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/***********************************************************
* Copyright (C) 1997, Be Inc. Copyright (C) 1999, Jake Hamby.
*
* This program is freely distributable without licensing fees
* and is provided without guarantee or warrantee expressed or
* implied. This program is -not- in the public domain.
*
* 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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