src/Unix/timer_unix.cpp

/*
 *  timer_unix.cpp - Time Manager emulation, Unix specific stuff
 *
 *  Basilisk II (C) 1997-2005 Christian Bauer
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include "sysdeps.h"
#include "macos_util.h"
#include "timer.h"

#include <errno.h>

#define DEBUG 0
#include "debug.h"

// For NetBSD with broken pthreads headers
#ifndef CLOCK_REALTIME
#define CLOCK_REALTIME 0
#endif


/*
 *  Return microseconds since boot (64 bit)
 */

void Microseconds(uint32 &hi, uint32 &lo)
{
        D(bug("Microseconds\n"));
#ifdef HAVE_CLOCK_GETTIME
        struct timespec t;
        clock_gettime(CLOCK_REALTIME, &t);
        uint64 tl = (uint64)t.tv_sec * 1000000 + t.tv_nsec / 1000;
#else
        struct timeval t;
        gettimeofday(&t, NULL);
        uint64 tl = (uint64)t.tv_sec * 1000000 + t.tv_usec;
#endif
        hi = tl >> 32;
        lo = tl;
}


/*
 *  Return local date/time in Mac format (seconds since 1.1.1904)
 */

uint32 TimerDateTime(void)
{
        return TimeToMacTime(time(NULL));
}


/*
 *  Get current time
 */

void timer_current_time(tm_time_t &t)
{
#ifdef HAVE_CLOCK_GETTIME
        clock_gettime(CLOCK_REALTIME, &t);
#else
        gettimeofday(&t, NULL);
#endif
}


/*
 *  Add times
 */

void timer_add_time(tm_time_t &res, tm_time_t a, tm_time_t b)
{
#ifdef HAVE_CLOCK_GETTIME
        res.tv_sec = a.tv_sec + b.tv_sec;
        res.tv_nsec = a.tv_nsec + b.tv_nsec;
        if (res.tv_nsec >= 1000000000) {
                res.tv_sec++;
                res.tv_nsec -= 1000000000;
        }
#else
        res.tv_sec = a.tv_sec + b.tv_sec;
        res.tv_usec = a.tv_usec + b.tv_usec;
        if (res.tv_usec >= 1000000) {
                res.tv_sec++;
                res.tv_usec -= 1000000;
        }
#endif
}


/*
 *  Subtract times
 */

void timer_sub_time(tm_time_t &res, tm_time_t a, tm_time_t b)
{
#ifdef HAVE_CLOCK_GETTIME
        res.tv_sec = a.tv_sec - b.tv_sec;
        res.tv_nsec = a.tv_nsec - b.tv_nsec;
        if (res.tv_nsec < 0) {
                res.tv_sec--;
                res.tv_nsec += 1000000000;
        }
#else
        res.tv_sec = a.tv_sec - b.tv_sec;
        res.tv_usec = a.tv_usec - b.tv_usec;
        if (res.tv_usec < 0) {
                res.tv_sec--;
                res.tv_usec += 1000000;
        }
#endif
}


/*
 *  Compare times (<0: a < b, =0: a = b, >0: a > b)
 */

int timer_cmp_time(tm_time_t a, tm_time_t b)
{
#ifdef HAVE_CLOCK_GETTIME
        if (a.tv_sec == b.tv_sec)
                return a.tv_nsec - b.tv_nsec;
        else
                return a.tv_sec - b.tv_sec;
#else
        if (a.tv_sec == b.tv_sec)
                return a.tv_usec - b.tv_usec;
        else
                return a.tv_sec - b.tv_sec;
#endif
}


/*
 *  Convert Mac time value (>0: microseconds, <0: microseconds) to tm_time_t
 */

void timer_mac2host_time(tm_time_t &res, int32 mactime)
{
#ifdef HAVE_CLOCK_GETTIME
        if (mactime > 0) {
                // Time in milliseconds
                res.tv_sec = mactime / 1000;
                res.tv_nsec = (mactime % 1000) * 1000000;
        } else {
                // Time in negative microseconds
                res.tv_sec = -mactime / 1000000;
                res.tv_nsec = (-mactime % 1000000) * 1000;
        }
#else
        if (mactime > 0) {
                // Time in milliseconds
                res.tv_sec = mactime / 1000;
                res.tv_usec = (mactime % 1000) * 1000;
        } else {
                // Time in negative microseconds
                res.tv_sec = -mactime / 1000000;
                res.tv_usec = -mactime % 1000000;
        }
#endif
}


/*
 *  Convert positive tm_time_t to Mac time value (>0: microseconds, <0: microseconds)
 *  A negative input value for hosttime results in a zero return value
 *  As long as the microseconds value fits in 32 bit, it must not be converted to milliseconds!
 */

int32 timer_host2mac_time(tm_time_t hosttime)
{
        if (hosttime.tv_sec < 0)
                return 0;
        else {
#ifdef HAVE_CLOCK_GETTIME
                uint64 t = (uint64)hosttime.tv_sec * 1000000 + hosttime.tv_nsec / 1000;
#else
                uint64 t = (uint64)hosttime.tv_sec * 1000000 + hosttime.tv_usec;
#endif
                if (t > 0x7fffffff)
                        return t / 1000;        // Time in milliseconds
                else
                        return -t;                      // Time in negative microseconds
        }
}


/*
 *  Get current value of microsecond timer
 */

uint64 GetTicks_usec(void)
{
#ifdef HAVE_CLOCK_GETTIME
        struct timespec t;
        clock_gettime(CLOCK_REALTIME, &t);
        return (uint64)t.tv_sec * 1000000 + t.tv_nsec / 1000;
#else
        struct timeval t;
        gettimeofday(&t, NULL);
        return (uint64)t.tv_sec * 1000000 + t.tv_usec;
#endif
}


/*
 *  Delay by specified number of microseconds (<1 second)
 *  (adapted from SDL_Delay() source; this function is designed to provide
 *  the highest accuracy possible)
 */

#if defined(linux)
// Linux select() changes its timeout parameter upon return to contain
// the remaining time. Most other unixen leave it unchanged or undefined.
#define SELECT_SETS_REMAINING
#elif defined(__FreeBSD__) || defined(__sun__) || (defined(__MACH__) && defined(__APPLE__))
#define USE_NANOSLEEP
#elif defined(HAVE_PTHREADS) && defined(sgi)
// SGI pthreads has a bug when using pthreads+signals+nanosleep,
// so instead of using nanosleep, wait on a CV which is never signalled.
#include <pthread.h>
#define USE_COND_TIMEDWAIT
#endif

void Delay_usec(uint32 usec)
{
        int was_error;

#if defined(USE_NANOSLEEP)
        struct timespec elapsed, tv;
#elif defined(USE_COND_TIMEDWAIT)
        // Use a local mutex and cv, so threads remain independent
        pthread_cond_t delay_cond = PTHREAD_COND_INITIALIZER;
        pthread_mutex_t delay_mutex = PTHREAD_MUTEX_INITIALIZER;
        struct timespec elapsed;
        uint64 future;
#else
        struct timeval tv;
#ifndef SELECT_SETS_REMAINING
        uint64 then, now, elapsed;
#endif
#endif

        // Set the timeout interval - Linux only needs to do this once
#if defined(SELECT_SETS_REMAINING)
    tv.tv_sec = 0;
    tv.tv_usec = usec;
#elif defined(USE_NANOSLEEP)
    elapsed.tv_sec = 0;
    elapsed.tv_nsec = usec * 1000;
#elif defined(USE_COND_TIMEDWAIT)
        future = GetTicks_usec() + usec;
        elapsed.tv_sec = future / 1000000;
        elapsed.tv_nsec = (future % 1000000) * 1000;
#else
    then = GetTicks_usec();
#endif

        do {
                errno = 0;
#if defined(USE_NANOSLEEP)
                tv.tv_sec = elapsed.tv_sec;
                tv.tv_nsec = elapsed.tv_nsec;
                was_error = nanosleep(&tv, &elapsed);
#elif defined(USE_COND_TIMEDWAIT)
                was_error = pthread_mutex_lock(&delay_mutex);
                was_error = pthread_cond_timedwait(&delay_cond, &delay_mutex, &elapsed);
                was_error = pthread_mutex_unlock(&delay_mutex);
#else
#ifndef SELECT_SETS_REMAINING
                // Calculate the time interval left (in case of interrupt)
                now = GetTicks_usec();
                elapsed = now - then;
                then = now;
                if (elapsed >= usec)
                        break;
                usec -= elapsed;
                tv.tv_sec = 0;
                tv.tv_usec = usec;
#endif
                was_error = select(0, NULL, NULL, NULL, &tv);
#endif
        } while (was_error && (errno == EINTR));
}


/*
 *  Suspend emulator thread, virtual CPU in idle mode
 */

#ifdef HAVE_PTHREADS
#if defined(HAVE_PTHREAD_COND_INIT)
#define IDLE_USES_COND_WAIT 1
static pthread_mutex_t idle_lock = PTHREAD_MUTEX_INITIALIZER;
static pthread_cond_t idle_cond = PTHREAD_COND_INITIALIZER;
#elif defined(HAVE_SEM_INIT)
#define IDLE_USES_SEMAPHORE 1
#include <semaphore.h>
#ifdef HAVE_SPINLOCKS
static spinlock_t idle_lock = SPIN_LOCK_UNLOCKED;
#define LOCK_IDLE spin_lock(&idle_lock)
#define UNLOCK_IDLE spin_unlock(&idle_lock)
#else
static pthread_mutex_t idle_lock = PTHREAD_MUTEX_INITIALIZER;
#define LOCK_IDLE pthread_mutex_lock(&idle_lock)
#define UNLOCK_IDLE pthread_mutex_unlock(&idle_lock)
#endif
static sem_t idle_sem;
static int idle_sem_ok = -1;
#endif
#endif

void idle_wait(void)
{
#ifdef IDLE_USES_COND_WAIT
        pthread_mutex_lock(&idle_lock);
        pthread_cond_wait(&idle_cond, &idle_lock);
        pthread_mutex_unlock(&idle_lock);
#else
#ifdef IDLE_USES_SEMAPHORE
        LOCK_IDLE;
        if (idle_sem_ok < 0)
                idle_sem_ok = (sem_init(&idle_sem, 0, 0) == 0);
        if (idle_sem_ok > 0) {
                idle_sem_ok++;
                UNLOCK_IDLE;
                sem_wait(&idle_sem);
                return;
        }
        UNLOCK_IDLE;
#endif

        // Fallback: sleep 10 ms
        Delay_usec(10000);
#endif
}


/*
 *  Resume execution of emulator thread, events just arrived
 */

void idle_resume(void)
{
#ifdef IDLE_USES_COND_WAIT
        pthread_cond_signal(&idle_cond);
#else
#ifdef IDLE_USES_SEMAPHORE
        LOCK_IDLE;
        if (idle_sem_ok > 1) {
                idle_sem_ok--;
                UNLOCK_IDLE;
                sem_post(&idle_sem);
                return;
        }
        UNLOCK_IDLE;
#endif
#endif
}
Revision:	1.19
Committed:	2006-05-01T13:13:18Z (18 years, 1 month ago) by gbeauche
Branch:	MAIN
CVS Tags:	nigel-build-19
Changes since 1.18:	+6 -2 lines
Log Message:	improve locks
#	Content
1	/*
2	* timer_unix.cpp - Time Manager emulation, Unix specific stuff
3	*
4	* Basilisk II (C) 1997-2005 Christian Bauer
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
8	* the Free Software Foundation; either version 2 of the License, or
9	* (at your option) any later version.
10	*
11	* This program is distributed in the hope that it will be useful,
12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14	* GNU General Public License for more details.
15	*
16	* You should have received a copy of the GNU General Public License
17	* along with this program; if not, write to the Free Software
18	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19	*/
20
21	#include "sysdeps.h"
22	#include "macos_util.h"
23	#include "timer.h"
24
25	#include <errno.h>
26
27	#define DEBUG 0
28	#include "debug.h"
29
30	// For NetBSD with broken pthreads headers
31	#ifndef CLOCK_REALTIME
32	#define CLOCK_REALTIME 0
33	#endif
34
35
36	/*
37	* Return microseconds since boot (64 bit)
38	*/
39
40	void Microseconds(uint32 &hi, uint32 &lo)
41	{
42	D(bug("Microseconds\n"));
43	#ifdef HAVE_CLOCK_GETTIME
44	struct timespec t;
45	clock_gettime(CLOCK_REALTIME, &t);
46	uint64 tl = (uint64)t.tv_sec * 1000000 + t.tv_nsec / 1000;
47	#else
48	struct timeval t;
49	gettimeofday(&t, NULL);
50	uint64 tl = (uint64)t.tv_sec * 1000000 + t.tv_usec;
51	#endif
52	hi = tl >> 32;
53	lo = tl;
54	}
55
56
57	/*
58	* Return local date/time in Mac format (seconds since 1.1.1904)
59	*/
60
61	uint32 TimerDateTime(void)
62	{
63	return TimeToMacTime(time(NULL));
64	}
65
66
67	/*
68	* Get current time
69	*/
70
71	void timer_current_time(tm_time_t &t)
72	{
73	#ifdef HAVE_CLOCK_GETTIME
74	clock_gettime(CLOCK_REALTIME, &t);
75	#else
76	gettimeofday(&t, NULL);
77	#endif
78	}
79
80
81	/*
82	* Add times
83	*/
84
85	void timer_add_time(tm_time_t &res, tm_time_t a, tm_time_t b)
86	{
87	#ifdef HAVE_CLOCK_GETTIME
88	res.tv_sec = a.tv_sec + b.tv_sec;
89	res.tv_nsec = a.tv_nsec + b.tv_nsec;
90	if (res.tv_nsec >= 1000000000) {
91	res.tv_sec++;
92	res.tv_nsec -= 1000000000;
93	}
94	#else
95	res.tv_sec = a.tv_sec + b.tv_sec;
96	res.tv_usec = a.tv_usec + b.tv_usec;
97	if (res.tv_usec >= 1000000) {
98	res.tv_sec++;
99	res.tv_usec -= 1000000;
100	}
101	#endif
102	}
103
104
105	/*
106	* Subtract times
107	*/
108
109	void timer_sub_time(tm_time_t &res, tm_time_t a, tm_time_t b)
110	{
111	#ifdef HAVE_CLOCK_GETTIME
112	res.tv_sec = a.tv_sec - b.tv_sec;
113	res.tv_nsec = a.tv_nsec - b.tv_nsec;
114	if (res.tv_nsec < 0) {
115	res.tv_sec--;
116	res.tv_nsec += 1000000000;
117	}
118	#else
119	res.tv_sec = a.tv_sec - b.tv_sec;
120	res.tv_usec = a.tv_usec - b.tv_usec;
121	if (res.tv_usec < 0) {
122	res.tv_sec--;
123	res.tv_usec += 1000000;
124	}
125	#endif
126	}
127
128
129	/*
130	* Compare times (<0: a < b, =0: a = b, >0: a > b)
131	*/
132
133	int timer_cmp_time(tm_time_t a, tm_time_t b)
134	{
135	#ifdef HAVE_CLOCK_GETTIME
136	if (a.tv_sec == b.tv_sec)
137	return a.tv_nsec - b.tv_nsec;
138	else
139	return a.tv_sec - b.tv_sec;
140	#else
141	if (a.tv_sec == b.tv_sec)
142	return a.tv_usec - b.tv_usec;
143	else
144	return a.tv_sec - b.tv_sec;
145	#endif
146	}
147
148
149	/*
150	* Convert Mac time value (>0: microseconds, <0: microseconds) to tm_time_t
151	*/
152
153	void timer_mac2host_time(tm_time_t &res, int32 mactime)
154	{
155	#ifdef HAVE_CLOCK_GETTIME
156	if (mactime > 0) {
157	// Time in milliseconds
158	res.tv_sec = mactime / 1000;
159	res.tv_nsec = (mactime % 1000) * 1000000;
160	} else {
161	// Time in negative microseconds
162	res.tv_sec = -mactime / 1000000;
163	res.tv_nsec = (-mactime % 1000000) * 1000;
164	}
165	#else
166	if (mactime > 0) {
167	// Time in milliseconds
168	res.tv_sec = mactime / 1000;
169	res.tv_usec = (mactime % 1000) * 1000;
170	} else {
171	// Time in negative microseconds
172	res.tv_sec = -mactime / 1000000;
173	res.tv_usec = -mactime % 1000000;
174	}
175	#endif
176	}
177
178
179	/*
180	* Convert positive tm_time_t to Mac time value (>0: microseconds, <0: microseconds)
181	* A negative input value for hosttime results in a zero return value
182	* As long as the microseconds value fits in 32 bit, it must not be converted to milliseconds!
183	*/
184
185	int32 timer_host2mac_time(tm_time_t hosttime)
186	{
187	if (hosttime.tv_sec < 0)
188	return 0;
189	else {
190	#ifdef HAVE_CLOCK_GETTIME
191	uint64 t = (uint64)hosttime.tv_sec * 1000000 + hosttime.tv_nsec / 1000;
192	#else
193	uint64 t = (uint64)hosttime.tv_sec * 1000000 + hosttime.tv_usec;
194	#endif
195	if (t > 0x7fffffff)
196	return t / 1000; // Time in milliseconds
197	else
198	return -t; // Time in negative microseconds
199	}
200	}
201
202
203	/*
204	* Get current value of microsecond timer
205	*/
206
207	uint64 GetTicks_usec(void)
208	{
209	#ifdef HAVE_CLOCK_GETTIME
210	struct timespec t;
211	clock_gettime(CLOCK_REALTIME, &t);
212	return (uint64)t.tv_sec * 1000000 + t.tv_nsec / 1000;
213	#else
214	struct timeval t;
215	gettimeofday(&t, NULL);
216	return (uint64)t.tv_sec * 1000000 + t.tv_usec;
217	#endif
218	}
219
220
221	/*
222	* Delay by specified number of microseconds (<1 second)
223	* (adapted from SDL_Delay() source; this function is designed to provide
224	* the highest accuracy possible)
225	*/
226
227	#if defined(linux)
228	// Linux select() changes its timeout parameter upon return to contain
229	// the remaining time. Most other unixen leave it unchanged or undefined.
230	#define SELECT_SETS_REMAINING
231	#elif defined(__FreeBSD__) \|\| defined(__sun__) \|\| (defined(__MACH__) && defined(__APPLE__))
232	#define USE_NANOSLEEP
233	#elif defined(HAVE_PTHREADS) && defined(sgi)
234	// SGI pthreads has a bug when using pthreads+signals+nanosleep,
235	// so instead of using nanosleep, wait on a CV which is never signalled.
236	#include <pthread.h>
237	#define USE_COND_TIMEDWAIT
238	#endif
239
240	void Delay_usec(uint32 usec)
241	{
242	int was_error;
243
244	#if defined(USE_NANOSLEEP)
245	struct timespec elapsed, tv;
246	#elif defined(USE_COND_TIMEDWAIT)
247	// Use a local mutex and cv, so threads remain independent
248	pthread_cond_t delay_cond = PTHREAD_COND_INITIALIZER;
249	pthread_mutex_t delay_mutex = PTHREAD_MUTEX_INITIALIZER;
250	struct timespec elapsed;
251	uint64 future;
252	#else
253	struct timeval tv;
254	#ifndef SELECT_SETS_REMAINING
255	uint64 then, now, elapsed;
256	#endif
257	#endif
258
259	// Set the timeout interval - Linux only needs to do this once
260	#if defined(SELECT_SETS_REMAINING)
261	tv.tv_sec = 0;
262	tv.tv_usec = usec;
263	#elif defined(USE_NANOSLEEP)
264	elapsed.tv_sec = 0;
265	elapsed.tv_nsec = usec * 1000;
266	#elif defined(USE_COND_TIMEDWAIT)
267	future = GetTicks_usec() + usec;
268	elapsed.tv_sec = future / 1000000;
269	elapsed.tv_nsec = (future % 1000000) * 1000;
270	#else
271	then = GetTicks_usec();
272	#endif
273
274	do {
275	errno = 0;
276	#if defined(USE_NANOSLEEP)
277	tv.tv_sec = elapsed.tv_sec;
278	tv.tv_nsec = elapsed.tv_nsec;
279	was_error = nanosleep(&tv, &elapsed);
280	#elif defined(USE_COND_TIMEDWAIT)
281	was_error = pthread_mutex_lock(&delay_mutex);
282	was_error = pthread_cond_timedwait(&delay_cond, &delay_mutex, &elapsed);
283	was_error = pthread_mutex_unlock(&delay_mutex);
284	#else
285	#ifndef SELECT_SETS_REMAINING
286	// Calculate the time interval left (in case of interrupt)
287	now = GetTicks_usec();
288	elapsed = now - then;
289	then = now;
290	if (elapsed >= usec)
291	break;
292	usec -= elapsed;
293	tv.tv_sec = 0;
294	tv.tv_usec = usec;
295	#endif
296	was_error = select(0, NULL, NULL, NULL, &tv);
297	#endif
298	} while (was_error && (errno == EINTR));
299	}
300
301
302	/*
303	* Suspend emulator thread, virtual CPU in idle mode
304	*/
305
306	#ifdef HAVE_PTHREADS
307	#if defined(HAVE_PTHREAD_COND_INIT)
308	#define IDLE_USES_COND_WAIT 1
309	static pthread_mutex_t idle_lock = PTHREAD_MUTEX_INITIALIZER;
310	static pthread_cond_t idle_cond = PTHREAD_COND_INITIALIZER;
311	#elif defined(HAVE_SEM_INIT)
312	#define IDLE_USES_SEMAPHORE 1
313	#include <semaphore.h>
314	#ifdef HAVE_SPINLOCKS
315	static spinlock_t idle_lock = SPIN_LOCK_UNLOCKED;
316	#define LOCK_IDLE spin_lock(&idle_lock)
317	#define UNLOCK_IDLE spin_unlock(&idle_lock)
318	#else
319	static pthread_mutex_t idle_lock = PTHREAD_MUTEX_INITIALIZER;
320	#define LOCK_IDLE pthread_mutex_lock(&idle_lock)
321	#define UNLOCK_IDLE pthread_mutex_unlock(&idle_lock)
322	#endif
323	static sem_t idle_sem;
324	static int idle_sem_ok = -1;
325	#endif
326	#endif
327
328	void idle_wait(void)
329	{
330	#ifdef IDLE_USES_COND_WAIT
331	pthread_mutex_lock(&idle_lock);
332	pthread_cond_wait(&idle_cond, &idle_lock);
333	pthread_mutex_unlock(&idle_lock);
334	#else
335	#ifdef IDLE_USES_SEMAPHORE
336	LOCK_IDLE;
337	if (idle_sem_ok < 0)
338	idle_sem_ok = (sem_init(&idle_sem, 0, 0) == 0);
339	if (idle_sem_ok > 0) {
340	idle_sem_ok++;
341	UNLOCK_IDLE;
342	sem_wait(&idle_sem);
343	return;
344	}
345	UNLOCK_IDLE;
346	#endif
347
348	// Fallback: sleep 10 ms
349	Delay_usec(10000);
350	#endif
351	}
352
353
354	/*
355	* Resume execution of emulator thread, events just arrived
356	*/
357
358	void idle_resume(void)
359	{
360	#ifdef IDLE_USES_COND_WAIT
361	pthread_cond_signal(&idle_cond);
362	#else
363	#ifdef IDLE_USES_SEMAPHORE
364	LOCK_IDLE;
365	if (idle_sem_ok > 1) {
366	idle_sem_ok--;
367	UNLOCK_IDLE;
368	sem_post(&idle_sem);
369	return;
370	}
371	UNLOCK_IDLE;
372	#endif
373	#endif
374	}