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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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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());
}