VirtualBox

source: vbox/trunk/src/VBox/Runtime/r0drv/os2/semevent-r0drv-os2.cpp@ 65466

最後變更 在這個檔案從65466是 57358,由 vboxsync 提交於 9 年 前

*: scm cleanup run.
  • 屬性 svn:eol-style 設為 native
  • 屬性 svn:keywords 設為 Id Revision
檔案大小: 9.2 KB
行 
1/* $Id: semevent-r0drv-os2.cpp 57358 2015-08-14 15:16:38Z vboxsync $ */
2/** @file
3 * IPRT - Single Release Event Semaphores, Ring-0 Driver, OS/2.
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/*********************************************************************************************************************************
33* Header Files *
34*********************************************************************************************************************************/
35#include "the-os2-kernel.h"
36#include "internal/iprt.h"
37
38#include <iprt/semaphore.h>
39#include <iprt/asm.h>
40#include <iprt/assert.h>
41#include <iprt/err.h>
42#include <iprt/mem.h>
43#include <iprt/lockvalidator.h>
44
45#include "internal/magics.h"
46
47
48/*********************************************************************************************************************************
49* Structures and Typedefs *
50*********************************************************************************************************************************/
51/**
52 * OS/2 event semaphore.
53 */
54typedef struct RTSEMEVENTINTERNAL
55{
56 /** Magic value (RTSEMEVENT_MAGIC). */
57 uint32_t volatile u32Magic;
58 /** The number of waiting threads. */
59 uint32_t volatile cWaiters;
60 /** Set if the event object is signaled. */
61 uint8_t volatile fSignaled;
62 /** The number of threads in the process of waking up. */
63 uint32_t volatile cWaking;
64 /** The OS/2 spinlock protecting this structure. */
65 SpinLock_t Spinlock;
66} RTSEMEVENTINTERNAL, *PRTSEMEVENTINTERNAL;
67
68
69RTDECL(int) RTSemEventCreate(PRTSEMEVENT phEventSem)
70{
71 return RTSemEventCreateEx(phEventSem, 0 /*fFlags*/, NIL_RTLOCKVALCLASS, NULL);
72}
73
74
75RTDECL(int) RTSemEventCreateEx(PRTSEMEVENT phEventSem, uint32_t fFlags, RTLOCKVALCLASS hClass, const char *pszNameFmt, ...)
76{
77 AssertReturn(!(fFlags & ~(RTSEMEVENT_FLAGS_NO_LOCK_VAL | RTSEMEVENT_FLAGS_BOOTSTRAP_HACK)), VERR_INVALID_PARAMETER);
78 Assert(!(fFlags & RTSEMEVENT_FLAGS_BOOTSTRAP_HACK) || (fFlags & RTSEMEVENT_FLAGS_NO_LOCK_VAL));
79 AssertCompile(sizeof(RTSEMEVENTINTERNAL) > sizeof(void *));
80 AssertPtrReturn(phEventSem, VERR_INVALID_POINTER);
81
82 PRTSEMEVENTINTERNAL pThis = (PRTSEMEVENTINTERNAL)RTMemAlloc(sizeof(*pThis));
83 if (!pThis)
84 return VERR_NO_MEMORY;
85
86 pThis->u32Magic = RTSEMEVENT_MAGIC;
87 pThis->cWaiters = 0;
88 pThis->cWaking = 0;
89 pThis->fSignaled = 0;
90 KernAllocSpinLock(&pThis->Spinlock);
91
92 *phEventSem = pThis;
93 return VINF_SUCCESS;
94}
95
96
97RTDECL(int) RTSemEventDestroy(RTSEMEVENT hEventSem)
98{
99 PRTSEMEVENTINTERNAL pThis = hEventSem;
100 if (pThis == NIL_RTSEMEVENT)
101 return VINF_SUCCESS;
102 AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
103 AssertMsgReturn(pThis->u32Magic == RTSEMEVENT_MAGIC, ("u32Magic=%RX32 pThis=%p\n", pThis->u32Magic, pThis), VERR_INVALID_HANDLE);
104
105 KernAcquireSpinLock(&pThis->Spinlock);
106 ASMAtomicIncU32(&pThis->u32Magic); /* make the handle invalid */
107 if (pThis->cWaiters > 0)
108 {
109 /* abort waiting thread, last man cleans up. */
110 ASMAtomicXchgU32(&pThis->cWaking, pThis->cWaking + pThis->cWaiters);
111 ULONG cThreads;
112 KernWakeup((ULONG)pThis, WAKEUP_DATA | WAKEUP_BOOST, &cThreads, (ULONG)VERR_SEM_DESTROYED);
113 KernReleaseSpinLock(&pThis->Spinlock);
114 }
115 else if (pThis->cWaking)
116 /* the last waking thread is gonna do the cleanup */
117 KernReleaseSpinLock(&pThis->Spinlock);
118 else
119 {
120 KernReleaseSpinLock(&pThis->Spinlock);
121 KernFreeSpinLock(&pThis->Spinlock);
122 RTMemFree(pThis);
123 }
124
125 return VINF_SUCCESS;
126}
127
128
129RTDECL(int) RTSemEventSignal(RTSEMEVENT hEventSem)
130{
131 PRTSEMEVENTINTERNAL pThis = (PRTSEMEVENTINTERNAL)hEventSem;
132 AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
133 AssertMsgReturn(pThis->u32Magic == RTSEMEVENT_MAGIC, ("u32Magic=%RX32 pThis=%p\n", pThis->u32Magic, pThis), VERR_INVALID_HANDLE);
134
135 KernAcquireSpinLock(&pThis->Spinlock);
136
137 if (pThis->cWaiters > 0)
138 {
139 ASMAtomicDecU32(&pThis->cWaiters);
140 ASMAtomicIncU32(&pThis->cWaking);
141 ULONG cThreads;
142 KernWakeup((ULONG)pThis, WAKEUP_DATA | WAKEUP_ONE, &cThreads, VINF_SUCCESS);
143 if (RT_UNLIKELY(!cThreads))
144 {
145 /* shouldn't ever happen on OS/2 */
146 ASMAtomicXchgU8(&pThis->fSignaled, true);
147 ASMAtomicDecU32(&pThis->cWaking);
148 ASMAtomicIncU32(&pThis->cWaiters);
149 }
150 }
151 else
152 ASMAtomicXchgU8(&pThis->fSignaled, true);
153
154 KernReleaseSpinLock(&pThis->Spinlock);
155 return VINF_SUCCESS;
156}
157
158
159/**
160 * Worker for RTSemEventWaitEx and RTSemEventWaitExDebug.
161 *
162 * @returns VBox status code.
163 * @param pThis The event semaphore.
164 * @param fFlags See RTSemEventWaitEx.
165 * @param uTimeout See RTSemEventWaitEx.
166 * @param pSrcPos The source code position of the wait.
167 */
168static int rtR0SemEventOs2Wait(PRTSEMEVENTINTERNAL pThis, uint32_t fFlags, uint64_t uTimeout,
169 PCRTLOCKVALSRCPOS pSrcPos)
170{
171 /*
172 * Validate and convert input.
173 */
174 if (!pThis)
175 return VERR_INVALID_HANDLE;
176 AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
177 AssertMsgReturn(pThis->u32Magic == RTSEMEVENT_MAGIC, ("u32Magic=%RX32 pThis=%p\n", pThis->u32Magic, pThis), VERR_INVALID_HANDLE);
178 AssertReturn(RTSEMWAIT_FLAGS_ARE_VALID(fFlags), VERR_INVALID_PARAMETER);
179
180 ULONG cMsTimeout = rtR0SemWaitOs2ConvertTimeout(fFlags, uTimeout);
181 ULONG fBlock = BLOCK_SPINLOCK;
182 if (!(fFlags & RTSEMWAIT_FLAGS_INTERRUPTIBLE))
183 fBlock |= BLOCK_UNINTERRUPTABLE;
184
185 /*
186 * Do the job.
187 */
188 KernAcquireSpinLock(&pThis->Spinlock);
189
190 int rc;
191 if (pThis->fSignaled)
192 {
193 Assert(!pThis->cWaiters);
194 ASMAtomicXchgU8(&pThis->fSignaled, false);
195 rc = VINF_SUCCESS;
196 }
197 else
198 {
199 ASMAtomicIncU32(&pThis->cWaiters);
200
201 ULONG ulData = (ULONG)VERR_INTERNAL_ERROR;
202 rc = KernBlock((ULONG)pThis, cMsTimeout, fBlock,
203 &pThis->Spinlock,
204 &ulData);
205 switch (rc)
206 {
207 case NO_ERROR:
208 rc = (int)ulData;
209 Assert(rc == VINF_SUCCESS || rc == VERR_SEM_DESTROYED);
210 Assert(pThis->cWaking > 0);
211 if ( !ASMAtomicDecU32(&pThis->cWaking)
212 && pThis->u32Magic != RTSEMEVENT_MAGIC)
213 {
214 /* The event was destroyed (ulData == VINF_SUCCESS if it was after we awoke), as
215 the last thread do the cleanup. */
216 KernReleaseSpinLock(&pThis->Spinlock);
217 KernFreeSpinLock(&pThis->Spinlock);
218 RTMemFree(pThis);
219 return rc;
220 }
221 break;
222
223 case ERROR_TIMEOUT:
224 Assert(cMsTimeout != SEM_INDEFINITE_WAIT);
225 ASMAtomicDecU32(&pThis->cWaiters);
226 rc = VERR_TIMEOUT;
227 break;
228
229 case ERROR_INTERRUPT:
230 Assert(fFlags & RTSEMWAIT_FLAGS_INTERRUPTIBLE);
231 ASMAtomicDecU32(&pThis->cWaiters);
232 rc = VERR_INTERRUPTED;
233 break;
234
235 default:
236 AssertMsgFailed(("rc=%d\n", rc));
237 rc = VERR_GENERAL_FAILURE;
238 break;
239 }
240 }
241
242 KernReleaseSpinLock(&pThis->Spinlock);
243 return rc;
244}
245
246
247RTDECL(int) RTSemEventWaitEx(RTSEMEVENT hEventSem, uint32_t fFlags, uint64_t uTimeout)
248{
249#ifndef RTSEMEVENT_STRICT
250 return rtR0SemEventOs2Wait(hEventSem, fFlags, uTimeout, NULL);
251#else
252 RTLOCKVALSRCPOS SrcPos = RTLOCKVALSRCPOS_INIT_NORMAL_API();
253 return rtR0SemEventOs2Wait(hEventSem, fFlags, uTimeout, &SrcPos);
254#endif
255}
256
257
258RTDECL(int) RTSemEventWaitExDebug(RTSEMEVENT hEventSem, uint32_t fFlags, uint64_t uTimeout,
259 RTHCUINTPTR uId, RT_SRC_POS_DECL)
260{
261 RTLOCKVALSRCPOS SrcPos = RTLOCKVALSRCPOS_INIT_DEBUG_API();
262 return rtR0SemEventOs2Wait(hEventSem, fFlags, uTimeout, &SrcPos);
263}
264
265
266RTDECL(uint32_t) RTSemEventGetResolution(void)
267{
268 return 32000000; /* 32ms */
269}
270
注意: 瀏覽 TracBrowser 來幫助您使用儲存庫瀏覽器

© 2024 Oracle Support Privacy / Do Not Sell My Info Terms of Use Trademark Policy Automated Access Etiquette