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Add the ability to not block when opening a write transaction

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This commit is contained in:
James Rouzier
2017-10-25 19:41:28 -04:00
parent 4f1c846437
commit 7c466e53f0
6 changed files with 46 additions and 6 deletions
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18
src/lck-posix.c
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@@ -184,6 +184,13 @@ static int mdbx_robust_lock(MDBX_env *env, pthread_mutex_t *mutex) {
return rc;
}
static int mdbx_robust_trylock(MDBX_env *env, pthread_mutex_t *mutex) {
int rc = pthread_mutex_trylock(mutex);
if (unlikely(rc != 0))
rc = mdbx_mutex_failed(env, mutex, rc);
return rc;
}
static int mdbx_robust_unlock(MDBX_env *env, pthread_mutex_t *mutex) {
int rc = pthread_mutex_unlock(mutex);
if (unlikely(rc != 0))
@@ -213,6 +220,13 @@ int mdbx_txn_lock(MDBX_env *env) {
return MDBX_IS_ERROR(rc) ? rc : MDBX_SUCCESS;
}
int mdbx_txn_trylock(MDBX_env *env) {
mdbx_trace(">>");
int rc = mdbx_robust_trylock(env, &env->me_lck->mti_wmutex);
mdbx_trace("<< rc %d", rc);
return MDBX_IS_ERROR(rc) ? rc : MDBX_SUCCESS;
}
void mdbx_txn_unlock(MDBX_env *env) {
mdbx_trace(">>");
int rc = mdbx_robust_unlock(env, &env->me_lck->mti_wmutex);
@@ -313,7 +327,9 @@ static int __cold mdbx_mutex_failed(MDBX_env *env, pthread_mutex_t *mutex,
#endif /* MDBX_USE_ROBUST */
mdbx_error("mutex (un)lock failed, %s", mdbx_strerror(rc));
if (rc != EDEADLK) {
if (rc == EBUSY) {
rc = MDBX_BUSY;
} else if (rc != EDEADLK && rc != EBUSY) {
env->me_flags |= MDBX_FATAL_ERROR;
rc = MDBX_PANIC;
}