VirtualBox

source: vbox/trunk/src/VBox/Runtime/r0drv/netbsd/semevent-r0drv-netbsd.c@ 77120

Last change on this file since 77120 was 77120, checked in by vboxsync, 6 years ago

IPRT: Some license header cleanups.
  • Property svn:eol-style set to native
  • Property svn:keywords set to Author Date Id Revision
File size: 9.3 KB
Line 
1/* $Id: semevent-r0drv-netbsd.c 77120 2019-02-01 15:08:46Z vboxsync $ */
2/** @file
3 * IPRT - Single Release Event Semaphores, Ring-0 Driver, NetBSD.
4 */
5
6/*
7 * Contributed by knut st. osmundsen.
8 *
9 * Copyright (C) 2007-2019 Oracle Corporation
10 *
11 * This file is part of VirtualBox Open Source Edition (OSE), as
12 * available from http://www.virtualbox.org. This file is free software;
13 * you can redistribute it and/or modify it under the terms of the GNU
14 * General Public License (GPL) as published by the Free Software
15 * Foundation, in version 2 as it comes in the "COPYING" file of the
16 * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
17 * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
18 *
19 * The contents of this file may alternatively be used under the terms
20 * of the Common Development and Distribution License Version 1.0
21 * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
22 * VirtualBox OSE distribution, in which case the provisions of the
23 * CDDL are applicable instead of those of the GPL.
24 *
25 * You may elect to license modified versions of this file under the
26 * terms and conditions of either the GPL or the CDDL or both.
27 *
28 * --------------------------------------------------------------------
29 *
30 * Copyright (c) 2007 knut st. osmundsen <[email protected]>
31 *
32 * Permission is hereby granted, free of charge, to any person
33 * obtaining a copy of this software and associated documentation
34 * files (the "Software"), to deal in the Software without
35 * restriction, including without limitation the rights to use,
36 * copy, modify, merge, publish, distribute, sublicense, and/or sell
37 * copies of the Software, and to permit persons to whom the
38 * Software is furnished to do so, subject to the following
39 * conditions:
40 *
41 * The above copyright notice and this permission notice shall be
42 * included in all copies or substantial portions of the Software.
43 *
44 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
45 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
46 * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
47 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
48 * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
49 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
50 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
51 * OTHER DEALINGS IN THE SOFTWARE.
52 */
53
54
55/*********************************************************************************************************************************
56* Header Files *
57*********************************************************************************************************************************/
58#define RTSEMEVENT_WITHOUT_REMAPPING
59#include "the-netbsd-kernel.h"
60#include "internal/iprt.h"
61#include <iprt/semaphore.h>
62
63#include <iprt/asm.h>
64#include <iprt/assert.h>
65#include <iprt/err.h>
66#include <iprt/lockvalidator.h>
67#include <iprt/mem.h>
68
69#include "sleepqueue-r0drv-netbsd.h"
70#include "internal/magics.h"
71
72
73/*********************************************************************************************************************************
74* Structures and Typedefs *
75*********************************************************************************************************************************/
76/**
77 * NetBSD event semaphore.
78 */
79typedef struct RTSEMEVENTINTERNAL
80{
81 /** Magic value (RTSEMEVENT_MAGIC). */
82 uint32_t volatile u32Magic;
83 /** The object status - !0 when signaled and 0 when reset. */
84 uint32_t volatile fState;
85 /** Reference counter. */
86 uint32_t volatile cRefs;
87} RTSEMEVENTINTERNAL, *PRTSEMEVENTINTERNAL;
88
89
90RTDECL(int) RTSemEventCreate(PRTSEMEVENT phEventSem)
91{
92 return RTSemEventCreateEx(phEventSem, 0 /*fFlags*/, NIL_RTLOCKVALCLASS, NULL);
93}
94
95
96RTDECL(int) RTSemEventCreateEx(PRTSEMEVENT phEventSem, uint32_t fFlags, RTLOCKVALCLASS hClass, const char *pszNameFmt, ...)
97{
98 AssertCompile(sizeof(RTSEMEVENTINTERNAL) > sizeof(void *));
99 AssertReturn(!(fFlags & ~(RTSEMEVENT_FLAGS_NO_LOCK_VAL | RTSEMEVENT_FLAGS_BOOTSTRAP_HACK)), VERR_INVALID_PARAMETER);
100 Assert(!(fFlags & RTSEMEVENT_FLAGS_BOOTSTRAP_HACK) || (fFlags & RTSEMEVENT_FLAGS_NO_LOCK_VAL));
101 AssertPtrReturn(phEventSem, VERR_INVALID_POINTER);
102
103 PRTSEMEVENTINTERNAL pThis = (PRTSEMEVENTINTERNAL)RTMemAllocZ(sizeof(*pThis));
104 if (!pThis)
105 return VERR_NO_MEMORY;
106
107 pThis->u32Magic = RTSEMEVENT_MAGIC;
108 pThis->cRefs = 1;
109 pThis->fState = 0;
110
111 *phEventSem = pThis;
112 return VINF_SUCCESS;
113}
114
115
116/**
117 * Retains a reference to the event semaphore.
118 *
119 * @param pThis The event semaphore.
120 */
121DECLINLINE(void) rtR0SemEventBsdRetain(PRTSEMEVENTINTERNAL pThis)
122{
123 uint32_t cRefs = ASMAtomicIncU32(&pThis->cRefs);
124 Assert(cRefs < 100000); NOREF(cRefs);
125}
126
127
128/**
129 * Releases a reference to the event semaphore.
130 *
131 * @param pThis The event semaphore.
132 */
133DECLINLINE(void) rtR0SemEventBsdRelease(PRTSEMEVENTINTERNAL pThis)
134{
135 if (RT_UNLIKELY(ASMAtomicDecU32(&pThis->cRefs) == 0))
136 RTMemFree(pThis);
137}
138
139
140RTDECL(int) RTSemEventDestroy(RTSEMEVENT hEventSem)
141{
142 /*
143 * Validate input.
144 */
145 PRTSEMEVENTINTERNAL pThis = hEventSem;
146 if (pThis == NIL_RTSEMEVENT)
147 return VINF_SUCCESS;
148 AssertMsgReturn(pThis->u32Magic == RTSEMEVENT_MAGIC, ("pThis->u32Magic=%RX32 pThis=%p\n", pThis->u32Magic, pThis), VERR_INVALID_HANDLE);
149 Assert(pThis->cRefs > 0);
150
151 /*
152 * Invalidate it and signal the object just in case.
153 */
154 ASMAtomicWriteU32(&pThis->u32Magic, ~RTSEMEVENT_MAGIC);
155 ASMAtomicWriteU32(&pThis->fState, 0);
156 rtR0SemBsdBroadcast(pThis);
157 rtR0SemEventBsdRelease(pThis);
158 return VINF_SUCCESS;
159}
160
161
162RTDECL(int) RTSemEventSignal(RTSEMEVENT hEventSem)
163{
164 /*
165 * Validate input.
166 */
167 PRTSEMEVENTINTERNAL pThis = (PRTSEMEVENTINTERNAL)hEventSem;
168 AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
169 AssertMsgReturn(pThis->u32Magic == RTSEMEVENT_MAGIC, ("pThis->u32Magic=%RX32 pThis=%p\n", pThis->u32Magic, pThis), VERR_INVALID_HANDLE);
170 rtR0SemEventBsdRetain(pThis);
171
172 /*
173 * Signal the event object.
174 */
175 ASMAtomicWriteU32(&pThis->fState, 1);
176 rtR0SemBsdSignal(pThis);
177 rtR0SemEventBsdRelease(pThis);
178 return VINF_SUCCESS;
179}
180
181/**
182 * Worker for RTSemEventWaitEx and RTSemEventWaitExDebug.
183 *
184 * @returns VBox status code.
185 * @param pThis The event semaphore.
186 * @param fFlags See RTSemEventWaitEx.
187 * @param uTimeout See RTSemEventWaitEx.
188 * @param pSrcPos The source code position of the wait.
189 */
190static int rtR0SemEventWait(PRTSEMEVENTINTERNAL pThis, uint32_t fFlags, uint64_t uTimeout,
191 PCRTLOCKVALSRCPOS pSrcPos)
192{
193 int rc;
194
195 /*
196 * Validate the input.
197 */
198 AssertPtrReturn(pThis, VERR_INVALID_PARAMETER);
199 AssertMsgReturn(pThis->u32Magic == RTSEMEVENT_MAGIC, ("%p u32Magic=%RX32\n", pThis, pThis->u32Magic), VERR_INVALID_PARAMETER);
200 AssertReturn(RTSEMWAIT_FLAGS_ARE_VALID(fFlags), VERR_INVALID_PARAMETER);
201 rtR0SemEventBsdRetain(pThis);
202
203 /*
204 * Try grab the event without setting up the wait.
205 */
206 if (ASMAtomicCmpXchgU32(&pThis->fState, 0, 1))
207 rc = VINF_SUCCESS;
208 else
209 {
210 /*
211 * We have to wait.
212 */
213 RTR0SEMBSDSLEEP Wait;
214 rc = rtR0SemBsdWaitInit(&Wait, fFlags, uTimeout, pThis);
215 if (RT_SUCCESS(rc))
216 {
217 for (;;)
218 {
219 /* The destruction test. */
220 if (RT_UNLIKELY(pThis->u32Magic != RTSEMEVENT_MAGIC))
221 rc = VERR_SEM_DESTROYED;
222 else
223 {
224 rtR0SemBsdWaitPrepare(&Wait);
225
226 /* Check the exit conditions. */
227 if (RT_UNLIKELY(pThis->u32Magic != RTSEMEVENT_MAGIC))
228 rc = VERR_SEM_DESTROYED;
229 else if (ASMAtomicCmpXchgU32(&pThis->fState, 0, 1))
230 rc = VINF_SUCCESS;
231 else if (rtR0SemBsdWaitHasTimedOut(&Wait))
232 rc = VERR_TIMEOUT;
233 else if (rtR0SemBsdWaitWasInterrupted(&Wait))
234 rc = VERR_INTERRUPTED;
235 else
236 {
237 /* Do the wait and then recheck the conditions. */
238 rtR0SemBsdWaitDoIt(&Wait);
239 continue;
240 }
241 }
242 break;
243 }
244
245 rtR0SemBsdWaitDelete(&Wait);
246 }
247 }
248
249 rtR0SemEventBsdRelease(pThis);
250 return rc;
251}
252
253
254RTDECL(int) RTSemEventWaitEx(RTSEMEVENT hEventSem, uint32_t fFlags, uint64_t uTimeout)
255{
256#ifndef RTSEMEVENT_STRICT
257 return rtR0SemEventWait(hEventSem, fFlags, uTimeout, NULL);
258#else
259 RTLOCKVALSRCPOS SrcPos = RTLOCKVALSRCPOS_INIT_NORMAL_API();
260 return rtR0SemEventWait(hEventSem, fFlags, uTimeout, &SrcPos);
261#endif
262}
263RT_EXPORT_SYMBOL(RTSemEventWaitEx);
264
265
266RTDECL(int) RTSemEventWaitExDebug(RTSEMEVENT hEventSem, uint32_t fFlags, uint64_t uTimeout,
267 RTHCUINTPTR uId, RT_SRC_POS_DECL)
268{
269 RTLOCKVALSRCPOS SrcPos = RTLOCKVALSRCPOS_INIT_DEBUG_API();
270 return rtR0SemEventWait(hEventSem, fFlags, uTimeout, &SrcPos);
271}
272RT_EXPORT_SYMBOL(RTSemEventWaitExDebug);
273
274
275RTDECL(uint32_t) RTSemEventGetResolution(void)
276{
277 return 1000000000 / hz;
278}
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