1 files changed, 43 insertions, 0 deletions
diff --git a/src/glut/beos/glutBlocker.h b/src/glut/beos/glutBlocker.h
new file mode 100644
index 00000000000..e6d1f4e049f
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+++ b/src/glut/beos/glutBlocker.h
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+/***********************************************************
+ *	Copyright (C) 1997, Be Inc.  All rights reserved.
+ *
+ *  FILE:	glutBlocker.h
+ *
+ *	DESCRIPTION:	helper class for GLUT event loop.
+ *		if a window receives an event, wake up the event loop.
+ ***********************************************************/
+
+/***********************************************************
+ *	Headers
+ ***********************************************************/
+#include <kernel/OS.h>
+
+/***********************************************************
+ *	CLASS:	GlutBlocker
+ *
+ *	DESCRIPTION:  Fairly naive, but safe implementation.
+ *		global semaphore controls access to state
+ *		event semaphore blocks WaitEvent() call if necessary
+ *		(this is basically a condition variable class)
+ ***********************************************************/
+class GlutBlocker {
+public:
+	GlutBlocker();
+	~GlutBlocker();
+	void WaitEvent();		// wait for new event
+	void WaitEvent(bigtime_t usecs);	// wait with timeout
+	void NewEvent();		// new event from a window (may need to wakeup main thread)
+	void QuickNewEvent() { events = true; }	// new event from main thread
+	void ClearEvents() { events = false; }		// clear counter at beginning of event loop
+	bool PendingEvent() { return events; }		// XPending() equivalent
+private:
+	sem_id gSem;
+	sem_id eSem;
+	bool events;	// are there any new events?
+	bool sleeping;	// is someone sleeping on eSem?
+};
+
+/***********************************************************
+ *	Global variable
+ ***********************************************************/
+extern GlutBlocker gBlock;
+\ No newline at end of file