Changed the atexit code to trip the timer thread's write signal.

This fixes one of the causes of the "pthread_cond_destroy(ref) failed, 16 EBUSY" error,
in which the timer thread was stuck waiting on the write_happend signal and never read
the cancel request. This doesn't fix the issue of attempting to cancel threads waiting
on a Linda signal. So this error message ( and seg fault ) can easily be recreated just
by making a new thread, having it wait indefinitly on a Linda and then trying to cancel
the thread.

1 files changed, 9 insertions, 5 deletions

diff --git a/src/lanes.c b/src/lanes.c
index aef023e..0873339 100644
--- a/src/lanes.c
+++ b/src/lanes.c
@@ -989,6 +989,11 @@ static void selfdestruct_remove( struct s_lane *s ) {
     MUTEX_UNLOCK( &selfdestruct_cs );
 }
 
+// Initialized by 'init_once_LOCKED()': the deep userdata Linda object
+// used for timers (each lane will get a proxy to this)
+//
+volatile DEEP_PRELUDE *timer_deep;  // = NULL
+
 /*
 * Process end; cancel any still free-running threads
 */
@@ -1008,6 +1013,10 @@ static void selfdestruct_atexit( void ) {
     }
     MUTEX_UNLOCK( &selfdestruct_cs );
 
+    // Tell the timer thread to check it's cancel request
+    struct s_Linda *td = timer_deep->deep;
+    SIGNAL_ALL( &td->write_happened);
+
     // When noticing their cancel, the lanes will remove themselves from
     // the selfdestruct chain.
 
@@ -1954,11 +1963,6 @@ __declspec(dllexport)
 #endif
         luaopen_lanes( lua_State *L ) {
 
-    // Initialized by 'init_once_LOCKED()': the deep userdata Linda object
-    // used for timers (each lane will get a proxy to this)
-    //
-    static volatile DEEP_PRELUDE *timer_deep;  // = NULL
-
     /*
     * Making one-time initializations.
     *