X-Git-Url: http://git.xonotic.org/?a=blobdiff_plain;f=thread_win.c;h=8564ca195dd64fa416f4557efe3a871fe535c59e;hb=f85803e7bc2d0612763bdb8548c7060ddb542afb;hp=77fe939cd291de9f017daf5ccf3d4c615aea3b19;hpb=b0cf9e63ac2bba7fd155b2bb53318fc85ef168d6;p=xonotic%2Fdarkplaces.git

diff --git a/thread_win.c b/thread_win.c
index 77fe939c..8564ca19 100644
--- a/thread_win.c
+++ b/thread_win.c
@@ -250,3 +250,54 @@ int _Thread_WaitThread(void *d, int retval, const char *filename, int fileline)
 	free(w);
 	return retval;
 }
+
+// standard barrier implementation using conds and mutexes
+// see: http://www.howforge.com/implementing-barrier-in-pthreads
+typedef struct {
+	unsigned int needed;
+	unsigned int called;
+	void *mutex;
+	void *cond;
+} barrier_t;
+
+void *_Thread_CreateBarrier(unsigned int count, const char *filename, int fileline)
+{
+	volatile barrier_t *b = (volatile barrier_t *) Z_Malloc(sizeof(barrier_t));
+#ifdef THREADDEBUG
+	Sys_PrintfToTerminal("%p barrier create(%d) %s:%i\n", b, count, filename, fileline);
+#endif
+	b->needed = count;
+	b->called = 0;
+	b->mutex = Thread_CreateMutex();
+	b->cond = Thread_CreateCond();
+	return (void *) b;
+}
+
+void _Thread_DestroyBarrier(void *barrier, const char *filename, int fileline)
+{
+	volatile barrier_t *b = (volatile barrier_t *) barrier;
+#ifdef THREADDEBUG
+	Sys_PrintfToTerminal("%p barrier destroy %s:%i\n", b, filename, fileline);
+#endif
+	Thread_DestroyMutex(b->mutex);
+	Thread_DestroyCond(b->cond);
+}
+
+void _Thread_WaitBarrier(void *barrier, const char *filename, int fileline)
+{
+	volatile barrier_t *b = (volatile barrier_t *) barrier;
+#ifdef THREADDEBUG
+	Sys_PrintfToTerminal("%p barrier wait %s:%i\n", b, filename, fileline);
+#endif
+	Thread_LockMutex(b->mutex);
+	b->called++;
+	if (b->called == b->needed) {
+		b->called = 0;
+		Thread_CondBroadcast(b->cond);
+	} else {
+		do {
+			Thread_CondWait(b->cond, b->mutex);
+		} while(b->called);
+	}
+	Thread_UnlockMutex(b->mutex);
+}