1 | /* $Id: semfastmutex-r0drv-os2.cpp 82968 2020-02-04 10:35:17Z vboxsync $ */
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2 | /** @file
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3 | * IPRT - Fast Mutex Semaphores, Ring-0 Driver, OS/2.
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4 | */
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5 |
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6 | /*
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7 | * Contributed by knut st. osmundsen.
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8 | *
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9 | * Copyright (C) 2007-2020 Oracle Corporation
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10 | *
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11 | * This file is part of VirtualBox Open Source Edition (OSE), as
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12 | * available from http://www.virtualbox.org. This file is free software;
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13 | * you can redistribute it and/or modify it under the terms of the GNU
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14 | * General Public License (GPL) as published by the Free Software
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15 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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16 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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17 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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18 | *
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19 | * The contents of this file may alternatively be used under the terms
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20 | * of the Common Development and Distribution License Version 1.0
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21 | * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
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22 | * VirtualBox OSE distribution, in which case the provisions of the
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23 | * CDDL are applicable instead of those of the GPL.
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24 | *
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25 | * You may elect to license modified versions of this file under the
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26 | * terms and conditions of either the GPL or the CDDL or both.
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27 | * --------------------------------------------------------------------
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28 | *
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29 | * This code is based on:
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30 | *
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31 | * Copyright (c) 2007 knut st. osmundsen <[email protected]>
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32 | *
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33 | * Permission is hereby granted, free of charge, to any person
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34 | * obtaining a copy of this software and associated documentation
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35 | * files (the "Software"), to deal in the Software without
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36 | * restriction, including without limitation the rights to use,
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37 | * copy, modify, merge, publish, distribute, sublicense, and/or sell
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38 | * copies of the Software, and to permit persons to whom the
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39 | * Software is furnished to do so, subject to the following
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40 | * conditions:
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41 | *
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42 | * The above copyright notice and this permission notice shall be
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43 | * included in all copies or substantial portions of the Software.
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44 | *
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45 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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46 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
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47 | * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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48 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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49 | * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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50 | * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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51 | * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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52 | * OTHER DEALINGS IN THE SOFTWARE.
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53 | */
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54 |
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55 |
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56 | /*********************************************************************************************************************************
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57 | * Header Files *
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58 | *********************************************************************************************************************************/
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59 | #include "the-os2-kernel.h"
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60 |
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61 | #include <iprt/semaphore.h>
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62 | #include <iprt/errcore.h>
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63 | #include <iprt/alloc.h>
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64 | #include <iprt/assert.h>
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65 | #include <iprt/asm.h>
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66 |
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67 | #include "internal/magics.h"
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68 |
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69 |
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70 | /*********************************************************************************************************************************
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71 | * Structures and Typedefs *
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72 | *********************************************************************************************************************************/
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73 | /**
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74 | * Wrapper for the OS/2 KEE mutex semaphore.
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75 | */
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76 | typedef struct RTSEMFASTMUTEXINTERNAL
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77 | {
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78 | /** Magic value (RTSEMFASTMUTEX_MAGIC). */
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79 | uint32_t u32Magic;
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80 | /** The KEE mutex. */
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81 | MutexLock_t Mtx;
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82 | } RTSEMFASTMUTEXINTERNAL, *PRTSEMFASTMUTEXINTERNAL;
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83 |
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84 |
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85 | RTDECL(int) RTSemFastMutexCreate(PRTSEMFASTMUTEX phFastMtx)
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86 | {
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87 | AssertCompile(sizeof(RTSEMFASTMUTEXINTERNAL) > sizeof(void *));
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88 | AssertPtrReturn(phFastMtx, VERR_INVALID_POINTER);
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89 |
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90 | PRTSEMFASTMUTEXINTERNAL pThis = (PRTSEMFASTMUTEXINTERNAL)RTMemAlloc(sizeof(*pThis));
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91 | if (pThis)
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92 | {
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93 | pThis->u32Magic = RTSEMFASTMUTEX_MAGIC;
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94 | KernAllocMutexLock(&pThis->Mtx);
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95 |
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96 | *phFastMtx = pThis;
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97 | return VINF_SUCCESS;
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98 | }
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99 | return VERR_NO_MEMORY;
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100 | }
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101 |
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102 |
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103 | RTDECL(int) RTSemFastMutexDestroy(RTSEMFASTMUTEX hFastMtx)
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104 | {
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105 | PRTSEMFASTMUTEXINTERNAL pThis = hFastMtx;
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106 | if (pThis == NIL_RTSEMFASTMUTEX)
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107 | return VINF_SUCCESS;
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108 | AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
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109 | AssertMsgReturn(pThis->u32Magic == RTSEMFASTMUTEX_MAGIC, ("%p: u32Magic=%RX32\n", pThis, pThis->u32Magic), VERR_INVALID_HANDLE);
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110 |
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111 | ASMAtomicWriteU32(&pThis->u32Magic, RTSEMFASTMUTEX_MAGIC_DEAD);
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112 | KernFreeMutexLock(&pThis->Mtx);
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113 | RTMemFree(pThis);
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114 |
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115 | return VINF_SUCCESS;
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116 | }
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117 |
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118 |
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119 | RTDECL(int) RTSemFastMutexRequest(RTSEMFASTMUTEX hFastMtx)
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120 | {
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121 | PRTSEMFASTMUTEXINTERNAL pThis = hFastMtx;
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122 | AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
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123 | AssertMsgReturn(pThis->u32Magic == RTSEMFASTMUTEX_MAGIC, ("%p: u32Magic=%RX32\n", pThis, pThis->u32Magic), VERR_INVALID_HANDLE);
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124 |
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125 | KernRequestExclusiveMutex(&pThis->Mtx);
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126 | return VINF_SUCCESS;
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127 | }
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128 |
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129 |
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130 | RTDECL(int) RTSemFastMutexRelease(RTSEMFASTMUTEX hFastMtx)
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131 | {
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132 | PRTSEMFASTMUTEXINTERNAL pThis = hFastMtx;
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133 | AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
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134 | AssertMsgReturn(pThis->u32Magic == RTSEMFASTMUTEX_MAGIC, ("%p: u32Magic=%RX32\n", pThis, pThis->u32Magic), VERR_INVALID_HANDLE);
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135 |
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136 | KernReleaseExclusiveMutex(&pThis->Mtx);
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137 | return VINF_SUCCESS;
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138 | }
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139 |
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