semsrw-generic.cpp@ 4787

Last change on this file since 4787 was 4071, checked in by vboxsync, 17 years ago
Biggest check-in ever. New source code headers for all (C) innotek files.
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File size: 19.0 KB

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1	/* $Id: semsrw-generic.cpp 4071 2007-08-07 17:07:59Z vboxsync $ */
2	/** @file
3	* innotek Portable Runtime - Read-Write Semaphore, Generic.
4	*
5	* This is a generic implementation for OSes which don't have
6	* native RW semaphores.
7	*/
8
9	/*
10	* Copyright (C) 2006-2007 innotek GmbH
11	*
12	* This file is part of VirtualBox Open Source Edition (OSE), as
13	* available from http://www.virtualbox.org. This file is free software;
14	* you can redistribute it and/or modify it under the terms of the GNU
15	* General Public License as published by the Free Software Foundation,
16	* in version 2 as it comes in the "COPYING" file of the VirtualBox OSE
17	* distribution. VirtualBox OSE is distributed in the hope that it will
18	* be useful, but WITHOUT ANY WARRANTY of any kind.
19	*/
20
21	/** @todo fix generic RW sems. (reimplement) */
22	#define USE_CRIT_SECT
23
24
25	/*******************************************************************************
26	* Header Files *
27	*******************************************************************************/
28	#include <iprt/semaphore.h>
29	#include <iprt/alloc.h>
30	#include <iprt/time.h>
31	#include <iprt/asm.h>
32	#include <iprt/assert.h>
33	#include <iprt/thread.h>
34	#include <iprt/err.h>
35	#ifdef USE_CRIT_SECT
36	#include <iprt/critsect.h>
37	#endif
38
39
40
41	/*******************************************************************************
42	* Structures and Typedefs *
43	*******************************************************************************/
44	/** Internal representation of a Read-Write semaphore for the
45	* Generic implementation. */
46	struct RTSEMRWINTERNAL
47	{
48	#ifdef USE_CRIT_SECT
49	/** Critical section. */
50	RTCRITSECT CritSect;
51	#else
52	/** Magic (RTSEMRW_MAGIC). */
53	uint32_t u32Magic;
54	/** This critical section serializes the access to and updating of the structure members. */
55	RTCRITSECT CritSect;
56	/** The current number of readers. */
57	uint32_t cReaders;
58	/** The number of readers waiting. */
59	uint32_t cReadersWaiting;
60	/** The current number of waiting writers. */
61	uint32_t cWritersWaiting;
62	/** The handle of the event object on which the waiting readers block. (manual reset). */
63	RTSEMEVENTMULTI EventReaders;
64	/** The handle of the event object on which the waiting writers block. (manual reset). */
65	RTSEMEVENTMULTI EventWriters;
66	/** The current state of the read-write lock. */
67	KPRF_TYPE(,RWLOCKSTATE) enmState;
68
69	#endif
70	};
71
72
73	/**
74	* Validate a read-write semaphore handle passed to one of the interface.
75	*
76	* @returns true if valid.
77	* @returns false if invalid.
78	* @param pIntRWSem Pointer to the read-write semaphore to validate.
79	*/
80	inline bool rtsemRWValid(struct RTSEMRWINTERNAL *pIntRWSem)
81	{
82	if (!VALID_PTR(pIntRWSem))
83	return false;
84
85	#ifdef USE_CRIT_SECT
86	if (pIntRWSem->CritSect.u32Magic != RTCRITSECT_MAGIC)
87	return false;
88	#else
89	if (pIntRWSem->u32Check != (uint32_t)~0)
90	return false;
91	#endif
92	return true;
93	}
94
95
96	RTDECL(int) RTSemRWCreate(PRTSEMRW pRWSem)
97	{
98	int rc;
99
100	/*
101	* Allocate memory.
102	*/
103	struct RTSEMRWINTERNAL pIntRWSem = (struct RTSEMRWINTERNAL )RTMemAlloc(sizeof(struct RTSEMRWINTERNAL));
104	if (pIntRWSem)
105	{
106	#ifdef USE_CRIT_SECT
107	rc = RTCritSectInit(&pIntRWSem->CritSect);
108	if (RT_SUCCESS(rc))
109	{
110	*pRWSem = pIntRWSem;
111	return VINF_SUCCESS;
112	}
113	#else
114	/*
115	* Create the semaphores.
116	*/
117	rc = RTSemEventCreate(&pIntRWSem->WriteEvent);
118	if (RT_SUCCESS(rc))
119	{
120	rc = RTSemEventMultiCreate(&pIntRWSem->ReadEvent);
121	if (RT_SUCCESS(rc))
122	{
123	rc = RTSemMutexCreate(&pIntRWSem->Mutex);
124	if (RT_SUCCESS(rc))
125	{
126	/*
127	* Signal the read semaphore and initialize other variables.
128	*/
129	rc = RTSemEventMultiSignal(pIntRWSem->ReadEvent);
130	if (RT_SUCCESS(rc))
131	{
132	pIntRWSem->cReaders = 0;
133	pIntRWSem->cWriters = 0;
134	pIntRWSem->WROwner = NIL_RTTHREAD;
135	pIntRWSem->u32Check = ~0;
136	*pRWSem = pIntRWSem;
137	return VINF_SUCCESS;
138	}
139	RTSemMutexDestroy(pIntRWSem->Mutex);
140	}
141	RTSemEventMultiDestroy(pIntRWSem->ReadEvent);
142	}
143	RTSemEventDestroy(pIntRWSem->WriteEvent);
144	}
145	#endif
146	RTMemFree(pIntRWSem);
147	}
148	else
149	rc = VERR_NO_MEMORY;
150
151	return rc;
152	}
153
154
155	RTDECL(int) RTSemRWDestroy(RTSEMRW RWSem)
156	{
157	/*
158	* Validate handle.
159	*/
160	if (!rtsemRWValid(RWSem))
161	{
162	AssertMsgFailed(("Invalid handle %p!\n", RWSem));
163	return VERR_INVALID_HANDLE;
164	}
165
166	#ifdef USE_CRIT_SECT
167	struct RTSEMRWINTERNAL *pIntRWSem = RWSem;
168	int rc = RTCritSectDelete(&pIntRWSem->CritSect);
169	if (RT_SUCCESS(rc))
170	RTMemFree(pIntRWSem);
171	return rc;
172	#else
173
174	/*
175	* Check if busy.
176	*/
177	struct RTSEMRWINTERNAL *pIntRWSem = RWSem;
178	int rc = RTSemMutexRequest(pIntRWSem->Mutex, 32);
179	if (RT_SUCCESS(rc))
180	{
181	if (!pIntRWSem->cReaders && !pIntRWSem->cWriters)
182	{
183	/*
184	* Make it invalid and unusable.
185	*/
186	ASMAtomicXchgU32(&pIntRWSem->u32Check, 0);
187	ASMAtomicXchgU32(&pIntRWSem->cReaders, ~0);
188
189	/*
190	* Do actual cleanup.
191	* None of these can now fail excep for the mutex which
192	* can be a little bit busy.
193	*/
194	rc = RTSemEventMultiDestroy(pIntRWSem->ReadEvent);
195	AssertMsg(RT_SUCCESS(rc), ("RTSemEventMultiDestroy failed! rc=%d\n", rc)); NOREF(rc);
196	pIntRWSem->ReadEvent = NIL_RTSEMEVENTMULTI;
197
198	rc = RTSemEventDestroy(pIntRWSem->WriteEvent);
199	AssertMsg(RT_SUCCESS(rc), ("RTSemEventDestroy failed! rc=%d\n", rc)); NOREF(rc);
200	pIntRWSem->WriteEvent = NIL_RTSEMEVENT;
201
202	RTSemMutexRelease(pIntRWSem->Mutex);
203	for (unsigned i = 32; i > 0; i--)
204	{
205	rc = RTSemMutexDestroy(pIntRWSem->Mutex);
206	if (RT_SUCCESS(rc))
207	break;
208	RTThreadSleep(1);
209	}
210	AssertMsg(RT_SUCCESS(rc), ("RTSemMutexDestroy failed! rc=%d\n", rc)); NOREF(rc);
211	pIntRWSem->Mutex = (RTSEMMUTEX)0;
212
213	RTMemFree(pIntRWSem);
214	rc = VINF_SUCCESS;
215	}
216	else
217	{
218	rc = VERR_SEM_BUSY;
219	RTSemMutexRelease(pIntRWSem->Mutex);
220	}
221	}
222	else
223	rc = rc == VERR_TIMEOUT ? VERR_SEM_BUSY : rc;
224
225	return VINF_SUCCESS;
226	#endif
227	}
228
229
230	RTDECL(int) RTSemRWRequestRead(RTSEMRW RWSem, unsigned cMillies)
231	{
232	/*
233	* Validate handle.
234	*/
235	if (!rtsemRWValid(RWSem))
236	{
237	AssertMsgFailed(("Invalid handle %p!\n", RWSem));
238	return VERR_INVALID_HANDLE;
239	}
240
241	#ifdef USE_CRIT_SECT
242	struct RTSEMRWINTERNAL *pIntRWSem = RWSem;
243	return RTCritSectEnter(&pIntRWSem->CritSect);
244	#else
245
246	/*
247	* Take mutex and check if already reader.
248	*/
249	//RTTHREAD Self = RTThreadSelf();
250	RTTHREAD Self = (RTTHREAD)RTThreadNativeSelf();
251	unsigned cMilliesInitial = cMillies;
252	uint64_t tsStart = 0;
253	if (cMillies != RTSEM_INDEFINITE_WAIT)
254	tsStart = RTTimeNanoTS();
255
256	struct RTSEMRWINTERNAL *pIntRWSem = RWSem;
257	int rc = RTSemMutexRequest(pIntRWSem->Mutex, RTSEM_INDEFINITE_WAIT);
258	if (RT_FAILURE(rc))
259	{
260	AssertMsgFailed(("RTSemMutexRequest failed on rwsem %p, rc=%d\n", RWSem, rc));
261	return rc;
262	}
263
264	unsigned i = pIntRWSem->cReaders;
265	while (i-- > 0)
266	{
267	if (pIntRWSem->aReaders[i].Thread == Self)
268	{
269	if (pIntRWSem->aReaders[i].cNesting + 1 < (unsigned)~0)
270	pIntRWSem->aReaders[i].cNesting++;
271	else
272	{
273	AssertMsgFailed(("Too many requests for one thread!\n"));
274	rc = RTSemMutexRelease(pIntRWSem->Mutex);
275	AssertMsg(RT_SUCCESS(rc), ("RTSemMutexRelease failed rc=%d\n", rc));
276	return VERR_TOO_MANY_SEM_REQUESTS;
277	}
278	}
279	}
280
281
282	for (;;)
283	{
284	/*
285	* Check if the stat of the affairs allow read access.
286	*/
287	if (pIntRWSem->u32Check == (uint32_t)~0)
288	{
289	if (pIntRWSem->cWriters == 0)
290	{
291	if (pIntRWSem->cReaders < ELEMENTS(pIntRWSem->aReaders))
292	{
293	/*
294	* Add ourselves to the list of readers and return.
295	*/
296	i = pIntRWSem->cReaders;
297	pIntRWSem->aReaders[i].Thread = Self;
298	pIntRWSem->aReaders[i].cNesting = 1;
299	ASMAtomicXchgU32(&pIntRWSem->cReaders, i + 1);
300
301	RTSemMutexRelease(pIntRWSem->Mutex);
302	return VINF_SUCCESS;
303	}
304	else
305	{
306	AssertMsgFailed(("Too many readers! How come we have so many threads!?!\n"));
307	rc = VERR_TOO_MANY_SEM_REQUESTS;
308	}
309	}
310	#if 0 /* any action here shouldn't be necessary */
311	else
312	{
313	rc = RTSemEventMultiReset(pIntRWSem->ReadEvent);
314	AssertMsg(RT_SUCCESS(rc), ("RTSemEventMultiReset failed on RWSem %p, rc=%d\n", RWSem, rc));
315	}
316	#endif
317	}
318	else
319	rc = VERR_SEM_DESTROYED;
320	RTSemMutexRelease(pIntRWSem->Mutex);
321	if (RT_FAILURE(rc))
322	break;
323
324
325	/*
326	* Wait till it's ready for reading.
327	*/
328	if (cMillies != RTSEM_INDEFINITE_WAIT)
329	{
330	int64_t tsDelta = RTTimeNanoTS() - tsStart;
331	if (tsDelta >= 1000000)
332	{
333	cMillies = cMilliesInitial - (unsigned)(tsDelta / 1000000);
334	if (cMillies > cMilliesInitial)
335	cMillies = cMilliesInitial ? 1 : 0;
336	}
337	}
338	rc = RTSemEventMultiWait(pIntRWSem->ReadEvent, cMillies);
339	if (RT_FAILURE(rc))
340	{
341	AssertMsg(rc == VERR_TIMEOUT, ("RTSemEventMultiWait failed on rwsem %p, rc=%d\n", RWSem, rc));
342	break;
343	}
344
345	/*
346	* Get Mutex.
347	*/
348	rc = RTSemMutexRequest(pIntRWSem->Mutex, RTSEM_INDEFINITE_WAIT);
349	if (RT_FAILURE(rc))
350	{
351	AssertMsgFailed(("RTSemMutexRequest failed on rwsem %p, rc=%d\n", RWSem, rc));
352	break;
353	}
354	}
355
356	return rc;
357	#endif
358	}
359
360
361	RTDECL(int) RTSemRWRequestReadNoResume(RTSEMRW RWSem, unsigned cMillies)
362	{
363	return RTSemRWRequestRead(RWSem, cMillies);
364	}
365
366
367	RTDECL(int) RTSemRWReleaseRead(RTSEMRW RWSem)
368	{
369	/*
370	* Validate handle.
371	*/
372	if (!rtsemRWValid(RWSem))
373	{
374	AssertMsgFailed(("Invalid handle %p!\n", RWSem));
375	return VERR_INVALID_HANDLE;
376	}
377
378	#ifdef USE_CRIT_SECT
379	struct RTSEMRWINTERNAL *pIntRWSem = RWSem;
380	return RTCritSectLeave(&pIntRWSem->CritSect);
381	#else
382
383	/*
384	* Take Mutex.
385	*/
386	//RTTHREAD Self = RTThreadSelf();
387	RTTHREAD Self = (RTTHREAD)RTThreadNativeSelf();
388	struct RTSEMRWINTERNAL *pIntRWSem = RWSem;
389	int rc = RTSemMutexRequest(pIntRWSem->Mutex, RTSEM_INDEFINITE_WAIT);
390	if (RT_SUCCESS(rc))
391	{
392	unsigned i = pIntRWSem->cReaders;
393	while (i-- > 0)
394	{
395	if (pIntRWSem->aReaders[i].Thread == Self)
396	{
397	AssertMsg(pIntRWSem->WROwner == NIL_RTTHREAD, ("Impossible! Writers and Readers are exclusive!\n"));
398
399	if (pIntRWSem->aReaders[i].cNesting <= 1)
400	{
401	pIntRWSem->aReaders[i] = pIntRWSem->aReaders[pIntRWSem->cReaders - 1];
402	ASMAtomicXchgU32(&pIntRWSem->cReaders, pIntRWSem->cReaders - 1);
403
404	/* Kick off writers? */
405	if ( pIntRWSem->cWriters > 0
406	&& pIntRWSem->cReaders == 0)
407	{
408	rc = RTSemEventSignal(pIntRWSem->WriteEvent);
409	AssertMsg(RT_SUCCESS(rc), ("Failed to signal writers on rwsem %p, rc=%d\n", RWSem, rc));
410	}
411	}
412	else
413	pIntRWSem->aReaders[i].cNesting--;
414
415	RTSemMutexRelease(pIntRWSem->Mutex);
416	return VINF_SUCCESS;
417	}
418	}
419
420	RTSemMutexRelease(pIntRWSem->Mutex);
421	rc = VERR_NOT_OWNER;
422	AssertMsgFailed(("Not reader of rwsem %p\n", RWSem));
423	}
424	else
425	AssertMsgFailed(("RTSemMutexRequest failed on rwsem %p, rc=%d\n", RWSem, rc));
426
427	return rc;
428	#endif
429	}
430
431
432
433	RTDECL(int) RTSemRWRequestWrite(RTSEMRW RWSem, unsigned cMillies)
434	{
435	/*
436	* Validate handle.
437	*/
438	if (!rtsemRWValid(RWSem))
439	{
440	AssertMsgFailed(("Invalid handle %p!\n", RWSem));
441	return VERR_INVALID_HANDLE;
442	}
443
444	#ifdef USE_CRIT_SECT
445	struct RTSEMRWINTERNAL *pIntRWSem = RWSem;
446	return RTCritSectEnter(&pIntRWSem->CritSect);
447	#else
448
449	/*
450	* Get Mutex.
451	*/
452	//RTTHREAD Self = RTThreadSelf();
453	RTTHREAD Self = (RTTHREAD)RTThreadNativeSelf();
454	unsigned cMilliesInitial = cMillies;
455	uint64_t tsStart = 0;
456	if (cMillies != RTSEM_INDEFINITE_WAIT)
457	tsStart = RTTimeNanoTS();
458
459	struct RTSEMRWINTERNAL *pIntRWSem = RWSem;
460	int rc = RTSemMutexRequest(pIntRWSem->Mutex, RTSEM_INDEFINITE_WAIT);
461	if (RT_FAILURE(rc))
462	{
463	AssertMsgFailed(("RTSemMutexWait failed on rwsem %p, rc=%d\n", RWSem, rc));
464	return rc;
465	}
466
467	/*
468	* Check that we're not a reader.
469	*/
470	unsigned i = pIntRWSem->cReaders;
471	while (i-- > 0)
472	{
473	if (pIntRWSem->aReaders[i].Thread == Self)
474	{
475	AssertMsgFailed(("Deadlock - requested write access while being a reader! rwsem %p.\n", RWSem));
476	RTSemMutexRelease(pIntRWSem->Mutex);
477	return VERR_DEADLOCK;
478	}
479	}
480
481
482	/*
483	* Reset the reader event semaphore and increment number of readers.
484	*/
485	rc = RTSemEventMultiReset(pIntRWSem->ReadEvent);
486	if (RT_FAILURE(rc))
487	{
488	AssertMsgFailed(("Failed to reset readers, rwsem %p, rc=%d.\n", RWSem, rc));
489	RTSemMutexRelease(pIntRWSem->Mutex);
490	return rc;
491	}
492	ASMAtomicXchgU32(&pIntRWSem->cWriters, pIntRWSem->cWriters + 1);
493
494	/*
495	* Wait while there are other threads owning this sem.
496	*/
497	while ( pIntRWSem->WROwner != NIL_RTTHREAD
498	\|\| pIntRWSem->cReaders > 0)
499	{
500	AssertMsg(pIntRWSem->WROwner == NIL_RTTHREAD \|\| pIntRWSem->cWriters > 1,
501	("The lock is write owned by there is only one waiter...\n"));
502
503	/*
504	* Release the mutex and wait on the writer semaphore.
505	*/
506	rc = RTSemMutexRelease(pIntRWSem->Mutex);
507	if (RT_FAILURE(rc))
508	{
509	AssertMsgFailed(("RTSemMutexRelease failed on rwsem %p, rc=%d\n", RWSem, rc));
510	return VERR_SEM_DESTROYED;
511	}
512
513	/*
514	* Wait.
515	*/
516	if (cMillies != RTSEM_INDEFINITE_WAIT)
517	{
518	int64_t tsDelta = RTTimeNanoTS() - tsStart;
519	if (tsDelta >= 1000000)
520	{
521	cMillies = cMilliesInitial - (unsigned)(tsDelta / 1000000);
522	if (cMillies > cMilliesInitial)
523	cMillies = cMilliesInitial ? 1 : 0;
524	}
525	}
526	rc = RTSemEventWait(pIntRWSem->WriteEvent, cMillies);
527
528	/*
529	* Check that the semaphore wasn't destroyed while we waited.
530	*/
531	if ( rc == VERR_SEM_DESTROYED
532	\|\| pIntRWSem->u32Check != (uint32_t)~0)
533	return VERR_SEM_DESTROYED;
534
535	/*
536	* Attempt take the mutex.
537	*/
538	int rc2 = RTSemMutexRequest(pIntRWSem->Mutex, RTSEM_INDEFINITE_WAIT);
539	if (RT_FAILURE(rc) \|\| RT_FAILURE(rc2))
540	{
541	AssertMsg(RT_SUCCESS(rc2), ("RTSemMutexRequest failed on rwsem %p, rc=%d\n", RWSem, rc2));
542	if (RT_SUCCESS(rc))
543	rc = rc2;
544	else
545	AssertMsg(rc == VERR_TIMEOUT, ("RTSemEventWait failed on rwsem %p, rc=%d\n", RWSem, rc));
546
547	/*
548	* Remove our selves from the writers queue.
549	*/
550	/** @todo write an atomic dec function! (it's too late for that kind of stuff tonight) */
551	if (pIntRWSem->cWriters > 0)
552	ASMAtomicXchgU32(&pIntRWSem->cWriters, pIntRWSem->cWriters - 1);
553	if (!pIntRWSem->cWriters)
554	RTSemEventMultiSignal(pIntRWSem->ReadEvent);
555	if (RT_SUCCESS(rc2))
556	RTSemMutexRelease(pIntRWSem->Mutex);
557	return rc;
558	}
559
560	AssertMsg(pIntRWSem->WROwner == NIL_RTTHREAD, ("We woke up an there is owner! %#x\n", pIntRWSem->WROwner));
561	AssertMsg(!pIntRWSem->cReaders, ("We woke up an there are readers around!\n"));
562	}
563
564	/*
565	* If we get here we own the mutex and we are ready to take
566	* the read-write ownership.
567	*/
568	ASMAtomicXchgPtr((void * volatile )&pIntRWSem->WROwner, (void )Self);
569	rc = RTSemMutexRelease(pIntRWSem->Mutex);
570	AssertMsg(RT_SUCCESS(rc), ("RTSemMutexRelease failed. rc=%d\n", rc)); NOREF(rc);
571
572	return VINF_SUCCESS;
573	#endif
574	}
575
576
577	RTDECL(int) RTSemRWRequestWriteNoResume(RTSEMRW RWSem, unsigned cMillies)
578	{
579	return RTSemRWRequestWrite(RWSem, cMillies);
580	}
581
582
583
584	RTDECL(int) RTSemRWReleaseWrite(RTSEMRW RWSem)
585	{
586	/*
587	* Validate handle.
588	*/
589	if (!rtsemRWValid(RWSem))
590	{
591	AssertMsgFailed(("Invalid handle %p!\n", RWSem));
592	return VERR_INVALID_HANDLE;
593	}
594
595	#ifdef USE_CRIT_SECT
596	struct RTSEMRWINTERNAL *pIntRWSem = RWSem;
597	return RTCritSectLeave(&pIntRWSem->CritSect);
598	#else
599
600	/*
601	* Check if owner.
602	*/
603	//RTTHREAD Self = RTThreadSelf();
604	RTTHREAD Self = (RTTHREAD)RTThreadNativeSelf();
605	struct RTSEMRWINTERNAL *pIntRWSem = RWSem;
606	if (pIntRWSem->WROwner != Self)
607	{
608	AssertMsgFailed(("Not read-write owner of rwsem %p.\n", RWSem));
609	return VERR_NOT_OWNER;
610	}
611
612	/*
613	* Request the mutex.
614	*/
615	int rc = RTSemMutexRequest(pIntRWSem->Mutex, RTSEM_INDEFINITE_WAIT);
616	if (RT_FAILURE(rc))
617	{
618	AssertMsgFailed(("RTSemMutexWait failed on rwsem %p, rc=%d\n", RWSem, rc));
619	return rc;
620	}
621
622	/*
623	* Release ownership and remove ourselves from the writers count.
624	*/
625	ASMAtomicXchgPtr((void * volatile )&pIntRWSem->WROwner, (void )NIL_RTTHREAD);
626	Assert(pIntRWSem->cWriters > 0);
627	ASMAtomicXchgU32(&pIntRWSem->cWriters, pIntRWSem->cWriters - 1);
628
629	/*
630	* Release the readers if no more writers.
631	*/
632	if (!pIntRWSem->cWriters)
633	{
634	rc = RTSemEventMultiSignal(pIntRWSem->ReadEvent);
635	AssertMsg(RT_SUCCESS(rc), ("RTSemEventMultiSignal failed for rwsem %p, rc=%d.\n", RWSem, rc)); NOREF(rc);
636	}
637	rc = RTSemMutexRelease(pIntRWSem->Mutex);
638	AssertMsg(RT_SUCCESS(rc), ("RTSemEventMultiSignal failed for rwsem %p, rc=%d.\n", RWSem, rc)); NOREF(rc);
639
640	return VINF_SUCCESS;
641	#endif
642	}
643

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source: vbox/trunk/src/VBox/Runtime/generic/semsrw-generic.cpp@ 4787

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