aboutsummaryrefslogtreecommitdiff
path: root/externals/grill/flext/source/flthr.cpp
blob: fe70dfdd043efb2d54290a5cc0114aeca966d5c2 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
/* 

flext - C++ layer for Max/MSP and pd (pure data) externals

Copyright (c) 2001-2003 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.  

*/

/*! \file flthr.cpp
    \brief Implementation of the flext thread functionality.
*/
 
#include "flext.h"
#include "flinternal.h"

#ifdef FLEXT_THREADS


#include <time.h>

#if FLEXT_OSAPI == FLEXT_OSAPI_UNIX_POSIX || FLEXT_OSAPI == FLEXT_OSAPI_WIN_POSIX
#include <sys/time.h>
#include <unistd.h>
#elif FLEXT_OS == FLEXT_OS_WIN
#include <sys/timeb.h>
#endif

#if FLEXT_THREADS == FLEXT_THR_WIN32 && WINVER < 0x0500
#error WIN32 threads need Windows SDK version >= 0x500
#endif


#include <errno.h>

//! Thread id of system thread
flext::thrid_t flext::thrid = 0;

//! Thread id of helper thread
flext::thrid_t flext::thrhelpid = 0;

static flext::thr_entry *thrhead = NULL,*thrtail = NULL;
static flext::ThrMutex tlmutex;

//! Helper thread should terminate
static bool thrhelpexit = false;

//! Helper thread conditional
static flext::ThrCond *thrhelpcond = NULL;


flext::thrid_t flext::GetSysThreadId() { return thrid; }


void flext::LaunchHelper(thr_entry *e)
{
    e->thrid = GetThreadId();
    e->meth(e->params);
}

//! Start helper thread
bool flext::StartHelper()
{
	if(thrhelpid) return true;
	
	if(!thrid) {
		// system thread has not been set
		ERRINTERNAL();
		return false;
	}

	bool ok = false;
#if FLEXT_THREADS == FLEXT_THR_POSIX
	pthread_attr_t attr;
	pthread_attr_init(&attr);
	pthread_attr_setdetachstate(&attr,PTHREAD_CREATE_DETACHED);

	thrhelpexit = false;
	ok = pthread_create (&thrhelpid,&attr,(void *(*)(void *))ThrHelper,NULL) == 0;
#elif FLEXT_THREADS == FLEXT_THR_MP
	if(!MPLibraryIsLoaded())
		error("Thread library is not loaded");
	else {
		OSStatus ret = MPCreateTask((TaskProc)ThrHelper,NULL,0,0,0,0,0,&thrhelpid);
		ok = ret == noErr;
	}
#elif FLEXT_THREADS == FLEXT_THR_WIN32
    ok = _beginthread(ThrHelper,0,NULL) >= 0;
#else
#error
#endif
	if(!ok)
		error("flext - Could not launch helper thread!"); 
    else {
        // now we have to wait for thread helper to initialize
        while(!thrhelpid || !thrhelpcond) Sleep(0.001);

        // we are ready for threading now!
    }
    
#if FLEXT_THREADS == FLEXT_THR_POSIX
	pthread_attr_destroy(&attr);
#endif    
	return ok;
}

#if 0
/*! \brief Stop helper thread
	\note Never called!
*/
bool flext::StopHelper()
{
	thrhelpexit = true;
	if(thrhelpcond) thrhelpcond->Signal();
}
#endif

//! Static helper thread function
void flext::ThrHelper(void *)
{
    thrhelpid = GetThreadId();

#if FLEXT_THREADS == FLEXT_THR_POSIX
	// set prototype thread attributes
	pthread_attr_t attr;
	pthread_attr_init(&attr);
	pthread_attr_setdetachstate(&attr,PTHREAD_CREATE_DETACHED);
#endif

//	post("Helper thread started");

	// set thread priority one point below normal
	// so thread construction won't disturb real-time audio
	RelPriority(-1);

	thrhelpcond = new ThrCond;

	// helper loop
	for(;;) {
//		post("Helper loop");

		thrhelpcond->Wait();
		if(thrhelpexit) break;

//		post("Helper signalled");
		tlmutex.Lock();

//		post("Helper after lock");

		// start all inactive threads in queue
		thr_entry *prv = NULL,*ti;
		for(ti = thrhead; ti; prv = ti,ti = ti->nxt) {
			if(!ti->active) {
				bool ok;
				
//				post("Helper start thread");
#if FLEXT_THREADS == FLEXT_THR_POSIX
                thrid_t dummy;
				ok = pthread_create (&dummy,&attr,(void *(*)(void *))LaunchHelper,ti) == 0;
#elif FLEXT_THREADS == FLEXT_THR_MP
                thrid_t dummy;
				ok = MPCreateTask((TaskProc)LaunchHelper,ti,0,0,0,0,0,&dummy) == noErr;
#elif FLEXT_THREADS == FLEXT_THR_WIN32
				ok = _beginthread((void (*)(void *))LaunchHelper,0,ti) >= 0;
#else
#error
#endif
				if(!ok) { 
					error("flext - Could not launch thread!"); 
					
					// delete from queue
					if(prv) 
						prv->nxt = ti->nxt;
					else 
						thrhead = ti->nxt;
					if(thrtail == ti) thrtail = prv;

					ti->nxt = NULL;
					delete ti;
				}
				else {
//					post("Helper thread ok");

					// set active flag
					ti->active = true;
				}
			}
		}

		tlmutex.Unlock();
	}

	delete thrhelpcond;
	thrhelpcond = NULL;
	
#if FLEXT_THREADS == FLEXT_THR_POSIX
	pthread_attr_destroy(&attr);
#endif
}


bool flext::LaunchThread(void (*meth)(thr_params *p),thr_params *p)
{
#ifdef FLEXT_DEBUG
	if(!thrhelpcond) {
		ERRINTERNAL(); 
		return false;
	}
#endif

//	post("make threads");

	tlmutex.Lock();

	// make an entry into thread list
	thr_entry *nt = new thr_entry(meth,p);
	if(thrtail) thrtail->nxt = nt; 
	else thrhead = nt;
	thrtail = nt;

	tlmutex.Unlock();

//	post("signal helper");

	// signal thread helper
	thrhelpcond->Signal();

	return true;
}

bool flext::StopThread(void (*meth)(thr_params *p),thr_params *p,bool wait)
{
#ifdef FLEXT_DEBUG
	if(!thrhelpcond) {
		ERRINTERNAL(); 
		return false;
	}
#endif

	int found = 0;

	tlmutex.Lock();
	for(thr_entry *ti = thrhead; ti; ti = ti->nxt)
		// set shouldexit if meth and params match
		if(ti->meth == meth && ti->params == p) { ti->shouldexit = true; found++; }
	tlmutex.Unlock();

	if(found) {
		// signal thread helper
		thrhelpcond->Signal();
#if 0
        // ######################
        // i don't think we need to wait for a single thread to stop
        // ######################
		int cnt = 0;
		for(int wi = 0; wi < 100; ++wi) {
			// lock and count this object's threads
			cnt = 0;
			tlmutex.Lock();
			for(thr_entry *t = thrhead; t; t = t->nxt)
				if(t->meth == meth && t->params == p) ++cnt;
			tlmutex.Unlock();

			// if no threads are remaining, we are done
			if(!cnt) break;

			// Wait
			Sleep(0.01f);
		}

		return cnt == 0;
#endif
        return true;
	}
	else
		return false;
}

bool flext_base::ShouldExit() const 
{
	bool ret = true;

	tlmutex.Lock();
	for(thr_entry *ti = thrhead; ti; ti = ti->nxt)
		if(ti->Is()) { ret = ti->shouldexit; break; }
	tlmutex.Unlock();

	// thread was not found -> EXIT!!!
	return ret;
}

bool flext::PushThread()
{
	// set priority of newly created thread one point below the system thread's
	RelPriority(-1);
	return true;
}

void flext::PopThread()
{
	tlmutex.Lock();

//	post("Pop thread");

	thr_entry *prv = NULL,*ti;
	for(ti = thrhead; ti; prv = ti,ti = ti->nxt)
		if(ti->Is()) break;

	if(ti) {
		if(prv) 
			prv->nxt = ti->nxt;
		else 
			thrhead = ti->nxt;
		if(thrtail == ti) thrtail = prv;

		ti->nxt = NULL;
		delete ti;
	}
	else {
#ifdef FLEXT_DEBUG
		post("flext - INTERNAL ERROR: Thread not found!");
#endif
	}
	
	tlmutex.Unlock();
}

//! Terminate all object threads
bool flext_base::StopThreads()
{
	thr_entry *t;

	// signal termination for all object's threads
	tlmutex.Lock();
	for(t = thrhead; t; t = t->nxt) {
		if(t->This() == this) t->shouldexit = true;
	}
	tlmutex.Unlock();

	// TODO: maybe there should be a thread conditional for every thread so that it can be signalled efficiently

	// wait for thread termination (1 second max.)
	int cnt;
	for(int wi = 0; wi < 100; ++wi) {
        // lock and count this object's threads
		tlmutex.Lock();
		for(cnt = 0,t = thrhead; t; t = t->nxt)
			if(t->This() == this) ++cnt;
		tlmutex.Unlock();

        // if no threads are remaining, we are done
		if(!cnt) break;

        // Wait
		Sleep(0.01f);
	}

	if(cnt) {
#ifdef FLEXT_DEBUG
		post("flext - doing hard thread termination");
#endif
	
		// --- all object threads have terminated by now -------
		tlmutex.Lock();

		// timeout -> hard termination
		for(t = thrhead; t; )
			if(t->This() == this) {
		#if FLEXT_THREADS == FLEXT_THR_POSIX
				if(pthread_cancel(t->thrid)) post("%s - Thread could not be terminated!",thisName());
		#elif FLEXT_THREADS == FLEXT_THR_MP
				MPTerminateTask(t->thrid,0);
				// here, we should use a task queue to check whether the task has really terminated!!
		#elif FLEXT_THREADS == FLEXT_THR_WIN32
                // can't use the c library function _endthread.. memory leaks will occur
                HANDLE hnd = OpenThread(THREAD_ALL_ACCESS,TRUE,t->thrid);
                TerminateThread(hnd,0);
		#else
		#error
		#endif
				thr_entry *tn = t->nxt;
				t->nxt = NULL; delete t;
				t = tn;
			}
			else t = t->nxt;
        thrhead = NULL;

		tlmutex.Unlock();
	}
	
//	post("All threads have terminated");
	
	return true;
}

bool flext::RelPriority(int dp,thrid_t ref,thrid_t id)
{
#if FLEXT_THREADS == FLEXT_THR_POSIX
	sched_param parm;
	int policy;
	if(pthread_getschedparam(ref,&policy,&parm) < 0) {
#ifdef FLEXT_DEBUG
		post("flext - failed to get thread priority");
#endif
		return false;
	}
	else {
		parm.sched_priority += dp;

		// MSVC++ 6 produces wrong code with the following lines!!!
//		int schmin = sched_get_priority_min(policy);
//		int schmax = sched_get_priority_max(policy);

		if(parm.sched_priority < sched_get_priority_min(policy)) {
#ifdef FLEXT_DEBUG		
			post("flext - minimum thread priority reached");
#endif
			parm.sched_priority = sched_get_priority_min(policy);
		}
		else if(parm.sched_priority > sched_get_priority_max(policy)) {
#ifdef FLEXT_DEBUG		
			post("flext - maximum thread priority reached");
#endif
			parm.sched_priority = sched_get_priority_max(policy);
		}
		
		if(pthread_setschedparam(id,policy,&parm) < 0) {
#ifdef FLEXT_DEBUG		
			post("flext - failed to change thread priority");
#endif
			return false;
		}
	}
	return true;

#elif FLEXT_THREADS == FLEXT_THR_WIN32
    HANDLE href = OpenThread(THREAD_ALL_ACCESS,TRUE,ref);
    HANDLE hid = OpenThread(THREAD_ALL_ACCESS,TRUE,id);
    int pr = GetThreadPriority(href);

    if(pr == THREAD_PRIORITY_ERROR_RETURN) {
#ifdef FLEXT_DEBUG
		post("flext - failed to get thread priority");
#endif
		return false;
	}

    pr += dp;
	if(pr < THREAD_PRIORITY_IDLE) {
#ifdef FLEXT_DEBUG		
		post("flext - minimum thread priority reached");
#endif
		pr = THREAD_PRIORITY_IDLE;
	}
	else if(pr > THREAD_PRIORITY_TIME_CRITICAL) {
#ifdef FLEXT_DEBUG		
		post("flext - maximum thread priority reached");
#endif
		pr = THREAD_PRIORITY_TIME_CRITICAL;
	}
	
	if(SetThreadPriority(hid,pr) == 0) {
#ifdef FLEXT_DEBUG		
		post("flext - failed to change thread priority");
#endif
		return false;
	}
    return true;

#elif FLEXT_THREADS == FLEXT_THR_MP
	thr_entry *t;
	for(t = thrhead; t && t->Id() != id; t = t->nxt) {}
	if(t) {
		// thread found in list
		int w = GetPriority(id);
		if(dp < 0) w /= 1<<(-dp);
		else w *= 1<<dp;
		if(w < 1) {
	#ifdef FLEXT_DEBUG		
			post("flext - minimum thread priority reached");
	#endif
			w = 1;
		}
		else if(w > 10000) {
	#ifdef FLEXT_DEBUG		
			post("flext - maximum thread priority reached");
	#endif
			w = 10000;
		}
		t->weight = w;
		return MPSetTaskWeight(id,w) == noErr;
	}
	else return false;
#else
#error
#endif
}


int flext::GetPriority(thrid_t id)
{
#if FLEXT_THREADS == FLEXT_THR_POSIX
	sched_param parm;
	int policy;
	if(pthread_getschedparam(id,&policy,&parm) < 0) {
#ifdef FLEXT_DEBUG
		post("flext - failed to get parms");
#endif
		return -1;
	}
	return parm.sched_priority;

#elif FLEXT_THREADS == FLEXT_THR_WIN32
    HANDLE hid = OpenThread(THREAD_ALL_ACCESS,TRUE,id);
    int pr = GetThreadPriority(hid);

    if(pr == THREAD_PRIORITY_ERROR_RETURN) {
#ifdef FLEXT_DEBUG
		post("flext - failed to get thread priority");
#endif
		return -1;
	}
    return pr;

#elif FLEXT_THREADS == FLEXT_THR_MP
	thr_entry *t;
	for(t = thrhead; t && t->Id() != id; t = t->nxt) {}
	return t?t->weight:-1;
#else
#error
#endif
}


bool flext::SetPriority(int p,thrid_t id)
{
#if FLEXT_THREADS == FLEXT_THR_POSIX
	sched_param parm;
	int policy;
	if(pthread_getschedparam(id,&policy,&parm) < 0) {
#ifdef FLEXT_DEBUG
		post("flext - failed to get parms");
#endif
		return false;
	}
	else {
		parm.sched_priority = p;
		if(pthread_setschedparam(id,policy,&parm) < 0) {
#ifdef FLEXT_DEBUG		
			post("flext - failed to change priority");
#endif
			return false;
		}
	}
	return true;

#elif FLEXT_THREADS == FLEXT_THR_WIN32
    HANDLE hid = OpenThread(THREAD_ALL_ACCESS,TRUE,id);
	if(SetThreadPriority(hid,p) == 0) {
#ifdef FLEXT_DEBUG		
		post("flext - failed to change thread priority");
#endif
		return false;
	}
    return true;

#elif FLEXT_THREADS == FLEXT_THR_MP
	thr_entry *t;
	for(t = thrhead; t && t->Id() != id; t = t->nxt) {}
	if(t)
		return MPSetTaskWeight(id,t->weight = p) == noErr;
	else
		return false;
#else
#error
#endif
}


flext_base::thr_params::thr_params(int n): cl(NULL),var(new _data[n]) {}
flext_base::thr_params::~thr_params() { if(var) delete[] var; }

void flext_base::thr_params::set_any(const t_symbol *s,int argc,const t_atom *argv) { var[0]._any.args = new AtomAnything(s,argc,argv); }
void flext_base::thr_params::set_list(int argc,const t_atom *argv) { var[0]._list.args = new AtomList(argc,argv); }


flext_base::thr_entry::thr_entry(void (*m)(thr_params *),thr_params *p,thrid_t id): 
	th(p?p->cl:NULL),meth(m),params(p),thrid(id),
	active(false),shouldexit(false),
#if FLEXT_THREADS == FLEXT_THR_MP
	weight(100), // MP default weight
#endif
	nxt(NULL) 
{}



#if FLEXT_THREADS == FLEXT_THR_POSIX
bool flext::ThrCond::Wait() { 
	Lock();
	bool ret = pthread_cond_wait(&cond,&mutex) == 0; 
	Unlock();
	return ret;
}

bool flext::ThrCond::TimedWait(double ftm) 
{ 
	timespec tm; 
#if FLEXT_OS == FLEXT_OS_WIN && FLEXT_OSAPI == FLEXT_OSAPI_WIN_NATIVE
#ifdef _MSC_VER
	_timeb tmb;
	_ftime(&tmb);
#else
	timeb tmb;
	ftime(&tmb);
#endif
	tm.tv_nsec = tmb.millitm*1000000;
	tm.tv_sec = tmb.time; 
#else // POSIX
#if 0 // find out when the following is defined
	clock_gettime(CLOCK_REALTIME,tm);
#else
	struct timeval tp;
	gettimeofday(&tp, NULL);
	tm.tv_nsec = tp.tv_usec*1000;
	tm.tv_sec = tp.tv_sec;
#endif
#endif

	tm.tv_nsec += (long)((ftm-(long)ftm)*1.e9);
	long nns = tm.tv_nsec%1000000000;
	tm.tv_sec += (long)ftm+(tm.tv_nsec-nns)/1000000000; 
	tm.tv_nsec = nns;

	Lock();
	bool ret = pthread_cond_timedwait(&cond,&mutex,&tm) == 0; 
	Unlock();
	return ret;
}
#endif


#endif // FLEXT_THREADS