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-rw-r--r--src/mutex_unix.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/src/mutex_unix.c b/src/mutex_unix.c
index cebb96c90..dbdaa225b 100644
--- a/src/mutex_unix.c
+++ b/src/mutex_unix.c
@@ -81,7 +81,9 @@ static int pthreadMutexNotheld(sqlite3_mutex *p){
#endif
/*
-** Try to provide a memory barrier operation, needed for initialization only.
+** 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)