thread-posix.cpp

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1	/* $Id: thread-posix.cpp 106061 2024-09-16 14:03:52Z vboxsync $ */
2	/** @file
3	* IPRT - Threads, POSIX.
4	*/
5
6	/*
7	* Copyright (C) 2006-2024 Oracle and/or its affiliates.
8	*
9	* This file is part of VirtualBox base platform packages, as
10	* available from https://www.virtualbox.org.
11	*
12	* This program is free software; you can redistribute it and/or
13	* modify it under the terms of the GNU General Public License
14	* as published by the Free Software Foundation, in version 3 of the
15	* License.
16	*
17	* This program is distributed in the hope that it will be useful, but
18	* WITHOUT ANY WARRANTY; without even the implied warranty of
19	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20	* General Public License for more details.
21	*
22	* You should have received a copy of the GNU General Public License
23	* along with this program; if not, see <https://www.gnu.org/licenses>.
24	*
25	* The contents of this file may alternatively be used under the terms
26	* of the Common Development and Distribution License Version 1.0
27	* (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
28	* in the VirtualBox distribution, in which case the provisions of the
29	* CDDL are applicable instead of those of the GPL.
30	*
31	* You may elect to license modified versions of this file under the
32	* terms and conditions of either the GPL or the CDDL or both.
33	*
34	* SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
35	*/
36
37
38	/*********************************************************************************************************************************
39	* Header Files *
40	*********************************************************************************************************************************/
41	#define LOG_GROUP RTLOGGROUP_THREAD
42	#include <errno.h>
43	#include <limits.h>
44	#include <pthread.h>
45	#include <signal.h>
46	#include <stdlib.h>
47	#if defined(RT_OS_LINUX)
48	# include <unistd.h>
49	# include <sys/syscall.h>
50	#endif
51	#if defined(RT_OS_SOLARIS)
52	# include <sched.h>
53	# include <sys/resource.h>
54	#endif
55	#if defined(RT_OS_DARWIN)
56	# include <mach/thread_act.h>
57	# include <mach/thread_info.h>
58	# include <mach/host_info.h>
59	# include <mach/mach_init.h>
60	# include <mach/mach_host.h>
61	#endif
62	#if defined(RT_OS_DARWIN) /\|\| defined(RT_OS_FREEBSD) - later / \
63	\|\| (defined(RT_OS_LINUX) && !defined(IN_RT_STATIC) /* static + dlsym = trouble */) \
64	\|\| defined(IPRT_MAY_HAVE_PTHREAD_SET_NAME_NP)
65	# define IPRT_MAY_HAVE_PTHREAD_SET_NAME_NP
66	# include <dlfcn.h>
67	#endif
68	#if defined(RT_OS_HAIKU)
69	# include <OS.h>
70	#endif
71	#if defined(RT_OS_DARWIN)
72	# define sigprocmask pthread_sigmask /* On xnu sigprocmask works on the process, not the calling thread as elsewhere. */
73	#endif
74
75	#include <iprt/thread.h>
76	#include <iprt/log.h>
77	#include <iprt/assert.h>
78	#include <iprt/asm.h>
79	#include <iprt/err.h>
80	#include <iprt/initterm.h>
81	#include <iprt/string.h>
82	#include <iprt/semaphore.h>
83	#include <iprt/list.h>
84	#include <iprt/once.h>
85	#include <iprt/critsect.h>
86	#include <iprt/req.h>
87	#include "internal/thread.h"
88
89
90	/*********************************************************************************************************************************
91	* Defined Constants And Macros *
92	*********************************************************************************************************************************/
93	/#ifndef IN_GUEST - shouldn't need to exclude this now with the non-obtrusive init option. /
94	/** Includes RTThreadPoke. */
95	# define RTTHREAD_POSIX_WITH_POKE
96	/#endif/
97
98
99	/*********************************************************************************************************************************
100	* Global Variables *
101	*********************************************************************************************************************************/
102	/** The pthread key in which we store the pointer to our own PRTTHREAD structure.
103	* @note There is a defined NIL value here, nor can we really assume this is an
104	* integer. However, zero is a valid key on Linux, so we get into trouble
105	* if we accidentally use it uninitialized.
106	*
107	* So, we ASSUME it's a integer value and the valid range is in approx 0
108	* to PTHREAD_KEYS_MAX. Solaris has at least one negative value (-1)
109	* defined. Thus, we go for 16 MAX values below zero and keep our fingers
110	* cross that it will always be an invalid key value everywhere...
111	*
112	* See also NIL_RTTLS, which is -1.
113	*/
114	static pthread_key_t g_SelfKey = (pthread_key_t)(-PTHREAD_KEYS_MAX * 16);
115	#ifdef RTTHREAD_POSIX_WITH_POKE
116	/** The signal we use for poking threads.
117	* This is set to -1 if no available signal was found. */
118	static int volatile g_iSigPokeThread = -1;
119	#endif
120
121	#ifdef IPRT_MAY_HAVE_PTHREAD_SET_NAME_NP
122	# if defined(RT_OS_DARWIN)
123	/**
124	* The Mac OS X (10.6 and later) variant of pthread_setname_np.
125	*
126	* @returns errno.h
127	* @param pszName The new thread name.
128	*/
129	typedef int (PFNPTHREADSETNAME)(const char pszName);
130	# else
131	/**
132	* The variant of pthread_setname_np most other unix-like systems implement.
133	*
134	* @returns errno.h
135	* @param hThread The thread.
136	* @param pszName The new thread name.
137	*/
138	typedef int (PFNPTHREADSETNAME)(pthread_t hThread, const char pszName);
139	# endif
140
141	/** Pointer to pthread_setname_np if found. */
142	static PFNPTHREADSETNAME g_pfnThreadSetName = NULL;
143	#endif /* IPRT_MAY_HAVE_PTHREAD_SET_NAME_NP */
144
145	#ifdef RTTHREAD_POSIX_WITH_CREATE_PRIORITY_PROXY
146	/** Atomic indicator of whether the priority proxy thread has been (attempted) started.
147	*
148	* The priority proxy thread is started under these circumstances:
149	* - RTThreadCreate
150	* - RTThreadSetType
151	* - RTProcSetPriority
152	*
153	* Which means that we'll be single threaded when this is modified.
154	*
155	* Speical values:
156	* - VERR_TRY_AGAIN: Not yet started.
157	* - VERR_WRONG_ORDER: Starting.
158	* - VINF_SUCCESS: Started successfully.
159	* - VERR_PROCESS_NOT_FOUND: Stopping or stopped
160	* - Other error status if failed to start.
161	*
162	* @note We could potentially optimize this by only start it when we lower the
163	* priority of ourselves, the process, or a newly created thread. But
164	* that would means we would need to take multi-threading into account, so
165	* let's not do that for now.
166	*/
167	static int32_t volatile g_rcPriorityProxyThreadStart = VERR_TRY_AGAIN;
168	/** The IPRT thread handle for the priority proxy. */
169	static RTTHREAD g_hRTThreadPosixPriorityProxyThread = NIL_RTTHREAD;
170	/** The priority proxy queue. */
171	static RTREQQUEUE g_hRTThreadPosixPriorityProxyQueue = NIL_RTREQQUEUE;
172	#endif /* RTTHREAD_POSIX_WITH_CREATE_PRIORITY_PROXY */
173
174
175	/*********************************************************************************************************************************
176	* Internal Functions *
177	*********************************************************************************************************************************/
178	static void rtThreadNativeMain(void pvArgs);
179	static void rtThreadKeyDestruct(void *pvValue);
180	#ifdef RTTHREAD_POSIX_WITH_POKE
181	static void rtThreadPosixPokeSignal(int iSignal);
182	#endif
183
184
185	#ifdef RTTHREAD_POSIX_WITH_POKE
186	/**
187	* Try register the dummy signal handler for RTThreadPoke.
188	*/
189	static void rtThreadPosixSelectPokeSignal(void)
190	{
191	/*
192	* Note! Avoid SIGRTMIN thru SIGRTMIN+2 because of LinuxThreads.
193	*/
194	# if !defined(RT_OS_LINUX) && !defined(RT_OS_SOLARIS) /* glibc defines SIGRTMAX to __libc_current_sigrtmax() and Solaris libc defines it relying on _sysconf(), causing compiler to deploy serialization here. */
195	static
196	# endif
197	const int s_aiSigCandidates[] =
198	{
199	# ifdef SIGRTMAX
200	SIGRTMAX-3,
201	SIGRTMAX-2,
202	SIGRTMAX-1,
203	# endif
204	# ifndef RT_OS_SOLARIS
205	SIGUSR2,
206	# endif
207	SIGWINCH
208	};
209
210	g_iSigPokeThread = -1;
211	if (!RTR3InitIsUnobtrusive())
212	{
213	for (unsigned iSig = 0; iSig < RT_ELEMENTS(s_aiSigCandidates); iSig++)
214	{
215	struct sigaction SigActOld;
216	if (!sigaction(s_aiSigCandidates[iSig], NULL, &SigActOld))
217	{
218	if ( SigActOld.sa_handler == SIG_DFL
219	\|\| SigActOld.sa_handler == rtThreadPosixPokeSignal)
220	{
221	struct sigaction SigAct;
222	RT_ZERO(SigAct);
223	SigAct.sa_handler = rtThreadPosixPokeSignal;
224	SigAct.sa_flags = 0; /* no SA_RESTART! */
225	sigfillset(&SigAct.sa_mask);
226
227	/* ASSUMES no sigaction race... (lazy bird) */
228	if (!sigaction(s_aiSigCandidates[iSig], &SigAct, NULL))
229	{
230	g_iSigPokeThread = s_aiSigCandidates[iSig];
231	break;
232	}
233	AssertMsgFailed(("rc=%Rrc errno=%d\n", RTErrConvertFromErrno(errno), errno));
234	}
235	}
236	else
237	AssertMsgFailed(("rc=%Rrc errno=%d\n", RTErrConvertFromErrno(errno), errno));
238	}
239	}
240	}
241	#endif /* RTTHREAD_POSIX_WITH_POKE */
242
243
244	DECLHIDDEN(int) rtThreadNativeInit(void)
245	{
246	/*
247	* Allocate the TLS (key in posix terms) where we store the pointer to
248	* a threads RTTHREADINT structure.
249	*/
250	int rc = pthread_key_create(&g_SelfKey, rtThreadKeyDestruct);
251	if (rc)
252	return VERR_NO_TLS_FOR_SELF;
253
254	#ifdef RTTHREAD_POSIX_WITH_POKE
255	rtThreadPosixSelectPokeSignal();
256	#endif
257
258	#ifdef IPRT_MAY_HAVE_PTHREAD_SET_NAME_NP
259	if (RT_SUCCESS(rc))
260	g_pfnThreadSetName = (PFNPTHREADSETNAME)(uintptr_t)dlsym(RTLD_DEFAULT, "pthread_setname_np");
261	#endif
262	return rc;
263	}
264
265	static void rtThreadPosixBlockSignals(PRTTHREADINT pThread)
266	{
267	/*
268	* Mask all signals, including the poke one, if requested.
269	*/
270	if ( pThread
271	&& (pThread->fFlags & RTTHREADFLAGS_NO_SIGNALS))
272	{
273	sigset_t SigSet;
274	sigfillset(&SigSet);
275	sigdelset(&SigSet, SIGILL); /* On the m1 we end up spinning on UDF ... */
276	sigdelset(&SigSet, SIGTRAP); /* ... and BRK instruction if these signals are masked. */
277	sigdelset(&SigSet, SIGFPE); /* Just adding the rest here to be on the safe side. */
278	sigdelset(&SigSet, SIGBUS);
279	sigdelset(&SigSet, SIGSEGV);
280	int rc = sigprocmask(SIG_BLOCK, &SigSet, NULL);
281	AssertMsg(rc == 0, ("rc=%Rrc errno=%d\n", RTErrConvertFromErrno(errno), errno)); RT_NOREF(rc);
282	}
283	/*
284	* Block SIGALRM - required for timer-posix.cpp.
285	* This is done to limit harm done by OSes which doesn't do special SIGALRM scheduling.
286	* It will not help much if someone creates threads directly using pthread_create. :/
287	*/
288	else if (!RTR3InitIsUnobtrusive())
289	{
290	sigset_t SigSet;
291	sigemptyset(&SigSet);
292	sigaddset(&SigSet, SIGALRM);
293	sigprocmask(SIG_BLOCK, &SigSet, NULL);
294	}
295
296	#ifdef RTTHREAD_POSIX_WITH_POKE
297	/*
298	* bird 2020-10-28: Not entirely sure why we do this, but it makes sure the signal works
299	* on the new thread. Probably some pre-NPTL linux reasons.
300	*/
301	if (g_iSigPokeThread != -1)
302	{
303	# if 1 /* siginterrupt() is typically implemented as two sigaction calls, this should be faster and w/o deprecations: */
304	struct sigaction SigActOld;
305	RT_ZERO(SigActOld);
306
307	struct sigaction SigAct;
308	RT_ZERO(SigAct);
309	SigAct.sa_handler = rtThreadPosixPokeSignal;
310	SigAct.sa_flags = 0; /* no SA_RESTART! */
311	sigfillset(&SigAct.sa_mask);
312
313	int rc = sigaction(g_iSigPokeThread, &SigAct, &SigActOld);
314	AssertMsg(rc == 0, ("rc=%Rrc errno=%d\n", RTErrConvertFromErrno(errno), errno)); RT_NOREF(rc);
315	AssertMsg(rc \|\| SigActOld.sa_handler == rtThreadPosixPokeSignal, ("%p\n", SigActOld.sa_handler));
316	# else
317	siginterrupt(g_iSigPokeThread, 1);
318	# endif
319	}
320	#endif
321	}
322
323	DECLHIDDEN(void) rtThreadNativeReInitObtrusive(void)
324	{
325	#ifdef RTTHREAD_POSIX_WITH_POKE
326	Assert(!RTR3InitIsUnobtrusive());
327	rtThreadPosixSelectPokeSignal();
328	#endif
329	rtThreadPosixBlockSignals(NULL);
330	}
331
332
333	/**
334	* Destructor called when a thread terminates.
335	* @param pvValue The key value. PRTTHREAD in our case.
336	*/
337	static void rtThreadKeyDestruct(void *pvValue)
338	{
339	/*
340	* Deal with alien threads.
341	*/
342	PRTTHREADINT pThread = (PRTTHREADINT)pvValue;
343	if (pThread->fIntFlags & RTTHREADINT_FLAGS_ALIEN)
344	{
345	pthread_setspecific(g_SelfKey, pThread);
346	rtThreadTerminate(pThread, 0);
347	pthread_setspecific(g_SelfKey, NULL);
348	}
349	}
350
351
352	#ifdef RTTHREAD_POSIX_WITH_POKE
353	/**
354	* Dummy signal handler for the poke signal.
355	*
356	* @param iSignal The signal number.
357	*/
358	static void rtThreadPosixPokeSignal(int iSignal)
359	{
360	Assert(iSignal == g_iSigPokeThread);
361	NOREF(iSignal);
362	}
363	#endif
364
365
366	/**
367	* Adopts a thread, this is called immediately after allocating the
368	* thread structure.
369	*
370	* @param pThread Pointer to the thread structure.
371	*/
372	DECLHIDDEN(int) rtThreadNativeAdopt(PRTTHREADINT pThread)
373	{
374	rtThreadPosixBlockSignals(pThread);
375
376	int rc = pthread_setspecific(g_SelfKey, pThread);
377	if (!rc)
378	return VINF_SUCCESS;
379	return VERR_FAILED_TO_SET_SELF_TLS;
380	}
381
382
383	DECLHIDDEN(void) rtThreadNativeDestroy(PRTTHREADINT pThread)
384	{
385	if (pThread == (PRTTHREADINT)pthread_getspecific(g_SelfKey))
386	pthread_setspecific(g_SelfKey, NULL);
387	}
388
389
390	/**
391	* Wrapper which unpacks the params and calls thread function.
392	*/
393	static void rtThreadNativeMain(void pvArgs)
394	{
395	PRTTHREADINT pThread = (PRTTHREADINT)pvArgs;
396	pthread_t Self = pthread_self();
397	#if !defined(RT_OS_SOLARIS) /* On Solaris sizeof(pthread_t) = 4 and sizeof(NIL_RTNATIVETHREAD) = 8 */
398	Assert((uintptr_t)Self != NIL_RTNATIVETHREAD);
399	#endif
400	Assert(Self == (pthread_t)(RTNATIVETHREAD)Self);
401
402	#if defined(RT_OS_LINUX)
403	/*
404	* Set the TID.
405	*/
406	pThread->tid = syscall(__NR_gettid);
407	ASMMemoryFence();
408	#endif
409
410	rtThreadPosixBlockSignals(pThread);
411
412	/*
413	* Set the TLS entry and, if possible, the thread name.
414	*/
415	int rc = pthread_setspecific(g_SelfKey, pThread);
416	AssertReleaseMsg(!rc, ("failed to set self TLS. rc=%d thread '%s'\n", rc, pThread->szName));
417
418	#ifdef IPRT_MAY_HAVE_PTHREAD_SET_NAME_NP
419	if (g_pfnThreadSetName)
420	# ifdef RT_OS_DARWIN
421	g_pfnThreadSetName(pThread->szName);
422	# else
423	g_pfnThreadSetName(Self, pThread->szName);
424	# endif
425	#endif
426
427	/*
428	* Call common main.
429	*/
430	rc = rtThreadMain(pThread, (uintptr_t)Self, &pThread->szName[0]);
431
432	pthread_setspecific(g_SelfKey, NULL);
433	pthread_exit((void *)(intptr_t)rc);
434	return (void *)(intptr_t)rc;
435	}
436
437	#ifdef RTTHREAD_POSIX_WITH_CREATE_PRIORITY_PROXY
438
439	/**
440	* @callback_method_impl{FNRTTHREAD,
441	* Priority proxy thread that services g_hRTThreadPosixPriorityProxyQueue.}
442	*/
443	static DECLCALLBACK(int) rtThreadPosixPriorityProxyThread(PRTTHREADINT, void *)
444	{
445	for (;;)
446	{
447	RTREQQUEUE hReqQueue = g_hRTThreadPosixPriorityProxyQueue;
448	if (hReqQueue != NIL_RTREQQUEUE)
449	RTReqQueueProcess(hReqQueue, RT_INDEFINITE_WAIT);
450	else
451	break;
452
453	int32_t rc = ASMAtomicUoReadS32(&g_rcPriorityProxyThreadStart);
454	if (rc != VINF_SUCCESS && rc != VERR_WRONG_ORDER)
455	break;
456	}
457
458	return VINF_SUCCESS;
459	}
460
461
462	/**
463	* Just returns a non-success status codes to force the thread to re-evaluate
464	* the global shutdown variable.
465	*/
466	static DECLCALLBACK(int) rtThreadPosixPriorityProxyStopper(void)
467	{
468	return VERR_CANCELLED;
469	}
470
471
472	/**
473	* An atexit() callback that stops the proxy creation/priority thread.
474	*/
475	static void rtThreadStopProxyThread(void)
476	{
477	/*
478	* Signal to the thread that it's time to shut down.
479	*/
480	int32_t rc = ASMAtomicXchgS32(&g_rcPriorityProxyThreadStart, VERR_PROCESS_NOT_FOUND);
481	if (RT_SUCCESS(rc))
482	{
483	/*
484	* Grab the associated handles.
485	*/
486	RTTHREAD hThread = g_hRTThreadPosixPriorityProxyThread;
487	RTREQQUEUE hQueue = g_hRTThreadPosixPriorityProxyQueue;
488	g_hRTThreadPosixPriorityProxyQueue = NIL_RTREQQUEUE;
489	g_hRTThreadPosixPriorityProxyThread = NIL_RTTHREAD;
490	ASMCompilerBarrier(); /* paranoia */
491
492	AssertReturnVoid(hThread != NIL_RTTHREAD);
493	AssertReturnVoid(hQueue != NIL_RTREQQUEUE);
494
495	/*
496	* Kick the thread so it gets out of any pending RTReqQueueProcess call ASAP.
497	*/
498	rc = RTReqQueueCallEx(hQueue, NULL, 0 /cMillies/, RTREQFLAGS_IPRT_STATUS \| RTREQFLAGS_NO_WAIT,
499	(PFNRT)rtThreadPosixPriorityProxyStopper, 0);
500
501	/*
502	* Wait for the thread to complete.
503	*/
504	rc = RTThreadWait(hThread, RT_SUCCESS(rc) ? RT_MS_1SEC * 5 : 32, NULL);
505	if (RT_SUCCESS(rc))
506	RTReqQueueDestroy(hQueue);
507	/* else: just leak the stuff, we're exitting, so nobody cares... */
508	}
509	}
510
511
512	/**
513	* Ensure that the proxy priority proxy thread has been started.
514	*
515	* Since we will always start a proxy thread when asked to create a thread,
516	* there is no need for serialization here.
517	*
518	* @retval true if started
519	* @retval false if it failed to start (caller must handle this scenario).
520	*/
521	DECLHIDDEN(bool) rtThreadPosixPriorityProxyStart(void)
522	{
523	/*
524	* Read the result.
525	*/
526	int rc = ASMAtomicUoReadS32(&g_rcPriorityProxyThreadStart);
527	if (rc != VERR_TRY_AGAIN)
528	return RT_SUCCESS(rc);
529
530	/* If this triggers then there is a very unexpected race somewhere. It
531	should be harmless though. */
532	AssertReturn(ASMAtomicCmpXchgS32(&g_rcPriorityProxyThreadStart, VERR_WRONG_ORDER, VERR_TRY_AGAIN), false);
533
534	/*
535	* Not yet started, so do that.
536	*/
537	rc = RTReqQueueCreate(&g_hRTThreadPosixPriorityProxyQueue);
538	if (RT_SUCCESS(rc))
539	{
540	rc = RTThreadCreate(&g_hRTThreadPosixPriorityProxyThread, rtThreadPosixPriorityProxyThread, NULL, 0 /cbStack/,
541	RTTHREADTYPE_DEFAULT, RTTHREADFLAGS_WAITABLE, "RTThrdPP");
542	if (RT_SUCCESS(rc))
543	{
544	ASMAtomicWriteS32(&g_rcPriorityProxyThreadStart, VINF_SUCCESS);
545
546	atexit(rtThreadStopProxyThread);
547	return true;
548	}
549	RTReqQueueCreate(&g_hRTThreadPosixPriorityProxyQueue);
550	}
551	ASMAtomicWriteS32(&g_rcPriorityProxyThreadStart, rc != VERR_WRONG_ORDER ? rc : VERR_PROCESS_NOT_FOUND);
552	return false;
553	}
554
555
556	/**
557	* Calls @a pfnFunction from the priority proxy thread.
558	*
559	* Caller must have called rtThreadPosixStartProxy() to check that the priority
560	* proxy thread is running.
561	*
562	* @returns
563	* @param pTargetThread The target thread, NULL if not applicable. This is
564	* so we can skip calls pertaining to the priority
565	* proxy thread itself.
566	* @param pfnFunction The function to call. Must return IPRT status code.
567	* @param cArgs Number of arguments (see also RTReqQueueCall).
568	* @param ... Arguments (see also RTReqQueueCall).
569	*/
570	DECLHIDDEN(int) rtThreadPosixPriorityProxyCall(PRTTHREADINT pTargetThread, PFNRT pfnFunction, int cArgs, ...)
571	{
572	int rc;
573	if ( !pTargetThread
574	\|\| pTargetThread->pfnThread != rtThreadPosixPriorityProxyThread)
575	{
576	va_list va;
577	va_start(va, cArgs);
578	PRTREQ pReq;
579	rc = RTReqQueueCallV(g_hRTThreadPosixPriorityProxyQueue, &pReq, RT_INDEFINITE_WAIT, RTREQFLAGS_IPRT_STATUS,
580	pfnFunction, cArgs, va);
581	va_end(va);
582	RTReqRelease(pReq);
583	}
584	else
585	rc = VINF_SUCCESS;
586	return rc;
587	}
588
589	#endif /* !RTTHREAD_POSIX_WITH_CREATE_PRIORITY_PROXY */
590
591	/**
592	* Worker for rtThreadNativeCreate that's either called on the priority proxy
593	* thread or directly on the calling thread depending on the proxy state.
594	*/
595	static DECLCALLBACK(int) rtThreadNativeInternalCreate(PRTTHREADINT pThread, PRTNATIVETHREAD pNativeThread)
596	{
597	/*
598	* Set the default stack size.
599	*/
600	if (!pThread->cbStack)
601	pThread->cbStack = 512*1024;
602
603	#ifdef RT_OS_LINUX
604	pThread->tid = -1;
605	#endif
606
607	/*
608	* Setup thread attributes.
609	*/
610	pthread_attr_t ThreadAttr;
611	int rc = pthread_attr_init(&ThreadAttr);
612	if (!rc)
613	{
614	rc = pthread_attr_setdetachstate(&ThreadAttr, PTHREAD_CREATE_DETACHED);
615	if (!rc)
616	{
617	rc = pthread_attr_setstacksize(&ThreadAttr, pThread->cbStack);
618	if (!rc)
619	{
620	/*
621	* Create the thread.
622	*/
623	pthread_t ThreadId;
624	rc = pthread_create(&ThreadId, &ThreadAttr, rtThreadNativeMain, pThread);
625	if (!rc)
626	{
627	pthread_attr_destroy(&ThreadAttr);
628	*pNativeThread = (uintptr_t)ThreadId;
629	return VINF_SUCCESS;
630	}
631	}
632	}
633	pthread_attr_destroy(&ThreadAttr);
634	}
635	return RTErrConvertFromErrno(rc);
636	}
637
638
639	DECLHIDDEN(int) rtThreadNativeCreate(PRTTHREADINT pThread, PRTNATIVETHREAD pNativeThread)
640	{
641	#ifdef RTTHREAD_POSIX_WITH_CREATE_PRIORITY_PROXY
642	/*
643	* If we have a priority proxy thread, use it. Make sure to ignore the
644	* staring of the proxy thread itself.
645	*/
646	if ( pThread->pfnThread != rtThreadPosixPriorityProxyThread
647	&& rtThreadPosixPriorityProxyStart())
648	{
649	PRTREQ pReq;
650	int rc = RTReqQueueCall(g_hRTThreadPosixPriorityProxyQueue, &pReq, RT_INDEFINITE_WAIT,
651	(PFNRT)rtThreadNativeInternalCreate, 2, pThread, pNativeThread);
652	if (RT_SUCCESS(rc))
653	rc = RTReqGetStatus(pReq);
654	RTReqRelease(pReq);
655	return rc;
656	}
657
658	/*
659	* Fall back on creating it directly without regard to priority proxying.
660	*/
661	#endif
662	return rtThreadNativeInternalCreate(pThread, pNativeThread);
663	}
664
665
666	RTDECL(RTTHREAD) RTThreadSelf(void)
667	{
668	/** @todo import alien threads? */
669	#if defined(RT_OS_DARWIN)
670	/* On darwin, there seems to be input checking with pthread_getspecific.
671	So, we must prevent using g_SelfKey before rtThreadNativeInit has run,
672	otherwise we might crash or starting working with total garbage pointer
673	values here (see _os_tsd_get_direct in znu/libsyscall/os/tsd.h).
674
675	Now, since the init value is a "negative" one, we just have to check
676	that it's positive or zero before calling the API. */
677	if (RT_LIKELY((intptr_t)g_SelfKey >= 0))
678	return (PRTTHREADINT)pthread_getspecific(g_SelfKey);
679	return NIL_RTTHREAD;
680	#else
681	return (PRTTHREADINT)pthread_getspecific(g_SelfKey);
682	#endif
683	}
684
685
686	#ifdef RTTHREAD_POSIX_WITH_POKE
687
688	RTDECL(int) RTThreadPoke(RTTHREAD hThread)
689	{
690	AssertReturn(hThread != RTThreadSelf(), VERR_INVALID_PARAMETER);
691	PRTTHREADINT pThread = rtThreadGet(hThread);
692	AssertReturn(pThread, VERR_INVALID_HANDLE);
693
694	int rc;
695	if (g_iSigPokeThread != -1)
696	{
697	rc = pthread_kill((pthread_t)(uintptr_t)pThread->Core.Key, g_iSigPokeThread);
698	rc = RTErrConvertFromErrno(rc);
699	}
700	else
701	rc = VERR_NOT_SUPPORTED;
702
703	rtThreadRelease(pThread);
704	return rc;
705	}
706
707
708	RTDECL(int) RTThreadControlPokeSignal(RTTHREAD hThread, bool fEnable)
709	{
710	AssertReturn(hThread == RTThreadSelf() && hThread != NIL_RTTHREAD, VERR_INVALID_PARAMETER);
711	int rc;
712	if (g_iSigPokeThread != -1)
713	{
714	sigset_t SigSet;
715	sigemptyset(&SigSet);
716	sigaddset(&SigSet, g_iSigPokeThread);
717
718	int rc2 = sigprocmask(fEnable ? SIG_UNBLOCK : SIG_BLOCK, &SigSet, NULL);
719	if (rc2 == 0)
720	rc = VINF_SUCCESS;
721	else
722	{
723	rc = RTErrConvertFromErrno(errno);
724	AssertMsgFailed(("rc=%Rrc errno=%d (rc2=%d)\n", rc, errno, rc2));
725	}
726	}
727	else
728	rc = VERR_NOT_SUPPORTED;
729	return rc;
730	}
731
732
733	#endif
734
735	/** @todo move this into platform specific files. */
736	RTR3DECL(int) RTThreadGetExecutionTimeMilli(uint64_t pcMsKernelTime, uint64_t pcMsUserTime)
737	{
738	#if defined(RT_OS_SOLARIS)
739	struct rusage ts;
740	int const rc = getrusage(RUSAGE_LWP, &ts);
741	AssertReturn(rc == 0, RTErrConvertFromErrno(rc));
742
743	pcMsKernelTime = ts.ru_stime.tv_sec 1000 + ts.ru_stime.tv_usec / 1000;
744	pcMsUserTime = ts.ru_utime.tv_sec 1000 + ts.ru_utime.tv_usec / 1000;
745	return VINF_SUCCESS;
746
747	#elif defined(RT_OS_LINUX) \|\| defined(RT_OS_FREEBSD)
748	/* on Linux, getrusage(RUSAGE_THREAD, ...) is available since 2.6.26. maybe it's slower? */
749	struct timespec ts;
750	int const rc = clock_gettime(CLOCK_THREAD_CPUTIME_ID, &ts);
751	AssertReturn(rc == 0, RTErrConvertFromErrno(rc));
752
753	*pcMsKernelTime = 0;
754	pcMsUserTime = (uint64_t)ts.tv_sec 1000 + ts.tv_nsec / 1000000;
755	return VINF_SUCCESS;
756
757	#elif defined(RT_OS_DARWIN)
758	thread_basic_info ThreadInfo;
759	mach_msg_type_number_t Count = THREAD_BASIC_INFO_COUNT;
760	kern_return_t krc = thread_info(mach_thread_self(), THREAD_BASIC_INFO, (thread_info_t)&ThreadInfo, &Count);
761	AssertReturn(krc == KERN_SUCCESS, RTErrConvertFromDarwinKern(krc));
762
763	pcMsKernelTime = ThreadInfo.system_time.seconds 1000 + ThreadInfo.system_time.microseconds / 1000;
764	pcMsUserTime = ThreadInfo.user_time.seconds 1000 + ThreadInfo.user_time.microseconds / 1000;
765	return VINF_SUCCESS;
766
767	#elif defined(RT_OS_HAIKU)
768	thread_info ThreadInfo;
769	status_t status = get_thread_info(find_thread(NULL), &ThreadInfo);
770	AssertReturn(status == B_OK, RTErrConvertFromErrno(status));
771
772	*pcMsKernelTime = ThreadInfo.kernel_time / 1000;
773	*pcMsUserTime = ThreadInfo.user_time / 1000;
774	return VINF_SUCCESS;
775
776	#else
777	RT_NOREF(pcMsKernelTime, pcMsUserTime);
778	return VERR_NOT_IMPLEMENTED;
779	#endif
780	}
781

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source: vbox/trunk/src/VBox/Runtime/r3/posix/thread-posix.cpp

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