1 files changed, 11 insertions, 0 deletions
diff --git a/src/os_unix.c b/src/os_unix.c
index ab0d2c7b6..de7f0729c 100644
--- a/src/os_unix.c
+++ b/src/os_unix.c
@@ -1587,6 +1587,16 @@ static void unixLeaveMutex(){
 }
 
 /*
+** Return TRUE if we are currently within the mutex and FALSE if not.
+** This routine is intended for sanity checking only.  It is designed
+** for use in an assert() to verify that the mutex is held or not held
+** in certain routines.
+*/
+static int unixInMutex(){
+  return inMutex;
+}
+
+/*
 ** This function is called automatically when a thread exists to delete
 ** the threads SqliteTsd structure. 
 **
@@ -1706,6 +1716,7 @@ struct sqlite3OsVtbl sqlite3Os = {
   unixCurrentTime,
   unixEnterMutex,
   unixLeaveMutex,
+  unixInMutex,
   unixThreadSpecificData,
   genericMalloc,
   genericRealloc,