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_cond_wait(&idle_cond, &idle_lock);
#else
#ifdef IDLE_USES_SEMAPHORE
        if (idle_sem_ok < 0)
                idle_sem_ok = (sem_init(&idle_sem, 0, 0) == 0);
        if (idle_sem_ok > 0) {
                LOCK_IDLE;
                idle_sem_ok++;
                UNLOCK_IDLE;
                sem_wait(&idle_sem);
                return;
        }
#endif
        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
        if (idle_sem_ok > 1) {
                LOCK_IDLE;
                idle_sem_ok--;
                UNLOCK_IDLE;
                sem_post(&idle_sem);
                return;
        }
#endif
#endif
}
Revision:	1.17
Committed:	2005-06-30T10:20:18Z (19 years, 4 months ago) by gbeauche
Branch:	MAIN
Changes since 1.16:	+69 -0 lines
Log Message:	Add system-specific implementations of idle_{wait,resume} functions.
#	User	Rev	Content
1	cebix	1.1	/*
2			* timer_unix.cpp - Time Manager emulation, Unix specific stuff
3			*
4	gbeauche	1.15	* Basilisk II (C) 1997-2005 Christian Bauer
5	cebix	1.1	*
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	cebix	1.10	#include "macos_util.h"
23	cebix	1.1	#include "timer.h"
24
25	cebix	1.11	#include <errno.h>
26
27	cebix	1.1	#define DEBUG 0
28			#include "debug.h"
29
30	cebix	1.8	// For NetBSD with broken pthreads headers
31			#ifndef CLOCK_REALTIME
32			#define CLOCK_REALTIME 0
33			#endif
34
35	cebix	1.1
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	cebix	1.10	return TimeToMacTime(time(NULL));
64	cebix	1.1	}
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	cebix	1.11	}
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	gbeauche	1.16	#elif defined(__FreeBSD__) \|\| defined(__sun__) \|\| (defined(__MACH__) && defined(__APPLE__))
232	cebix	1.11	#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	cebix	1.12	#include <pthread.h>
237	cebix	1.11	#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	cebix	1.1	}
300	gbeauche	1.17
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_cond_wait(&idle_cond, &idle_lock);
332			#else
333			#ifdef IDLE_USES_SEMAPHORE
334			if (idle_sem_ok < 0)
335			idle_sem_ok = (sem_init(&idle_sem, 0, 0) == 0);
336			if (idle_sem_ok > 0) {
337			LOCK_IDLE;
338			idle_sem_ok++;
339			UNLOCK_IDLE;
340			sem_wait(&idle_sem);
341			return;
342			}
343			#endif
344			Delay_usec(10000);
345			#endif
346			}
347
348
349			/*
350			* Resume execution of emulator thread, events just arrived
351			*/
352
353			void idle_resume(void)
354			{
355			#ifdef IDLE_USES_COND_WAIT
356			pthread_cond_signal(&idle_cond);
357			#else
358			#ifdef IDLE_USES_SEMAPHORE
359			if (idle_sem_ok > 1) {
360			LOCK_IDLE;
361			idle_sem_ok--;
362			UNLOCK_IDLE;
363			sem_post(&idle_sem);
364			return;
365			}
366			#endif
367			#endif
368			}