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root/cebix/SheepShaver/src/timer.cpp

Comparing SheepShaver/src/timer.cpp (file contents):
Revision 1.1 by cebix, 2002-02-04T16:58:13Z vs.
Revision 1.5 by gbeauche, 2005-03-15T20:46:50Z

#	Line 1 | Line 1
1		/*
2		*  timer.cpp - Time Manager emulation
3		*
4	<	*  SheepShaver (C) 1997-2002 Christian Bauer and Marc Hellwig
4	>	*  SheepShaver (C) 1997-2005 Christian Bauer and Marc Hellwig
5		*
6		*  This program is free software; you can redistribute it and/or modify
7		*  it under the terms of the GNU General Public License as published by
#	Line 28 | Line 28
28		#include "main.h"
29		#include "cpu_emulation.h"
30
31	+	#ifdef PRECISE_TIMING_POSIX
32	+	#include <pthread.h>
33	+	#include <semaphore.h>
34	+	#endif
35	+
36		#define DEBUG 0
37		#include "debug.h"
38
39
35	–	#if __BEOS__
36	–	#define PRECISE_TIMING 1
37	–	#else
38	–	#define PRECISE_TIMING 0
39	–	#endif
40	–
40		#define TM_QUEUE 0                      // Enable TMQueue management (doesn't work)
41
42
#	Line 61 | Line 60 | const int NUM_DESCS = 64;              // Maximum nu
60		static TMDesc desc[NUM_DESCS];
61
62		#if PRECISE_TIMING
63	+	#ifdef PRECISE_TIMING_BEOS
64		static thread_id timer_thread = -1;
65		static bool thread_active = true;
66	<	static volatile tm_time_t wakeup_time = 0x7fffffffffffffff;
66	>	static const tm_time_t wakeup_time_max = 0x7fffffffffffffff;
67	>	static volatile tm_time_t wakeup_time = wakeup_time_max;
68		static sem_id wakeup_time_sem = -1;
69		static int32 timer_func(void *arg);
70		#endif
71	+	#ifdef PRECISE_TIMING_POSIX
72	+	static pthread_t timer_thread;
73	+	static bool timer_thread_active = false;
74	+	static volatile bool timer_thread_cancel = false;
75	+	static tm_time_t wakeup_time_max = { 0x7fffffff, 999999999 };
76	+	static tm_time_t wakeup_time = wakeup_time_max;
77	+	static sem_t wakeup_time_sem;
78	+	static void *timer_func(void *arg);
79	+	#endif
80	+	#endif
81
82
83		/*
#	Line 143 | Line 154 | static void dequeue_tm(uint32 tm)
154
155
156		/*
157	+	*  Timer thread operations
158	+	*/
159	+
160	+	#ifdef PRECISE_TIMING_POSIX
161	+	const int SIGSUSPEND = SIGRTMIN + 6;
162	+	const int SIGRESUME  = SIGRTMIN + 7;
163	+	static struct sigaction sigsuspend_action;
164	+	static struct sigaction sigresume_action;
165	+
166	+	static int suspend_count = 0;
167	+	static pthread_mutex_t suspend_count_lock = PTHREAD_MUTEX_INITIALIZER;
168	+	static sem_t suspend_ack_sem;
169	+	static sigset_t suspend_handler_mask;
170	+
171	+	// Signal handler for suspended thread
172	+	static void sigsuspend_handler(int sig)
173	+	{
174	+	sem_post(&suspend_ack_sem);
175	+	sigsuspend(&suspend_handler_mask);
176	+	}
177	+
178	+	// Signal handler for resumed thread
179	+	static void sigresume_handler(int sig)
180	+	{
181	+	/* simply trigger a signal to stop clock_nanosleep() */
182	+	}
183	+
184	+	// Initialize timer thread
185	+	static bool timer_thread_init(void)
186	+	{
187	+	// Install suspend signal handler
188	+	sigfillset(&sigsuspend_action.sa_mask);
189	+	sigsuspend_action.sa_handler = sigsuspend_handler;
190	+	sigsuspend_action.sa_flags = SA_RESTART;
191	+	#ifdef HAVE_SIGNAL_SA_RESTORER
192	+	sigsuspend_action.sa_restorer = NULL;
193	+	#endif
194	+	if (sigaction(SIGSUSPEND, &sigsuspend_action, NULL) < 0)
195	+	return false;
196	+
197	+	// Install resume signal handler
198	+	sigfillset(&sigresume_action.sa_mask);
199	+	sigresume_action.sa_handler = sigresume_handler;
200	+	sigresume_action.sa_flags = SA_RESTART;
201	+	#ifdef HAVE_SIGNAL_SA_RESTORER
202	+	sigresume_action.sa_restorer = NULL;
203	+	#endif
204	+	if (sigaction(SIGRESUME, &sigresume_action, NULL) < 0)
205	+	return false;
206	+
207	+	// Initialize semaphore
208	+	if (sem_init(&suspend_ack_sem, 0, 0) < 0)
209	+	return false;
210	+
211	+	// Initialize suspend_handler_mask, it excludes SIGRESUME
212	+	if (sigfillset(&suspend_handler_mask) != 0)
213	+	return false;
214	+	if (sigdelset(&suspend_handler_mask, SIGRESUME) != 0)
215	+	return false;
216	+
217	+	// Create thread in running state
218	+	suspend_count = 0;
219	+	return (pthread_create(&timer_thread, NULL, timer_func, NULL) == 0);
220	+	}
221	+
222	+	// Kill timer thread
223	+	static void timer_thread_kill(void)
224	+	{
225	+	timer_thread_cancel = true;
226	+	#ifdef HAVE_PTHREAD_CANCEL
227	+	pthread_cancel(timer_thread);
228	+	#endif
229	+	pthread_join(timer_thread, NULL);
230	+	}
231	+
232	+	// Suspend timer thread
233	+	static void timer_thread_suspend(void)
234	+	{
235	+	pthread_mutex_lock(&suspend_count_lock);
236	+	if (suspend_count == 0) {
237	+	suspend_count ++;
238	+	if (pthread_kill(timer_thread, SIGSUSPEND) == 0)
239	+	sem_wait(&suspend_ack_sem);
240	+	}
241	+	pthread_mutex_unlock(&suspend_count_lock);
242	+	}
243	+
244	+	// Resume timer thread
245	+	static void timer_thread_resume(void)
246	+	{
247	+	pthread_mutex_lock(&suspend_count_lock);
248	+	assert(suspend_count > 0);
249	+	if (suspend_count == 1) {
250	+	suspend_count = 0;
251	+	pthread_kill(timer_thread, SIGRESUME);
252	+	}
253	+	pthread_mutex_unlock(&suspend_count_lock);
254	+	}
255	+	#endif
256	+
257	+
258	+	/*
259		*  Initialize Time Manager
260		*/
261
#	Line 154 | Line 267 | void TimerInit(void)
267
268		#if PRECISE_TIMING
269		// Start timer thread
270	+	#ifdef PRECISE_TIMING_BEOS
271		wakeup_time_sem = create_sem(1, "Wakeup Time");
272		timer_thread = spawn_thread(timer_func, "Time Manager", B_REAL_TIME_PRIORITY, NULL);
273		resume_thread(timer_thread);
274		#endif
275	+	#ifdef PRECISE_TIMING_POSIX
276	+	sem_init(&wakeup_time_sem, 0, 1);
277	+	timer_thread_active = timer_thread_init();
278	+	#endif
279	+	#endif
280		}
281
282
#	Line 170 | Line 289 | void TimerExit(void)
289		#if PRECISE_TIMING
290		// Quit timer thread
291		if (timer_thread > 0) {
292	+	#ifdef PRECISE_TIMING_BEOS
293		status_t l;
294		thread_active = false;
295		suspend_thread(timer_thread);
296		resume_thread(timer_thread);
297		wait_for_thread(timer_thread, &l);
298		delete_sem(wakeup_time_sem);
299	+	#endif
300	+	#ifdef PRECISE_TIMING_POSIX
301	+	timer_thread_kill();
302	+	sem_destroy(&wakeup_time_sem);
303	+	#endif
304		}
305		#endif
306		}
#	Line 228 | Line 353 | int16 RmvTime(uint32 tm)
353		}
354
355		// Task active?
356	<	#if PRECISE_TIMING
356	>	#if PRECISE_TIMING_BEOS
357		while (acquire_sem(wakeup_time_sem) == B_INTERRUPTED) ;
358		suspend_thread(timer_thread);
359		#endif
360	+	#if PRECISE_TIMING_POSIX
361	+	sem_wait(&wakeup_time_sem);
362	+	timer_thread_suspend();
363	+	#endif
364		if (ReadMacInt16(tm + qType) & 0x8000) {
365
366		// Yes, make task inactive and remove it from the Time Manager queue
#	Line 239 | Line 368 | int16 RmvTime(uint32 tm)
368		dequeue_tm(tm);
369		#if PRECISE_TIMING
370		// Look for next task to be called and set wakeup_time
371	<	wakeup_time = 0x7fffffffffffffff;
371	>	wakeup_time = wakeup_time_max;
372		for (int j=0; j<NUM_DESCS; j++) {
373		if (desc[j].in_use && (ReadMacInt16(desc[j].task + qType) & 0x8000))
374	<	if (desc[j].wakeup < wakeup_time)
374	>	if (timer_cmp_time(desc[j].wakeup, wakeup_time) < 0)
375		wakeup_time = desc[j].wakeup;
376		}
377		#endif
#	Line 255 | Line 384 | int16 RmvTime(uint32 tm)
384		} else
385		WriteMacInt32(tm + tmCount, 0);
386		D(bug(" tmCount %ld\n", ReadMacInt32(tm + tmCount)));
387	<	#if PRECISE_TIMING
387	>	#if PRECISE_TIMING_BEOS
388		release_sem(wakeup_time_sem);
389		thread_info info;
390		do {
#	Line 263 | Line 392 | int16 RmvTime(uint32 tm)
392		get_thread_info(timer_thread, &info);
393		} while (info.state == B_THREAD_SUSPENDED);     // Sometimes, resume_thread() doesn't work (BeOS bug?)
394		#endif
395	+	#if PRECISE_TIMING_POSIX
396	+	sem_post(&wakeup_time_sem);
397	+	timer_thread_resume();
398	+	assert(suspend_count == 0);
399	+	#endif
400
401		// Free descriptor
402		free_desc(i);
#	Line 327 | Line 461 | int16 PrimeTime(uint32 tm, int32 time)
461		}
462
463		// Make task active and enqueue it in the Time Manager queue
464	<	#if PRECISE_TIMING
464	>	#if PRECISE_TIMING_BEOS
465		while (acquire_sem(wakeup_time_sem) == B_INTERRUPTED) ;
466		suspend_thread(timer_thread);
467		#endif
468	+	#if PRECISE_TIMING_POSIX
469	+	sem_wait(&wakeup_time_sem);
470	+	timer_thread_suspend();
471	+	#endif
472		WriteMacInt16(tm + qType, ReadMacInt16(tm + qType) | 0x8000);
473		enqueue_tm(tm);
474		#if PRECISE_TIMING
475		// Look for next task to be called and set wakeup_time
476	<	wakeup_time = 0x7fffffffffffffff;
476	>	wakeup_time = wakeup_time_max;
477		for (int j=0; j<NUM_DESCS; j++) {
478		if (desc[j].in_use && (ReadMacInt16(desc[j].task + qType) & 0x8000))
479	<	if (desc[j].wakeup < wakeup_time)
479	>	if (timer_cmp_time(desc[j].wakeup, wakeup_time) < 0)
480		wakeup_time = desc[j].wakeup;
481		}
482	+	#ifdef PRECISE_TIMING_BEOS
483		release_sem(wakeup_time_sem);
484		thread_info info;
485		do {
#	Line 348 | Line 487 | int16 PrimeTime(uint32 tm, int32 time)
487		get_thread_info(timer_thread, &info);
488		} while (info.state == B_THREAD_SUSPENDED);     // Sometimes, resume_thread() doesn't work (BeOS bug?)
489		#endif
490	+	#ifdef PRECISE_TIMING_POSIX
491	+	sem_post(&wakeup_time_sem);
492	+	timer_thread_resume();
493	+	assert(suspend_count == 0);
494	+	#endif
495	+	#endif
496		return 0;
497		}
498
499
355	–	#if PRECISE_TIMING
500		/*
501		*  Time Manager thread
502		*/
503
504	+	#ifdef PRECISE_TIMING_BEOS
505		static int32 timer_func(void *arg)
506		{
507		while (thread_active) {
#	Line 378 | Line 523 | static int32 timer_func(void *arg)
523		}
524		#endif
525
526	+	#ifdef PRECISE_TIMING_POSIX
527	+	static void *timer_func(void *arg)
528	+	{
529	+	while (!timer_thread_cancel) {
530	+
531	+	// Wait until time specified by wakeup_time
532	+	clock_nanosleep(CLOCK_REALTIME, TIMER_ABSTIME, &wakeup_time, NULL);
533	+
534	+	sem_wait(&wakeup_time_sem);
535	+	tm_time_t system_time;
536	+	timer_current_time(system_time);
537	+	if (timer_cmp_time(wakeup_time, system_time) < 0) {
538	+
539	+	// Timer expired, trigger interrupt
540	+	wakeup_time = wakeup_time_max;
541	+	SetInterruptFlag(INTFLAG_TIMER);
542	+	TriggerInterrupt();
543	+	}
544	+	sem_post(&wakeup_time_sem);
545	+	}
546	+	return NULL;
547	+	}
548	+	#endif
549	+
550
551		/*
552		*  Timer interrupt function (executed as part of 60Hz interrupt)
#	Line 414 | Line 583 | void TimerInterrupt(void)
583
584		#if PRECISE_TIMING
585		// Look for next task to be called and set wakeup_time
586	+	#if PRECISE_TIMING_BEOS
587		while (acquire_sem(wakeup_time_sem) == B_INTERRUPTED) ;
588		suspend_thread(timer_thread);
589	<	wakeup_time = 0x7fffffffffffffff;
589	>	#endif
590	>	#if PRECISE_TIMING_POSIX
591	>	sem_wait(&wakeup_time_sem);
592	>	timer_thread_suspend();
593	>	#endif
594	>	wakeup_time = wakeup_time_max;
595		for (int j=0; j<NUM_DESCS; j++) {
596		if (desc[j].in_use && (ReadMacInt16(desc[j].task + qType) & 0x8000))
597	<	if (desc[j].wakeup < wakeup_time)
597	>	if (timer_cmp_time(desc[j].wakeup, wakeup_time) < 0)
598		wakeup_time = desc[j].wakeup;
599		}
600	+	#if PRECISE_TIMING_BEOS
601		release_sem(wakeup_time_sem);
602		thread_info info;
603		do {
#	Line 429 | Line 605 | void TimerInterrupt(void)
605		get_thread_info(timer_thread, &info);
606		} while (info.state == B_THREAD_SUSPENDED);     // Sometimes, resume_thread() doesn't work (BeOS bug?)
607		#endif
608	+	#if PRECISE_TIMING_POSIX
609	+	sem_post(&wakeup_time_sem);
610	+	timer_thread_resume();
611	+	assert(suspend_count == 0);
612	+	#endif
613	+	#endif
614		}

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