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mdbx: workaround for Windows LockFileEx/WriteFile bug.

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This resolves https://github.com/leo-yuriev/libmdbx/issues/25
This commit is contained in:
Leo Yuriev 2018-01-31 15:15:54 +03:00
parent 5c9baa06b9
commit 5cfec7a832
3 changed files with 22 additions and 1 deletions
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2
src/bits.h
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@ -743,6 +743,8 @@ struct MDBX_env {
#if defined(_WIN32) || defined(_WIN64)
SRWLOCK me_remap_guard;
/* Workaround for LockFileEx and WriteFile multithread bug */
CRITICAL_SECTION me_windowsbug_lock;
#else
mdbx_fastmutex_t me_remap_guard;
#endif

12
src/lck-windows.c
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@ -127,16 +127,26 @@ static __inline BOOL funlock(mdbx_filehandle_t fd, uint64_t offset,
#define LCK_WHOLE 0, LCK_MAXLEN
int mdbx_txn_lock(MDBX_env *env, bool dontwait) {
if (dontwait) {
if (!TryEnterCriticalSection(&env->me_windowsbug_lock))
return MDBX_BUSY;
} else {
EnterCriticalSection(&env->me_windowsbug_lock);
}
if (flock(env->me_fd, dontwait ? (LCK_EXCLUSIVE | LCK_DONTWAIT)
: (LCK_EXCLUSIVE | LCK_WAITFOR),
LCK_BODY))
return MDBX_SUCCESS;
int rc = GetLastError();
LeaveCriticalSection(&env->me_windowsbug_lock);
return (!dontwait || rc != ERROR_LOCK_VIOLATION) ? rc : MDBX_BUSY;
}
void mdbx_txn_unlock(MDBX_env *env) {
if (!funlock(env->me_fd, LCK_BODY))
int rc = funlock(env->me_fd, LCK_BODY);
LeaveCriticalSection(&env->me_windowsbug_lock);
if (!rc)
mdbx_panic("%s failed: errcode %u", mdbx_func_, GetLastError());
}

9
src/mdbx.c
View File

@ -4450,6 +4450,7 @@ int __cold mdbx_env_create(MDBX_env **penv) {
#if defined(_WIN32) || defined(_WIN64)
InitializeSRWLock(&env->me_remap_guard);
InitializeCriticalSection(&env->me_windowsbug_lock);
#else
rc = mdbx_fastmutex_init(&env->me_remap_guard);
if (unlikely(rc != MDBX_SUCCESS)) {
@ -5487,6 +5488,14 @@ int __cold mdbx_env_close_ex(MDBX_env *env, int dont_sync) {
mdbx_env_close0(env);
mdbx_ensure(env, mdbx_fastmutex_destroy(&env->me_dbi_lock) == MDBX_SUCCESS);
#if defined(_WIN32) || defined(_WIN64)
/* me_remap_guard don't have destructor (Slim Reader/Writer Lock) */
DeleteCriticalSection(&env->me_windowsbug_lock);
#else
mdbx_ensure(env,
mdbx_fastmutex_destroy(&env->me_remap_guard) == MDBX_SUCCESS);
#endif /* Windows */
env->me_signature = 0;
free(env);