diff options
Diffstat (limited to 'lib/libsqlite3/src/mutex_unix.c')
| -rw-r--r-- | lib/libsqlite3/src/mutex_unix.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/lib/libsqlite3/src/mutex_unix.c b/lib/libsqlite3/src/mutex_unix.c index 0a493fa6a7c..dbdaa225b3e 100644 --- a/lib/libsqlite3/src/mutex_unix.c +++ b/lib/libsqlite3/src/mutex_unix.c @@ -81,6 +81,19 @@ static int pthreadMutexNotheld(sqlite3_mutex *p){ #endif /* +** Try to provide a memory barrier operation, needed for initialization +** and also for the implementation of xShmBarrier in the VFS in cases +** where SQLite is compiled without mutexes. +*/ +void sqlite3MemoryBarrier(void){ +#if defined(SQLITE_MEMORY_BARRIER) + SQLITE_MEMORY_BARRIER; +#elif defined(__GNUC__) && GCC_VERSION>=4001000 + __sync_synchronize(); +#endif +} + +/* ** Initialize and deinitialize the mutex subsystem. */ static int pthreadMutexInit(void){ return SQLITE_OK; } |