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https://github.com/isar/libmdbx.git
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mdbx-posix: refine locking build-options.
Change-Id: I09c0dd453dd39e0105176ad8d9e414e2582849fb
This commit is contained in:
Leonid Yuriev
parent
e2ae62bdb2
commit
2f45c37320
@ -4611,15 +4611,15 @@ static int mdbx_txn_renew0(MDBX_txn *txn, unsigned flags) {
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#endif /* MDBX_TXN_CHECKPID */
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STATIC_ASSERT(sizeof(MDBX_reader) == 32);
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#if MDBX_USE_MUTEXES < 0
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#if MDBX_LOCKING > 0
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STATIC_ASSERT(offsetof(MDBX_lockinfo, mti_wlock) % MDBX_CACHELINE_SIZE == 0);
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STATIC_ASSERT(offsetof(MDBX_lockinfo, mti_rlock) % MDBX_CACHELINE_SIZE == 0);
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#else
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STATIC_ASSERT(
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offsetof(MDBX_lockinfo, mti_oldest_reader) % MDBX_CACHELINE_SIZE == 0);
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STATIC_ASSERT(offsetof(MDBX_lockinfo, mti_numreaders) % MDBX_CACHELINE_SIZE ==
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0);
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#else
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STATIC_ASSERT(offsetof(MDBX_lockinfo, mti_wlock) % MDBX_CACHELINE_SIZE == 0);
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STATIC_ASSERT(offsetof(MDBX_lockinfo, mti_rlock) % MDBX_CACHELINE_SIZE == 0);
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#endif
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#endif /* MDBX_LOCKING */
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STATIC_ASSERT(offsetof(MDBX_lockinfo, mti_readers) % MDBX_CACHELINE_SIZE ==
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0);
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@ -7494,11 +7494,9 @@ int __cold mdbx_env_create(MDBX_env **penv) {
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goto bailout;
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}
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#if MDBX_USE_MUTEXES == 0
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rc = sem_init(&env->me_lckless_stub.wlock, false, 1) ? errno : MDBX_SUCCESS;
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#elif MDBX_USE_MUTEXES > 0
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rc = pthread_mutex_init(&env->me_lckless_stub.wlock, nullptr);
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#endif
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#if MDBX_LOCKING > 0
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rc = mdbx_ipclock_stub(&env->me_lckless_stub.wlock);
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#endif /* MDBX_LOCKING */
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if (unlikely(rc != MDBX_SUCCESS)) {
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mdbx_fastmutex_destroy(&env->me_remap_guard);
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mdbx_fastmutex_destroy(&env->me_dbi_lock);
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@ -8338,9 +8336,9 @@ static int __cold mdbx_setup_lck(MDBX_env *env, char *lck_pathname,
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env->me_discarded_tail = &env->me_lckless_stub.discarded_tail;
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env->me_meta_sync_txnid = &env->me_lckless_stub.meta_sync_txnid;
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env->me_maxreaders = UINT_MAX;
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#if MDBX_USE_MUTEXES >= 0
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#if MDBX_LOCKING > 0
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env->me_wlock = &env->me_lckless_stub.wlock;
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#endif
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#endif /* MDBX_LOCKING */
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mdbx_debug("lck-setup:%s%s%s", " lck-less",
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(env->me_flags & MDBX_RDONLY) ? " readonly" : "",
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(rc == MDBX_RESULT_TRUE) ? " exclusive" : " cooperative");
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@ -8472,9 +8470,9 @@ static int __cold mdbx_setup_lck(MDBX_env *env, char *lck_pathname,
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env->me_autosync_threshold = &lck->mti_autosync_threshold;
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env->me_discarded_tail = &lck->mti_discarded_tail;
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env->me_meta_sync_txnid = &lck->mti_meta_sync_txnid;
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#if MDBX_USE_MUTEXES >= 0
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#if MDBX_LOCKING > 0
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env->me_wlock = &lck->mti_wlock;
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#endif
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#endif /* MDBX_LOCKING */
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return lck_seize_rc;
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}
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@ -8932,11 +8930,9 @@ int __cold mdbx_env_close_ex(MDBX_env *env, int dont_sync) {
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mdbx_fastmutex_destroy(&env->me_remap_guard) == MDBX_SUCCESS);
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#endif /* Windows */
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#if MDBX_USE_MUTEXES == 0
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mdbx_ensure(env, sem_destroy(&env->me_lckless_stub.wlock) == 0);
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#elif MDBX_USE_MUTEXES > 0
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mdbx_ensure(env, pthread_mutex_destroy(&env->me_lckless_stub.wlock) == 0);
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#endif
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#if MDBX_LOCKING > 0
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mdbx_ensure(env, mdbx_ipclock_destroy(&env->me_lckless_stub.wlock) == 0);
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#endif /* MDBX_LOCKING */
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mdbx_ensure(env, env->me_lcklist_next == nullptr);
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env->me_pid = 0;
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@ -15043,7 +15039,7 @@ int __cold mdbx_reader_check0(MDBX_env *env, int rdt_locked, int *dead) {
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rdt_locked = -1;
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if (err == MDBX_RESULT_TRUE) {
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/* mutex recovered, the mdbx_mutex_failed() checked all readers */
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/* mutex recovered, the mdbx_ipclock_failed() checked all readers */
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rc = MDBX_RESULT_TRUE;
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break;
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}
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@ -16677,7 +16673,7 @@ __dll_export
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" MDBX_BUILD_SHARED_LIBRARY=" STRINGIFY(MDBX_BUILD_SHARED_LIBRARY)
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" WINVER=" STRINGIFY(WINVER)
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#else /* Windows */
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" MDBX_USE_MUTEXES=" MDBX_USE_MUTEXES_CONFIG
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" MDBX_LOCKING=" MDBX_LOCKING_CONFIG
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" MDBX_USE_OFDLOCKS=" MDBX_USE_OFDLOCKS_CONFIG
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#endif /* !Windows */
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" MDBX_CACHELINE_SIZE=" STRINGIFY(MDBX_CACHELINE_SIZE)
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@ -203,32 +203,37 @@
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#define MDBX_64BIT_CAS_CONFIG STRINGIFY(MDBX_64BIT_CAS)
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#endif /* MDBX_64BIT_CAS */
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#define MDBX_LOCKING_WIN32FILES -1
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#define MDBX_LOCKING_POSIX1988 1988 /* POSIX-1 Shared anonymous semaphores */
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#define MDBX_LOCKING_POSIX2001 2001 /* POSIX-2001 Shared Mutexes */
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#define MDBX_LOCKING_POSIX2008 2008 /* POSIX-2008 Robust Mutexes */
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#if defined(_WIN32) || defined(_WIN64)
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#define MDBX_USE_MUTEXES -1 /* Windows don't support POSIX */
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#define MDBX_LOCKING MDBX_LOCKING_WIN32FILES
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#else
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#ifndef MDBX_USE_MUTEXES
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#ifndef MDBX_LOCKING
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#if defined(_POSIX_THREAD_PROCESS_SHARED) && \
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_POSIX_THREAD_PROCESS_SHARED >= 200112L && !defined(__FreeBSD__)
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/* Some platforms define the EOWNERDEAD error code even though they
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* don't support Robust Mutexes. If doubt compile with -MDBX_USE_MUTEXES=1. */
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* don't support Robust Mutexes. If doubt compile with -MDBX_LOCKING=2001. */
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#if defined(EOWNERDEAD) && _POSIX_THREAD_PROCESS_SHARED >= 200809L && \
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(defined(_POSIX_THREAD_ROBUST_PRIO_INHERIT) || \
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defined(_POSIX_THREAD_ROBUST_PRIO_PROTECT) || \
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defined(PTHREAD_MUTEX_ROBUST) || defined(PTHREAD_MUTEX_ROBUST_NP)) && \
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(!defined(__GLIBC__) || \
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__GLIBC_PREREQ(2, 10) /* troubles with Robust mutexes before 2.10 */)
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#define MDBX_USE_MUTEXES 2 /* use robust shared pthread mutexes */
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#define MDBX_LOCKING MDBX_LOCKING_POSIX2008
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#else
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#define MDBX_USE_MUTEXES 1 /* use shared pthread mutexes */
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#define MDBX_LOCKING MDBX_LOCKING_POSIX2001
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#endif
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#else
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#define MDBX_USE_MUTEXES 0 /* use unnamed shared semaphores */
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#define MDBX_LOCKING MDBX_LOCKING_POSIX1988
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#endif
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#define MDBX_USE_MUTEXES_CONFIG "AUTO=" STRINGIFY(MDBX_USE_MUTEXES)
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#define MDBX_LOCKING_CONFIG "AUTO=" STRINGIFY(MDBX_LOCKING)
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#else
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#define MDBX_USE_MUTEXES_CONFIG STRINGIFY(MDBX_USE_MUTEXES)
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#endif /* MDBX_USE_MUTEXES */
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#define MDBX_LOCKING_CONFIG STRINGIFY(MDBX_LOCKING)
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#endif /* MDBX_LOCKING */
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#endif /* !Windows */
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#ifndef MDBX_USE_OFDLOCKS
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@ -502,6 +507,25 @@ typedef struct MDBX_page {
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#pragma pack(pop)
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#if MDBX_LOCKING > 0
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#if MDBX_LOCKING == MDBX_LOCKING_POSIX2001 || \
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MDBX_LOCKING == MDBX_LOCKING_POSIX2008
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#define MDBX_CLOCK_SIGN UINT32_C(0x8017)
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typedef pthread_mutex_t mdbx_ipclock_t;
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#elif MDBX_LOCKING == MDBX_LOCKING_POSIX1988
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#define MDBX_CLOCK_SIGN UINT32_C(0xFC29)
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typedef sem_t mdbx_ipclock_t;
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#else
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#error "FIXME"
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#endif
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MDBX_INTERNAL_FUNC int mdbx_ipclock_stub(mdbx_ipclock_t *ipc);
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MDBX_INTERNAL_FUNC int mdbx_ipclock_destroy(mdbx_ipclock_t *ipc);
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#else
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#define MDBX_CLOCK_SIGN UINT32_C(0xF10C)
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#endif /* MDBX_LOCKING */
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/* Reader Lock Table
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*
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* Readers don't acquire any locks for their data access. Instead, they
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@ -617,16 +641,11 @@ typedef struct MDBX_lockinfo {
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volatile bin128_t mti_bootid;
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alignas(MDBX_CACHELINE_SIZE) /* cacheline ---------------------------------*/
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/* Write transation lok. */
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#if MDBX_USE_MUTEXES > 0
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pthread_mutex_t mti_wlock;
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#define MDBX_OSAL_LOCK_SIGN UINT32_C(0x8017)
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#elif MDBX_USE_MUTEXES == 0
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sem_t mti_wlock;
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#define MDBX_OSAL_LOCK_SIGN UINT32_C(0xFC29)
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#else
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#define MDBX_OSAL_LOCK_SIGN UINT32_C(0xF10C)
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#endif /* MDBX_USE_MUTEXES */
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#if MDBX_LOCKING > 0
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mdbx_ipclock_t mti_wlock;
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#endif /* MDBX_LOCKING */
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volatile txnid_t mti_oldest_reader;
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@ -647,11 +666,9 @@ typedef struct MDBX_lockinfo {
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alignas(MDBX_CACHELINE_SIZE) /* cacheline ---------------------------------*/
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/* Readeaders registration lock. */
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#if MDBX_USE_MUTEXES > 0
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pthread_mutex_t mti_rlock;
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#elif MDBX_USE_MUTEXES == 0
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sem_t mti_rlock;
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#endif /* MDBX_USE_MUTEXES */
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#if MDBX_LOCKING > 0
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mdbx_ipclock_t mti_rlock;
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#endif /* MDBX_LOCKING */
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/* The number of slots that have been used in the reader table.
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* This always records the maximum count, it is not decremented
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@ -665,7 +682,7 @@ typedef struct MDBX_lockinfo {
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/* Lockfile format signature: version, features and field layout */
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#define MDBX_LOCK_FORMAT \
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(MDBX_OSAL_LOCK_SIGN * 27733 + (unsigned)sizeof(MDBX_reader) * 13 + \
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(MDBX_CLOCK_SIGN * 27733 + (unsigned)sizeof(MDBX_reader) * 13 + \
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(unsigned)offsetof(MDBX_reader, mr_snapshot_pages_used) * 251 + \
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(unsigned)offsetof(MDBX_lockinfo, mti_oldest_reader) * 83 + \
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(unsigned)offsetof(MDBX_lockinfo, mti_numreaders) * 37 + \
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@ -1003,11 +1020,9 @@ struct MDBX_env {
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MDBX_txn *me_txn0; /* prealloc'd write transaction */
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/* write-txn lock */
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#if MDBX_USE_MUTEXES > 0
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pthread_mutex_t *me_wlock;
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#elif MDBX_USE_MUTEXES == 0
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sem_t *me_wlock;
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#endif /* MDBX_USE_MUTEXES */
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#if MDBX_LOCKING > 0
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mdbx_ipclock_t *me_wlock;
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#endif /* MDBX_LOCKING */
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MDBX_dbx *me_dbxs; /* array of static DB info */
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uint16_t *me_dbflags; /* array of flags from MDBX_db.md_flags */
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@ -1033,11 +1048,9 @@ struct MDBX_env {
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volatile uint32_t *me_meta_sync_txnid;
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MDBX_oom_func *me_oom_func; /* Callback for kicking laggard readers */
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struct {
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#if MDBX_USE_MUTEXES > 0
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pthread_mutex_t wlock;
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#elif MDBX_USE_MUTEXES == 0
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sem_t wlock;
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#endif /* MDBX_USE_MUTEXES */
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#if MDBX_LOCKING > 0
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mdbx_ipclock_t wlock;
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#endif /* MDBX_LOCKING */
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txnid_t oldest;
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uint64_t sync_timestamp;
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uint64_t autosync_period;
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@ -195,6 +195,30 @@ MDBX_INTERNAL_FUNC int mdbx_rpid_check(MDBX_env *env, uint32_t pid) {
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/*---------------------------------------------------------------------------*/
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#if MDBX_LOCKING > 0
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MDBX_INTERNAL_FUNC int mdbx_ipclock_stub(mdbx_ipclock_t *ipc) {
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#if MDBX_LOCKING == MDBX_LOCKING_POSIX1988
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return sem_init(ipc, false, 1) ? errno : 0;
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#elif MDBX_LOCKING == MDBX_LOCKING_POSIX2001 || \
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MDBX_LOCKING == MDBX_LOCKING_POSIX2008
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return pthread_mutex_init(ipc, nullptr);
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#else
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#error "FIXME"
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#endif
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}
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MDBX_INTERNAL_FUNC int mdbx_ipclock_destroy(mdbx_ipclock_t *ipc) {
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#if MDBX_LOCKING == MDBX_LOCKING_POSIX1988
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return sem_destroy(ipc) ? errno : 0;
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#elif MDBX_LOCKING == MDBX_LOCKING_POSIX2001 || \
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MDBX_LOCKING == MDBX_LOCKING_POSIX2008
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return pthread_mutex_destroy(ipc);
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#else
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#error "FIXME"
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#endif
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}
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#endif /* MDBX_LOCKING */
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MDBX_INTERNAL_FUNC int __cold mdbx_lck_seize(MDBX_env *env) {
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assert(env->me_fd != INVALID_HANDLE_VALUE);
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if (unlikely(mdbx_getpid() != env->me_pid))
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@ -339,18 +363,15 @@ MDBX_INTERNAL_FUNC int __cold mdbx_lck_destroy(MDBX_env *env,
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lck_op(env->me_fd, op_setlk,
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(env->me_flags & MDBX_RDONLY) ? F_RDLCK : F_WRLCK, 0,
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OFF_T_MAX) == 0) {
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mdbx_verbose("%s: got exclusive, drown mutexes", __func__);
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#if MDBX_USE_MUTEXES > 0
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rc = pthread_mutex_destroy(&env->me_lck->mti_rlock);
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if (rc == 0)
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rc = pthread_mutex_destroy(&env->me_lck->mti_wlock);
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#else
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rc = sem_destroy(&env->me_lck->mti_rlock) ? errno : 0;
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if (rc == 0)
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rc = sem_destroy(&env->me_lck->mti_wlock) ? errno : 0;
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#endif /* MDBX_USE_MUTEXES */
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mdbx_assert(env, rc == 0);
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mdbx_verbose("%s: got exclusive, drown locks", __func__);
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#if MDBX_LOCKING > 0
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rc = mdbx_ipclock_destroy(&env->me_lck->mti_rlock);
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if (rc == 0)
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rc = mdbx_ipclock_destroy(&env->me_lck->mti_wlock);
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#endif /* MDBX_LOCKING */
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mdbx_assert(env, rc == 0);
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if (rc == 0) {
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mdbx_munmap(&env->me_lck_mmap);
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rc = ftruncate(env->me_lfd, 0) ? errno : 0;
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@ -411,7 +432,7 @@ MDBX_INTERNAL_FUNC int __cold mdbx_lck_init(MDBX_env *env,
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if LCK already opened/used inside current process */
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;
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#if MDBX_USE_MUTEXES == 0
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#if MDBX_LOCKING == MDBX_LOCKING_POSIX1988
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/* don't initialize semaphores twice */
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if (global_uniqueness_flag == MDBX_RESULT_TRUE) {
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@ -422,7 +443,8 @@ MDBX_INTERNAL_FUNC int __cold mdbx_lck_init(MDBX_env *env,
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}
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return MDBX_SUCCESS;
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#else
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#elif MDBX_LOCKING == MDBX_LOCKING_POSIX2001 || \
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MDBX_LOCKING == MDBX_LOCKING_POSIX2008
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/* FIXME: Unfortunately, there is no other reliable way but to long testing
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* on each platform. On the other hand, behavior like FreeBSD is incorrect
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@ -453,33 +475,32 @@ MDBX_INTERNAL_FUNC int __cold mdbx_lck_init(MDBX_env *env,
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if (rc)
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goto bailout;
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#if MDBX_USE_MUTEXES > 1
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#if defined(PTHREAD_MUTEX_ROBUST)
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#if MDBX_LOCKING == MDBX_LOCKING_POSIX2008
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#if defined(PTHREAD_MUTEX_ROBUST) || defined(pthread_mutexattr_setrobust)
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rc = pthread_mutexattr_setrobust(&ma, PTHREAD_MUTEX_ROBUST);
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#elif defined(PTHREAD_MUTEX_ROBUST_NP)
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#elif defined(PTHREAD_MUTEX_ROBUST_NP) || \
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defined(pthread_mutexattr_setrobust_np)
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rc = pthread_mutexattr_setrobust_np(&ma, PTHREAD_MUTEX_ROBUST_NP);
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#elif /* defined(__GLIBC__) && !__GLIBC_PREREQ(2, 12) && \
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!defined(pthread_mutex_consistent) && */ \
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_POSIX_C_SOURCE < 200809L
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#elif _POSIX_THREAD_PROCESS_SHARED < 200809L
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rc = pthread_mutexattr_setrobust_np(&ma, PTHREAD_MUTEX_ROBUST_NP);
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#else
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rc = pthread_mutexattr_setrobust(&ma, PTHREAD_MUTEX_ROBUST);
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#endif
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if (rc)
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goto bailout;
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#endif /* MDBX_USE_MUTEXES > 1 (USE_ROBUST) */
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#endif /* MDBX_LOCKING == MDBX_LOCKING_POSIX2008 */
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#if defined(_POSIX_THREAD_PRIO_INHERIT) && _POSIX_THREAD_PRIO_INHERIT > 0 && \
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#if defined(_POSIX_THREAD_PRIO_INHERIT) && _POSIX_THREAD_PRIO_INHERIT >= 0 && \
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!defined(MDBX_SAFE4QEMU)
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rc = pthread_mutexattr_setprotocol(&ma, PTHREAD_PRIO_INHERIT);
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if (rc == ENOTSUP)
|
||||
rc = pthread_mutexattr_setprotocol(&ma, PTHREAD_PRIO_NONE);
|
||||
if (rc)
|
||||
if (rc && rc != ENOTSUP)
|
||||
goto bailout;
|
||||
#endif /* PTHREAD_PRIO_INHERIT */
|
||||
|
||||
rc = pthread_mutexattr_settype(&ma, PTHREAD_MUTEX_ERRORCHECK);
|
||||
if (rc)
|
||||
if (rc && rc != ENOTSUP)
|
||||
goto bailout;
|
||||
|
||||
rc = pthread_mutex_init(&env->me_lck->mti_rlock, &ma);
|
||||
@ -490,18 +511,19 @@ MDBX_INTERNAL_FUNC int __cold mdbx_lck_init(MDBX_env *env,
|
||||
bailout:
|
||||
pthread_mutexattr_destroy(&ma);
|
||||
return rc;
|
||||
#endif /* MDBX_USE_MUTEXES */
|
||||
#else
|
||||
#error "FIXME"
|
||||
#endif /* MDBX_LOCKING > 0 */
|
||||
}
|
||||
|
||||
#if MDBX_USE_MUTEXES > 0
|
||||
static int __cold mdbx_mutex_failed(MDBX_env *env, pthread_mutex_t *mutex,
|
||||
const int err) {
|
||||
static int __cold mdbx_ipclock_failed(MDBX_env *env, mdbx_ipclock_t *ipc,
|
||||
const int err) {
|
||||
int rc = err;
|
||||
#if MDBX_USE_MUTEXES > 1
|
||||
#if MDBX_LOCKING == MDBX_LOCKING_POSIX2008
|
||||
if (err == EOWNERDEAD) {
|
||||
/* We own the mutex. Clean up after dead previous owner. */
|
||||
|
||||
int rlocked = (env->me_lck && mutex == &env->me_lck->mti_rlock);
|
||||
const bool rlocked = (env->me_lck && ipc == &env->me_lck->mti_rlock);
|
||||
rc = MDBX_SUCCESS;
|
||||
if (!rlocked) {
|
||||
if (unlikely(env->me_txn)) {
|
||||
@ -517,11 +539,14 @@ static int __cold mdbx_mutex_failed(MDBX_env *env, pthread_mutex_t *mutex,
|
||||
int check_rc = mdbx_reader_check0(env, rlocked, NULL);
|
||||
check_rc = (check_rc == MDBX_SUCCESS) ? MDBX_RESULT_TRUE : check_rc;
|
||||
|
||||
#if defined(__GLIBC__) && !__GLIBC_PREREQ(2, 12) && \
|
||||
!defined(pthread_mutex_consistent) && _POSIX_C_SOURCE < 200809L
|
||||
int mreco_rc = pthread_mutex_consistent_np(mutex);
|
||||
#if defined(PTHREAD_MUTEX_ROBUST) || defined(pthread_mutex_consistent)
|
||||
int mreco_rc = pthread_mutex_consistent(ipc);
|
||||
#elif defined(PTHREAD_MUTEX_ROBUST_NP) || defined(pthread_mutex_consistent_np)
|
||||
int mreco_rc = pthread_mutex_consistent_np(ipc);
|
||||
#elif _POSIX_THREAD_PROCESS_SHARED < 200809L
|
||||
int mreco_rc = pthread_mutex_consistent_np(ipc);
|
||||
#else
|
||||
int mreco_rc = pthread_mutex_consistent(mutex);
|
||||
int mreco_rc = pthread_mutex_consistent(ipc);
|
||||
#endif
|
||||
check_rc = (mreco_rc == 0) ? check_rc : mreco_rc;
|
||||
|
||||
@ -530,12 +555,16 @@ static int __cold mdbx_mutex_failed(MDBX_env *env, pthread_mutex_t *mutex,
|
||||
|
||||
rc = (rc == MDBX_SUCCESS) ? check_rc : rc;
|
||||
if (MDBX_IS_ERROR(rc))
|
||||
pthread_mutex_unlock(mutex);
|
||||
pthread_mutex_unlock(ipc);
|
||||
return rc;
|
||||
}
|
||||
#elif MDBX_LOCKING == MDBX_LOCKING_POSIX2001
|
||||
(void)ipc;
|
||||
#elif MDBX_LOCKING == MDBX_LOCKING_POSIX1988
|
||||
(void)ipc;
|
||||
#else
|
||||
(void)mutex;
|
||||
#endif /* MDBX_USE_MUTEXES > 1 (USE_ROBUST) */
|
||||
#error "FIXME"
|
||||
#endif /* MDBX_LOCKING */
|
||||
|
||||
mdbx_error("mutex (un)lock failed, %s", mdbx_strerror(err));
|
||||
if (rc != EDEADLK)
|
||||
@ -543,85 +572,73 @@ static int __cold mdbx_mutex_failed(MDBX_env *env, pthread_mutex_t *mutex,
|
||||
return rc;
|
||||
}
|
||||
|
||||
static int mdbx_robust_lock(MDBX_env *env, pthread_mutex_t *mutex) {
|
||||
int rc = pthread_mutex_lock(mutex);
|
||||
if (unlikely(rc != 0))
|
||||
rc = mdbx_mutex_failed(env, mutex, rc);
|
||||
static int mdbx_ipclock_lock(MDBX_env *env, mdbx_ipclock_t *ipc,
|
||||
const bool dont_wait) {
|
||||
#if MDBX_LOCKING == MDBX_LOCKING_POSIX2001 || \
|
||||
MDBX_LOCKING == MDBX_LOCKING_POSIX2008
|
||||
int rc = dont_wait ? pthread_mutex_trylock(ipc) : pthread_mutex_lock(ipc);
|
||||
rc = (rc == EBUSY && dont_wait) ? MDBX_BUSY : rc;
|
||||
#elif MDBX_LOCKING == MDBX_LOCKING_POSIX1988
|
||||
int rc = MDBX_SUCCESS;
|
||||
if (dont_wait) {
|
||||
if (sem_trywait(ipc)) {
|
||||
rc = errno;
|
||||
if (rc == EAGAIN)
|
||||
rc = MDBX_BUSY;
|
||||
}
|
||||
} else if (sem_wait(ipc))
|
||||
rc = errno;
|
||||
#else
|
||||
#error "FIXME"
|
||||
#endif /* MDBX_LOCKING */
|
||||
|
||||
if (unlikely(rc != MDBX_SUCCESS && rc != MDBX_BUSY))
|
||||
rc = mdbx_ipclock_failed(env, ipc, rc);
|
||||
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 != EBUSY))
|
||||
rc = mdbx_mutex_failed(env, mutex, rc);
|
||||
return (rc != EBUSY) ? rc : MDBX_BUSY;
|
||||
}
|
||||
|
||||
static int mdbx_robust_unlock(MDBX_env *env, pthread_mutex_t *mutex) {
|
||||
int rc = pthread_mutex_unlock(mutex);
|
||||
if (unlikely(rc != 0))
|
||||
env->me_flags |= MDBX_FATAL_ERROR;
|
||||
static int mdbx_ipclock_unlock(mdbx_ipclock_t *ipc) {
|
||||
#if MDBX_LOCKING == MDBX_LOCKING_POSIX2001 || \
|
||||
MDBX_LOCKING == MDBX_LOCKING_POSIX2008
|
||||
int rc = pthread_mutex_unlock(ipc);
|
||||
#elif MDBX_LOCKING == MDBX_LOCKING_POSIX1988
|
||||
int rc = sem_post(ipc) ? errno : MDBX_SUCCESS;
|
||||
#else
|
||||
#error "FIXME"
|
||||
#endif /* MDBX_LOCKING */
|
||||
return rc;
|
||||
}
|
||||
#endif /* MDBX_USE_MUTEXES */
|
||||
|
||||
MDBX_INTERNAL_FUNC int mdbx_rdt_lock(MDBX_env *env) {
|
||||
mdbx_trace("%s", ">>");
|
||||
mdbx_jitter4testing(true);
|
||||
#if MDBX_USE_MUTEXES > 0
|
||||
int rc = mdbx_robust_lock(env, &env->me_lck->mti_rlock);
|
||||
#else
|
||||
int rc = sem_wait(&env->me_lck->mti_rlock) ? errno : MDBX_SUCCESS;
|
||||
#endif /* MDBX_USE_MUTEXES */
|
||||
int rc = mdbx_ipclock_lock(env, &env->me_lck->mti_rlock, false);
|
||||
mdbx_trace("<< rc %d", rc);
|
||||
return rc;
|
||||
}
|
||||
|
||||
MDBX_INTERNAL_FUNC void mdbx_rdt_unlock(MDBX_env *env) {
|
||||
mdbx_trace("%s", ">>");
|
||||
#if MDBX_USE_MUTEXES > 0
|
||||
int rc = mdbx_robust_unlock(env, &env->me_lck->mti_rlock);
|
||||
#else
|
||||
int rc = sem_post(&env->me_lck->mti_rlock) ? errno : MDBX_SUCCESS;
|
||||
#endif /* MDBX_USE_MUTEXES */
|
||||
int rc = mdbx_ipclock_unlock(&env->me_lck->mti_rlock);
|
||||
mdbx_trace("<< rc %d", rc);
|
||||
if (unlikely(MDBX_IS_ERROR(rc)))
|
||||
if (unlikely(rc != MDBX_SUCCESS))
|
||||
mdbx_panic("%s() failed: errcode %d\n", __func__, rc);
|
||||
else
|
||||
mdbx_jitter4testing(true);
|
||||
mdbx_jitter4testing(true);
|
||||
}
|
||||
|
||||
int mdbx_txn_lock(MDBX_env *env, bool dontwait) {
|
||||
mdbx_trace("%s", ">>");
|
||||
int mdbx_txn_lock(MDBX_env *env, bool dont_wait) {
|
||||
mdbx_trace("%swait %s", dont_wait ? "dont-" : "", ">>");
|
||||
mdbx_jitter4testing(true);
|
||||
#if MDBX_USE_MUTEXES > 0
|
||||
int rc = dontwait ? mdbx_robust_trylock(env, env->me_wlock)
|
||||
: mdbx_robust_lock(env, env->me_wlock);
|
||||
#else
|
||||
int rc = MDBX_SUCCESS;
|
||||
if (dontwait) {
|
||||
if (sem_trywait(&env->me_lck->mti_wlock)) {
|
||||
rc = errno;
|
||||
if (rc == EAGAIN)
|
||||
rc = MDBX_BUSY;
|
||||
}
|
||||
} else if (sem_wait(&env->me_lck->mti_wlock))
|
||||
rc = errno;
|
||||
#endif /* MDBX_USE_MUTEXES */
|
||||
int rc = mdbx_ipclock_lock(env, env->me_wlock, dont_wait);
|
||||
mdbx_trace("<< rc %d", rc);
|
||||
return MDBX_IS_ERROR(rc) ? rc : MDBX_SUCCESS;
|
||||
}
|
||||
|
||||
void mdbx_txn_unlock(MDBX_env *env) {
|
||||
mdbx_trace("%s", ">>");
|
||||
#if MDBX_USE_MUTEXES > 0
|
||||
int rc = mdbx_robust_unlock(env, env->me_wlock);
|
||||
#else
|
||||
int rc = sem_post(&env->me_lck->mti_wlock) ? errno : MDBX_SUCCESS;
|
||||
#endif /* MDBX_USE_MUTEXES */
|
||||
int rc = mdbx_ipclock_unlock(env->me_wlock);
|
||||
mdbx_trace("<< rc %d", rc);
|
||||
if (unlikely(MDBX_IS_ERROR(rc)))
|
||||
if (unlikely(rc != MDBX_SUCCESS))
|
||||
mdbx_panic("%s() failed: errcode %d\n", __func__, rc);
|
||||
else
|
||||
mdbx_jitter4testing(true);
|
||||
mdbx_jitter4testing(true);
|
||||
}
|
||||
|
||||
@ -774,7 +774,7 @@ MDBX_INTERNAL_FUNC void mdbx_rdt_unlock(MDBX_env *env);
|
||||
/// Reading transactions will not be blocked.
|
||||
/// Declared as LIBMDBX_API because it is used in mdbx_chk.
|
||||
/// \return Error code or zero on success
|
||||
LIBMDBX_API int mdbx_txn_lock(MDBX_env *env, bool dontwait);
|
||||
LIBMDBX_API int mdbx_txn_lock(MDBX_env *env, bool dont_wait);
|
||||
|
||||
/// \brief Releases lock once DB changes is made (after writing transaction
|
||||
/// has finished).
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user