)) {
return ErrCode();
}
while ((rc = fcntl(env->me_lfd, F_SETLKW, &lock_info)) &&
(rc = ErrCode()) == EINTR) ;
}
#endif
return 0;
return rc;
}
#if defined(_WIN32) || defined(MDB_USE_POSIX_SEM)
@ -3194,8 +3208,11 @@ mdb_env_open(MDB_env *env, const char *path, unsigned int flags, mode_t mode)
goto leave;
}
#endif
if (excl)
mdb_env_share_locks(env);
if (excl) {
rc = mdb_env_share_locks(env);
if (rc)
goto leave;
}
env->me_numdbs = 2;
env->me_dbxs = calloc(env->me_maxdbs, sizeof(MDB_dbx));
env->me_dbflags = calloc(env->me_maxdbs, sizeof(uint16_t));