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source: vbox/trunk/src/VBox/Runtime/r0drv/freebsd/semeventmulti-r0drv-freebsd.c@ 9700

Last change on this file since 9700 was 8245, checked in by vboxsync, 17 years ago

rebranding: IPRT files again.
  • Property svn:eol-style set to native
  • Property svn:keywords set to Id
File size: 9.3 KB
Line 
1/* $Id: semeventmulti-r0drv-freebsd.c 8245 2008-04-21 17:24:28Z vboxsync $ */
2/** @file
3 * IPRT - Multiple Release Event Semaphores, Ring-0 Driver, FreeBSD.
4 */
5
6/*
7 * Copyright (c) 2007 knut st. osmundsen <[email protected]>
8 *
9 * Permission is hereby granted, free of charge, to any person
10 * obtaining a copy of this software and associated documentation
11 * files (the "Software"), to deal in the Software without
12 * restriction, including without limitation the rights to use,
13 * copy, modify, merge, publish, distribute, sublicense, and/or sell
14 * copies of the Software, and to permit persons to whom the
15 * Software is furnished to do so, subject to the following
16 * conditions:
17 *
18 * The above copyright notice and this permission notice shall be
19 * included in all copies or substantial portions of the Software.
20 *
21 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
22 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
23 * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
24 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
25 * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
26 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
27 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
28 * OTHER DEALINGS IN THE SOFTWARE.
29 */
30
31/*******************************************************************************
32* Header Files *
33*******************************************************************************/
34#include "the-freebsd-kernel.h"
35
36#include <iprt/semaphore.h>
37#include <iprt/alloc.h>
38#include <iprt/asm.h>
39#include <iprt/assert.h>
40#include <iprt/err.h>
41
42#include "internal/magics.h"
43
44
45/*******************************************************************************
46* Structures and Typedefs *
47*******************************************************************************/
48/**
49 * FreeBSD multiple release event semaphore.
50 */
51typedef struct RTSEMEVENTMULTIINTERNAL
52{
53 /** Magic value (RTSEMEVENTMULTI_MAGIC). */
54 uint32_t volatile u32Magic;
55 /** The number of waiting threads. */
56 uint32_t volatile cWaiters;
57 /** Set if the event object is signaled. */
58 uint8_t volatile fSignaled;
59 /** The number of threads in the process of waking up. */
60 uint32_t volatile cWaking;
61 /** The FreeBSD spinlock protecting this structure. */
62 struct mtx Mtx;
63} RTSEMEVENTMULTIINTERNAL, *PRTSEMEVENTMULTIINTERNAL;
64
65
66RTDECL(int) RTSemEventMultiCreate(PRTSEMEVENTMULTI pEventMultiSem)
67{
68 Assert(sizeof(RTSEMEVENTMULTIINTERNAL) > sizeof(void *));
69 AssertPtrReturn(pEventMultiSem, VERR_INVALID_POINTER);
70
71 PRTSEMEVENTMULTIINTERNAL pEventMultiInt = (PRTSEMEVENTMULTIINTERNAL)RTMemAlloc(sizeof(*pEventMultiInt));
72 if (pEventMultiInt)
73 {
74 pEventMultiInt->u32Magic = RTSEMEVENTMULTI_MAGIC;
75 pEventMultiInt->cWaiters = 0;
76 pEventMultiInt->cWaking = 0;
77 pEventMultiInt->fSignaled = 0;
78 mtx_init(&pEventMultiInt->Mtx, "IPRT Multiple Release Event Semaphore", NULL, MTX_SPIN);
79 *pEventMultiSem = pEventMultiInt;
80 return VINF_SUCCESS;
81 }
82 return VERR_NO_MEMORY;
83}
84
85
86RTDECL(int) RTSemEventMultiDestroy(RTSEMEVENTMULTI EventMultiSem)
87{
88 if (EventMultiSem == NIL_RTSEMEVENTMULTI) /* don't bitch */
89 return VERR_INVALID_HANDLE;
90 PRTSEMEVENTMULTIINTERNAL pEventMultiInt = (PRTSEMEVENTMULTIINTERNAL)EventMultiSem;
91 AssertPtrReturn(pEventMultiInt, VERR_INVALID_HANDLE);
92 AssertMsgReturn(pEventMultiInt->u32Magic == RTSEMEVENTMULTI_MAGIC,
93 ("pEventMultiInt=%p u32Magic=%#x\n", pEventMultiInt, pEventMultiInt->u32Magic),
94 VERR_INVALID_HANDLE);
95
96 mtx_lock_spin(&pEventMultiInt->Mtx);
97 ASMAtomicIncU32(&pEventMultiInt->u32Magic); /* make the handle invalid */
98 if (pEventMultiInt->cWaiters > 0)
99 {
100 /* abort waiting thread, last man cleans up. */
101 ASMAtomicXchgU32(&pEventMultiInt->cWaking, pEventMultiInt->cWaking + pEventMultiInt->cWaiters);
102 wakeup(pEventMultiInt);
103 mtx_unlock_spin(&pEventMultiInt->Mtx);
104 }
105 else if (pEventMultiInt->cWaking)
106 /* the last waking thread is gonna do the cleanup */
107 mtx_unlock_spin(&pEventMultiInt->Mtx);
108 else
109 {
110 mtx_unlock_spin(&pEventMultiInt->Mtx);
111 mtx_destroy(&pEventMultiInt->Mtx);
112 RTMemFree(pEventMultiInt);
113 }
114
115 return VINF_SUCCESS;
116}
117
118
119RTDECL(int) RTSemEventMultiSignal(RTSEMEVENTMULTI EventMultiSem)
120{
121 PRTSEMEVENTMULTIINTERNAL pEventMultiInt = (PRTSEMEVENTMULTIINTERNAL)EventMultiSem;
122 AssertPtrReturn(pEventMultiInt, VERR_INVALID_HANDLE);
123 AssertMsgReturn(pEventMultiInt->u32Magic == RTSEMEVENTMULTI_MAGIC,
124 ("pEventMultiInt=%p u32Magic=%#x\n", pEventMultiInt, pEventMultiInt->u32Magic),
125 VERR_INVALID_HANDLE);
126
127 mtx_lock_spin(&pEventMultiInt->Mtx);
128
129 ASMAtomicXchgU8(&pEventMultiInt->fSignaled, true);
130 if (pEventMultiInt->cWaiters > 0)
131 {
132 ASMAtomicXchgU32(&pEventMultiInt->cWaking, pEventMultiInt->cWaking + pEventMultiInt->cWaiters);
133 ASMAtomicXchgU32(&pEventMultiInt->cWaiters, 0);
134 wakeup(pEventMultiInt);
135 }
136
137 mtx_unlock_spin(&pEventMultiInt->Mtx);
138 return VINF_SUCCESS;
139}
140
141
142RTDECL(int) RTSemEventMultiReset(RTSEMEVENTMULTI EventMultiSem)
143{
144 PRTSEMEVENTMULTIINTERNAL pEventMultiInt = (PRTSEMEVENTMULTIINTERNAL)EventMultiSem;
145 AssertPtrReturn(pEventMultiInt, VERR_INVALID_HANDLE);
146 AssertMsgReturn(pEventMultiInt->u32Magic == RTSEMEVENTMULTI_MAGIC,
147 ("pEventMultiInt=%p u32Magic=%#x\n", pEventMultiInt, pEventMultiInt->u32Magic),
148 VERR_INVALID_HANDLE);
149
150 mtx_lock_spin(&pEventMultiInt->Mtx);
151 ASMAtomicXchgU8(&pEventMultiInt->fSignaled, false);
152 mtx_unlock_spin(&pEventMultiInt->Mtx);
153 return VINF_SUCCESS;
154}
155
156
157static int rtSemEventMultiWait(RTSEMEVENTMULTI EventMultiSem, unsigned cMillies, bool fInterruptible)
158{
159 int rc;
160 PRTSEMEVENTMULTIINTERNAL pEventMultiInt = (PRTSEMEVENTMULTIINTERNAL)EventMultiSem;
161 AssertPtrReturn(pEventMultiInt, VERR_INVALID_HANDLE);
162 AssertMsgReturn(pEventMultiInt->u32Magic == RTSEMEVENTMULTI_MAGIC,
163 ("pEventMultiInt=%p u32Magic=%#x\n", pEventMultiInt, pEventMultiInt->u32Magic),
164 VERR_INVALID_HANDLE);
165
166 mtx_lock_spin(&pEventMultiInt->Mtx);
167
168 if (pEventMultiInt->fSignaled)
169 rc = VINF_SUCCESS;
170 else
171 {
172 /*
173 * Translate milliseconds into ticks and go to sleep.
174 */
175 int cTicks;
176 if (cMillies != RT_INDEFINITE_WAIT)
177 {
178 if (hz == 1000)
179 cTicks = cMillies;
180 else if (hz == 100)
181 cTicks = cMillies / 10;
182 else
183 {
184 int64_t cTicks64 = ((uint64_t)cMillies * hz) / 1000;
185 cTicks = (int)cTicks64;
186 if (cTicks != cTicks64)
187 cTicks = INT_MAX;
188 }
189 }
190 else
191 cTicks = 0;
192
193 ASMAtomicIncU32(&pEventMultiInt->cWaiters);
194
195 rc = msleep(pEventMultiInt, /* block id */
196 &pEventMultiInt->Mtx,
197 fInterruptible ? PZERO | PCATCH : PZERO,
198 "iprtev", /* max 6 chars */
199 cTicks);
200 switch (rc)
201 {
202 case 0:
203 if (pEventMultiInt->u32Magic == RTSEMEVENTMULTI_MAGIC)
204 {
205 ASMAtomicDecU32(&pEventMultiInt->cWaking);
206 rc = VINF_SUCCESS;
207 }
208 else
209 {
210 rc = VERR_SEM_DESTROYED; /** @todo this isn't necessarily correct, we've
211 * could've woken up just before destruction... */
212 if (!ASMAtomicDecU32(&pEventMultiInt->cWaking))
213 {
214 /* The event was destroyed, as the last thread do the cleanup.
215 we don't actually know whether */
216 mtx_unlock_spin(&pEventMultiInt->Mtx);
217 mtx_destroy(&pEventMultiInt->Mtx);
218 RTMemFree(pEventMultiInt);
219 return rc;
220 }
221 }
222 break;
223
224 case EWOULDBLOCK:
225 Assert(cMillies != RT_INDEFINITE_WAIT);
226 if (pEventMultiInt->cWaiters > 0)
227 ASMAtomicDecU32(&pEventMultiInt->cWaiters);
228 rc = VERR_TIMEOUT;
229 break;
230
231 case EINTR:
232 case ERESTART:
233 Assert(fInterruptible);
234 if (pEventMultiInt->cWaiters > 0)
235 ASMAtomicDecU32(&pEventMultiInt->cWaiters);
236 rc = VERR_INTERRUPTED;
237 break;
238
239 default:
240 AssertMsgFailed(("msleep -> %d\n", rc));
241 rc = VERR_GENERAL_FAILURE;
242 break;
243 }
244 }
245
246 mtx_unlock_spin(&pEventMultiInt->Mtx);
247 return rc;
248}
249
250
251RTDECL(int) RTSemEventMultiWait(RTSEMEVENTMULTI EventMultiSem, unsigned cMillies)
252{
253 return rtSemEventMultiWait(EventMultiSem, cMillies, false /* not interruptible */);
254}
255
256
257RTDECL(int) RTSemEventMultiWaitNoResume(RTSEMEVENTMULTI EventMultiSem, unsigned cMillies)
258{
259 return rtSemEventMultiWait(EventMultiSem, cMillies, true /* interruptible */);
260}
261
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