VirtualBox

source: vbox/trunk/src/VBox/Runtime/r0drv/netbsd/semfastmutex-r0drv-netbsd.c@ 94155

Last change on this file since 94155 was 93115, checked in by vboxsync, 3 years ago

scm --update-copyright-year

  • Property svn:eol-style set to native
  • Property svn:keywords set to Author Date Id Revision
File size: 5.2 KB
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1/* $Id: semfastmutex-r0drv-netbsd.c 93115 2022-01-01 11:31:46Z vboxsync $ */
2/** @file
3 * IPRT - Fast Mutex Semaphores, Ring-0 Driver, NetBSD.
4 */
5
6/*
7 * Contributed by knut st. osmundsen.
8 *
9 * Copyright (C) 2007-2022 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 * Copyright (c) 2007 knut st. osmundsen <bird-src-spam@anduin.net>
30 *
31 * Permission is hereby granted, free of charge, to any person
32 * obtaining a copy of this software and associated documentation
33 * files (the "Software"), to deal in the Software without
34 * restriction, including without limitation the rights to use,
35 * copy, modify, merge, publish, distribute, sublicense, and/or sell
36 * copies of the Software, and to permit persons to whom the
37 * Software is furnished to do so, subject to the following
38 * conditions:
39 *
40 * The above copyright notice and this permission notice shall be
41 * included in all copies or substantial portions of the Software.
42 *
43 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
44 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
45 * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
46 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
47 * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
48 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
49 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
50 * OTHER DEALINGS IN THE SOFTWARE.
51 */
52
53
54/*********************************************************************************************************************************
55* Header Files *
56*********************************************************************************************************************************/
57#include "the-netbsd-kernel.h"
58
59#include <iprt/semaphore.h>
60#include <iprt/errcore.h>
61#include <iprt/alloc.h>
62#include <iprt/assert.h>
63#include <iprt/asm.h>
64
65#include "internal/magics.h"
66
67
68/*********************************************************************************************************************************
69* Structures and Typedefs *
70*********************************************************************************************************************************/
71/**
72 * Wrapper for the NetBSD (sleep) mutex.
73 */
74typedef struct RTSEMFASTMUTEXINTERNAL
75{
76 /** Magic value (RTSEMFASTMUTEX_MAGIC). */
77 uint32_t u32Magic;
78 /** The NetBSD shared/exclusive lock mutex. */
79 krwlock_t Mtx;
80} RTSEMFASTMUTEXINTERNAL, *PRTSEMFASTMUTEXINTERNAL;
81
82
83RTDECL(int) RTSemFastMutexCreate(PRTSEMFASTMUTEX phFastMtx)
84{
85 AssertCompile(sizeof(RTSEMFASTMUTEXINTERNAL) > sizeof(void *));
86 AssertPtrReturn(phFastMtx, VERR_INVALID_POINTER);
87
88 PRTSEMFASTMUTEXINTERNAL pThis = (PRTSEMFASTMUTEXINTERNAL)RTMemAllocZ(sizeof(*pThis));
89 if (pThis)
90 {
91 pThis->u32Magic = RTSEMFASTMUTEX_MAGIC;
92 rw_init(&pThis->Mtx);
93
94 *phFastMtx = pThis;
95 return VINF_SUCCESS;
96 }
97 return VERR_NO_MEMORY;
98}
99
100
101RTDECL(int) RTSemFastMutexDestroy(RTSEMFASTMUTEX hFastMtx)
102{
103 PRTSEMFASTMUTEXINTERNAL pThis = hFastMtx;
104 if (pThis == NIL_RTSEMFASTMUTEX)
105 return VINF_SUCCESS;
106 AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
107 AssertMsgReturn(pThis->u32Magic == RTSEMFASTMUTEX_MAGIC, ("%p: u32Magic=%RX32\n", pThis, pThis->u32Magic), VERR_INVALID_HANDLE);
108
109 ASMAtomicWriteU32(&pThis->u32Magic, RTSEMFASTMUTEX_MAGIC_DEAD);
110 rw_destroy(&pThis->Mtx);
111 RTMemFree(pThis);
112
113 return VINF_SUCCESS;
114}
115
116
117RTDECL(int) RTSemFastMutexRequest(RTSEMFASTMUTEX hFastMtx)
118{
119 PRTSEMFASTMUTEXINTERNAL pThis = hFastMtx;
120 AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
121 AssertMsgReturn(pThis->u32Magic == RTSEMFASTMUTEX_MAGIC, ("%p: u32Magic=%RX32\n", pThis, pThis->u32Magic), VERR_INVALID_HANDLE);
122
123 rw_enter(&pThis->Mtx, RW_WRITER);
124 return VINF_SUCCESS;
125}
126
127
128RTDECL(int) RTSemFastMutexRelease(RTSEMFASTMUTEX hFastMtx)
129{
130 PRTSEMFASTMUTEXINTERNAL pThis = hFastMtx;
131 AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
132 AssertMsgReturn(pThis->u32Magic == RTSEMFASTMUTEX_MAGIC, ("%p: u32Magic=%RX32\n", pThis, pThis->u32Magic), VERR_INVALID_HANDLE);
133
134 rw_exit(&pThis->Mtx);
135 return VINF_SUCCESS;
136}
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