From 4811b7c7e02c0612975a8526f8ebba49ece0e72b Mon Sep 17 00:00:00 2001
From: Brian Paul <brian.paul@tungstengraphics.com>
Date: Thu, 16 Sep 1999 22:45:24 +0000
Subject: initial check-in

---
 src/glut/beos/glutBlocker.cpp | 65 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 65 insertions(+)
 create mode 100644 src/glut/beos/glutBlocker.cpp

(limited to 'src/glut/beos/glutBlocker.cpp')

diff --git a/src/glut/beos/glutBlocker.cpp b/src/glut/beos/glutBlocker.cpp
new file mode 100644
index 0000000000..e2cfcf7b39
--- /dev/null
+++ b/src/glut/beos/glutBlocker.cpp
@@ -0,0 +1,65 @@
+/***********************************************************
+ *	Copyright (C) 1997, Be Inc.  All rights reserved.
+ *
+ *  FILE:	glutBlocker.cpp
+ *
+ *	DESCRIPTION:	helper class for GLUT event loop.
+ *		if a window receives an event, wake up the event loop.
+ ***********************************************************/
+
+/***********************************************************
+ *	Headers
+ ***********************************************************/
+#include "glutBlocker.h"
+
+/***********************************************************
+ *	Global variable
+ ***********************************************************/
+GlutBlocker gBlock;
+
+/***********************************************************
+ *	Member functions
+ ***********************************************************/
+GlutBlocker::GlutBlocker() {
+	gSem = create_sem(1, "gSem");
+	eSem = create_sem(0, "eSem");
+	events = false;
+	sleeping = false;
+}
+
+GlutBlocker::~GlutBlocker() {
+	delete_sem(eSem);
+	delete_sem(gSem);
+}
+
+void GlutBlocker::WaitEvent() {
+	acquire_sem(gSem);
+	if(!events) {			// wait for new event
+		sleeping = true;
+		release_sem(gSem);
+		acquire_sem(eSem);	// next event will release eSem
+	} else {
+		release_sem(gSem);
+	}
+}
+
+void GlutBlocker::WaitEvent(bigtime_t usecs) {
+	acquire_sem(gSem);
+	if(!events) {			// wait for new event
+		sleeping = true;
+		release_sem(gSem);
+		acquire_sem_etc(eSem, 1, B_TIMEOUT, usecs);	// wait for next event or timeout
+	} else {
+		release_sem(gSem);
+	}
+}
+
+void GlutBlocker::NewEvent() {
+	acquire_sem(gSem);
+	events = true;		// next call to WaitEvent returns immediately
+	if(sleeping) {
+		sleeping = false;
+		release_sem(eSem);	// if event loop is blocking, wake it up
+	}
+	release_sem(gSem);
+}
-- 
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