NextGraph
/
lmdb
mirror of https://github.com/nextgraph-org/lmdb.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

Fix mdb_mutex_t, add mdb_mutexref_t, drop MDB_MUTEX().

Browse Source 
Fixes the types of Windows HANDLEs, they became HANDLE*.
MDB_MUTEX() took a magic r/w arg which it's nice to get rid of.
vl32b
Hallvard Furuseth 10 years ago
parent 8293b20cfe
commit 9574b65648
1 changed files with 40 additions and 37 deletions
Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL
Show Stats Download Patch File Download Diff File
  1. 77
      libraries/liblmdb/mdb.c

77
libraries/liblmdb/mdb.c
Unescape View File

@ -246,7 +246,7 @@ union semun {
#define pthread_t HANDLE
#define pthread_mutex_t HANDLE
#define pthread_cond_t HANDLE
typedef HANDLE mdb_mutex_t;
typedef HANDLE mdb_mutex_t, mdb_mutexref_t;
#define pthread_key_t DWORD
#define pthread_self() GetCurrentThreadId()
#define pthread_key_create(x,y) \
@ -260,7 +260,6 @@ typedef HANDLE mdb_mutex_t;
#define pthread_cond_wait(cond,mutex) do{SignalObjectAndWait(*mutex, *cond, INFINITE, FALSE); WaitForSingleObject(*mutex, INFINITE);}while(0)
#define THREAD_CREATE(thr,start,arg) thr=CreateThread(NULL,0,start,arg,0,NULL)
#define THREAD_FINISH(thr) WaitForSingleObject(thr, INFINITE)
#define MDB_MUTEX(env, rw) ((env)->me_##rw##mutex)
#define LOCK_MUTEX0(mutex) WaitForSingleObject(mutex, INFINITE)
#define UNLOCK_MUTEX(mutex) ReleaseMutex(mutex)
#define mdb_mutex_consistent(mutex) 0
@ -292,9 +291,8 @@ typedef struct mdb_mutex {
int semid;
int semnum;
int *locked;
} mdb_mutex_t;
} mdb_mutex_t[1], *mdb_mutexref_t;
#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 = { 0, 1, SEM_UNDO }; \
@ -304,7 +302,7 @@ typedef struct mdb_mutex {
} while(0)
static int
mdb_sem_wait(mdb_mutex_t *sem)
mdb_sem_wait(mdb_mutexref_t sem)
{
int rc, *locked = sem->locked;
struct sembuf sb = { 0, -1, SEM_UNDO };
@ -322,12 +320,15 @@ mdb_sem_wait(mdb_mutex_t *sem)
#define mdb_mutex_consistent(mutex) 0
#else /* MDB_USE_POSIX_MUTEX: */
/** Pointer/HANDLE type of shared mutex/semaphore.
*/
typedef pthread_mutex_t mdb_mutex_t;
/** Mutex for the reader table (rw = r) or write transaction (rw = w).
/** Shared mutex/semaphore as it is stored (mdb_mutex_t), and as
* local variables keep it (mdb_mutexref_t).
*
* An mdb_mutex_t can be assigned to an mdb_mutexref_t. They can
* be the same, or an array[size 1] and a pointer.
* @{
*/
#define MDB_MUTEX(env, rw) (&(env)->me_txns->mti_##rw##mutex)
typedef pthread_mutex_t mdb_mutex_t[1], *mdb_mutexref_t;
/* @} */
/** Lock the reader or writer mutex.
* Returns 0 or a code to give #mdb_mutex_failed(), as in #LOCK_MUTEX().
*/
@ -386,7 +387,7 @@ typedef pthread_mutex_t mdb_mutex_t;
#define LOCK_MUTEX(rc, env, mutex) \
(((rc) = LOCK_MUTEX0(mutex)) && \
((rc) = mdb_mutex_failed(env, mutex, rc)))
static int mdb_mutex_failed(MDB_env *env, mdb_mutex_t *mutex, int rc);
static int mdb_mutex_failed(MDB_env *env, mdb_mutexref_t mutex, int rc);
#else
#define LOCK_MUTEX(rc, env, mutex) ((rc) = LOCK_MUTEX0(mutex))
#define mdb_mutex_failed(env, mutex, rc) (rc)
@ -711,9 +712,9 @@ typedef struct MDB_txbody {
int mtb_rlocked;
#else
/** Mutex protecting access to this table.
* This is the #MDB_MUTEX(env,r) reader table lock.
* This is the reader table lock used with LOCK_MUTEX().
*/
pthread_mutex_t mtb_rmutex;
mdb_mutex_t mtb_rmutex;
#endif
/** The ID of the last transaction committed to the database.
* This is recorded here only for convenience; the value can always
@ -751,7 +752,7 @@ typedef struct MDB_txninfo {
int mt2_wlocked;
#define mti_wlocked mt2.mt2_wlocked
#else
pthread_mutex_t mt2_wmutex;
mdb_mutex_t mt2_wmutex;
#define mti_wmutex mt2.mt2_wmutex
#endif
char pad[(MNAME_LEN+CACHELINE-1) & ~(CACHELINE-1)];
@ -1242,8 +1243,10 @@ struct MDB_env {
#ifdef _WIN32
int me_pidquery; /**< Used in OpenProcess */
#endif
#if defined(_WIN32) || defined(MDB_USE_SYSV_SEM)
/* Windows mutexes/SysV semaphores do not reside in shared mem */
#ifdef MDB_USE_POSIX_MUTEX /* Posix mutexes reside in shared mem */
# define me_rmutex me_txns->mti_rmutex /**< Shared reader lock */
# define me_wmutex me_txns->mti_wmutex /**< Shared writer lock */
#else
mdb_mutex_t me_rmutex;
mdb_mutex_t me_wmutex;
#endif
@ -2611,7 +2614,7 @@ mdb_txn_renew0(MDB_txn *txn)
} else {
MDB_PID_T pid = env->me_pid;
MDB_THR_T tid = pthread_self();
mdb_mutex_t *rmutex = MDB_MUTEX(env, r);
mdb_mutexref_t rmutex = env->me_rmutex;
if (!env->me_live_reader) {
rc = mdb_reader_pid(env, Pidset, pid);
@ -2663,7 +2666,7 @@ mdb_txn_renew0(MDB_txn *txn)
} else {
/* Not yet touching txn == env->me_txn0, it may be active */
if (ti) {
if (LOCK_MUTEX(rc, env, MDB_MUTEX(env, w)))
if (LOCK_MUTEX(rc, env, env->me_wmutex))
return rc;
txn->mt_txnid = ti->mti_txnid;
meta = env->me_metas[txn->mt_txnid & 1];
@ -2941,7 +2944,7 @@ mdb_txn_reset0(MDB_txn *txn, const char *act)
env->me_txn = NULL;
/* The writer mutex was locked in mdb_txn_begin. */
if (env->me_txns)
UNLOCK_MUTEX(MDB_MUTEX(env, w));
UNLOCK_MUTEX(env->me_wmutex);
} else {
txn->mt_parent->mt_child = NULL;
env->me_pgstate = ((MDB_ntxn *)txn)->mnt_pgstate;
@ -3543,7 +3546,7 @@ done:
mdb_dbis_update(txn, 1);
if (env->me_txns)
UNLOCK_MUTEX(MDB_MUTEX(env, w));
UNLOCK_MUTEX(env->me_wmutex);
if (txn != env->me_txn0)
free(txn);
@ -3838,8 +3841,8 @@ mdb_env_create(MDB_env **env)
e->me_lfd = INVALID_HANDLE_VALUE;
e->me_mfd = INVALID_HANDLE_VALUE;
#ifdef MDB_USE_SYSV_SEM
e->me_rmutex.semid = -1;
e->me_wmutex.semid = -1;
e->me_rmutex->semid = -1;
e->me_wmutex->semid = -1;
#endif
e->me_pid = getpid();
GET_PAGESIZE(e->me_os_psize);
@ -4573,8 +4576,8 @@ mdb_env_setup_locks(MDB_env *env, char *lpath, int mode, int *excl)
#ifdef MDB_ROBUST_SUPPORTED
|| (rc = pthread_mutexattr_setrobust(&mattr, PTHREAD_MUTEX_ROBUST))
#endif
|| (rc = pthread_mutex_init(&env->me_txns->mti_rmutex, &mattr))
|| (rc = pthread_mutex_init(&env->me_txns->mti_wmutex, &mattr)))
|| (rc = pthread_mutex_init(env->me_txns->mti_rmutex, &mattr))
|| (rc = pthread_mutex_init(env->me_txns->mti_wmutex, &mattr)))
goto fail;
pthread_mutexattr_destroy(&mattr);
#endif /* _WIN32 || MDB_USE_SYSV_SEM */
@ -4620,12 +4623,12 @@ mdb_env_setup_locks(MDB_env *env, char *lpath, int mode, int *excl)
#endif
}
#ifdef MDB_USE_SYSV_SEM
env->me_rmutex.semid = semid;
env->me_wmutex.semid = semid;
env->me_rmutex.semnum = 0;
env->me_wmutex.semnum = 1;
env->me_rmutex.locked = &env->me_txns->mti_rlocked;
env->me_wmutex.locked = &env->me_txns->mti_wlocked;
env->me_rmutex->semid = semid;
env->me_wmutex->semid = semid;
env->me_rmutex->semnum = 0;
env->me_wmutex->semnum = 1;
env->me_rmutex->locked = &env->me_txns->mti_rlocked;
env->me_wmutex->locked = &env->me_txns->mti_wlocked;
#endif
return MDB_SUCCESS;
@ -4862,14 +4865,14 @@ mdb_env_close0(MDB_env *env, int excl)
* the last handle closes.
*/
#elif defined(MDB_USE_SYSV_SEM)
if (env->me_rmutex.semid != -1) {
if (env->me_rmutex->semid != -1) {
/* If we have the filelock: If we are the
* only remaining user, clean up semaphores.
*/
if (excl == 0)
mdb_env_excl_lock(env, &excl);
if (excl > 0)
semctl(env->me_rmutex.semid, 0, IPC_RMID);
semctl(env->me_rmutex->semid, 0, IPC_RMID);
}
#endif
munmap((void *)env->me_txns, (env->me_maxreaders-1)*sizeof(MDB_reader)+sizeof(MDB_txninfo));
@ -8908,7 +8911,7 @@ static int ESECT
mdb_env_copyfd0(MDB_env *env, HANDLE fd)
{
MDB_txn *txn = NULL;
mdb_mutex_t *wmutex = NULL;
mdb_mutexref_t wmutex = NULL;
int rc;
size_t wsize;
char *ptr;
@ -8933,7 +8936,7 @@ mdb_env_copyfd0(MDB_env *env, HANDLE fd)
mdb_txn_reset0(txn, "reset-stage1");
/* Temporarily block writers until we snapshot the meta pages */
wmutex = MDB_MUTEX(env, w);
wmutex = env->me_wmutex;
if (LOCK_MUTEX(rc, env, wmutex))
goto leave;
@ -9647,7 +9650,7 @@ mdb_reader_check(MDB_env *env, int *dead)
/** As #mdb_reader_check(). rlocked = <caller locked the reader mutex>. */
static int mdb_reader_check0(MDB_env *env, int rlocked, int *dead)
{
mdb_mutex_t *rmutex = rlocked ? NULL : MDB_MUTEX(env, r);
mdb_mutexref_t rmutex = rlocked ? NULL : env->me_rmutex;
unsigned int i, j, rdrs;
MDB_reader *mr;
MDB_PID_T *pids, pid;
@ -9704,14 +9707,14 @@ static int mdb_reader_check0(MDB_env *env, int rlocked, int *dead)
* @param[in] rc LOCK_MUTEX0() error (nonzero)
* @return 0 on success with the mutex locked, or an error code on failure.
*/
static int mdb_mutex_failed(MDB_env *env, mdb_mutex_t *mutex, int rc)
static int mdb_mutex_failed(MDB_env *env, mdb_mutexref_t mutex, int rc)
{
int toggle, rlocked, rc2;
if (rc == MDB_OWNERDEAD) {
/* We own the mutex. Clean up after dead previous owner. */
rc = MDB_SUCCESS;
rlocked = (mutex == MDB_MUTEX(env, r));
rlocked = (mutex == env->me_rmutex);
if (!rlocked) {
/* Keep mti_txnid updated, otherwise next writer can
* overwrite data which latest meta page refers to.

Write Preview
Loading…
Cancel
Save