summaryrefslogtreecommitdiffstatshomepage
path: root/src/osd/modules/sync/sync_ntc.cpp
blob: e283be5000a4b1110ba7c1c47e22df24f41f0924 (plain) (blame)
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
// license:BSD-3-Clause
// copyright-holders:Olivier Galibert, R. Belmont
//============================================================
//
//  sdlsync.c - SDL core synchronization functions
//
//  SDLMAME by Olivier Galibert and R. Belmont
//
//============================================================

#ifndef _GNU_SOURCE
#define _GNU_SOURCE     // for PTHREAD_MUTEX_RECURSIVE; needs to be here before other glibc headers are included
#endif

#include "sdlinc.h"

#ifdef SDLMAME_MACOSX
#include <mach/mach.h>
#include <signal.h>
#endif

#if defined(SDLMAME_NETBSD) || defined(SDLMAME_OPENBSD)
/* for SIGKILL */
#include <signal.h>
#endif

// standard C headers
#include <math.h>
#include <unistd.h>

// MAME headers
#include "osdcore.h"
#include "osdsync.h"

#include "eminline.h"

#include <pthread.h>
#include <errno.h>
#include <sys/time.h>

struct osd_lock {
	volatile pthread_t  holder;
	INT32               count;
#ifdef PTR64
	INT8                padding[52];    // Fill a 64-byte cache line
#else
	INT8                padding[56];    // A bit more padding
#endif
};

struct osd_event {
	pthread_mutex_t     mutex;
	pthread_cond_t      cond;
	volatile INT32      autoreset;
	volatile INT32      signalled;
#ifdef PTR64
	INT8                padding[40];    // Fill a 64-byte cache line
#else
	INT8                padding[48];    // A bit more padding
#endif
};


//============================================================
//  TYPE DEFINITIONS
//============================================================

struct osd_thread {
	pthread_t           thread;
};

struct osd_scalable_lock
{
	struct
	{
		volatile INT32  haslock;        // do we have the lock?
		INT32           filler[64/4-1]; // assumes a 64-byte cache line
	} slot[WORK_MAX_THREADS];           // one slot per thread
	volatile INT32      nextindex;      // index of next slot to use
};


//============================================================
//  Scalable Locks
//============================================================

osd_scalable_lock *osd_scalable_lock_alloc(void)
{
	osd_scalable_lock *lock;

	lock = (osd_scalable_lock *)calloc(1, sizeof(*lock));
	if (lock == NULL)
		return NULL;

	memset(lock, 0, sizeof(*lock));
	lock->slot[0].haslock = TRUE;
	return lock;
}


INT32 osd_scalable_lock_acquire(osd_scalable_lock *lock)
{
	INT32 myslot = (atomic_increment32(&lock->nextindex) - 1) & (WORK_MAX_THREADS - 1);

#if defined(__i386__) || defined(__x86_64__)
	register INT32 tmp;
	__asm__ __volatile__ (
		"1: clr    %[tmp]             ;"
		"   xchg   %[haslock], %[tmp] ;"
		"   test   %[tmp], %[tmp]     ;"
		"   jne    3f                 ;"
		"2: mov    %[haslock], %[tmp] ;"
		"   test   %[tmp], %[tmp]     ;"
		"   jne    1b                 ;"
		"   pause                     ;"
		"   jmp    2b                 ;"
		"3:                            "
		: [haslock] "+m"  (lock->slot[myslot].haslock)
		, [tmp]     "=&r" (tmp)
		:
		: "cc"
	);
#elif defined(__ppc__) || defined (__PPC__) || defined(__ppc64__) || defined(__PPC64__)
	register INT32 tmp;
	__asm__ __volatile__ (
		"1: lwarx   %[tmp], 0, %[haslock] \n"
		"   cmpwi   %[tmp], 0             \n"
		"   bne     3f                    \n"
		"2: lwzx    %[tmp], 0, %[haslock] \n"
		"   cmpwi   %[tmp], 0             \n"
		"   bne     1b                    \n"
		"   nop                           \n"
		"   nop                           \n"
		"   b       2b                    \n"
		"3: li      %[tmp], 0             \n"
		"   stwcx.  %[tmp], 0, %[haslock] \n"
		"   bne-    1b                    \n"
		"   lwsync                        \n"
		: [tmp]     "=&r" (tmp)
		: [haslock] "r"   (&lock->slot[myslot].haslock)
		: "cr0"
	);
#else
	INT32 backoff = 1;
	while (!osd_compare_exchange32(&lock->slot[myslot].haslock, TRUE, FALSE))
	{
		INT32 backcount;
		for (backcount = 0; backcount < backoff; backcount++)
			osd_yield_processor();
		backoff <<= 1;
	}
#endif
	return myslot;
}


void osd_scalable_lock_release(osd_scalable_lock *lock, INT32 myslot)
{
#if defined(__i386__) || defined(__x86_64__)
	register INT32 tmp = TRUE;
	__asm__ __volatile__ (
		" xchg   %[haslock], %[tmp] ;"
		: [haslock] "+m" (lock->slot[(myslot + 1) & (WORK_MAX_THREADS - 1)].haslock)
		, [tmp]     "+r" (tmp)
		:
	);
#elif defined(__ppc__) || defined (__PPC__) || defined(__ppc64__) || defined(__PPC64__)
	lock->slot[(myslot + 1) & (WORK_MAX_THREADS - 1)].haslock = TRUE;
	__asm__ __volatile__ ( " lwsync " : : );
#else
	osd_exchange32(&lock->slot[(myslot + 1) & (WORK_MAX_THREADS - 1)].haslock, TRUE);
#endif
}

void osd_scalable_lock_free(osd_scalable_lock *lock)
{
	free(lock);
}

INLINE pthread_t osd_compare_exchange_pthread_t(pthread_t volatile *ptr, pthread_t compare, pthread_t exchange)
{
#ifdef PTR64
	INT64 result = compare_exchange64((INT64 volatile *)ptr, (INT64)compare, (INT64)exchange);
#else
	INT32 result = compare_exchange32((INT32 volatile *)ptr, (INT32)compare, (INT32)exchange);
#endif
	return (pthread_t)result;
}

INLINE pthread_t osd_exchange_pthread_t(pthread_t volatile *ptr, pthread_t exchange)
{
#ifdef PTR64
	INT64 result = osd_exchange64((INT64 volatile *)ptr, (INT64)exchange);
#else
	INT32 result = atomic_exchange32((INT32 volatile *)ptr, (INT32)exchange);
#endif
	return (pthread_t)result;
}


//============================================================
//  osd_lock_alloc
//============================================================

osd_lock *osd_lock_alloc(void)
{
	osd_lock *lock;

	lock = (osd_lock *)calloc(1, sizeof(osd_lock));
	if (lock == NULL)
		return NULL;

	lock->holder = 0;
	lock->count = 0;

	return lock;
}

//============================================================
//  osd_lock_acquire
//============================================================

void osd_lock_acquire(osd_lock *lock)
{
	pthread_t current, prev;

	current = pthread_self();
	prev = osd_compare_exchange_pthread_t(&lock->holder, 0, current);
	if (prev != nullptr && prev != current)
	{
		do {
			register INT32 spin = 10000; // Convenient spin count
			register pthread_t tmp;
#if defined(__i386__) || defined(__x86_64__)
			__asm__ __volatile__ (
				"1: pause                    ;"
				"   mov    %[holder], %[tmp] ;"
				"   test   %[tmp], %[tmp]    ;"
				"   loopne 1b                ;"
				: [spin]   "+c"  (spin)
				, [tmp]    "=&r" (tmp)
				: [holder] "m"   (lock->holder)
				: "cc"
			);
#elif defined(__ppc__) || defined(__PPC__)
			__asm__ __volatile__ (
				"1: nop                        \n"
				"   nop                        \n"
				"   lwzx  %[tmp], 0, %[holder] \n"
				"   cmpwi %[tmp], 0            \n"
				"   bdnzt eq, 1b               \n"
				: [spin]   "+c"  (spin)
				, [tmp]    "=&r" (tmp)
				: [holder] "r"   (&lock->holder)
				: "cr0"
			);
#elif defined(__ppc64__) || defined(__PPC64__)
			__asm__ __volatile__ (
				"1: nop                        \n"
				"   nop                        \n"
				"   ldx   %[tmp], 0, %[holder] \n"
				"   cmpdi %[tmp], 0            \n"
				"   bdnzt eq, 1b               \n"
				: [spin]   "+c"  (spin)
				, [tmp]    "=&r" (tmp)
				: [holder] "r"   (&lock->holder)
				: "cr0"
			);
#else
			while (--spin > 0 && lock->holder != NULL)
				osd_yield_processor();
#endif
#if 0
			/* If you mean to use locks as a blocking mechanism for extended
			 * periods of time, you should do something like this.  However,
			 * it kills the performance of gaelco3d.
			 */
			if (spin == 0)
			{
				struct timespec sleep = { 0, 100000 }, remaining;
				nanosleep(&sleep, &remaining); // sleep for 100us
			}
#endif
		} while (osd_compare_exchange_pthread_t(&lock->holder, 0, current) != nullptr);
	}
	lock->count++;
}

//============================================================
//  osd_lock_try
//============================================================

int osd_lock_try(osd_lock *lock)
{
	pthread_t current, prev;

	current = pthread_self();
	prev = osd_compare_exchange_pthread_t(&lock->holder, 0, current);
	if (prev == nullptr || prev == current)
	{
		lock->count++;
		return 1;
	}
	return 0;
}

//============================================================
//  osd_lock_release
//============================================================

void osd_lock_release(osd_lock *lock)
{
	pthread_t current;

	current = pthread_self();
	if (lock->holder == current)
	{
		if (--lock->count == 0)
#if defined(__ppc__) || defined(__PPC__) || defined(__ppc64__) || defined(__PPC64__)
		lock->holder = 0;
		__asm__ __volatile__( " lwsync " : : );
#else
		osd_exchange_pthread_t(&lock->holder, 0);
#endif
		return;
	}

	// trying to release a lock you don't hold is bad!
//  assert(lock->holder == pthread_self());
}

//============================================================
//  osd_lock_free
//============================================================

void osd_lock_free(osd_lock *lock)
{
	free(lock);
}

//============================================================
//  osd_event_alloc
//============================================================

osd_event *osd_event_alloc(int manualreset, int initialstate)
{
	osd_event *ev;
	pthread_mutexattr_t mtxattr;

	ev = (osd_event *)calloc(1, sizeof(osd_event));
	if (ev == NULL)
		return NULL;

	pthread_mutexattr_init(&mtxattr);
	pthread_mutex_init(&ev->mutex, &mtxattr);
	pthread_cond_init(&ev->cond, NULL);
	ev->signalled = initialstate;
	ev->autoreset = !manualreset;

	return ev;
}

//============================================================
//  osd_event_free
//============================================================

void osd_event_free(osd_event *event)
{
	pthread_mutex_destroy(&event->mutex);
	pthread_cond_destroy(&event->cond);
	free(event);
}

//============================================================
//  osd_event_set
//============================================================

void osd_event_set(osd_event *event)
{
	pthread_mutex_lock(&event->mutex);
	if (event->signalled == FALSE)
	{
		event->signalled = TRUE;
		if (event->autoreset)
			pthread_cond_signal(&event->cond);
		else
			pthread_cond_broadcast(&event->cond);
	}
	pthread_mutex_unlock(&event->mutex);
}

//============================================================
//  osd_event_reset
//============================================================

void osd_event_reset(osd_event *event)
{
	pthread_mutex_lock(&event->mutex);
	event->signalled = FALSE;
	pthread_mutex_unlock(&event->mutex);
}

//============================================================
//  osd_event_wait
//============================================================

int osd_event_wait(osd_event *event, osd_ticks_t timeout)
{
	if (timeout == OSD_EVENT_WAIT_INFINITE)
		timeout = osd_ticks_per_second() * (osd_ticks_t)10000;

	pthread_mutex_lock(&event->mutex);
	if (!timeout)
	{
		if (!event->signalled)
		{
				pthread_mutex_unlock(&event->mutex);
				return FALSE;
		}
	}
	else
	{
		if (!event->signalled)
		{
			struct timespec   ts;
			struct timeval    tp;
			UINT64 msec = timeout * 1000 / osd_ticks_per_second();
			UINT64 nsec;

			gettimeofday(&tp, NULL);

			ts.tv_sec  = tp.tv_sec;
			nsec = (UINT64) tp.tv_usec * (UINT64) 1000 + (msec * (UINT64) 1000000);
			ts.tv_nsec = nsec % (UINT64) 1000000000;
			ts.tv_sec += nsec / (UINT64) 1000000000;

			do {
				int ret = pthread_cond_timedwait(&event->cond, &event->mutex, &ts);
				if ( ret == ETIMEDOUT )
				{
					if (!event->signalled)
					{
						pthread_mutex_unlock(&event->mutex);
						return FALSE;
					}
					else
						break;
				}
				if (ret == 0)
					break;
				if ( ret != EINTR)
				{
					printf("Error %d while waiting for pthread_cond_timedwait:  %s\n", ret, strerror(ret));
				}

			} while (TRUE);
		}
	}

	if (event->autoreset)
		event->signalled = 0;

	pthread_mutex_unlock(&event->mutex);

	return TRUE;
}

//============================================================
//  osd_thread_create
//============================================================

osd_thread *osd_thread_create(osd_thread_callback callback, void *cbparam)
{
	osd_thread *thread;
	pthread_attr_t  attr;

	thread = (osd_thread *)calloc(1, sizeof(osd_thread));
	if (thread == NULL)
		return NULL;
	pthread_attr_init(&attr);
#ifndef SDLMAME_HAIKU
	pthread_attr_setinheritsched(&attr, PTHREAD_INHERIT_SCHED);
#endif
	if ( pthread_create(&thread->thread, &attr, callback, cbparam) != 0 )
	{
		free(thread);
		return NULL;
	}
	return thread;
}

//============================================================
//  osd_thread_adjust_priority
//============================================================

int osd_thread_adjust_priority(osd_thread *thread, int adjust)
{
	struct sched_param  sched;
	int                 policy;

	if ( pthread_getschedparam( thread->thread, &policy, &sched ) == 0 )
	{
		sched.sched_priority += adjust;
		if ( pthread_setschedparam(thread->thread, policy, &sched ) == 0)
			return TRUE;
		else
			return FALSE;
	}
	else
		return FALSE;
}

//============================================================
//  osd_thread_cpu_affinity
//============================================================

int osd_thread_cpu_affinity(osd_thread *thread, UINT32 mask)
{
	return TRUE;
}

//============================================================
//  osd_thread_wait_free
//============================================================

void osd_thread_wait_free(osd_thread *thread)
{
	pthread_join(thread->thread, NULL);
	free(thread);
}