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/*
flext tutorial - threads 2
Copyright (c) 2002,2003 Thomas Grill (xovo@gmx.net)
For information on usage and redistribution, and for a DISCLAIMER OF ALL
WARRANTIES, see the file, "license.txt," in this distribution.
-------------------------------------------------------------------------
This shows an example of multiple threads and syncing with a thread conditional
*/
/* define FLEXT_THREADS for thread usage. Flext must also have been compiled with that defined!
it's even better to define that as a compiler flag (-D FLEXT_THREADS) for all files of the
flext external
*/
#ifndef FLEXT_THREADS
#define FLEXT_THREADS
#endif
#include <flext.h>
#if !defined(FLEXT_VERSION) || (FLEXT_VERSION < 400)
#error You need at least flext version 0.4.0
#endif
class thread2:
public flext_base
{
FLEXT_HEADER(thread2,flext_base)
public:
thread2(int del);
protected:
void m_start(int st);
void m_stop();
void m_text();
void m_textout();
private:
FLEXT_THREAD_I(m_start) // define threaded callback for method m_start
FLEXT_CALLBACK(m_stop) // normal callback for m_stop
FLEXT_CALLBACK(m_text) // turn on console output
FLEXT_THREAD(m_textout) // text output
float delay;
volatile int count;
// caution: CodeWarrior seems to ignore volatile modifier!!
volatile bool stopit,running,blipping; // flags for running and stopping
// thread conditional for stop signal
ThrCond cond;
};
FLEXT_NEW_1("thread2",thread2,int)
thread2::thread2(int del):
delay(del/1000.f),
stopit(false),
running(false),blipping(false)
{
AddInAnything();
AddOutInt(2);
FLEXT_ADDMETHOD(0,m_start); // register start for integer numbers (floats in PD)
FLEXT_ADDMETHOD_(0,"text",m_text); // register m_text method for "text" tag
FLEXT_ADDMETHOD_(0,"stop",m_stop); // register m_text method for "stop" tag
}
void thread2::m_start(int st)
{
// if already running, just set back the counter
if(running) { count = st; return; }
running = true;
// loop until either the system exit flag or the "stopit" flag is set
for(count = st; !ShouldExit() && !stopit; ++count)
{
Sleep(delay);
ToOutInt(0,count); // output loop count
}
running = false; // change state flag
// cond.Lock(); // lock conditional
cond.Signal(); // signal changed flag to waiting "stop" method
// cond.Unlock(); // unlock conditional
}
void thread2::m_stop()
{
// cond.Lock(); // lock conditional
stopit = true; // set termination flag
while(*(&running) || *(&blipping)) // workaround for CodeWarrior (doesn't honor volatile modifier!)
{
cond.Wait(); // wait for signal by running threads
}
// --- Here, the threads should have stopped ---
stopit = false; // reset flag
// cond.Unlock(); // unlock conditional
}
void thread2::m_text()
{
FLEXT_CALLMETHOD(m_textout);
}
void thread2::m_textout()
{
if(blipping) return;
blipping = true;
while(!ShouldExit() && !stopit) {
post("%i",count);
Sleep(1.f);
}
blipping = false; // change state flag
// cond.Lock(); // lock conditional
cond.Signal(); // signal changed flag to waiting "stop" method
// cond.Unlock(); // unlock conditional
}
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