VirtualBox

source: vbox/trunk/src/VBox/Runtime/r0drv/freebsd/semevent-r0drv-freebsd.c@ 78398

Last change on this file since 78398 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: 9.4 KB
Line 
1/* $Id: semevent-r0drv-freebsd.c 77120 2019-02-01 15:08:46Z vboxsync $ */
2/** @file
3 * IPRT - Single Release Event Semaphores, Ring-0 Driver, FreeBSD.
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 * This code is based on:
31 *
32 * Copyright (c) 2007 knut st. osmundsen <[email protected]>
33 *
34 * Permission is hereby granted, free of charge, to any person
35 * obtaining a copy of this software and associated documentation
36 * files (the "Software"), to deal in the Software without
37 * restriction, including without limitation the rights to use,
38 * copy, modify, merge, publish, distribute, sublicense, and/or sell
39 * copies of the Software, and to permit persons to whom the
40 * Software is furnished to do so, subject to the following
41 * conditions:
42 *
43 * The above copyright notice and this permission notice shall be
44 * included in all copies or substantial portions of the Software.
45 *
46 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
47 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
48 * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
49 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
50 * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
51 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
52 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
53 * OTHER DEALINGS IN THE SOFTWARE.
54 */
55
56
57/*********************************************************************************************************************************
58* Header Files *
59*********************************************************************************************************************************/
60#define RTSEMEVENT_WITHOUT_REMAPPING
61#include "the-freebsd-kernel.h"
62#include "internal/iprt.h"
63#include <iprt/semaphore.h>
64
65#include <iprt/asm.h>
66#include <iprt/assert.h>
67#include <iprt/err.h>
68#include <iprt/lockvalidator.h>
69#include <iprt/mem.h>
70
71#include "sleepqueue-r0drv-freebsd.h"
72#include "internal/magics.h"
73
74
75/*********************************************************************************************************************************
76* Structures and Typedefs *
77*********************************************************************************************************************************/
78/**
79 * FreeBSD event semaphore.
80 */
81typedef struct RTSEMEVENTINTERNAL
82{
83 /** Magic value (RTSEMEVENT_MAGIC). */
84 uint32_t volatile u32Magic;
85 /** The object status - !0 when signaled and 0 when reset. */
86 uint32_t volatile fState;
87 /** Reference counter. */
88 uint32_t volatile cRefs;
89} RTSEMEVENTINTERNAL, *PRTSEMEVENTINTERNAL;
90
91
92RTDECL(int) RTSemEventCreate(PRTSEMEVENT phEventSem)
93{
94 return RTSemEventCreateEx(phEventSem, 0 /*fFlags*/, NIL_RTLOCKVALCLASS, NULL);
95}
96
97
98RTDECL(int) RTSemEventCreateEx(PRTSEMEVENT phEventSem, uint32_t fFlags, RTLOCKVALCLASS hClass, const char *pszNameFmt, ...)
99{
100 AssertCompile(sizeof(RTSEMEVENTINTERNAL) > sizeof(void *));
101 AssertReturn(!(fFlags & ~(RTSEMEVENT_FLAGS_NO_LOCK_VAL | RTSEMEVENT_FLAGS_BOOTSTRAP_HACK)), VERR_INVALID_PARAMETER);
102 Assert(!(fFlags & RTSEMEVENT_FLAGS_BOOTSTRAP_HACK) || (fFlags & RTSEMEVENT_FLAGS_NO_LOCK_VAL));
103 AssertPtrReturn(phEventSem, VERR_INVALID_POINTER);
104
105 PRTSEMEVENTINTERNAL pThis = (PRTSEMEVENTINTERNAL)RTMemAllocZ(sizeof(*pThis));
106 if (!pThis)
107 return VERR_NO_MEMORY;
108
109 pThis->u32Magic = RTSEMEVENT_MAGIC;
110 pThis->cRefs = 1;
111 pThis->fState = 0;
112
113 *phEventSem = pThis;
114 return VINF_SUCCESS;
115}
116
117
118/**
119 * Retains a reference to the event semaphore.
120 *
121 * @param pThis The event semaphore.
122 */
123DECLINLINE(void) rtR0SemEventBsdRetain(PRTSEMEVENTINTERNAL pThis)
124{
125 uint32_t cRefs = ASMAtomicIncU32(&pThis->cRefs);
126 Assert(cRefs < 100000); NOREF(cRefs);
127}
128
129
130/**
131 * Releases a reference to the event semaphore.
132 *
133 * @param pThis The event semaphore.
134 */
135DECLINLINE(void) rtR0SemEventBsdRelease(PRTSEMEVENTINTERNAL pThis)
136{
137 if (RT_UNLIKELY(ASMAtomicDecU32(&pThis->cRefs) == 0))
138 RTMemFree(pThis);
139}
140
141
142RTDECL(int) RTSemEventDestroy(RTSEMEVENT hEventSem)
143{
144 /*
145 * Validate input.
146 */
147 PRTSEMEVENTINTERNAL pThis = hEventSem;
148 if (pThis == NIL_RTSEMEVENT)
149 return VINF_SUCCESS;
150 AssertMsgReturn(pThis->u32Magic == RTSEMEVENT_MAGIC, ("pThis->u32Magic=%RX32 pThis=%p\n", pThis->u32Magic, pThis), VERR_INVALID_HANDLE);
151 Assert(pThis->cRefs > 0);
152
153 /*
154 * Invalidate it and signal the object just in case.
155 */
156 ASMAtomicWriteU32(&pThis->u32Magic, ~RTSEMEVENT_MAGIC);
157 ASMAtomicWriteU32(&pThis->fState, 0);
158 rtR0SemBsdBroadcast(pThis);
159 rtR0SemEventBsdRelease(pThis);
160 return VINF_SUCCESS;
161}
162
163
164RTDECL(int) RTSemEventSignal(RTSEMEVENT hEventSem)
165{
166 /*
167 * Validate input.
168 */
169 PRTSEMEVENTINTERNAL pThis = (PRTSEMEVENTINTERNAL)hEventSem;
170 AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
171 AssertMsgReturn(pThis->u32Magic == RTSEMEVENT_MAGIC, ("pThis->u32Magic=%RX32 pThis=%p\n", pThis->u32Magic, pThis), VERR_INVALID_HANDLE);
172 rtR0SemEventBsdRetain(pThis);
173
174 /*
175 * Signal the event object.
176 */
177 ASMAtomicWriteU32(&pThis->fState, 1);
178 rtR0SemBsdSignal(pThis);
179 rtR0SemEventBsdRelease(pThis);
180 return VINF_SUCCESS;
181}
182
183/**
184 * Worker for RTSemEventWaitEx and RTSemEventWaitExDebug.
185 *
186 * @returns VBox status code.
187 * @param pThis The event semaphore.
188 * @param fFlags See RTSemEventWaitEx.
189 * @param uTimeout See RTSemEventWaitEx.
190 * @param pSrcPos The source code position of the wait.
191 */
192static int rtR0SemEventWait(PRTSEMEVENTINTERNAL pThis, uint32_t fFlags, uint64_t uTimeout,
193 PCRTLOCKVALSRCPOS pSrcPos)
194{
195 int rc;
196
197 /*
198 * Validate the input.
199 */
200 AssertPtrReturn(pThis, VERR_INVALID_PARAMETER);
201 AssertMsgReturn(pThis->u32Magic == RTSEMEVENT_MAGIC, ("%p u32Magic=%RX32\n", pThis, pThis->u32Magic), VERR_INVALID_PARAMETER);
202 AssertReturn(RTSEMWAIT_FLAGS_ARE_VALID(fFlags), VERR_INVALID_PARAMETER);
203 rtR0SemEventBsdRetain(pThis);
204
205 /*
206 * Try grab the event without setting up the wait.
207 */
208 if (ASMAtomicCmpXchgU32(&pThis->fState, 0, 1))
209 rc = VINF_SUCCESS;
210 else
211 {
212 /*
213 * We have to wait.
214 */
215 RTR0SEMBSDSLEEP Wait;
216 rc = rtR0SemBsdWaitInit(&Wait, fFlags, uTimeout, pThis);
217 if (RT_SUCCESS(rc))
218 {
219 for (;;)
220 {
221 /* The destruction test. */
222 if (RT_UNLIKELY(pThis->u32Magic != RTSEMEVENT_MAGIC))
223 rc = VERR_SEM_DESTROYED;
224 else
225 {
226 rtR0SemBsdWaitPrepare(&Wait);
227
228 /* Check the exit conditions. */
229 if (RT_UNLIKELY(pThis->u32Magic != RTSEMEVENT_MAGIC))
230 rc = VERR_SEM_DESTROYED;
231 else if (ASMAtomicCmpXchgU32(&pThis->fState, 0, 1))
232 rc = VINF_SUCCESS;
233 else if (rtR0SemBsdWaitHasTimedOut(&Wait))
234 rc = VERR_TIMEOUT;
235 else if (rtR0SemBsdWaitWasInterrupted(&Wait))
236 rc = VERR_INTERRUPTED;
237 else
238 {
239 /* Do the wait and then recheck the conditions. */
240 rtR0SemBsdWaitDoIt(&Wait);
241 continue;
242 }
243 }
244 break;
245 }
246
247 rtR0SemBsdWaitDelete(&Wait);
248 }
249 }
250
251 rtR0SemEventBsdRelease(pThis);
252 return rc;
253}
254
255
256RTDECL(int) RTSemEventWaitEx(RTSEMEVENT hEventSem, uint32_t fFlags, uint64_t uTimeout)
257{
258#ifndef RTSEMEVENT_STRICT
259 return rtR0SemEventWait(hEventSem, fFlags, uTimeout, NULL);
260#else
261 RTLOCKVALSRCPOS SrcPos = RTLOCKVALSRCPOS_INIT_NORMAL_API();
262 return rtR0SemEventWait(hEventSem, fFlags, uTimeout, &SrcPos);
263#endif
264}
265RT_EXPORT_SYMBOL(RTSemEventWaitEx);
266
267
268RTDECL(int) RTSemEventWaitExDebug(RTSEMEVENT hEventSem, uint32_t fFlags, uint64_t uTimeout,
269 RTHCUINTPTR uId, RT_SRC_POS_DECL)
270{
271 RTLOCKVALSRCPOS SrcPos = RTLOCKVALSRCPOS_INIT_DEBUG_API();
272 return rtR0SemEventWait(hEventSem, fFlags, uTimeout, &SrcPos);
273}
274RT_EXPORT_SYMBOL(RTSemEventWaitExDebug);
275
276
277RTDECL(uint32_t) RTSemEventGetResolution(void)
278{
279 return 1000000000 / hz;
280}
281
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