sems-posix.cpp@ 1

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1	/* $Id: sems-posix.cpp 1 1970-01-01 00:00:00Z vboxsync $ */
2	/** @file
3	* InnoTek Portable Runtime - Semaphores, POSIX.
4	*/
5
6	/*
7	* Copyright (C) 2006 InnoTek Systemberatung GmbH
8	*
9	* This file is part of VirtualBox Open Source Edition (OSE), as
10	* available from http://www.virtualbox.org. This file is free software;
11	* you can redistribute it and/or modify it under the terms of the GNU
12	* General Public License as published by the Free Software Foundation,
13	* in version 2 as it comes in the "COPYING" file of the VirtualBox OSE
14	* distribution. VirtualBox OSE is distributed in the hope that it will
15	* be useful, but WITHOUT ANY WARRANTY of any kind.
16	*
17	* If you received this file as part of a commercial VirtualBox
18	* distribution, then only the terms of your commercial VirtualBox
19	* license agreement apply instead of the previous paragraph.
20	*/
21
22	/*******************************************************************************
23	* Header Files *
24	*******************************************************************************/
25	#include <iprt/semaphore.h>
26	#include <iprt/assert.h>
27	#include <iprt/alloc.h>
28	#include <iprt/asm.h>
29	#include <iprt/err.h>
30
31	#include <errno.h>
32	#include <pthread.h>
33	#include <unistd.h>
34	#include <sys/time.h>
35
36	#ifdef __DARWIN__
37	# define pthread_yield() pthread_yield_np()
38	#endif
39
40
41	/*******************************************************************************
42	* Structures and Typedefs *
43	*******************************************************************************/
44
45	/** Internal representation of the POSIX implementation of an Event semaphore.
46	* The POSIX implementation uses a mutex and a condition variable to implement
47	* the automatic reset event semaphore semantics.
48	*
49	* This must be identical to RTSEMEVENTMULTIINTERNAL!
50	*/
51	struct RTSEMEVENTINTERNAL
52	{
53	/** pthread condition. */
54	pthread_cond_t Cond;
55	/** pthread mutex which protects the condition and the event state. */
56	pthread_mutex_t Mutex;
57	/** The state of the semaphore.
58	* This is operated while owning mutex and using atomic updating. */
59	volatile uint32_t u32State;
60	/** Number of waiters. */
61	volatile uint32_t cWaiters;
62	};
63
64	/** Posix internal representation of a Mutex Multi semaphore.
65	* This must be identical to RTSEMEVENTINTERNAL! */
66	struct RTSEMEVENTMULTIINTERNAL
67	{
68	/** pthread condition. */
69	pthread_cond_t Cond;
70	/** pthread mutex which protects the condition and the event state. */
71	pthread_mutex_t Mutex;
72	/** The state of the semaphore.
73	* This is operated while owning mutex and using atomic updating. */
74	volatile uint32_t u32State;
75	/** Number of waiters. */
76	volatile uint32_t cWaiters;
77	};
78
79	/** The valus of the u32State variable in a RTSEMEVENTINTERNAL and RTSEMEVENTMULTIINTERNAL.
80	* @{ */
81	/** The object isn't initialized. */
82	#define EVENT_STATE_UNINITIALIZED 0
83	/** The semaphore is is signaled. */
84	#define EVENT_STATE_SIGNALED 0xff00ff00
85	/** The semaphore is not signaled. */
86	#define EVENT_STATE_NOT_SIGNALED 0x00ff00ff
87	/** @} */
88
89
90	/** Posix internal representation of a Mutex semaphore. */
91	struct RTSEMMUTEXINTERNAL
92	{
93	/** pthread mutex. */
94	pthread_mutex_t Mutex;
95	/** The owner of the mutex. */
96	volatile pthread_t Owner;
97	/** Nesting count. */
98	volatile uint32_t cNesting;
99	};
100
101	/** Posix internal representation of a read-write semaphore. */
102	struct RTSEMRWINTERNAL
103	{
104	/** pthread rwlock. */
105	pthread_rwlock_t RWLock;
106	/** Variable to check if initialized.
107	* 0 is uninitialized, ~0 is inititialized. */
108	volatile unsigned uCheck;
109	/** The write owner of the lock. */
110	volatile pthread_t WROwner;
111	};
112
113
114	/**
115	* Validate an Event semaphore handle passed to one of the interface.
116	*
117	* @returns true if valid.
118	* @returns false if invalid.
119	* @param pIntEventSem Pointer to the event semaphore to validate.
120	*/
121	inline bool rtsemEventValid(struct RTSEMEVENTINTERNAL *pIntEventSem)
122	{
123	if ((uintptr_t)pIntEventSem < 0x10000)
124	return false;
125
126	uint32_t u32 = pIntEventSem->u32State; /* this is volatile, so a explicit read like this is needed. */
127	if ( u32 != EVENT_STATE_NOT_SIGNALED
128	&& u32 != EVENT_STATE_SIGNALED)
129	return false;
130
131	return true;
132	}
133
134
135	RTDECL(int) RTSemEventCreate(PRTSEMEVENT pEventSem)
136	{
137	int rc;
138
139	/*
140	* Allocate semaphore handle.
141	*/
142	struct RTSEMEVENTINTERNAL pIntEventSem = (struct RTSEMEVENTINTERNAL )RTMemAlloc(sizeof(struct RTSEMEVENTINTERNAL));
143	if (pIntEventSem)
144	{
145	/*
146	* Create the condition variable.
147	*/
148	pthread_condattr_t CondAttr;
149	rc = pthread_condattr_init(&CondAttr);
150	if (!rc)
151	{
152	rc = pthread_cond_init(&pIntEventSem->Cond, &CondAttr);
153	if (!rc)
154	{
155	/*
156	* Create the semaphore.
157	*/
158	pthread_mutexattr_t MutexAttr;
159	rc = pthread_mutexattr_init(&MutexAttr);
160	if (!rc)
161	{
162	rc = pthread_mutex_init(&pIntEventSem->Mutex, &MutexAttr);
163	if (!rc)
164	{
165	pthread_mutexattr_destroy(&MutexAttr);
166	pthread_condattr_destroy(&CondAttr);
167
168	ASMAtomicXchgU32(&pIntEventSem->u32State, EVENT_STATE_NOT_SIGNALED);
169	ASMAtomicXchgU32(&pIntEventSem->cWaiters, 0);
170
171	*pEventSem = pIntEventSem;
172	return VINF_SUCCESS;
173	}
174	pthread_mutexattr_destroy(&MutexAttr);
175	}
176	pthread_cond_destroy(&pIntEventSem->Cond);
177	}
178	pthread_condattr_destroy(&CondAttr);
179	}
180
181	rc = RTErrConvertFromErrno(rc);
182	RTMemFree(pIntEventSem);
183	}
184	else
185	rc = VERR_NO_MEMORY;
186
187	return rc;
188	}
189
190
191	RTDECL(int) RTSemEventDestroy(RTSEMEVENT EventSem)
192	{
193	/*
194	* Validate handle.
195	*/
196	if (!rtsemEventValid(EventSem))
197	{
198	AssertMsgFailed(("Invalid handle %p!\n", EventSem));
199	return VERR_INVALID_HANDLE;
200	}
201
202	/*
203	* Abort all waiters forcing them to return failure.
204	*
205	*/
206	struct RTSEMEVENTINTERNAL *pIntEventSem = EventSem;
207	int rc;
208	for (int i = 30; i > 0; i--)
209	{
210	ASMAtomicXchgU32(&pIntEventSem->u32State, EVENT_STATE_UNINITIALIZED);
211	rc = pthread_cond_destroy(&pIntEventSem->Cond);
212	if (rc != EBUSY)
213	break;
214	pthread_cond_broadcast(&pIntEventSem->Cond);
215	usleep(1000);
216	} while (rc == EBUSY);
217	if (rc)
218	{
219	AssertMsgFailed(("Failed to destroy event sem %p, rc=%d.\n", EventSem, rc));
220	return RTErrConvertFromErrno(rc);
221	}
222
223	/*
224	* Destroy the semaphore
225	* If it's busy we'll wait a bit to give the threads a chance to be scheduled.
226	*/
227	for (int i = 30; i > 0; i--)
228	{
229	rc = pthread_mutex_destroy(&pIntEventSem->Mutex);
230	if (rc != EBUSY)
231	break;
232	usleep(1000);
233	}
234	if (rc)
235	{
236	AssertMsgFailed(("Failed to destroy event sem %p, rc=%d. (mutex)\n", EventSem, rc));
237	return RTErrConvertFromErrno(rc);
238	}
239
240	/*
241	* Free the semaphore memory and be gone.
242	*/
243	RTMemFree(pIntEventSem);
244	return VINF_SUCCESS;
245	}
246
247
248	RTDECL(int) RTSemEventSignal(RTSEMEVENT EventSem)
249	{
250	/*
251	* Validate input.
252	*/
253	if (!rtsemEventValid(EventSem))
254	{
255	AssertMsgFailed(("Invalid handle %p!\n", EventSem));
256	return VERR_INVALID_HANDLE;
257	}
258
259	/*
260	* Lock the mutex semaphore.
261	*/
262	struct RTSEMEVENTINTERNAL *pIntEventSem = EventSem;
263	int rc = pthread_mutex_lock(&pIntEventSem->Mutex);
264	if (rc)
265	{
266	AssertMsgFailed(("Failed to lock event sem %p, rc=%d.\n", EventSem, rc));
267	return RTErrConvertFromErrno(rc);
268	}
269
270	/*
271	* Check the state.
272	*/
273	if (pIntEventSem->u32State == EVENT_STATE_NOT_SIGNALED)
274	{
275	ASMAtomicXchgU32(&pIntEventSem->u32State, EVENT_STATE_SIGNALED);
276	rc = pthread_cond_signal(&pIntEventSem->Cond);
277	AssertMsg(!rc, ("Failed to signal event sem %p, rc=%d.\n", EventSem, rc));
278	}
279	else if (pIntEventSem->u32State == EVENT_STATE_SIGNALED)
280	{
281	rc = pthread_cond_signal(&pIntEventSem->Cond); /* give'm another kick... */
282	AssertMsg(!rc, ("Failed to signal event sem %p, rc=%d. (2)\n", EventSem, rc));
283	}
284	else
285	rc = VERR_SEM_DESTROYED;
286
287	/*
288	* Release the mutex and return.
289	*/
290	int rc2 = pthread_mutex_unlock(&pIntEventSem->Mutex);
291	AssertMsg(!rc2, ("Failed to unlock event sem %p, rc=%d.\n", EventSem, rc));
292	if (rc)
293	return RTErrConvertFromErrno(rc);
294	if (rc2)
295	return RTErrConvertFromErrno(rc2);
296
297	return VINF_SUCCESS;
298	}
299
300
301	static int rtSemEventWait(RTSEMEVENT EventSem, unsigned cMillies, bool fAutoResume)
302	{
303	/*
304	* Validate input.
305	*/
306	if (!rtsemEventValid(EventSem))
307	{
308	AssertMsgFailed(("Invalid handle %p!\n", EventSem));
309	return VERR_INVALID_HANDLE;
310	}
311
312	/*
313	* Timed or indefinite wait?
314	*/
315	struct RTSEMEVENTINTERNAL *pIntEventSem = EventSem;
316	if (cMillies == RT_INDEFINITE_WAIT)
317	{
318	/* for fairness, yield before going to sleep. */
319	if ( ASMAtomicIncU32(&pIntEventSem->cWaiters) > 1
320	&& pIntEventSem->u32State == EVENT_STATE_SIGNALED)
321	pthread_yield();
322
323	/* take mutex */
324	int rc = pthread_mutex_lock(&pIntEventSem->Mutex);
325	if (rc)
326	{
327	ASMAtomicDecU32(&pIntEventSem->cWaiters);
328	AssertMsgFailed(("Failed to lock event sem %p, rc=%d.\n", EventSem, rc));
329	return RTErrConvertFromErrno(rc);
330	}
331
332	for (;;)
333	{
334	/* check state. */
335	if (pIntEventSem->u32State == EVENT_STATE_SIGNALED)
336	{
337	ASMAtomicXchgU32(&pIntEventSem->u32State, EVENT_STATE_NOT_SIGNALED);
338	ASMAtomicDecU32(&pIntEventSem->cWaiters);
339	rc = pthread_mutex_unlock(&pIntEventSem->Mutex);
340	AssertMsg(!rc, ("Failed to unlock event sem %p, rc=%d.\n", EventSem, rc)); NOREF(rc);
341	return VINF_SUCCESS;
342	}
343	if (pIntEventSem->u32State == EVENT_STATE_UNINITIALIZED)
344	{
345	rc = pthread_mutex_unlock(&pIntEventSem->Mutex);
346	AssertMsg(!rc, ("Failed to unlock event sem %p, rc=%d.\n", EventSem, rc)); NOREF(rc);
347	return VERR_SEM_DESTROYED;
348	}
349
350	/* wait */
351	rc = pthread_cond_wait(&pIntEventSem->Cond, &pIntEventSem->Mutex);
352	if (rc)
353	{
354	AssertMsgFailed(("Failed to wait on event sem %p, rc=%d.\n", EventSem, rc));
355	ASMAtomicDecU32(&pIntEventSem->cWaiters);
356	int rc2 = pthread_mutex_unlock(&pIntEventSem->Mutex);
357	AssertMsg(!rc2, ("Failed to unlock event sem %p, rc=%d.\n", EventSem, rc2)); NOREF(rc2);
358	return RTErrConvertFromErrno(rc);
359	}
360	}
361	}
362	else
363	{
364	/*
365	* Get current time and calc end of wait time.
366	*/
367	struct timespec ts = {0,0};
368	#ifdef __DARWIN__
369	struct timeval tv = {0,0};
370	gettimeofday(&tv, NULL);
371	ts.tv_sec = tv.tv_sec;
372	ts.tv_nsec = tv.tv_usec * 1000;
373	#else
374	clock_gettime(CLOCK_REALTIME, &ts);
375	#endif
376	if (cMillies != 0)
377	{
378	ts.tv_nsec += (cMillies % 1000) * 1000000;
379	ts.tv_sec += cMillies / 1000;
380	if (ts.tv_nsec >= 1000000000)
381	{
382	ts.tv_nsec -= 1000000000;
383	ts.tv_sec++;
384	}
385	}
386
387	/* for fairness, yield before going to sleep. */
388	if (ASMAtomicIncU32(&pIntEventSem->cWaiters) > 1)
389	pthread_yield();
390
391	/* take mutex */
392	#ifdef __DARWIN__
393	int rc = pthread_mutex_lock(&pIntEventSem->Mutex);
394	#else
395	int rc = pthread_mutex_timedlock(&pIntEventSem->Mutex, &ts);
396	#endif
397	if (rc)
398	{
399	ASMAtomicDecU32(&pIntEventSem->cWaiters);
400	AssertMsg(rc == ETIMEDOUT, ("Failed to lock event sem %p, rc=%d.\n", EventSem, rc));
401	return RTErrConvertFromErrno(rc);
402	}
403
404	for (;;)
405	{
406	/* check state. */
407	if (pIntEventSem->u32State == EVENT_STATE_SIGNALED)
408	{
409	ASMAtomicXchgU32(&pIntEventSem->u32State, EVENT_STATE_NOT_SIGNALED);
410	ASMAtomicDecU32(&pIntEventSem->cWaiters);
411	rc = pthread_mutex_unlock(&pIntEventSem->Mutex);
412	AssertMsg(!rc, ("Failed to unlock event sem %p, rc=%d.\n", EventSem, rc)); NOREF(rc);
413	return VINF_SUCCESS;
414	}
415	if (pIntEventSem->u32State == EVENT_STATE_UNINITIALIZED)
416	{
417	rc = pthread_mutex_unlock(&pIntEventSem->Mutex);
418	AssertMsg(!rc, ("Failed to unlock event sem %p, rc=%d.\n", EventSem, rc)); NOREF(rc);
419	return VERR_SEM_DESTROYED;
420	}
421
422	/* wait */
423	rc = pthread_cond_timedwait(&pIntEventSem->Cond, &pIntEventSem->Mutex, &ts);
424	if (rc && (rc != EINTR \|\| !fAutoResume)) /* according to SuS this function shall not return EINTR, but linux man page says differently. */
425	{
426	AssertMsg(rc == ETIMEDOUT, ("Failed to wait on event sem %p, rc=%d.\n", EventSem, rc));
427	ASMAtomicDecU32(&pIntEventSem->cWaiters);
428	int rc2 = pthread_mutex_unlock(&pIntEventSem->Mutex);
429	AssertMsg(!rc2, ("Failed to unlock event sem %p, rc2=%d.\n", EventSem, rc2)); NOREF(rc2);
430	return RTErrConvertFromErrno(rc);
431	}
432	} /* for (;;) */
433	}
434	}
435
436
437	RTDECL(int) RTSemEventWait(RTSEMEVENT EventSem, unsigned cMillies)
438	{
439	int rc = rtSemEventWait(EventSem, cMillies, true);
440	Assert(rc != VERR_INTERRUPTED);
441	return rc;
442	}
443
444
445	RTDECL(int) RTSemEventWaitNoResume(RTSEMEVENT EventSem, unsigned cMillies)
446	{
447	return rtSemEventWait(EventSem, cMillies, false);
448	}
449
450
451
452
453
454
455	/**
456	* Validate an event multi semaphore handle passed to one of the interface.
457	*
458	* @returns true if valid.
459	* @returns false if invalid.
460	* @param pIntEventMultiSem Pointer to the event semaphore to validate.
461	*/
462	inline bool rtsemEventMultiValid(struct RTSEMEVENTMULTIINTERNAL *pIntEventMultiSem)
463	{
464	if ((uintptr_t)pIntEventMultiSem < 0x10000)
465	return false;
466
467	uint32_t u32 = pIntEventMultiSem->u32State; /* this is volatile, so a explicit read like this is needed. */
468	if ( u32 != EVENT_STATE_NOT_SIGNALED
469	&& u32 != EVENT_STATE_SIGNALED)
470	return false;
471
472	return true;
473	}
474
475
476	RTDECL(int) RTSemEventMultiCreate(PRTSEMEVENTMULTI pEventMultiSem)
477	{
478	/* the code and the structure is identical with other type for this function. */
479	return RTSemEventCreate((PRTSEMEVENT)pEventMultiSem);
480	}
481
482
483	RTDECL(int) RTSemEventMultiDestroy(RTSEMEVENTMULTI EventMultiSem)
484	{
485	/* the code and the structure is identical with other type for this function. */
486	return RTSemEventDestroy((RTSEMEVENT)EventMultiSem);
487	}
488
489
490	RTDECL(int) RTSemEventMultiSignal(RTSEMEVENTMULTI EventMultiSem)
491	{
492	/* the code and the structure is identical with other type for this function. */
493	return RTSemEventSignal((RTSEMEVENT)EventMultiSem);
494	}
495
496
497	RTDECL(int) RTSemEventMultiReset(RTSEMEVENTMULTI EventMultiSem)
498	{
499	/*
500	* Validate input.
501	*/
502	if (!rtsemEventMultiValid(EventMultiSem))
503	{
504	AssertMsgFailed(("Invalid handle %p!\n", EventMultiSem));
505	return VERR_INVALID_HANDLE;
506	}
507
508	/*
509	* Lock the mutex semaphore.
510	*/
511	struct RTSEMEVENTMULTIINTERNAL *pIntEventMultiSem = EventMultiSem;
512	int rc = pthread_mutex_lock(&pIntEventMultiSem->Mutex);
513	if (rc)
514	{
515	AssertMsgFailed(("Failed to lock event multi sem %p, rc=%d.\n", EventMultiSem, rc));
516	return RTErrConvertFromErrno(rc);
517	}
518
519	/*
520	* Check the state.
521	*/
522	if (pIntEventMultiSem->u32State == EVENT_STATE_SIGNALED)
523	ASMAtomicXchgU32(&pIntEventMultiSem->u32State, EVENT_STATE_NOT_SIGNALED);
524	else if (pIntEventMultiSem->u32State != EVENT_STATE_NOT_SIGNALED)
525	rc = VERR_SEM_DESTROYED;
526
527	/*
528	* Release the mutex and return.
529	*/
530	rc = pthread_mutex_unlock(&pIntEventMultiSem->Mutex);
531	if (rc)
532	{
533	AssertMsgFailed(("Failed to unlock event multi sem %p, rc=%d.\n", EventMultiSem, rc));
534	return RTErrConvertFromErrno(rc);
535	}
536
537	return VINF_SUCCESS;
538
539	}
540
541
542	static int rtSemEventMultiWait(RTSEMEVENTMULTI EventMultiSem, unsigned cMillies, bool fAutoResume)
543	{
544	/*
545	* Validate input.
546	*/
547	if (!rtsemEventMultiValid(EventMultiSem))
548	{
549	AssertMsgFailed(("Invalid handle %p!\n", EventMultiSem));
550	return VERR_INVALID_HANDLE;
551	}
552
553	/*
554	* Timed or indefinite wait?
555	*/
556	struct RTSEMEVENTMULTIINTERNAL *pIntEventMultiSem = EventMultiSem;
557	if (cMillies == RT_INDEFINITE_WAIT)
558	{
559	/* take mutex */
560	int rc = pthread_mutex_lock(&pIntEventMultiSem->Mutex);
561	if (rc)
562	{
563	AssertMsgFailed(("Failed to lock event multi sem %p, rc=%d.\n", EventMultiSem, rc));
564	return RTErrConvertFromErrno(rc);
565	}
566	ASMAtomicIncU32(&pIntEventMultiSem->cWaiters);
567
568	for (;;)
569	{
570	/* check state. */
571	if (pIntEventMultiSem->u32State == EVENT_STATE_SIGNALED)
572	{
573	ASMAtomicDecU32(&pIntEventMultiSem->cWaiters);
574	rc = pthread_mutex_unlock(&pIntEventMultiSem->Mutex);
575	AssertMsg(!rc, ("Failed to unlock event multi sem %p, rc=%d.\n", EventMultiSem, rc)); NOREF(rc);
576	return VINF_SUCCESS;
577	}
578	if (pIntEventMultiSem->u32State == EVENT_STATE_UNINITIALIZED)
579	{
580	rc = pthread_mutex_unlock(&pIntEventMultiSem->Mutex);
581	AssertMsg(!rc, ("Failed to unlock event multi sem %p, rc=%d.\n", EventMultiSem, rc)); NOREF(rc);
582	return VERR_SEM_DESTROYED;
583	}
584
585	/* wait */
586	rc = pthread_cond_wait(&pIntEventMultiSem->Cond, &pIntEventMultiSem->Mutex);
587	if (rc)
588	{
589	AssertMsgFailed(("Failed to wait on event multi sem %p, rc=%d.\n", EventMultiSem, rc));
590	ASMAtomicDecU32(&pIntEventMultiSem->cWaiters);
591	int rc2 = pthread_mutex_unlock(&pIntEventMultiSem->Mutex);
592	AssertMsg(!rc2, ("Failed to unlock event multi sem %p, rc=%d.\n", EventMultiSem, rc2)); NOREF(rc2);
593	return RTErrConvertFromErrno(rc);
594	}
595	}
596	}
597	else
598	{
599	/*
600	* Get current time and calc end of wait time.
601	*/
602	struct timespec ts = {0,0};
603	#ifdef __DARWIN__
604	struct timeval tv = {0,0};
605	gettimeofday(&tv, NULL);
606	ts.tv_sec = tv.tv_sec;
607	ts.tv_nsec = tv.tv_usec * 1000;
608	#else
609	clock_gettime(CLOCK_REALTIME, &ts);
610	#endif
611	if (cMillies != 0)
612	{
613	ts.tv_nsec += (cMillies % 1000) * 1000000;
614	ts.tv_sec += cMillies / 1000;
615	if (ts.tv_nsec >= 1000000000)
616	{
617	ts.tv_nsec -= 1000000000;
618	ts.tv_sec++;
619	}
620	}
621
622	/* take mutex */
623	#ifdef __DARWIN__
624	int rc = pthread_mutex_lock(&pIntEventMultiSem->Mutex);
625	#else
626	int rc = pthread_mutex_timedlock(&pIntEventMultiSem->Mutex, &ts);
627	#endif
628	if (rc)
629	{
630	AssertMsg(rc == ETIMEDOUT, ("Failed to lock event multi sem %p, rc=%d.\n", EventMultiSem, rc));
631	return RTErrConvertFromErrno(rc);
632	}
633	ASMAtomicIncU32(&pIntEventMultiSem->cWaiters);
634
635	for (;;)
636	{
637	/* check state. */
638	if (pIntEventMultiSem->u32State == EVENT_STATE_SIGNALED)
639	{
640	ASMAtomicXchgU32(&pIntEventMultiSem->u32State, EVENT_STATE_NOT_SIGNALED);
641	ASMAtomicDecU32(&pIntEventMultiSem->cWaiters);
642	rc = pthread_mutex_unlock(&pIntEventMultiSem->Mutex);
643	AssertMsg(!rc, ("Failed to unlock event multi sem %p, rc=%d.\n", EventMultiSem, rc)); NOREF(rc);
644	return VINF_SUCCESS;
645	}
646	if (pIntEventMultiSem->u32State == EVENT_STATE_UNINITIALIZED)
647	{
648	rc = pthread_mutex_unlock(&pIntEventMultiSem->Mutex);
649	AssertMsg(!rc, ("Failed to unlock event multi sem %p, rc=%d.\n", EventMultiSem, rc)); NOREF(rc);
650	return VERR_SEM_DESTROYED;
651	}
652
653	/* wait */
654	rc = pthread_cond_timedwait(&pIntEventMultiSem->Cond, &pIntEventMultiSem->Mutex, &ts);
655	if (rc && (rc != EINTR \|\| !fAutoResume)) /* according to SuS this function shall not return EINTR, but linux man page says differently. */
656	{
657	AssertMsg(rc == ETIMEDOUT, ("Failed to wait on event multi sem %p, rc=%d.\n", EventMultiSem, rc));
658	ASMAtomicDecU32(&pIntEventMultiSem->cWaiters);
659	int rc2 = pthread_mutex_unlock(&pIntEventMultiSem->Mutex);
660	AssertMsg(!rc2, ("Failed to unlock event multi sem %p, rc=%d.\n", EventMultiSem, rc2)); NOREF(rc2);
661	return RTErrConvertFromErrno(rc);
662	}
663	}
664	}
665	}
666
667
668	RTDECL(int) RTSemEventMultiWait(RTSEMEVENTMULTI EventMultiSem, unsigned cMillies)
669	{
670	int rc = rtSemEventMultiWait(EventMultiSem, cMillies, true);
671	Assert(rc != VERR_INTERRUPTED);
672	return rc;
673	}
674
675
676	RTDECL(int) RTSemEventMultiWaitNoResume(RTSEMEVENTMULTI EventMultiSem, unsigned cMillies)
677	{
678	return rtSemEventMultiWait(EventMultiSem, cMillies, false);
679	}
680
681
682
683
684
685	/**
686	* Validate a Mutex semaphore handle passed to one of the interface.
687	*
688	* @returns true if valid.
689	* @returns false if invalid.
690	* @param pIntMutexSem Pointer to the mutex semaphore to validate.
691	*/
692	inline bool rtsemMutexValid(struct RTSEMMUTEXINTERNAL *pIntMutexSem)
693	{
694	if ((uintptr_t)pIntMutexSem < 0x10000)
695	return false;
696
697	if (pIntMutexSem->cNesting == (uint32_t)~0)
698	return false;
699
700	return true;
701	}
702
703
704	RTDECL(int) RTSemMutexCreate(PRTSEMMUTEX pMutexSem)
705	{
706	int rc;
707
708	/*
709	* Allocate semaphore handle.
710	*/
711	struct RTSEMMUTEXINTERNAL pIntMutexSem = (struct RTSEMMUTEXINTERNAL )RTMemAlloc(sizeof(struct RTSEMMUTEXINTERNAL));
712	if (pIntMutexSem)
713	{
714	/*
715	* Create the semaphore.
716	*/
717	pthread_mutexattr_t MutexAttr;
718	rc = pthread_mutexattr_init(&MutexAttr);
719	if (!rc)
720	{
721	rc = pthread_mutex_init(&pIntMutexSem->Mutex, &MutexAttr);
722	if (!rc)
723	{
724	pthread_mutexattr_destroy(&MutexAttr);
725
726	pIntMutexSem->Owner = (pthread_t)~0;
727	pIntMutexSem->cNesting = 0;
728
729	*pMutexSem = pIntMutexSem;
730	return VINF_SUCCESS;
731	}
732	pthread_mutexattr_destroy(&MutexAttr);
733	}
734	RTMemFree(pIntMutexSem);
735	}
736	else
737	rc = VERR_NO_MEMORY;
738
739	return rc;
740	}
741
742
743	RTDECL(int) RTSemMutexDestroy(RTSEMMUTEX MutexSem)
744	{
745	/*
746	* Validate input.
747	*/
748	if (!rtsemMutexValid(MutexSem))
749	{
750	AssertMsgFailed(("Invalid handle %p!\n", MutexSem));
751	return VERR_INVALID_HANDLE;
752	}
753
754	/*
755	* Try destroy it.
756	*/
757	struct RTSEMMUTEXINTERNAL *pIntMutexSem = MutexSem;
758	int rc = pthread_mutex_destroy(&pIntMutexSem->Mutex);
759	if (rc)
760	{
761	AssertMsgFailed(("Failed to destroy mutex sem %p, rc=%d.\n", MutexSem, rc));
762	return RTErrConvertFromErrno(rc);
763	}
764
765	/*
766	* Free the memory and be gone.
767	*/
768	pIntMutexSem->Owner = (pthread_t)~0;
769	pIntMutexSem->cNesting = ~0;
770	RTMemTmpFree(pIntMutexSem);
771
772	return VINF_SUCCESS;
773	}
774
775
776	RTDECL(int) RTSemMutexRequest(RTSEMMUTEX MutexSem, unsigned cMillies)
777	{
778	/*
779	* Validate input.
780	*/
781	if (!rtsemMutexValid(MutexSem))
782	{
783	AssertMsgFailed(("Invalid handle %p!\n", MutexSem));
784	return VERR_INVALID_HANDLE;
785	}
786
787	/*
788	* Check if nested request.
789	*/
790	pthread_t Self = pthread_self();
791	struct RTSEMMUTEXINTERNAL *pIntMutexSem = MutexSem;
792	if ( pIntMutexSem->Owner == Self
793	&& pIntMutexSem->cNesting > 0)
794	{
795	pIntMutexSem->cNesting++;
796	return VINF_SUCCESS;
797	}
798
799	/*
800	* Lock it.
801	*/
802	if (cMillies == RT_INDEFINITE_WAIT)
803	{
804	/* take mutex */
805	int rc = pthread_mutex_lock(&pIntMutexSem->Mutex);
806	if (rc)
807	{
808	AssertMsgFailed(("Failed to lock mutex sem %p, rc=%d.\n", MutexSem, rc)); NOREF(rc);
809	return RTErrConvertFromErrno(rc);
810	}
811	}
812	else
813	{
814	#ifdef __DARWIN__
815	AssertMsgFailed(("Not implemented on Darwin yet because of incomplete pthreads API."));
816	return VERR_NOT_IMPLEMENTED;
817	#else /* !__DARWIN__ */
818	/*
819	* Get current time and calc end of wait time.
820	*/
821	struct timespec ts = {0,0};
822	clock_gettime(CLOCK_REALTIME, &ts);
823	if (cMillies != 0)
824	{
825	ts.tv_nsec += (cMillies % 1000) * 1000000;
826	ts.tv_sec += cMillies / 1000;
827	if (ts.tv_nsec >= 1000000000)
828	{
829	ts.tv_nsec -= 1000000000;
830	ts.tv_sec++;
831	}
832	}
833
834	/* take mutex */
835	int rc = pthread_mutex_timedlock(&pIntMutexSem->Mutex, &ts);
836	if (rc)
837	{
838	AssertMsg(rc == ETIMEDOUT, ("Failed to lock mutex sem %p, rc=%d.\n", MutexSem, rc)); NOREF(rc);
839	return RTErrConvertFromErrno(rc);
840	}
841	#endif /* !__DARWIN__ */
842	}
843
844	/*
845	* Set the owner and nesting.
846	*/
847	pIntMutexSem->Owner = Self;
848	ASMAtomicXchgU32(&pIntMutexSem->cNesting, 1);
849
850	return VINF_SUCCESS;
851	}
852
853
854	RTDECL(int) RTSemMutexRequestNoResume(RTSEMMUTEX MutexSem, unsigned cMillies)
855	{
856	/* EINTR isn't returned by the wait functions we're using. */
857	return RTSemMutexRequest(MutexSem, cMillies);
858	}
859
860
861	RTDECL(int) RTSemMutexRelease(RTSEMMUTEX MutexSem)
862	{
863	/*
864	* Validate input.
865	*/
866	if (!rtsemMutexValid(MutexSem))
867	{
868	AssertMsgFailed(("Invalid handle %p!\n", MutexSem));
869	return VERR_INVALID_HANDLE;
870	}
871
872	/*
873	* Check if nested.
874	*/
875	pthread_t Self = pthread_self();
876	struct RTSEMMUTEXINTERNAL *pIntMutexSem = MutexSem;
877	if ( pIntMutexSem->Owner != Self
878	\|\| pIntMutexSem->cNesting == (uint32_t)~0)
879	{
880	AssertMsgFailed(("Not owner of mutex %p!! Self=%08x Owner=%08x cNesting=%d\n",
881	pIntMutexSem, Self, pIntMutexSem->Owner, pIntMutexSem->cNesting));
882	return VERR_NOT_OWNER;
883	}
884
885	/*
886	* If nested we'll just pop a nesting.
887	*/
888	if (pIntMutexSem->cNesting > 1)
889	{
890	pIntMutexSem->cNesting--;
891	return VINF_SUCCESS;
892	}
893
894	/*
895	* Clear the state. (cNesting == 1)
896	*/
897	pIntMutexSem->Owner = (pthread_t)~0;
898	ASMAtomicXchgU32(&pIntMutexSem->cNesting, 0);
899
900	/*
901	* Unlock mutex semaphore.
902	*/
903	int rc = pthread_mutex_unlock(&pIntMutexSem->Mutex);
904	if (rc)
905	{
906	AssertMsgFailed(("Failed to unlock mutex sem %p, rc=%d.\n", MutexSem, rc)); NOREF(rc);
907	return RTErrConvertFromErrno(rc);
908	}
909
910	return VINF_SUCCESS;
911	}
912
913
914
915
916
917	/**
918	* Validate a read-write semaphore handle passed to one of the interface.
919	*
920	* @returns true if valid.
921	* @returns false if invalid.
922	* @param pIntRWSem Pointer to the read-write semaphore to validate.
923	*/
924	inline bool rtsemRWValid(struct RTSEMRWINTERNAL *pIntRWSem)
925	{
926	if ((uintptr_t)pIntRWSem < 0x10000)
927	return false;
928
929	if (pIntRWSem->uCheck != (unsigned)~0)
930	return false;
931
932	return true;
933	}
934
935
936	RTDECL(int) RTSemRWCreate(PRTSEMRW pRWSem)
937	{
938	int rc;
939
940	/*
941	* Allocate handle.
942	*/
943	struct RTSEMRWINTERNAL pIntRWSem = (struct RTSEMRWINTERNAL )RTMemAlloc(sizeof(struct RTSEMRWINTERNAL));
944	if (pIntRWSem)
945	{
946	/*
947	* Create the rwlock.
948	*/
949	pthread_rwlockattr_t Attr;
950	rc = pthread_rwlockattr_init(&Attr);
951	if (!rc)
952	{
953	rc = pthread_rwlock_init(&pIntRWSem->RWLock, &Attr);
954	if (!rc)
955	{
956	pIntRWSem->uCheck = ~0;
957	pIntRWSem->WROwner = (pthread_t)~0;
958	*pRWSem = pIntRWSem;
959	return VINF_SUCCESS;
960	}
961	}
962
963	rc = RTErrConvertFromErrno(rc);
964	RTMemFree(pIntRWSem);
965	}
966	else
967	rc = VERR_NO_MEMORY;
968
969	return rc;
970	}
971
972
973	RTDECL(int) RTSemRWDestroy(RTSEMRW RWSem)
974	{
975	/*
976	* Validate input.
977	*/
978	if (!rtsemRWValid(RWSem))
979	{
980	AssertMsgFailed(("Invalid handle %p!\n", RWSem));
981	return VERR_INVALID_HANDLE;
982	}
983
984	/*
985	* Try destroy it.
986	*/
987	struct RTSEMRWINTERNAL *pIntRWSem = RWSem;
988	int rc = pthread_rwlock_destroy(&pIntRWSem->RWLock);
989	if (!rc)
990	{
991	pIntRWSem->uCheck = 0;
992	RTMemFree(pIntRWSem);
993	rc = VINF_SUCCESS;
994	}
995	else
996	{
997	AssertMsgFailed(("Failed to destroy read-write sem %p, rc=%d.\n", RWSem, rc));
998	rc = RTErrConvertFromErrno(rc);
999	}
1000
1001	return rc;
1002	}
1003
1004
1005	RTDECL(int) RTSemRWRequestRead(RTSEMRW RWSem, unsigned cMillies)
1006	{
1007	/*
1008	* Validate input.
1009	*/
1010	if (!rtsemRWValid(RWSem))
1011	{
1012	AssertMsgFailed(("Invalid handle %p!\n", RWSem));
1013	return VERR_INVALID_HANDLE;
1014	}
1015
1016	/*
1017	* Try lock it.
1018	*/
1019	struct RTSEMRWINTERNAL *pIntRWSem = RWSem;
1020	if (cMillies == RT_INDEFINITE_WAIT)
1021	{
1022	/* take rwlock */
1023	int rc = pthread_rwlock_rdlock(&pIntRWSem->RWLock);
1024	if (rc)
1025	{
1026	AssertMsgFailed(("Failed read lock read-write sem %p, rc=%d.\n", RWSem, rc));
1027	return RTErrConvertFromErrno(rc);
1028	}
1029	}
1030	else
1031	{
1032	#ifdef __DARWIN__
1033	AssertMsgFailed(("Not implemented on Darwin yet because of incomplete pthreads API."));
1034	return VERR_NOT_IMPLEMENTED;
1035	#else /* !__DARWIN__ */
1036	/*
1037	* Get current time and calc end of wait time.
1038	*/
1039	struct timespec ts = {0,0};
1040	clock_gettime(CLOCK_REALTIME, &ts);
1041	if (cMillies != 0)
1042	{
1043	ts.tv_nsec += (cMillies % 1000) * 1000000;
1044	ts.tv_sec += cMillies / 1000;
1045	if (ts.tv_nsec >= 1000000000)
1046	{
1047	ts.tv_nsec -= 1000000000;
1048	ts.tv_sec++;
1049	}
1050	}
1051
1052	/* take rwlock */
1053	int rc = pthread_rwlock_timedrdlock(&pIntRWSem->RWLock, &ts);
1054	if (rc)
1055	{
1056	AssertMsg(rc == ETIMEDOUT, ("Failed read lock read-write sem %p, rc=%d.\n", RWSem, rc));
1057	return RTErrConvertFromErrno(rc);
1058	}
1059	#endif /* !__DARWIN__ */
1060	}
1061
1062	return VINF_SUCCESS;
1063	}
1064
1065
1066	RTDECL(int) RTSemRWRequestReadNoResume(RTSEMRW RWSem, unsigned cMillies)
1067	{
1068	/* EINTR isn't returned by the wait functions we're using. */
1069	return RTSemRWRequestRead(RWSem, cMillies);
1070	}
1071
1072
1073	RTDECL(int) RTSemRWReleaseRead(RTSEMRW RWSem)
1074	{
1075	/*
1076	* Validate input.
1077	*/
1078	if (!rtsemRWValid(RWSem))
1079	{
1080	AssertMsgFailed(("Invalid handle %p!\n", RWSem));
1081	return VERR_INVALID_HANDLE;
1082	}
1083
1084	/*
1085	* Try unlock it.
1086	*/
1087	struct RTSEMRWINTERNAL *pIntRWSem = RWSem;
1088	if (pIntRWSem->WROwner == pthread_self())
1089	{
1090	AssertMsgFailed(("Tried to read unlock when write owner - read-write sem %p.\n", RWSem));
1091	return VERR_NOT_OWNER;
1092	}
1093	int rc = pthread_rwlock_unlock(&pIntRWSem->RWLock);
1094	if (rc)
1095	{
1096	AssertMsgFailed(("Failed read unlock read-write sem %p, rc=%d.\n", RWSem, rc));
1097	return RTErrConvertFromErrno(rc);
1098	}
1099
1100	return VINF_SUCCESS;
1101	}
1102
1103
1104	RTDECL(int) RTSemRWRequestWrite(RTSEMRW RWSem, unsigned cMillies)
1105	{
1106	/*
1107	* Validate input.
1108	*/
1109	if (!rtsemRWValid(RWSem))
1110	{
1111	AssertMsgFailed(("Invalid handle %p!\n", RWSem));
1112	return VERR_INVALID_HANDLE;
1113	}
1114
1115	/*
1116	* Try lock it.
1117	*/
1118	struct RTSEMRWINTERNAL *pIntRWSem = RWSem;
1119	if (cMillies == RT_INDEFINITE_WAIT)
1120	{
1121	/* take rwlock */
1122	int rc = pthread_rwlock_wrlock(&pIntRWSem->RWLock);
1123	if (rc)
1124	{
1125	AssertMsgFailed(("Failed write lock read-write sem %p, rc=%d.\n", RWSem, rc));
1126	return RTErrConvertFromErrno(rc);
1127	}
1128	}
1129	else
1130	{
1131	#ifdef __DARWIN__
1132	AssertMsgFailed(("Not implemented on Darwin yet because of incomplete pthreads API."));
1133	return VERR_NOT_IMPLEMENTED;
1134	#else /* !__DARWIN__ */
1135	/*
1136	* Get current time and calc end of wait time.
1137	*/
1138	struct timespec ts = {0,0};
1139	clock_gettime(CLOCK_REALTIME, &ts);
1140	if (cMillies != 0)
1141	{
1142	ts.tv_nsec += (cMillies % 1000) * 1000000;
1143	ts.tv_sec += cMillies / 1000;
1144	if (ts.tv_nsec >= 1000000000)
1145	{
1146	ts.tv_nsec -= 1000000000;
1147	ts.tv_sec++;
1148	}
1149	}
1150
1151	/* take rwlock */
1152	int rc = pthread_rwlock_timedwrlock(&pIntRWSem->RWLock, &ts);
1153	if (rc)
1154	{
1155	AssertMsg(rc == ETIMEDOUT, ("Failed read lock read-write sem %p, rc=%d.\n", RWSem, rc));
1156	return RTErrConvertFromErrno(rc);
1157	}
1158	#endif /* !__DARWIN__ */
1159	}
1160
1161	ASMAtomicXchgPtr((void * volatile )&pIntRWSem->WROwner, (void )pthread_self());
1162
1163	return VINF_SUCCESS;
1164	}
1165
1166
1167	RTDECL(int) RTSemRWRequestWriteNoResume(RTSEMRW RWSem, unsigned cMillies)
1168	{
1169	/* EINTR isn't returned by the wait functions we're using. */
1170	return RTSemRWRequestWrite(RWSem, cMillies);
1171	}
1172
1173
1174	RTDECL(int) RTSemRWReleaseWrite(RTSEMRW RWSem)
1175	{
1176	/*
1177	* Validate input.
1178	*/
1179	if (!rtsemRWValid(RWSem))
1180	{
1181	AssertMsgFailed(("Invalid handle %p!\n", RWSem));
1182	return VERR_INVALID_HANDLE;
1183	}
1184
1185	/*
1186	* Try unlock it.
1187	*/
1188	pthread_t Self = pthread_self();
1189	struct RTSEMRWINTERNAL *pIntRWSem = RWSem;
1190	if (pIntRWSem->WROwner != Self)
1191	{
1192	AssertMsgFailed(("Not Write owner!\n"));
1193	return VERR_NOT_OWNER;
1194	}
1195
1196	/*
1197	* Try unlock it.
1198	*/
1199	AssertMsg(sizeof(pthread_t) == sizeof(void *), ("pthread_t is not the size of a pointer but %d bytes\n", sizeof(pthread_t)));
1200	ASMAtomicXchgPtr((void * volatile )&pIntRWSem->WROwner, (void )(uintptr_t)~0);
1201	int rc = pthread_rwlock_unlock(&pIntRWSem->RWLock);
1202	if (rc)
1203	{
1204	AssertMsgFailed(("Failed write unlock read-write sem %p, rc=%d.\n", RWSem, rc));
1205	return RTErrConvertFromErrno(rc);
1206	}
1207
1208	return VINF_SUCCESS;
1209	}
1210

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source: vbox/trunk/src/VBox/Runtime/r3/posix/sems-posix.cpp@ 1

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