req.h@ 53370

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1	/** @file
2	* IPRT - Request Queue & Pool.
3	*/
4
5	/*
6	* Copyright (C) 2006-2011 Oracle Corporation
7	*
8	* This file is part of VirtualBox Open Source Edition (OSE), as
9	* available from http://www.virtualbox.org. This file is free software;
10	* you can redistribute it and/or modify it under the terms of the GNU
11	* General Public License (GPL) as published by the Free Software
12	* Foundation, in version 2 as it comes in the "COPYING" file of the
13	* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
14	* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
15	*
16	* The contents of this file may alternatively be used under the terms
17	* of the Common Development and Distribution License Version 1.0
18	* (CDDL) only, as it comes in the "COPYING.CDDL" file of the
19	* VirtualBox OSE distribution, in which case the provisions of the
20	* CDDL are applicable instead of those of the GPL.
21	*
22	* You may elect to license modified versions of this file under the
23	* terms and conditions of either the GPL or the CDDL or both.
24	*/
25
26	#ifndef ___iprt_req_h
27	#define ___iprt_req_h
28
29	#include <iprt/cdefs.h>
30	#include <iprt/types.h>
31
32	#include <iprt/stdarg.h>
33
34	RT_C_DECLS_BEGIN
35
36	/** @defgroup grp_rt_req RTReq - Request Queue & Pool.
37	* @ingroup grp_rt
38	* @{
39	*/
40
41	/** Request queue handle. */
42	typedef struct RTREQQUEUEINT *RTREQQUEUE;
43	/** Pointer to a request queue handle. */
44	typedef RTREQQUEUE *PRTREQQUEUE;
45	/** NIL request queue handle. */
46	#define NIL_RTREQQUEUE ((RTREQQUEUE)0)
47
48	/** Request thread pool handle. */
49	typedef struct RTREQPOOLINT *RTREQPOOL;
50	/** Poiner to a request thread pool handle. */
51	typedef RTREQPOOL *PRTREQPOOL;
52	/** NIL request pool handle. */
53	#define NIL_RTREQPOOL ((RTREQPOOL)0)
54
55
56	/**
57	* Request type.
58	*/
59	typedef enum RTREQTYPE
60	{
61	/** Invalid request. */
62	RTREQTYPE_INVALID = 0,
63	/** RT: Internal. */
64	RTREQTYPE_INTERNAL,
65	/** Maximum request type (exclusive). Used for validation. */
66	RTREQTYPE_MAX
67	} RTREQTYPE;
68
69	/**
70	* Request flags.
71	*/
72	typedef enum RTREQFLAGS
73	{
74	/** The request returns a iprt status code. */
75	RTREQFLAGS_IPRT_STATUS = 0,
76	/** The request is a void request and have no status code. */
77	RTREQFLAGS_VOID = 1,
78	/** Return type mask. */
79	RTREQFLAGS_RETURN_MASK = 1,
80	/** Caller does not wait on the packet, Queue process thread will free it. */
81	RTREQFLAGS_NO_WAIT = 2
82	} RTREQFLAGS;
83
84
85	/** A request packet. */
86	typedef struct RTREQ RTREQ;
87	/** Pointer to an RT request packet. */
88	typedef RTREQ *PRTREQ;
89	/** Nil request handle. */
90	#define NIL_RTREQ ((PRTREQ)0)
91
92
93	#ifdef IN_RING3
94
95	/**
96	* Create a request packet queue
97	*
98	* @returns iprt status code.
99	* @param phQueue Where to store the request queue handle.
100	*/
101	RTDECL(int) RTReqQueueCreate(PRTREQQUEUE phQueue);
102
103	/**
104	* Destroy a request packet queue
105	*
106	* @returns iprt status code.
107	* @param hQueue The request queue.
108	*/
109	RTDECL(int) RTReqQueueDestroy(RTREQQUEUE hQueue);
110
111	/**
112	* Process one or more request packets
113	*
114	* @returns iprt status code.
115	* @returns VERR_TIMEOUT if cMillies was reached without the packet being added.
116	*
117	* @param hQueue The request queue.
118	* @param cMillies Number of milliseconds to wait for a pending request.
119	* Use RT_INDEFINITE_WAIT to only wait till one is added.
120	*/
121	RTDECL(int) RTReqQueueProcess(RTREQQUEUE hQueue, RTMSINTERVAL cMillies);
122
123	/**
124	* Allocate and queue a call request.
125	*
126	* If it's desired to poll on the completion of the request set cMillies
127	* to 0 and use RTReqWait() to check for completion. In the other case
128	* use RT_INDEFINITE_WAIT.
129	* The returned request packet must be freed using RTReqRelease().
130	*
131	* @returns iprt statuscode.
132	* Will not return VERR_INTERRUPTED.
133	* @returns VERR_TIMEOUT if cMillies was reached without the packet being completed.
134	*
135	* @param hQueue The request queue.
136	* @param ppReq Where to store the pointer to the request.
137	* This will be NULL or a valid request pointer not matter what happens.
138	* @param cMillies Number of milliseconds to wait for the request to
139	* be completed. Use RT_INDEFINITE_WAIT to only
140	* wait till it's completed.
141	* @param pfnFunction Pointer to the function to call.
142	* @param cArgs Number of arguments following in the ellipsis.
143	* @param ... Function arguments.
144	*
145	* @remarks See remarks on RTReqQueueCallV.
146	*/
147	RTDECL(int) RTReqQueueCall(RTREQQUEUE hQueue, PRTREQ *ppReq, RTMSINTERVAL cMillies, PFNRT pfnFunction, unsigned cArgs, ...);
148
149	/**
150	* Allocate and queue a call request to a void function.
151	*
152	* If it's desired to poll on the completion of the request set cMillies
153	* to 0 and use RTReqWait() to check for completion. In the other case
154	* use RT_INDEFINITE_WAIT.
155	* The returned request packet must be freed using RTReqRelease().
156	*
157	* @returns iprt status code.
158	* Will not return VERR_INTERRUPTED.
159	* @returns VERR_TIMEOUT if cMillies was reached without the packet being completed.
160	*
161	* @param hQueue The request queue.
162	* @param ppReq Where to store the pointer to the request.
163	* This will be NULL or a valid request pointer not matter what happens.
164	* @param cMillies Number of milliseconds to wait for the request to
165	* be completed. Use RT_INDEFINITE_WAIT to only
166	* wait till it's completed.
167	* @param pfnFunction Pointer to the function to call.
168	* @param cArgs Number of arguments following in the ellipsis.
169	* @param ... Function arguments.
170	*
171	* @remarks See remarks on RTReqQueueCallV.
172	*/
173	RTDECL(int) RTReqQueueCallVoid(RTREQQUEUE hQueue, PRTREQ *ppReq, RTMSINTERVAL cMillies, PFNRT pfnFunction, unsigned cArgs, ...);
174
175	/**
176	* Allocate and queue a call request to a void function.
177	*
178	* If it's desired to poll on the completion of the request set cMillies
179	* to 0 and use RTReqWait() to check for completion. In the other case
180	* use RT_INDEFINITE_WAIT.
181	* The returned request packet must be freed using RTReqRelease().
182	*
183	* @returns iprt status code.
184	* Will not return VERR_INTERRUPTED.
185	* @returns VERR_TIMEOUT if cMillies was reached without the packet being completed.
186	*
187	* @param hQueue The request queue.
188	* @param ppReq Where to store the pointer to the request.
189	* This will be NULL or a valid request pointer not matter what happens, unless fFlags
190	* contains RTREQFLAGS_NO_WAIT when it will be optional and always NULL.
191	* @param cMillies Number of milliseconds to wait for the request to
192	* be completed. Use RT_INDEFINITE_WAIT to only
193	* wait till it's completed.
194	* @param fFlags A combination of the RTREQFLAGS values.
195	* @param pfnFunction Pointer to the function to call.
196	* @param cArgs Number of arguments following in the ellipsis.
197	* @param ... Function arguments.
198	*
199	* @remarks See remarks on RTReqQueueCallV.
200	*/
201	RTDECL(int) RTReqQueueCallEx(RTREQQUEUE hQueue, PRTREQ *ppReq, RTMSINTERVAL cMillies, unsigned fFlags, PFNRT pfnFunction, unsigned cArgs, ...);
202
203	/**
204	* Allocate and queue a call request.
205	*
206	* If it's desired to poll on the completion of the request set cMillies
207	* to 0 and use RTReqWait() to check for completion. In the other case
208	* use RT_INDEFINITE_WAIT.
209	* The returned request packet must be freed using RTReqRelease().
210	*
211	* @returns iprt status code.
212	* Will not return VERR_INTERRUPTED.
213	* @returns VERR_TIMEOUT if cMillies was reached without the packet being completed.
214	*
215	* @param hQueue The request queue.
216	* @param ppReq Where to store the pointer to the request.
217	* This will be NULL or a valid request pointer not matter what happens, unless fFlags
218	* contains RTREQFLAGS_NO_WAIT when it will be optional and always NULL.
219	* @param cMillies Number of milliseconds to wait for the request to
220	* be completed. Use RT_INDEFINITE_WAIT to only
221	* wait till it's completed.
222	* @param fFlags A combination of the RTREQFLAGS values.
223	* @param pfnFunction Pointer to the function to call.
224	* @param cArgs Number of arguments following in the ellipsis.
225	* @param Args Variable argument vector.
226	*
227	* @remarks Caveats:
228	* - Do not pass anything which is larger than an uintptr_t.
229	* - 64-bit integers are larger than uintptr_t on 32-bit hosts.
230	* Pass integers > 32-bit by reference (pointers).
231	* - Don't use NULL since it should be the integer 0 in C++ and may
232	* therefore end up with garbage in the bits 63:32 on 64-bit
233	* hosts because 'int' is 32-bit.
234	* Use (void *)NULL or (uintptr_t)0 instead of NULL.
235	*/
236	RTDECL(int) RTReqQueueCallV(RTREQQUEUE hQueue, PRTREQ *ppReq, RTMSINTERVAL cMillies, unsigned fFlags, PFNRT pfnFunction, unsigned cArgs, va_list Args);
237
238	/**
239	* Checks if the queue is busy or not.
240	*
241	* The caller is responsible for dealing with any concurrent submitts.
242	*
243	* @returns true if busy, false if idle.
244	* @param hQueue The queue.
245	*/
246	RTDECL(bool) RTReqQueueIsBusy(RTREQQUEUE hQueue);
247
248	/**
249	* Allocates a request packet.
250	*
251	* The caller allocates a request packet, fills in the request data
252	* union and queues the request.
253	*
254	* @returns iprt status code.
255	*
256	* @param hQueue The request queue.
257	* @param enmType Package type.
258	* @param phReq Where to store the handle to the new request.
259	*/
260	RTDECL(int) RTReqQueueAlloc(RTREQQUEUE hQueue, RTREQTYPE enmType, PRTREQ *phReq);
261
262
263	/**
264	* Creates a request thread pool.
265	*
266	* The core configuration is given as parameters, finer pool tuning can be
267	* achieved via RTReqPoolSetCfgVar.
268	*
269	* @returns IPRT status code.
270	* @param cMaxThreads The maximum number of worker threads.
271	* UINT32_MAX is an alias for the highest
272	* allowed thread count.
273	* @param cMsMinIdle The number of milliseconds a worker
274	* thread needs to be idle before it is
275	* considered for shutdown. The value
276	* RT_INDEFINITE_WAIT disables automatic
277	* idle thread shutdown.
278	* @param cThreadsPushBackThreshold At which worker thread count the push
279	* back should kick in.
280	* @param cMsMaxPushBack The max number of milliseconds to push
281	* back a submitter. UINT32_MAX is an
282	* alias for the highest allowed push back.
283	* @param pszName The pool name. Keep it short as it is
284	* used for naming worker threads.
285	* @param phPool Where to return the pool handle.
286	*/
287	RTDECL(int) RTReqPoolCreate(uint32_t cMaxThreads, RTMSINTERVAL cMsMinIdle,
288	uint32_t cThreadsPushBackThreshold, uint32_t cMsMaxPushBack,
289	const char *pszName, PRTREQPOOL phPool);
290
291	/**
292	* Retainsa reference to a request thread pool.
293	*
294	* @returns The new reference count, UINT32_MAX on invalid handle (asserted).
295	* @param hPool The request thread pool handle.
296	*/
297	RTDECL(uint32_t) RTReqPoolRetain(RTREQPOOL hPool);
298
299	/**
300	* Releases a reference to the request thread pool.
301	*
302	* When the reference count reaches zero, the request will be pooled for reuse.
303	*
304	* @returns The new reference count, UINT32_MAX on invalid handle (asserted).
305	* @param hPool The request thread pool handle.
306	*/
307	RTDECL(uint32_t) RTReqPoolRelease(RTREQPOOL hPool);
308
309	/**
310	* Request thread pool configuration variable.
311	*/
312	typedef enum RTREQPOOLCFGVAR
313	{
314	/** Invalid zero value. */
315	RTREQPOOLCFGVAR_INVALID = 0,
316	/** The desired RTTHREADTYPE of the worker threads. */
317	RTREQPOOLCFGVAR_THREAD_TYPE,
318	/** The minimum number of threads to keep handy once spawned. */
319	RTREQPOOLCFGVAR_MIN_THREADS,
320	/** The maximum number of thread to start. */
321	RTREQPOOLCFGVAR_MAX_THREADS,
322	/** The minimum number of milliseconds a worker thread needs to be idle
323	* before we consider shutting it down. The other shutdown criteria
324	* being set by RTREQPOOLCFGVAR_MIN_THREADS. The value
325	* RT_INDEFINITE_WAIT can be used to disable shutting down idle threads. */
326	RTREQPOOLCFGVAR_MS_MIN_IDLE,
327	/** The sleep period, in milliseoncds, to employ when idling. The value
328	* RT_INDEFINITE_WAIT can be used to disable shutting down idle threads. */
329	RTREQPOOLCFGVAR_MS_IDLE_SLEEP,
330	/** The number of threads at which to start pushing back. The value
331	* UINT64_MAX is an alias for the current upper thread count limit, i.e.
332	* disabling push back. The value 0 (zero) is an alias for the current
333	* lower thread count, a good value to start pushing back at. The value
334	* must otherwise be within */
335	RTREQPOOLCFGVAR_PUSH_BACK_THRESHOLD,
336	/** The minimum push back time in milliseconds. */
337	RTREQPOOLCFGVAR_PUSH_BACK_MIN_MS,
338	/** The maximum push back time in milliseconds. */
339	RTREQPOOLCFGVAR_PUSH_BACK_MAX_MS,
340	/** The maximum number of free requests to keep handy for recycling. */
341	RTREQPOOLCFGVAR_MAX_FREE_REQUESTS,
342	/** The end of the range of valid config variables. */
343	RTREQPOOLCFGVAR_END,
344	/** Blow the type up to 32-bits. */
345	RTREQPOOLCFGVAR_32BIT_HACK = 0x7fffffff
346	} RTREQPOOLCFGVAR;
347
348
349	/**
350	* Sets a config variable for a request thread pool.
351	*
352	* @returns IPRT status code.
353	* @param hPool The pool handle.
354	* @param enmVar The variable to set.
355	* @param uValue The new value.
356	*/
357	RTDECL(int) RTReqPoolSetCfgVar(RTREQPOOL hPool, RTREQPOOLCFGVAR enmVar, uint64_t uValue);
358
359	/**
360	* Gets a config variable for a request thread pool.
361	*
362	* @returns The value, UINT64_MAX on invalid parameters.
363	* @param hPool The pool handle.
364	* @param enmVar The variable to query.
365	*/
366	RTDECL(uint64_t) RTReqPoolGetCfgVar(RTREQPOOL hPool, RTREQPOOLCFGVAR enmVar);
367
368	/**
369	* Request thread pool statistics value names.
370	*/
371	typedef enum RTREQPOOLSTAT
372	{
373	/** The invalid zero value, as per tradition. */
374	RTREQPOOLSTAT_INVALID = 0,
375	/** The current number of worker threads. */
376	RTREQPOOLSTAT_THREADS,
377	/** The number of threads that have been created. */
378	RTREQPOOLSTAT_THREADS_CREATED,
379	/** The total number of requests that have been processed. */
380	RTREQPOOLSTAT_REQUESTS_PROCESSED,
381	/** The total number of requests that have been submitted. */
382	RTREQPOOLSTAT_REQUESTS_SUBMITTED,
383	/** the current number of pending (waiting) requests. */
384	RTREQPOOLSTAT_REQUESTS_PENDING,
385	/** The current number of active (executing) requests. */
386	RTREQPOOLSTAT_REQUESTS_ACTIVE,
387	/** The current number of free (recycled) requests. */
388	RTREQPOOLSTAT_REQUESTS_FREE,
389	/** Total time the requests took to process. */
390	RTREQPOOLSTAT_NS_TOTAL_REQ_PROCESSING,
391	/** Total time the requests had to wait in the queue before being
392	* scheduled. */
393	RTREQPOOLSTAT_NS_TOTAL_REQ_QUEUED,
394	/** Average time the requests took to process. */
395	RTREQPOOLSTAT_NS_AVERAGE_REQ_PROCESSING,
396	/** Average time the requests had to wait in the queue before being
397	* scheduled. */
398	RTREQPOOLSTAT_NS_AVERAGE_REQ_QUEUED,
399	/** The end of the valid statistics value names. */
400	RTREQPOOLSTAT_END,
401	/** Blow the type up to 32-bit. */
402	RTREQPOOLSTAT_32BIT_HACK = 0x7fffffff
403	} RTREQPOOLSTAT;
404
405	/**
406	* Read a statistics value from the request thread pool.
407	*
408	* @returns The value, UINT64_MAX if an invalid parameter was given.
409	* @param hPool The request thread pool handle.
410	* @param enmStat The statistics value to get.
411	*/
412	RTDECL(uint64_t) RTReqPoolGetStat(RTREQPOOL hPool, RTREQPOOLSTAT enmStat);
413
414	/**
415	* Allocates a request packet.
416	*
417	* This is mostly for internal use, please use the convenience methods.
418	*
419	* @returns iprt status code.
420	*
421	* @param hPool The request thread pool handle.
422	* @param enmType Package type.
423	* @param phReq Where to store the handle to the new request.
424	*/
425	RTDECL(int) RTReqPoolAlloc(RTREQPOOL hPool, RTREQTYPE enmType, PRTREQ *phReq);
426
427	/**
428	* Call a function on a worker thread.
429	*
430	* @returns IPRT status code.
431	* @param hPool The request thread pool handle.
432	* @param cMillies The number of milliseconds to wait for the request
433	* to be processed.
434	* @param phReq Where to return the request. Can be NULL if the
435	* RTREQFLAGS_NO_WAIT flag is used.
436	* @param fFlags A combination of RTREQFLAGS values.
437	* @param pfnFunction The function to be called. Must be declared by a
438	* DECL macro because of calling conventions.
439	* @param cArgs The number of arguments in the ellipsis.
440	* @param ... Arguments.
441	*
442	* @remarks The function better avoid taking uint64_t and structs as part of the
443	* arguments (use pointers to these instead). In general anything
444	* that's larger than an uintptr_t is problematic.
445	*/
446	RTDECL(int) RTReqPoolCallEx( RTREQPOOL hPool, RTMSINTERVAL cMillies, PRTREQ *phReq, uint32_t fFlags, PFNRT pfnFunction, unsigned cArgs, ...);
447
448
449	/**
450	* Call a function on a worker thread.
451	*
452	* @returns IPRT status code.
453	* @param hPool The request thread pool handle.
454	* @param cMillies The number of milliseconds to wait for the request
455	* to be processed.
456	* @param phReq Where to return the request. Can be NULL if the
457	* RTREQFLAGS_NO_WAIT flag is used.
458	* @param fFlags A combination of RTREQFLAGS values.
459	* @param pfnFunction The function to be called. Must be declared by a
460	* DECL macro because of calling conventions.
461	* @param cArgs The number of arguments in the variable argument
462	* list.
463	* @param va Arguments.
464	* @remarks See remarks on RTReqPoolCallEx.
465	*/
466	RTDECL(int) RTReqPoolCallExV(RTREQPOOL hPool, RTMSINTERVAL cMillies, PRTREQ *phReq, uint32_t fFlags, PFNRT pfnFunction, unsigned cArgs, va_list va);
467
468	/**
469	* Call a function on a worker thread, wait for it to return.
470	*
471	* @returns IPRT status code returned by @a pfnFunction or request pool error.
472	* @param hPool The request thread pool handle.
473	* @param pfnFunction The function to be called. Must be declared by a
474	* DECL macro because of calling conventions. The
475	* function must return an int value compatible with
476	* the IPRT status code convention.
477	* @param cArgs The number of arguments in the elipsis.
478	* @param ... Arguments.
479	* @remarks See remarks on RTReqPoolCallEx.
480	*/
481	RTDECL(int) RTReqPoolCallWait(RTREQPOOL hPool, PFNRT pfnFunction, unsigned cArgs, ...);
482
483	/**
484	* Call a function on a worker thread, don't wait for it to return.
485	*
486	* @returns IPRT status code.
487	* @param hPool The request thread pool handle.
488	* @param pfnFunction The function to be called. Must be declared by a
489	* DECL macro because of calling conventions. The
490	* function should return an int value compatible with
491	* the IPRT status code convention, thought it's not
492	* all that important as it's thrown away.
493	* @param cArgs The number of arguments in the elipsis.
494	* @param ... Arguments.
495	* @remarks See remarks on RTReqPoolCallEx.
496	*/
497	RTDECL(int) RTReqPoolCallNoWait(RTREQPOOL hPool, PFNRT pfnFunction, unsigned cArgs, ...);
498
499	/**
500	* Call a void function on a worker thread.
501	*
502	* @returns IPRT status code.
503	* @param hPool The request thread pool handle.
504	* @param pfnFunction The function to be called. Must be declared by a
505	* DECL macro because of calling conventions. The
506	* function is taken to return void.
507	* @param cArgs The number of arguments in the elipsis.
508	* @param ... Arguments.
509	* @remarks See remarks on RTReqPoolCallEx.
510	*/
511	RTDECL(int) RTReqPoolCallVoidWait(RTREQPOOL hPool, PFNRT pfnFunction, unsigned cArgs, ...);
512
513	/**
514	* Call a void function on a worker thread, don't wait for it to return.
515	*
516	* @returns IPRT status code.
517	* @param hPool The request thread pool handle.
518	* @param pfnFunction The function to be called. Must be declared by a
519	* DECL macro because of calling conventions. The
520	* function is taken to return void.
521	* @param cArgs The number of arguments in the elipsis.
522	* @param ... Arguments.
523	* @remarks See remarks on RTReqPoolCallEx.
524	*/
525	RTDECL(int) RTReqPoolCallVoidNoWait(RTREQPOOL hPool, PFNRT pfnFunction, unsigned cArgs, ...);
526
527
528	/**
529	* Retainsa reference to a request.
530	*
531	* @returns The new reference count, UINT32_MAX on invalid handle (asserted).
532	* @param hReq The request handle.
533	*/
534	RTDECL(uint32_t) RTReqRetain(PRTREQ hReq);
535
536	/**
537	* Releases a reference to the request.
538	*
539	* When the reference count reaches zero, the request will be pooled for reuse.
540	*
541	* @returns The new reference count, UINT32_MAX on invalid handle (asserted).
542	* @param hReq Package to release.
543	*/
544	RTDECL(uint32_t) RTReqRelease(PRTREQ hReq);
545
546	/**
547	* Queue a request.
548	*
549	* The quest must be allocated using RTReqQueueAlloc() or RTReqPoolAlloc() and
550	* contain all the required data.
551	*
552	* If it's desired to poll on the completion of the request set cMillies
553	* to 0 and use RTReqWait() to check for completion. In the other case
554	* use RT_INDEFINITE_WAIT.
555	*
556	* @returns iprt status code.
557	* Will not return VERR_INTERRUPTED.
558	* @returns VERR_TIMEOUT if cMillies was reached without the packet being completed.
559	*
560	* @param pReq The request to queue.
561	* @param cMillies Number of milliseconds to wait for the request to
562	* be completed. Use RT_INDEFINITE_WAIT to only
563	* wait till it's completed.
564	*/
565	RTDECL(int) RTReqSubmit(PRTREQ pReq, RTMSINTERVAL cMillies);
566
567
568	/**
569	* Wait for a request to be completed.
570	*
571	* @returns iprt status code.
572	* Will not return VERR_INTERRUPTED.
573	* @returns VERR_TIMEOUT if cMillies was reached without the packet being completed.
574	*
575	* @param pReq The request to wait for.
576	* @param cMillies Number of milliseconds to wait.
577	* Use RT_INDEFINITE_WAIT to only wait till it's completed.
578	*/
579	RTDECL(int) RTReqWait(PRTREQ pReq, RTMSINTERVAL cMillies);
580
581	/**
582	* Get the status of the request.
583	*
584	* @returns Status code in the IPRT tradition.
585	*
586	* @param pReq The request.
587	*/
588	RTDECL(int) RTReqGetStatus(PRTREQ pReq);
589
590	#endif /* IN_RING3 */
591
592
593	/** @} */
594
595	RT_C_DECLS_END
596
597	#endif
598

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