reqpool.cpp@ 80204

Last change on this file since 80204 was 77257, checked in by vboxsync, 6 years ago
Runtime/RTReqPool: Memory leak fixes during destruction
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1	/* $Id: reqpool.cpp 77257 2019-02-11 12:50:00Z vboxsync $ */
2	/** @file
3	* IPRT - Request Pool.
4	*/
5
6	/*
7	* Copyright (C) 2006-2019 Oracle Corporation
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 (GPL) as published by the Free Software
13	* Foundation, in version 2 as it comes in the "COPYING" file of the
14	* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
15	* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
16	*
17	* The contents of this file may alternatively be used under the terms
18	* of the Common Development and Distribution License Version 1.0
19	* (CDDL) only, as it comes in the "COPYING.CDDL" file of the
20	* VirtualBox OSE distribution, in which case the provisions of the
21	* CDDL are applicable instead of those of the GPL.
22	*
23	* You may elect to license modified versions of this file under the
24	* terms and conditions of either the GPL or the CDDL or both.
25	*/
26
27
28	/*********************************************************************************************************************************
29	* Header Files *
30	*********************************************************************************************************************************/
31	#include <iprt/req.h>
32	#include "internal/iprt.h"
33
34	#include <iprt/assert.h>
35	#include <iprt/asm.h>
36	#include <iprt/critsect.h>
37	#include <iprt/err.h>
38	#include <iprt/list.h>
39	#include <iprt/log.h>
40	#include <iprt/mem.h>
41	#include <iprt/string.h>
42	#include <iprt/time.h>
43	#include <iprt/semaphore.h>
44	#include <iprt/thread.h>
45
46	#include "internal/req.h"
47	#include "internal/magics.h"
48
49
50	/*********************************************************************************************************************************
51	* Defined Constants And Macros *
52	*********************************************************************************************************************************/
53	/** The max number of worker threads. */
54	#define RTREQPOOL_MAX_THREADS UINT32_C(16384)
55	/** The max number of milliseconds to push back. */
56	#define RTREQPOOL_PUSH_BACK_MAX_MS RT_MS_1MIN
57	/** The max number of free requests to keep around. */
58	#define RTREQPOOL_MAX_FREE_REQUESTS (RTREQPOOL_MAX_THREADS * 2U)
59
60
61	/*********************************************************************************************************************************
62	* Structures and Typedefs *
63	*********************************************************************************************************************************/
64	typedef struct RTREQPOOLTHREAD
65	{
66	/** Node in the RTREQPOOLINT::IdleThreads list. */
67	RTLISTNODE IdleNode;
68	/** Node in the RTREQPOOLINT::WorkerThreads list. */
69	RTLISTNODE ListNode;
70
71	/** The submit timestamp of the pending request. */
72	uint64_t uPendingNanoTs;
73	/** The submit timestamp of the request processing. */
74	uint64_t uProcessingNanoTs;
75	/** When this CPU went idle the last time. */
76	uint64_t uIdleNanoTs;
77	/** The number of requests processed by this thread. */
78	uint64_t cReqProcessed;
79	/** Total time the requests processed by this thread took to process. */
80	uint64_t cNsTotalReqProcessing;
81	/** Total time the requests processed by this thread had to wait in
82	* the queue before being scheduled. */
83	uint64_t cNsTotalReqQueued;
84	/** The CPU this was scheduled last time we checked. */
85	RTCPUID idLastCpu;
86
87	/** The submitter will put an incoming request here when scheduling an idle
88	* thread. */
89	PRTREQINT volatile pTodoReq;
90	/** The request the thread is currently processing. */
91	PRTREQINT volatile pPendingReq;
92
93	/** The thread handle. */
94	RTTHREAD hThread;
95	/** Nano seconds timestamp representing the birth time of the thread. */
96	uint64_t uBirthNanoTs;
97	/** Pointer to the request thread pool instance the thread is associated
98	* with. */
99	struct RTREQPOOLINT *pPool;
100	} RTREQPOOLTHREAD;
101	/** Pointer to a worker thread. */
102	typedef RTREQPOOLTHREAD *PRTREQPOOLTHREAD;
103
104	/**
105	* Request thread pool instance data.
106	*/
107	typedef struct RTREQPOOLINT
108	{
109	/** Magic value (RTREQPOOL_MAGIC). */
110	uint32_t u32Magic;
111	/** The request pool name. */
112	char szName[12];
113
114	/** @name Config
115	* @{ */
116	/** The worker thread type. */
117	RTTHREADTYPE enmThreadType;
118	/** The maximum number of worker threads. */
119	uint32_t cMaxThreads;
120	/** The minimum number of worker threads. */
121	uint32_t cMinThreads;
122	/** The number of milliseconds a thread needs to be idle before it is
123	* considered for retirement. */
124	uint32_t cMsMinIdle;
125	/** cMsMinIdle in nano seconds. */
126	uint64_t cNsMinIdle;
127	/** The idle thread sleep interval in milliseconds. */
128	RTMSINTERVAL cMsIdleSleep;
129	/** The number of threads which should be spawned before throttling kicks
130	* in. */
131	uint32_t cThreadsPushBackThreshold;
132	/** The max number of milliseconds to push back a submitter before creating
133	* a new worker thread once the threshold has been reached. */
134	uint32_t cMsMaxPushBack;
135	/** The minimum number of milliseconds to push back a submitter before
136	* creating a new worker thread once the threshold has been reached. */
137	uint32_t cMsMinPushBack;
138	/** The max number of free requests in the recycle LIFO. */
139	uint32_t cMaxFreeRequests;
140	/** @} */
141
142	/** Signaled by terminating worker threads. */
143	RTSEMEVENTMULTI hThreadTermEvt;
144
145	/** Destruction indicator. The worker threads checks in their loop. */
146	bool volatile fDestructing;
147
148	/** The current submitter push back in milliseconds.
149	* This is recalculated when worker threads come and go. */
150	uint32_t cMsCurPushBack;
151	/** The current number of worker threads. */
152	uint32_t cCurThreads;
153	/** Statistics: The total number of threads created. */
154	uint32_t cThreadsCreated;
155	/** Statistics: The timestamp when the last thread was created. */
156	uint64_t uLastThreadCreateNanoTs;
157	/** Linked list of worker threads. */
158	RTLISTANCHOR WorkerThreads;
159
160	/** The number of requests processed and counted in the time totals. */
161	uint64_t cReqProcessed;
162	/** Total time the requests processed by this thread took to process. */
163	uint64_t cNsTotalReqProcessing;
164	/** Total time the requests processed by this thread had to wait in
165	* the queue before being scheduled. */
166	uint64_t cNsTotalReqQueued;
167
168	/** Reference counter. */
169	uint32_t volatile cRefs;
170	/** The number of idle thread or threads in the process of becoming
171	* idle. This is increased before the to-be-idle thread tries to enter
172	* the critical section and add itself to the list. */
173	uint32_t volatile cIdleThreads;
174	/** Linked list of idle threads. */
175	RTLISTANCHOR IdleThreads;
176
177	/** Head of the request FIFO. */
178	PRTREQINT pPendingRequests;
179	/** Where to insert the next request. */
180	PRTREQINT *ppPendingRequests;
181	/** The number of requests currently pending. */
182	uint32_t cCurPendingRequests;
183	/** The number of requests currently being executed. */
184	uint32_t volatile cCurActiveRequests;
185	/** The number of requests submitted. */
186	uint64_t cReqSubmitted;
187
188	/** Head of the request recycling LIFO. */
189	PRTREQINT pFreeRequests;
190	/** The number of requests in the recycling LIFO. This is read without
191	* entering the critical section, thus volatile. */
192	uint32_t volatile cCurFreeRequests;
193
194	/** Critical section serializing access to members of this structure. */
195	RTCRITSECT CritSect;
196
197	} RTREQPOOLINT;
198
199
200	/**
201	* Used by exiting thread and the pool destruction code to cancel unexpected
202	* requests.
203	*
204	* @param pReq The request.
205	*/
206	static void rtReqPoolCancelReq(PRTREQINT pReq)
207	{
208	pReq->uOwner.hPool = NIL_RTREQPOOL; /* force free */
209	pReq->enmState = RTREQSTATE_COMPLETED;
210	ASMAtomicWriteS32(&pReq->iStatusX, VERR_CANCELLED);
211	if (pReq->hPushBackEvt != NIL_RTSEMEVENTMULTI)
212	RTSemEventMultiSignal(pReq->hPushBackEvt);
213	RTSemEventSignal(pReq->EventSem);
214
215	RTReqRelease(pReq);
216	}
217
218
219	/**
220	* Recalculate the max pushback interval when adding or removing worker threads.
221	*
222	* @param pPool The pool. cMsCurPushBack will be changed.
223	*/
224	static void rtReqPoolRecalcPushBack(PRTREQPOOLINT pPool)
225	{
226	uint32_t const cMsRange = pPool->cMsMaxPushBack - pPool->cMsMinPushBack;
227	uint32_t const cSteps = pPool->cMaxThreads - pPool->cThreadsPushBackThreshold;
228	uint32_t const iStep = pPool->cCurThreads - pPool->cThreadsPushBackThreshold;
229
230	uint32_t cMsCurPushBack;
231	if ((cMsRange >> 2) >= cSteps)
232	cMsCurPushBack = cMsRange / cSteps * iStep;
233	else
234	cMsCurPushBack = (uint32_t)( (uint64_t)cMsRange * RT_NS_1MS / cSteps * iStep / RT_NS_1MS );
235	cMsCurPushBack += pPool->cMsMinPushBack;
236
237	pPool->cMsCurPushBack = cMsCurPushBack;
238	}
239
240
241
242	/**
243	* Performs thread exit.
244	*
245	* @returns Thread termination status code (VINF_SUCCESS).
246	* @param pPool The pool.
247	* @param pThread The thread.
248	* @param fLocked Whether we are inside the critical section
249	* already.
250	*/
251	static int rtReqPoolThreadExit(PRTREQPOOLINT pPool, PRTREQPOOLTHREAD pThread, bool fLocked)
252	{
253	if (!fLocked)
254	RTCritSectEnter(&pPool->CritSect);
255
256	/* Get out of the idle list. */
257	if (!RTListIsEmpty(&pThread->IdleNode))
258	{
259	RTListNodeRemove(&pThread->IdleNode);
260	Assert(pPool->cIdleThreads > 0);
261	ASMAtomicDecU32(&pPool->cIdleThreads);
262	}
263
264	/* Get out of the thread list. */
265	RTListNodeRemove(&pThread->ListNode);
266	Assert(pPool->cCurThreads > 0);
267	pPool->cCurThreads--;
268	rtReqPoolRecalcPushBack(pPool);
269
270	/* This shouldn't happen... */
271	PRTREQINT pReq = pThread->pTodoReq;
272	if (pReq)
273	{
274	AssertFailed();
275	pThread->pTodoReq = NULL;
276	rtReqPoolCancelReq(pReq);
277	}
278
279	/* If we're the last thread terminating, ping the destruction thread before
280	we leave the critical section. */
281	if ( RTListIsEmpty(&pPool->WorkerThreads)
282	&& pPool->hThreadTermEvt != NIL_RTSEMEVENT)
283	RTSemEventMultiSignal(pPool->hThreadTermEvt);
284
285	RTCritSectLeave(&pPool->CritSect);
286
287	RTMemFree(pThread);
288	return VINF_SUCCESS;
289	}
290
291
292
293	/**
294	* Process one request.
295	*
296	* @param pPool The pool.
297	* @param pThread The worker thread.
298	* @param pReq The request to process.
299	*/
300	static void rtReqPoolThreadProcessRequest(PRTREQPOOLINT pPool, PRTREQPOOLTHREAD pThread, PRTREQINT pReq)
301	{
302	/*
303	* Update thread state.
304	*/
305	pThread->uProcessingNanoTs = RTTimeNanoTS();
306	pThread->uPendingNanoTs = pReq->uSubmitNanoTs;
307	pThread->pPendingReq = pReq;
308	ASMAtomicIncU32(&pPool->cCurActiveRequests);
309	Assert(pReq->u32Magic == RTREQ_MAGIC);
310
311	/*
312	* Do the actual processing.
313	*/
314	rtReqProcessOne(pReq);
315
316	/*
317	* Update thread statistics and state.
318	*/
319	ASMAtomicDecU32(&pPool->cCurActiveRequests);
320	pThread->pPendingReq = NULL;
321	uint64_t const uNsTsEnd = RTTimeNanoTS();
322	pThread->cNsTotalReqProcessing += uNsTsEnd - pThread->uProcessingNanoTs;
323	pThread->cNsTotalReqQueued += pThread->uProcessingNanoTs - pThread->uPendingNanoTs;
324	pThread->cReqProcessed++;
325	}
326
327
328
329	/**
330	* The Worker Thread Procedure.
331	*
332	* @returns VINF_SUCCESS.
333	* @param hThreadSelf The thread handle (unused).
334	* @param pvArg Pointer to the thread data.
335	*/
336	static DECLCALLBACK(int) rtReqPoolThreadProc(RTTHREAD hThreadSelf, void *pvArg)
337	{
338	PRTREQPOOLTHREAD pThread = (PRTREQPOOLTHREAD)pvArg;
339	PRTREQPOOLINT pPool = pThread->pPool;
340
341	/*
342	* The work loop.
343	*/
344	uint64_t cReqPrevProcessedIdle = UINT64_MAX;
345	uint64_t cReqPrevProcessedStat = 0;
346	uint64_t cNsPrevTotalReqProcessing = 0;
347	uint64_t cNsPrevTotalReqQueued = 0;
348	while (!pPool->fDestructing)
349	{
350	/*
351	* Process pending work.
352	*/
353
354	/* Check if anything is scheduled directly to us. */
355	PRTREQINT pReq = ASMAtomicXchgPtrT(&pThread->pTodoReq, NULL, PRTREQINT);
356	if (pReq)
357	{
358	Assert(RTListIsEmpty(&pThread->IdleNode)); /* Must not be in the idle list. */
359	rtReqPoolThreadProcessRequest(pPool, pThread, pReq);
360	continue;
361	}
362
363	ASMAtomicIncU32(&pPool->cIdleThreads);
364	RTCritSectEnter(&pPool->CritSect);
365
366	/* Update the global statistics. */
367	if (cReqPrevProcessedStat != pThread->cReqProcessed)
368	{
369	pPool->cReqProcessed += pThread->cReqProcessed - cReqPrevProcessedStat;
370	cReqPrevProcessedStat = pThread->cReqProcessed;
371	pPool->cNsTotalReqProcessing += pThread->cNsTotalReqProcessing - cNsPrevTotalReqProcessing;
372	cNsPrevTotalReqProcessing = pThread->cNsTotalReqProcessing;
373	pPool->cNsTotalReqQueued += pThread->cNsTotalReqQueued - cNsPrevTotalReqQueued;
374	cNsPrevTotalReqQueued = pThread->cNsTotalReqQueued;
375	}
376
377	/* Recheck the todo request pointer after entering the critsect. */
378	pReq = ASMAtomicXchgPtrT(&pThread->pTodoReq, NULL, PRTREQINT);
379	if (pReq)
380	{
381	Assert(RTListIsEmpty(&pThread->IdleNode)); /* Must not be in the idle list. */
382	RTCritSectLeave(&pPool->CritSect);
383
384	rtReqPoolThreadProcessRequest(pPool, pThread, pReq);
385	continue;
386	}
387
388	/* Any pending requests in the queue? */
389	pReq = pPool->pPendingRequests;
390	if (pReq)
391	{
392	pPool->pPendingRequests = pReq->pNext;
393	if (pReq->pNext == NULL)
394	pPool->ppPendingRequests = &pPool->pPendingRequests;
395	Assert(pPool->cCurPendingRequests > 0);
396	pPool->cCurPendingRequests--;
397
398	/* Un-idle ourselves and process the request. */
399	if (!RTListIsEmpty(&pThread->IdleNode))
400	{
401	RTListNodeRemove(&pThread->IdleNode);
402	RTListInit(&pThread->IdleNode);
403	ASMAtomicDecU32(&pPool->cIdleThreads);
404	}
405	ASMAtomicDecU32(&pPool->cIdleThreads);
406	RTCritSectLeave(&pPool->CritSect);
407
408	rtReqPoolThreadProcessRequest(pPool, pThread, pReq);
409	continue;
410	}
411
412	/*
413	* Nothing to do, go idle.
414	*/
415	if (cReqPrevProcessedIdle != pThread->cReqProcessed)
416	{
417	cReqPrevProcessedIdle = pThread->cReqProcessed;
418	pThread->uIdleNanoTs = RTTimeNanoTS();
419	}
420	else if (pPool->cCurThreads > pPool->cMinThreads)
421	{
422	uint64_t cNsIdle = RTTimeNanoTS() - pThread->uIdleNanoTs;
423	if (cNsIdle >= pPool->cNsMinIdle)
424	return rtReqPoolThreadExit(pPool, pThread, true /fLocked/);
425	}
426
427	if (RTListIsEmpty(&pThread->IdleNode))
428	RTListPrepend(&pPool->IdleThreads, &pThread->IdleNode);
429	else
430	ASMAtomicDecU32(&pPool->cIdleThreads);
431	RTThreadUserReset(hThreadSelf);
432	uint32_t const cMsSleep = pPool->cMsIdleSleep;
433
434	RTCritSectLeave(&pPool->CritSect);
435
436	RTThreadUserWait(hThreadSelf, cMsSleep);
437	}
438
439	return rtReqPoolThreadExit(pPool, pThread, false /fLocked/);
440	}
441
442
443	/**
444	* Create a new worker thread.
445	*
446	* @param pPool The pool needing new worker thread.
447	* @remarks Caller owns the critical section
448	*/
449	static void rtReqPoolCreateNewWorker(RTREQPOOL pPool)
450	{
451	PRTREQPOOLTHREAD pThread = (PRTREQPOOLTHREAD)RTMemAllocZ(sizeof(RTREQPOOLTHREAD));
452	if (!pThread)
453	return;
454
455	pThread->uBirthNanoTs = RTTimeNanoTS();
456	pThread->pPool = pPool;
457	pThread->idLastCpu = NIL_RTCPUID;
458	pThread->hThread = NIL_RTTHREAD;
459	RTListInit(&pThread->IdleNode);
460	RTListAppend(&pPool->WorkerThreads, &pThread->ListNode);
461	pPool->cCurThreads++;
462	pPool->cThreadsCreated++;
463
464	int rc = RTThreadCreateF(&pThread->hThread, rtReqPoolThreadProc, pThread, 0 /default stack size/,
465	pPool->enmThreadType, 0 /fFlags/, "%s%02u", pPool->szName, pPool->cThreadsCreated);
466	if (RT_SUCCESS(rc))
467	pPool->uLastThreadCreateNanoTs = pThread->uBirthNanoTs;
468	else
469	{
470	pPool->cCurThreads--;
471	RTListNodeRemove(&pThread->ListNode);
472	RTMemFree(pThread);
473	}
474	}
475
476
477	/**
478	* Repel the submitter, giving the worker threads a chance to process the
479	* incoming request.
480	*
481	* @returns Success if a worker picked up the request, failure if not. The
482	* critical section has been left on success, while we'll be inside it
483	* on failure.
484	* @param pPool The pool.
485	* @param pReq The incoming request.
486	*/
487	static int rtReqPoolPushBack(PRTREQPOOLINT pPool, PRTREQINT pReq)
488	{
489	/*
490	* Lazily create the push back semaphore that we'll be blociing on.
491	*/
492	int rc;
493	RTSEMEVENTMULTI hEvt = pReq->hPushBackEvt;
494	if (hEvt == NIL_RTSEMEVENTMULTI)
495	{
496	rc = RTSemEventMultiCreate(&hEvt);
497	if (RT_FAILURE(rc))
498	return rc;
499	pReq->hPushBackEvt = hEvt;
500	}
501
502	/*
503	* Prepare the request and semaphore.
504	*/
505	uint32_t const cMsTimeout = pPool->cMsCurPushBack;
506	pReq->fSignalPushBack = true;
507	RTReqRetain(pReq);
508	RTSemEventMultiReset(hEvt);
509
510	RTCritSectLeave(&pPool->CritSect);
511
512	/*
513	* Block.
514	*/
515	rc = RTSemEventMultiWait(hEvt, cMsTimeout);
516	if (RT_FAILURE(rc))
517	{
518	AssertMsg(rc == VERR_TIMEOUT, ("%Rrc\n", rc));
519	RTCritSectEnter(&pPool->CritSect);
520	}
521	RTReqRelease(pReq);
522	return rc;
523	}
524
525
526
527	DECLHIDDEN(void) rtReqPoolSubmit(PRTREQPOOLINT pPool, PRTREQINT pReq)
528	{
529	RTCritSectEnter(&pPool->CritSect);
530
531	pPool->cReqSubmitted++;
532
533	/*
534	* Try schedule the request to a thread that's currently idle.
535	*/
536	PRTREQPOOLTHREAD pThread = RTListGetFirst(&pPool->IdleThreads, RTREQPOOLTHREAD, IdleNode);
537	if (pThread)
538	{
539	/** @todo CPU affinity??? */
540	ASMAtomicWritePtr(&pThread->pTodoReq, pReq);
541
542	RTListNodeRemove(&pThread->IdleNode);
543	RTListInit(&pThread->IdleNode);
544	ASMAtomicDecU32(&pPool->cIdleThreads);
545
546	RTThreadUserSignal(pThread->hThread);
547
548	RTCritSectLeave(&pPool->CritSect);
549	return;
550	}
551	Assert(RTListIsEmpty(&pPool->IdleThreads));
552
553	/*
554	* Put the request in the pending queue.
555	*/
556	pReq->pNext = NULL;
557	*pPool->ppPendingRequests = pReq;
558	pPool->ppPendingRequests = (PRTREQINT*)&pReq->pNext;
559	pPool->cCurPendingRequests++;
560
561	/*
562	* If there is an incoming worker thread already or we've reached the
563	* maximum number of worker threads, we're done.
564	*/
565	if ( pPool->cIdleThreads > 0
566	\|\| pPool->cCurThreads >= pPool->cMaxThreads)
567	{
568	RTCritSectLeave(&pPool->CritSect);
569	return;
570	}
571
572	/*
573	* Push back before creating a new worker thread.
574	*/
575	if ( pPool->cCurThreads > pPool->cThreadsPushBackThreshold
576	&& (RTTimeNanoTS() - pReq->uSubmitNanoTs) / RT_NS_1MS >= pPool->cMsCurPushBack )
577	{
578	int rc = rtReqPoolPushBack(pPool, pReq);
579	if (RT_SUCCESS(rc))
580	return;
581	}
582
583	/*
584	* Create a new thread for processing the request.
585	* For simplicity, we don't bother leaving the critical section while doing so.
586	*/
587	rtReqPoolCreateNewWorker(pPool);
588
589	RTCritSectLeave(&pPool->CritSect);
590	return;
591	}
592
593
594	/**
595	* Frees a requst.
596	*
597	* @returns true if recycled, false if not.
598	* @param pPool The request thread pool.
599	* @param pReq The request.
600	*/
601	DECLHIDDEN(bool) rtReqPoolRecycle(PRTREQPOOLINT pPool, PRTREQINT pReq)
602	{
603	if ( pPool
604	&& ASMAtomicReadU32(&pPool->cCurFreeRequests) < pPool->cMaxFreeRequests)
605	{
606	RTCritSectEnter(&pPool->CritSect);
607	if (pPool->cCurFreeRequests < pPool->cMaxFreeRequests)
608	{
609	pReq->pNext = pPool->pFreeRequests;
610	pPool->pFreeRequests = pReq;
611	ASMAtomicIncU32(&pPool->cCurFreeRequests);
612
613	RTCritSectLeave(&pPool->CritSect);
614	return true;
615	}
616
617	RTCritSectLeave(&pPool->CritSect);
618	}
619	return false;
620	}
621
622
623	RTDECL(int) RTReqPoolCreate(uint32_t cMaxThreads, RTMSINTERVAL cMsMinIdle,
624	uint32_t cThreadsPushBackThreshold, uint32_t cMsMaxPushBack,
625	const char *pszName, PRTREQPOOL phPool)
626	{
627	/*
628	* Validate and massage the config.
629	*/
630	if (cMaxThreads == UINT32_MAX)
631	cMaxThreads = RTREQPOOL_MAX_THREADS;
632	AssertMsgReturn(cMaxThreads > 0 && cMaxThreads <= RTREQPOOL_MAX_THREADS, ("%u\n", cMaxThreads), VERR_OUT_OF_RANGE);
633	uint32_t const cMinThreads = cMaxThreads > 2 ? 2 : cMaxThreads - 1;
634
635	if (cThreadsPushBackThreshold == 0)
636	cThreadsPushBackThreshold = cMinThreads;
637	else if (cThreadsPushBackThreshold == UINT32_MAX)
638	cThreadsPushBackThreshold = cMaxThreads;
639	AssertMsgReturn(cThreadsPushBackThreshold <= cMaxThreads, ("%u/%u\n", cThreadsPushBackThreshold, cMaxThreads), VERR_OUT_OF_RANGE);
640
641	if (cMsMaxPushBack == UINT32_MAX)
642	cMsMaxPushBack = RTREQPOOL_PUSH_BACK_MAX_MS;
643	AssertMsgReturn(cMsMaxPushBack <= RTREQPOOL_PUSH_BACK_MAX_MS, ("%llu\n", cMsMaxPushBack), VERR_OUT_OF_RANGE);
644	uint32_t const cMsMinPushBack = cMsMaxPushBack >= 200 ? 100 : cMsMaxPushBack / 2;
645
646	AssertPtrReturn(pszName, VERR_INVALID_POINTER);
647	size_t cchName = strlen(pszName);
648	AssertReturn(cchName > 0, VERR_INVALID_PARAMETER);
649	Assert(cchName <= 10);
650
651	AssertPtrReturn(phPool, VERR_INVALID_POINTER);
652
653	/*
654	* Create and initialize the pool.
655	*/
656	PRTREQPOOLINT pPool = (PRTREQPOOLINT)RTMemAlloc(sizeof(*pPool));
657	if (!pPool)
658	return VERR_NO_MEMORY;
659
660	pPool->u32Magic = RTREQPOOL_MAGIC;
661	RTStrCopy(pPool->szName, sizeof(pPool->szName), pszName);
662
663	pPool->enmThreadType = RTTHREADTYPE_DEFAULT;
664	pPool->cMaxThreads = cMaxThreads;
665	pPool->cMinThreads = cMinThreads;
666	pPool->cMsMinIdle = cMsMinIdle == RT_INDEFINITE_WAIT \|\| cMsMinIdle >= UINT32_MAX ? UINT32_MAX : cMsMinIdle;
667	pPool->cNsMinIdle = pPool->cMsMinIdle == UINT32_MAX ? UINT64_MAX : cMsMinIdle * RT_NS_1MS_64;
668	pPool->cMsIdleSleep = pPool->cMsMinIdle == UINT32_MAX ? RT_INDEFINITE_WAIT : RT_MAX(RT_MS_1SEC, pPool->cMsMinIdle);
669	pPool->cThreadsPushBackThreshold = cThreadsPushBackThreshold;
670	pPool->cMsMaxPushBack = cMsMaxPushBack;
671	pPool->cMsMinPushBack = cMsMinPushBack;
672	pPool->cMaxFreeRequests = cMaxThreads * 2;
673	pPool->hThreadTermEvt = NIL_RTSEMEVENTMULTI;
674	pPool->fDestructing = false;
675	pPool->cMsCurPushBack = 0;
676	pPool->cCurThreads = 0;
677	pPool->cThreadsCreated = 0;
678	pPool->uLastThreadCreateNanoTs = 0;
679	RTListInit(&pPool->WorkerThreads);
680	pPool->cReqProcessed = 0;
681	pPool->cNsTotalReqProcessing= 0;
682	pPool->cNsTotalReqQueued = 0;
683	pPool->cRefs = 1;
684	pPool->cIdleThreads = 0;
685	RTListInit(&pPool->IdleThreads);
686	pPool->pPendingRequests = NULL;
687	pPool->ppPendingRequests = &pPool->pPendingRequests;
688	pPool->cCurPendingRequests = 0;
689	pPool->cCurActiveRequests = 0;
690	pPool->cReqSubmitted = 0;
691	pPool->pFreeRequests = NULL;
692	pPool->cCurFreeRequests = 0;
693
694	int rc = RTSemEventMultiCreate(&pPool->hThreadTermEvt);
695	if (RT_SUCCESS(rc))
696	{
697	rc = RTCritSectInit(&pPool->CritSect);
698	if (RT_SUCCESS(rc))
699	{
700	*phPool = pPool;
701	return VINF_SUCCESS;
702	}
703
704	RTSemEventMultiDestroy(pPool->hThreadTermEvt);
705	}
706	pPool->u32Magic = RTREQPOOL_MAGIC_DEAD;
707	RTMemFree(pPool);
708	return rc;
709	}
710
711
712
713	RTDECL(int) RTReqPoolSetCfgVar(RTREQPOOL hPool, RTREQPOOLCFGVAR enmVar, uint64_t uValue)
714	{
715	PRTREQPOOLINT pPool = hPool;
716	AssertPtrReturn(pPool, VERR_INVALID_HANDLE);
717	AssertReturn(pPool->u32Magic == RTREQPOOL_MAGIC, VERR_INVALID_HANDLE);
718	AssertReturn(enmVar > RTREQPOOLCFGVAR_INVALID && enmVar < RTREQPOOLCFGVAR_END, VERR_INVALID_PARAMETER);
719
720	RTCritSectEnter(&pPool->CritSect);
721
722	bool fWakeUpIdleThreads = false;
723	int rc = VINF_SUCCESS;
724	switch (enmVar)
725	{
726	case RTREQPOOLCFGVAR_THREAD_TYPE:
727	AssertMsgBreakStmt(uValue > (uint64_t)RTTHREADTYPE_INVALID && uValue < (uint64_t)RTTHREADTYPE_END,
728	("%llu\n", uValue), rc = VERR_OUT_OF_RANGE);
729
730	pPool->enmThreadType = (RTTHREADTYPE)uValue;
731	break;
732
733	case RTREQPOOLCFGVAR_MIN_THREADS:
734	AssertMsgBreakStmt(uValue <= RTREQPOOL_MAX_THREADS, ("%llu\n", uValue), rc = VERR_OUT_OF_RANGE);
735	fWakeUpIdleThreads = pPool->cMinThreads > (uint32_t)uValue;
736	pPool->cMinThreads = (uint32_t)uValue;
737	if (pPool->cMinThreads > pPool->cMaxThreads)
738	pPool->cMaxThreads = pPool->cMinThreads;
739	if ( pPool->cThreadsPushBackThreshold < pPool->cMinThreads
740	\|\| pPool->cThreadsPushBackThreshold > pPool->cMaxThreads)
741	pPool->cThreadsPushBackThreshold = pPool->cMinThreads + (pPool->cMaxThreads - pPool->cMinThreads) / 2;
742	rtReqPoolRecalcPushBack(pPool);
743	break;
744
745	case RTREQPOOLCFGVAR_MAX_THREADS:
746	AssertMsgBreakStmt(uValue <= RTREQPOOL_MAX_THREADS && uValue >= 1, ("%llu\n", uValue), rc = VERR_OUT_OF_RANGE);
747	pPool->cMaxThreads = (uint32_t)uValue;
748	if (pPool->cMaxThreads < pPool->cMinThreads)
749	{
750	pPool->cMinThreads = pPool->cMaxThreads;
751	fWakeUpIdleThreads = true;
752	}
753	if (pPool->cMaxThreads < pPool->cThreadsPushBackThreshold)
754	pPool->cThreadsPushBackThreshold = pPool->cMinThreads + (pPool->cMaxThreads - pPool->cMinThreads) / 2;
755	rtReqPoolRecalcPushBack(pPool);
756	break;
757
758	case RTREQPOOLCFGVAR_MS_MIN_IDLE:
759	AssertMsgBreakStmt(uValue < UINT32_MAX \|\| uValue == RT_INDEFINITE_WAIT, ("%llu\n", uValue), rc = VERR_OUT_OF_RANGE);
760	if (uValue < UINT32_MAX && uValue != RT_INDEFINITE_WAIT)
761	{
762	fWakeUpIdleThreads = pPool->cMsMinIdle != (uint32_t)uValue;
763	pPool->cMsMinIdle = (uint32_t)uValue;
764	pPool->cNsMinIdle = pPool->cMsMinIdle * RT_NS_1MS_64;
765	if (pPool->cMsIdleSleep > pPool->cMsMinIdle)
766	pPool->cMsIdleSleep = RT_MAX(RT_MS_1SEC, pPool->cMsMinIdle);
767	}
768	else
769	{
770	pPool->cMsMinIdle = UINT32_MAX;
771	pPool->cNsMinIdle = UINT64_MAX;
772	pPool->cMsIdleSleep = RT_INDEFINITE_WAIT;
773	}
774	break;
775
776	case RTREQPOOLCFGVAR_MS_IDLE_SLEEP:
777	AssertMsgBreakStmt(uValue <= RT_INDEFINITE_WAIT, ("%llu\n", uValue), rc = VERR_OUT_OF_RANGE);
778	fWakeUpIdleThreads = pPool->cMsMinIdle > (RTMSINTERVAL)uValue;
779	pPool->cMsIdleSleep = (RTMSINTERVAL)uValue;
780	if (pPool->cMsIdleSleep == RT_INDEFINITE_WAIT)
781	{
782	pPool->cMsMinIdle = UINT32_MAX;
783	pPool->cNsMinIdle = UINT64_MAX;
784	}
785	break;
786
787	case RTREQPOOLCFGVAR_PUSH_BACK_THRESHOLD:
788	if (uValue == UINT64_MAX)
789	pPool->cThreadsPushBackThreshold = pPool->cMaxThreads;
790	else if (uValue == 0)
791	pPool->cThreadsPushBackThreshold = pPool->cMinThreads;
792	else
793	{
794	AssertMsgBreakStmt(uValue <= pPool->cMaxThreads, ("%llu\n", uValue), rc = VERR_OUT_OF_RANGE);
795	AssertMsgBreakStmt(uValue >= pPool->cMinThreads, ("%llu\n", uValue), rc = VERR_OUT_OF_RANGE);
796	pPool->cThreadsPushBackThreshold = (uint32_t)uValue;
797	}
798	break;
799
800	case RTREQPOOLCFGVAR_PUSH_BACK_MIN_MS:
801	if (uValue == UINT32_MAX \|\| uValue == UINT64_MAX)
802	uValue = RTREQPOOL_PUSH_BACK_MAX_MS;
803	else
804	AssertMsgBreakStmt(uValue <= RTREQPOOL_PUSH_BACK_MAX_MS, ("%llu\n", uValue), rc = VERR_OUT_OF_RANGE);
805	pPool->cMsMinPushBack = (uint32_t)uValue;
806	if (pPool->cMsMaxPushBack < pPool->cMsMinPushBack)
807	pPool->cMsMaxPushBack = pPool->cMsMinPushBack;
808	rtReqPoolRecalcPushBack(pPool);
809	break;
810
811	case RTREQPOOLCFGVAR_PUSH_BACK_MAX_MS:
812	if (uValue == UINT32_MAX \|\| uValue == UINT64_MAX)
813	uValue = RTREQPOOL_PUSH_BACK_MAX_MS;
814	else
815	AssertMsgBreakStmt(uValue <= RTREQPOOL_PUSH_BACK_MAX_MS, ("%llu\n", uValue), rc = VERR_OUT_OF_RANGE);
816	pPool->cMsMaxPushBack = (uint32_t)uValue;
817	if (pPool->cMsMinPushBack < pPool->cMsMaxPushBack)
818	pPool->cMsMinPushBack = pPool->cMsMaxPushBack;
819	rtReqPoolRecalcPushBack(pPool);
820	break;
821
822	case RTREQPOOLCFGVAR_MAX_FREE_REQUESTS:
823	if (uValue == UINT64_MAX)
824	{
825	pPool->cMaxFreeRequests = pPool->cMaxThreads * 2;
826	if (pPool->cMaxFreeRequests < 16)
827	pPool->cMaxFreeRequests = 16;
828	}
829	else
830	{
831	AssertMsgBreakStmt(uValue <= RTREQPOOL_MAX_FREE_REQUESTS, ("%llu\n", uValue), rc = VERR_OUT_OF_RANGE);
832	pPool->cMaxFreeRequests = (uint32_t)uValue;
833	}
834
835	while (pPool->cCurFreeRequests > pPool->cMaxFreeRequests)
836	{
837	PRTREQINT pReq = pPool->pFreeRequests;
838	pPool->pFreeRequests = pReq->pNext;
839	ASMAtomicDecU32(&pPool->cCurFreeRequests);
840	rtReqFreeIt(pReq);
841	}
842	break;
843
844	default:
845	AssertFailed();
846	rc = VERR_IPE_NOT_REACHED_DEFAULT_CASE;
847	}
848
849	/* Wake up all idle threads if required. */
850	if (fWakeUpIdleThreads)
851	{
852	Assert(rc == VINF_SUCCESS);
853	PRTREQPOOLTHREAD pThread;
854	RTListForEach(&pPool->WorkerThreads, pThread, RTREQPOOLTHREAD, ListNode)
855	{
856	RTThreadUserSignal(pThread->hThread);
857	}
858	}
859
860	RTCritSectLeave(&pPool->CritSect);
861
862	return rc;
863	}
864	RT_EXPORT_SYMBOL(RTReqPoolSetCfgVar);
865
866
867	RTDECL(uint64_t) RTReqPoolGetCfgVar(RTREQPOOL hPool, RTREQPOOLCFGVAR enmVar)
868	{
869	PRTREQPOOLINT pPool = hPool;
870	AssertPtrReturn(pPool, UINT64_MAX);
871	AssertReturn(pPool->u32Magic == RTREQPOOL_MAGIC, UINT64_MAX);
872	AssertReturn(enmVar > RTREQPOOLCFGVAR_INVALID && enmVar < RTREQPOOLCFGVAR_END, UINT64_MAX);
873
874	RTCritSectEnter(&pPool->CritSect);
875
876	uint64_t u64;
877	switch (enmVar)
878	{
879	case RTREQPOOLCFGVAR_THREAD_TYPE:
880	u64 = pPool->enmThreadType;
881	break;
882
883	case RTREQPOOLCFGVAR_MIN_THREADS:
884	u64 = pPool->cMinThreads;
885	break;
886
887	case RTREQPOOLCFGVAR_MAX_THREADS:
888	u64 = pPool->cMaxThreads;
889	break;
890
891	case RTREQPOOLCFGVAR_MS_MIN_IDLE:
892	u64 = pPool->cMsMinIdle;
893	break;
894
895	case RTREQPOOLCFGVAR_MS_IDLE_SLEEP:
896	u64 = pPool->cMsIdleSleep;
897	break;
898
899	case RTREQPOOLCFGVAR_PUSH_BACK_THRESHOLD:
900	u64 = pPool->cThreadsPushBackThreshold;
901	break;
902
903	case RTREQPOOLCFGVAR_PUSH_BACK_MIN_MS:
904	u64 = pPool->cMsMinPushBack;
905	break;
906
907	case RTREQPOOLCFGVAR_PUSH_BACK_MAX_MS:
908	u64 = pPool->cMsMaxPushBack;
909	break;
910
911	case RTREQPOOLCFGVAR_MAX_FREE_REQUESTS:
912	u64 = pPool->cMaxFreeRequests;
913	break;
914
915	default:
916	AssertFailed();
917	u64 = UINT64_MAX;
918	break;
919	}
920
921	RTCritSectLeave(&pPool->CritSect);
922
923	return u64;
924	}
925	RT_EXPORT_SYMBOL(RTReqGetQueryCfgVar);
926
927
928	RTDECL(uint64_t) RTReqPoolGetStat(RTREQPOOL hPool, RTREQPOOLSTAT enmStat)
929	{
930	PRTREQPOOLINT pPool = hPool;
931	AssertPtrReturn(pPool, UINT64_MAX);
932	AssertReturn(pPool->u32Magic == RTREQPOOL_MAGIC, UINT64_MAX);
933	AssertReturn(enmStat > RTREQPOOLSTAT_INVALID && enmStat < RTREQPOOLSTAT_END, UINT64_MAX);
934
935	RTCritSectEnter(&pPool->CritSect);
936
937	uint64_t u64;
938	switch (enmStat)
939	{
940	case RTREQPOOLSTAT_THREADS: u64 = pPool->cCurThreads; break;
941	case RTREQPOOLSTAT_THREADS_CREATED: u64 = pPool->cThreadsCreated; break;
942	case RTREQPOOLSTAT_REQUESTS_PROCESSED: u64 = pPool->cReqProcessed; break;
943	case RTREQPOOLSTAT_REQUESTS_SUBMITTED: u64 = pPool->cReqSubmitted; break;
944	case RTREQPOOLSTAT_REQUESTS_PENDING: u64 = pPool->cCurPendingRequests; break;
945	case RTREQPOOLSTAT_REQUESTS_ACTIVE: u64 = pPool->cCurActiveRequests; break;
946	case RTREQPOOLSTAT_REQUESTS_FREE: u64 = pPool->cCurFreeRequests; break;
947	case RTREQPOOLSTAT_NS_TOTAL_REQ_PROCESSING: u64 = pPool->cNsTotalReqProcessing; break;
948	case RTREQPOOLSTAT_NS_TOTAL_REQ_QUEUED: u64 = pPool->cNsTotalReqQueued; break;
949	case RTREQPOOLSTAT_NS_AVERAGE_REQ_PROCESSING: u64 = pPool->cNsTotalReqProcessing / RT_MAX(pPool->cReqProcessed, 1); break;
950	case RTREQPOOLSTAT_NS_AVERAGE_REQ_QUEUED: u64 = pPool->cNsTotalReqQueued / RT_MAX(pPool->cReqProcessed, 1); break;
951	default:
952	AssertFailed();
953	u64 = UINT64_MAX;
954	break;
955	}
956
957	RTCritSectLeave(&pPool->CritSect);
958
959	return u64;
960	}
961	RT_EXPORT_SYMBOL(RTReqPoolGetStat);
962
963
964	RTDECL(uint32_t) RTReqPoolRetain(RTREQPOOL hPool)
965	{
966	PRTREQPOOLINT pPool = hPool;
967	AssertPtrReturn(pPool, UINT32_MAX);
968	AssertReturn(pPool->u32Magic == RTREQPOOL_MAGIC, UINT32_MAX);
969
970	return ASMAtomicIncU32(&pPool->cRefs);
971	}
972	RT_EXPORT_SYMBOL(RTReqPoolRetain);
973
974
975	RTDECL(uint32_t) RTReqPoolRelease(RTREQPOOL hPool)
976	{
977	/*
978	* Ignore NULL and validate the request.
979	*/
980	if (!hPool)
981	return 0;
982	PRTREQPOOLINT pPool = hPool;
983	AssertPtrReturn(pPool, UINT32_MAX);
984	AssertReturn(pPool->u32Magic == RTREQPOOL_MAGIC, UINT32_MAX);
985
986	/*
987	* Drop a reference, free it when it reaches zero.
988	*/
989	uint32_t cRefs = ASMAtomicDecU32(&pPool->cRefs);
990	if (cRefs == 0)
991	{
992	AssertReturn(ASMAtomicCmpXchgU32(&pPool->u32Magic, RTREQPOOL_MAGIC_DEAD, RTREQPOOL_MAGIC), UINT32_MAX);
993
994	RTCritSectEnter(&pPool->CritSect);
995	#ifdef RT_STRICT
996	RTTHREAD const hSelf = RTThreadSelf();
997	#endif
998
999	/* Indicate to the worker threads that we're shutting down. */
1000	ASMAtomicWriteBool(&pPool->fDestructing, true);
1001	PRTREQPOOLTHREAD pThread;
1002	RTListForEach(&pPool->WorkerThreads, pThread, RTREQPOOLTHREAD, ListNode)
1003	{
1004	Assert(pThread->hThread != hSelf);
1005	RTThreadUserSignal(pThread->hThread);
1006	}
1007
1008	/* Cancel pending requests. */
1009	Assert(!pPool->pPendingRequests);
1010	while (pPool->pPendingRequests)
1011	{
1012	PRTREQINT pReq = pPool->pPendingRequests;
1013	pPool->pPendingRequests = pReq->pNext;
1014	rtReqPoolCancelReq(pReq);
1015	}
1016	pPool->ppPendingRequests = NULL;
1017	pPool->cCurPendingRequests = 0;
1018
1019	/* Wait for the workers to shut down. */
1020	while (!RTListIsEmpty(&pPool->WorkerThreads))
1021	{
1022	RTCritSectLeave(&pPool->CritSect);
1023	RTSemEventMultiWait(pPool->hThreadTermEvt, RT_MS_1MIN);
1024	RTCritSectEnter(&pPool->CritSect);
1025	/** @todo should we wait forever here? */
1026	}
1027
1028	/* Free recycled requests. */
1029	for (;;)
1030	{
1031	PRTREQINT pReq = pPool->pFreeRequests;
1032	if (!pReq)
1033	break;
1034	pPool->pFreeRequests = pReq->pNext;
1035	pPool->cCurFreeRequests--;
1036	rtReqFreeIt(pReq);
1037	}
1038
1039	/* Finally, free the critical section and pool instance. */
1040	RTSemEventMultiDestroy(pPool->hThreadTermEvt);
1041	RTCritSectLeave(&pPool->CritSect);
1042	RTCritSectDelete(&pPool->CritSect);
1043	RTMemFree(pPool);
1044	}
1045
1046	return cRefs;
1047	}
1048	RT_EXPORT_SYMBOL(RTReqPoolRelease);
1049
1050
1051	RTDECL(int) RTReqPoolAlloc(RTREQPOOL hPool, RTREQTYPE enmType, PRTREQ *phReq)
1052	{
1053	PRTREQPOOLINT pPool = hPool;
1054	AssertPtrReturn(pPool, VERR_INVALID_HANDLE);
1055	AssertReturn(pPool->u32Magic == RTREQPOOL_MAGIC, VERR_INVALID_HANDLE);
1056
1057	/*
1058	* Try recycle old requests.
1059	*/
1060	if (ASMAtomicReadU32(&pPool->cCurFreeRequests) > 0)
1061	{
1062	RTCritSectEnter(&pPool->CritSect);
1063	PRTREQINT pReq = pPool->pFreeRequests;
1064	if (pReq)
1065	{
1066	ASMAtomicDecU32(&pPool->cCurFreeRequests);
1067	pPool->pFreeRequests = pReq->pNext;
1068
1069	RTCritSectLeave(&pPool->CritSect);
1070
1071	Assert(pReq->fPoolOrQueue);
1072	Assert(pReq->uOwner.hPool == pPool);
1073
1074	int rc = rtReqReInit(pReq, enmType);
1075	if (RT_SUCCESS(rc))
1076	{
1077	*phReq = pReq;
1078	LogFlow(("RTReqPoolAlloc: returns VINF_SUCCESS *phReq=%p recycled\n", pReq));
1079	return rc;
1080	}
1081	}
1082	else
1083	RTCritSectLeave(&pPool->CritSect);
1084	}
1085
1086	/*
1087	* Allocate a new request.
1088	*/
1089	int rc = rtReqAlloc(enmType, true /fPoolOrQueue/, pPool, phReq);
1090	LogFlow(("RTReqPoolAlloc: returns %Rrc phReq=%p\n", rc, phReq));
1091	return rc;
1092	}
1093	RT_EXPORT_SYMBOL(RTReqPoolAlloc);
1094
1095
1096	RTDECL(int) RTReqPoolCallEx( RTREQPOOL hPool, RTMSINTERVAL cMillies, PRTREQ *phReq, uint32_t fFlags, PFNRT pfnFunction, unsigned cArgs, ...)
1097	{
1098	va_list va;
1099	va_start(va, cArgs);
1100	int rc = RTReqPoolCallExV(hPool, cMillies, phReq, fFlags, pfnFunction, cArgs, va);
1101	va_end(va);
1102	return rc;
1103	}
1104	RT_EXPORT_SYMBOL(RTReqPoolCallEx);
1105
1106
1107	RTDECL(int) RTReqPoolCallExV(RTREQPOOL hPool, RTMSINTERVAL cMillies, PRTREQ *phReq, uint32_t fFlags, PFNRT pfnFunction, unsigned cArgs, va_list va)
1108	{
1109	/*
1110	* Check input.
1111	*/
1112	AssertPtrReturn(pfnFunction, VERR_INVALID_POINTER);
1113	AssertMsgReturn(!((uint32_t)fFlags & ~(uint32_t)(RTREQFLAGS_NO_WAIT \| RTREQFLAGS_RETURN_MASK)), ("%#x\n", (uint32_t)fFlags), VERR_INVALID_PARAMETER);
1114	if (!(fFlags & RTREQFLAGS_NO_WAIT))
1115	{
1116	AssertPtrReturn(phReq, VERR_INVALID_POINTER);
1117	*phReq = NIL_RTREQ;
1118	}
1119
1120	PRTREQINT pReq = NULL;
1121	AssertMsgReturn(cArgs * sizeof(uintptr_t) <= sizeof(pReq->u.Internal.aArgs), ("cArgs=%u\n", cArgs), VERR_TOO_MUCH_DATA);
1122
1123	/*
1124	* Allocate and initialize the request.
1125	*/
1126	int rc = RTReqPoolAlloc(hPool, RTREQTYPE_INTERNAL, &pReq);
1127	if (RT_FAILURE(rc))
1128	return rc;
1129	pReq->fFlags = fFlags;
1130	pReq->u.Internal.pfn = pfnFunction;
1131	pReq->u.Internal.cArgs = cArgs;
1132	for (unsigned iArg = 0; iArg < cArgs; iArg++)
1133	pReq->u.Internal.aArgs[iArg] = va_arg(va, uintptr_t);
1134
1135	/*
1136	* Submit the request.
1137	*/
1138	rc = RTReqSubmit(pReq, cMillies);
1139	if ( rc != VINF_SUCCESS
1140	&& rc != VERR_TIMEOUT)
1141	{
1142	Assert(rc != VERR_INTERRUPTED);
1143	RTReqRelease(pReq);
1144	pReq = NULL;
1145	}
1146
1147	if (!(fFlags & RTREQFLAGS_NO_WAIT))
1148	{
1149	*phReq = pReq;
1150	LogFlow(("RTReqPoolCallExV: returns %Rrc *phReq=%p\n", rc, pReq));
1151	}
1152	else
1153	LogFlow(("RTReqPoolCallExV: returns %Rrc\n", rc));
1154	return rc;
1155	}
1156	RT_EXPORT_SYMBOL(RTReqPoolCallExV);
1157
1158
1159	RTDECL(int) RTReqPoolCallWait(RTREQPOOL hPool, PFNRT pfnFunction, unsigned cArgs, ...)
1160	{
1161	PRTREQINT pReq;
1162	va_list va;
1163	va_start(va, cArgs);
1164	int rc = RTReqPoolCallExV(hPool, RT_INDEFINITE_WAIT, &pReq, RTREQFLAGS_IPRT_STATUS,
1165	pfnFunction, cArgs, va);
1166	va_end(va);
1167	if (RT_SUCCESS(rc))
1168	rc = pReq->iStatusX;
1169	RTReqRelease(pReq);
1170	return rc;
1171	}
1172	RT_EXPORT_SYMBOL(RTReqPoolCallWait);
1173
1174
1175	RTDECL(int) RTReqPoolCallNoWait(RTREQPOOL hPool, PFNRT pfnFunction, unsigned cArgs, ...)
1176	{
1177	va_list va;
1178	va_start(va, cArgs);
1179	int rc = RTReqPoolCallExV(hPool, 0, NULL, RTREQFLAGS_IPRT_STATUS \| RTREQFLAGS_NO_WAIT,
1180	pfnFunction, cArgs, va);
1181	va_end(va);
1182	return rc;
1183	}
1184	RT_EXPORT_SYMBOL(RTReqPoolCallNoWait);
1185
1186
1187	RTDECL(int) RTReqPoolCallVoidWait(RTREQPOOL hPool, PFNRT pfnFunction, unsigned cArgs, ...)
1188	{
1189	PRTREQINT pReq;
1190	va_list va;
1191	va_start(va, cArgs);
1192	int rc = RTReqPoolCallExV(hPool, RT_INDEFINITE_WAIT, &pReq, RTREQFLAGS_VOID,
1193	pfnFunction, cArgs, va);
1194	va_end(va);
1195	if (RT_SUCCESS(rc))
1196	rc = pReq->iStatusX;
1197	RTReqRelease(pReq);
1198	return rc;
1199	}
1200	RT_EXPORT_SYMBOL(RTReqPoolCallVoidWait);
1201
1202
1203	RTDECL(int) RTReqPoolCallVoidNoWait(RTREQPOOL hPool, PFNRT pfnFunction, unsigned cArgs, ...)
1204	{
1205	va_list va;
1206	va_start(va, cArgs);
1207	int rc = RTReqPoolCallExV(hPool, 0, NULL, RTREQFLAGS_VOID \| RTREQFLAGS_NO_WAIT,
1208	pfnFunction, cArgs, va);
1209	va_end(va);
1210	return rc;
1211	}
1212	RT_EXPORT_SYMBOL(RTReqPoolCallVoidNoWait);
1213

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source: vbox/trunk/src/VBox/Runtime/common/misc/reqpool.cpp@ 80204

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