1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
|
/** @file
* IPRT - Condition Variable.
*/
/*
* Copyright (C) 2006-2019 Oracle Corporation
*
* This file is part of VirtualBox Open Source Edition (OSE), as
* available from http://www.virtualbox.org. This file is free software;
* you can redistribute it and/or modify it under the terms of the GNU
* General Public License (GPL) as published by the Free Software
* Foundation, in version 2 as it comes in the "COPYING" file of the
* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
*
* The contents of this file may alternatively be used under the terms
* of the Common Development and Distribution License Version 1.0
* (CDDL) only, as it comes in the "COPYING.CDDL" file of the
* VirtualBox OSE distribution, in which case the provisions of the
* CDDL are applicable instead of those of the GPL.
*
* You may elect to license modified versions of this file under the
* terms and conditions of either the GPL or the CDDL or both.
*/
#ifndef IPRT_INCLUDED_condvar_h
#define IPRT_INCLUDED_condvar_h
#ifndef RT_WITHOUT_PRAGMA_ONCE
# pragma once
#endif
#include <iprt/cdefs.h>
#include <iprt/types.h>
#if defined(RT_LOCK_STRICT_ORDER) && defined(IN_RING3)
# include <iprt/lockvalidator.h>
#endif
RT_C_DECLS_BEGIN
/** @defgroup grp_rt_condvar RTCondVar - Condition Variable
*
* Condition variables combines mutex semaphore or critical sections with event
* semaphores. See @ref grp_rt_sems_mutex, @ref grp_rt_critsect,
* @ref grp_rt_sems_event and @ref grp_rt_sems_event_multi.
*
* @ingroup grp_rt
* @{
*/
/**
* Create a condition variable.
*
* @returns iprt status code.
* @param phCondVar Where to store the handle to the newly created
* condition variable.
*/
RTDECL(int) RTCondVarCreate(PRTCONDVAR phCondVar);
/**
* Create a condition variable.
*
* @returns iprt status code.
* @param phCondVar Where to store the handle to the newly created
* condition variable.
* @param fFlags Flags, any combination of the
* RTCONDVAR_FLAGS_XXX \#defines.
* @param hClass The class (no reference consumed). Since we
* don't do order checks on condition variables,
* the use of the class is limited to controlling
* the timeout threshold for deadlock detection.
* @param pszNameFmt Name format string for the lock validator,
* optional (NULL). Max length is 32 bytes.
* @param ... Format string arguments.
*/
RTDECL(int) RTCondVarCreateEx(PRTCONDVAR phCondVar, uint32_t fFlags, RTLOCKVALCLASS hClass,
const char *pszNameFmt, ...) RT_IPRT_FORMAT_ATTR(4, 5);
/** @name RTCondVarCreateEx flags
* @{ */
/** Disables lock validation. */
#define RTCONDVAR_FLAGS_NO_LOCK_VAL UINT32_C(0x00000001)
/** @} */
/**
* Destroy a condition variable.
*
* @returns iprt status code.
* @param hCondVar Handle of the condition variable. NIL_RTCONDVAR
* is quietly ignored (VINF_SUCCESS).
*/
RTDECL(int) RTCondVarDestroy(RTCONDVAR hCondVar);
/**
* Signal the condition variable, waking up exactly one thread.
*
* It is recommended that the caller holds the associated lock, but this is not
* strictly speaking necessary.
*
* If no threads are waiting on the condition variable, the call will have no
* effect on the variable.
*
* @returns iprt status code.
* @param hCondVar The condition variable to signal.
*/
RTDECL(int) RTCondVarSignal(RTCONDVAR hCondVar);
/**
* Signal the condition variable, waking up all blocked threads.
*
* It is recommended that the caller holds the associated lock, but this is not
* strictly speaking necessary.
*
* If no threads are waiting on the condition variable, the call will have no
* effect on the variable.
*
* @returns iprt status code.
* @param hCondVar The condition variable to broadcast.
*/
RTDECL(int) RTCondVarBroadcast(RTCONDVAR hCondVar);
/**
* Wait for the condition variable to be signaled, resume on interruption.
*
* This function will resume if the wait is interrupted by an async system event
* (like a unix signal) or similar.
*
* @returns iprt status code.
* Will not return VERR_INTERRUPTED.
* @param hCondVar The condition variable to wait on.
* @param hMtx The mutex to leave during the wait and which
* will be re-enter before returning.
* @param cMillies Number of milliseconds to wait. Use
* RT_INDEFINITE_WAIT to wait forever.
*/
RTDECL(int) RTCondVarMutexWait(RTCONDVAR hCondVar, RTSEMMUTEX hMtx, RTMSINTERVAL cMillies);
/**
* Wait for the condition variable to be signaled, return on interruption.
*
* This function will not resume the wait if interrupted.
*
* @returns iprt status code.
* @param hCondVar The condition variable to wait on.
* @param hMtx The mutex to leave during the wait and which
* will be re-enter before returning.
* @param cMillies Number of milliseconds to wait. Use
* RT_INDEFINITE_WAIT to wait forever.
*/
RTDECL(int) RTCondVarMutexWaitNoResume(RTCONDVAR hCondVar, RTSEMMUTEX hMtx, RTMSINTERVAL cMillies);
/**
* Wait for the condition variable to be signaled, resume on interruption.
*
* This function will resume if the wait is interrupted by an async system event
* (like a unix signal) or similar.
*
* @returns iprt status code.
* Will not return VERR_INTERRUPTED.
* @param hCondVar The condition variable to wait on.
* @param hRWSem The read/write semaphore to write-leave during
* the wait and which will be re-enter in write
* mode before returning.
* @param cMillies Number of milliseconds to wait. Use
* RT_INDEFINITE_WAIT to wait forever.
*/
RTDECL(int) RTCondVarRWWriteWait(RTCONDVAR hCondVar, RTSEMRW hRWSem, RTMSINTERVAL cMillies);
/**
* Wait for the condition variable to be signaled, return on interruption.
*
* This function will not resume the wait if interrupted.
*
* @returns iprt status code.
* @param hCondVar The condition variable to wait on.
* @param hRWSem The read/write semaphore to write-leave during
* the wait and which will be re-enter in write
* mode before returning.
* @param cMillies Number of milliseconds to wait. Use
* RT_INDEFINITE_WAIT to wait forever.
*/
RTDECL(int) RTCondVarRWWriteWaitNoResume(RTCONDVAR hCondVar, RTSEMRW hRWSem, RTMSINTERVAL cMillies);
/**
* Wait for the condition variable to be signaled, resume on interruption.
*
* This function will resume if the wait is interrupted by an async system event
* (like a unix signal) or similar.
*
* @returns iprt status code.
* Will not return VERR_INTERRUPTED.
* @param hCondVar The condition variable to wait on.
* @param hRWSem The read/write semaphore to read-leave during
* the wait and which will be re-enter in read mode
* before returning.
* @param cMillies Number of milliseconds to wait. Use
* RT_INDEFINITE_WAIT to wait forever.
*/
RTDECL(int) RTCondVarRWReadWait(RTCONDVAR hCondVar, RTSEMRW hRWSem, RTMSINTERVAL cMillies);
/**
* Wait for the condition variable to be signaled, return on interruption.
*
* This function will not resume the wait if interrupted.
*
* @returns iprt status code.
* @param hCondVar The condition variable to wait on.
* @param hRWSem The read/write semaphore to read-leave during
* the wait and which will be re-enter in read mode
* before returning.
* @param cMillies Number of milliseconds to wait. Use
* RT_INDEFINITE_WAIT to wait forever.
*/
RTDECL(int) RTCondVarRWReadWaitNoResume(RTCONDVAR hCondVar, RTSEMRW hRWSem, RTMSINTERVAL cMillies);
/**
* Wait for the condition variable to be signaled, resume on interruption.
*
* This function will resume if the wait is interrupted by an async system event
* (like a unix signal) or similar.
*
* @returns iprt status code.
* Will not return VERR_INTERRUPTED.
* @param hCondVar The condition variable to wait on.
* @param pCritSect The critical section to leave during the wait
* and which will be re-enter before returning.
* @param cMillies Number of milliseconds to wait. Use
* RT_INDEFINITE_WAIT to wait forever.
*/
RTDECL(int) RTCondVarCritSectWait(RTCONDVAR hCondVar, PRTCRITSECT pCritSect, RTMSINTERVAL cMillies);
/**
* Wait for the condition variable to be signaled, return on interruption.
*
* This function will not resume the wait if interrupted.
*
* @returns iprt status code.
* @param hCondVar The condition variable to wait on.
* @param pCritSect The critical section to leave during the wait
* and which will be re-enter before returning.
* @param cMillies Number of milliseconds to wait. Use
* RT_INDEFINITE_WAIT to wait forever.
*/
RTDECL(int) RTCondVarCritSectWaitNoResume(RTCONDVAR hCondVar, PRTCRITSECT pCritSect, RTMSINTERVAL cMillies);
/**
* Sets the signaller thread to one specific thread.
*
* This is only used for validating usage and deadlock detection. When used
* after calls to RTCondVarAddSignaller, the specified thread will be the only
* signalling thread.
*
* @param hCondVar The condition variable.
* @param hThread The thread that will signal it. Pass
* NIL_RTTHREAD to indicate that there is no
* special signalling thread.
*/
RTDECL(void) RTCondVarSetSignaller(RTCONDVAR hCondVar, RTTHREAD hThread);
/**
* To add more signalling threads.
*
* First call RTCondVarSetSignaller then add further threads with this.
*
* @param hCondVar The condition variable.
* @param hThread The thread that will signal it. NIL_RTTHREAD is
* not accepted.
*/
RTDECL(void) RTCondVarAddSignaller(RTCONDVAR hCondVar, RTTHREAD hThread);
/**
* To remove a signalling thread.
*
* Reverts work done by RTCondVarAddSignaller and RTCondVarSetSignaller.
*
* @param hCondVar The condition variable.
* @param hThread A previously added thread.
*/
RTDECL(void) RTCondVarRemoveSignaller(RTCONDVAR hCondVar, RTTHREAD hThread);
/** @} */
RT_C_DECLS_END
#endif /* !IPRT_INCLUDED_condvar_h */
|
