1 | /* $Id: spinlock-r0drv-os2.cpp 8170 2008-04-18 17:52:25Z vboxsync $ */
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2 | /** @file
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3 | * Incredibly Portable Runtime - Spinlocks, 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 | * Copyright (c) 2007 knut st. osmundsen <[email protected]>
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8 | *
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9 | * Permission is hereby granted, free of charge, to any person
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10 | * obtaining a copy of this software and associated documentation
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11 | * files (the "Software"), to deal in the Software without
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12 | * restriction, including without limitation the rights to use,
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13 | * copy, modify, merge, publish, distribute, sublicense, and/or sell
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14 | * copies of the Software, and to permit persons to whom the
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15 | * Software is furnished to do so, subject to the following
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16 | * conditions:
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17 | *
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18 | * The above copyright notice and this permission notice shall be
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19 | * included in all copies or substantial portions of the Software.
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20 | *
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21 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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22 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
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23 | * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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24 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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25 | * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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26 | * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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27 | * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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28 | * OTHER DEALINGS IN THE SOFTWARE.
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29 | */
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30 |
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31 | /*******************************************************************************
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32 | * Header Files *
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33 | *******************************************************************************/
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34 | #include "the-os2-kernel.h"
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35 |
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36 | #include <iprt/spinlock.h>
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37 | #include <iprt/err.h>
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38 | #include <iprt/alloc.h>
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39 | #include <iprt/assert.h>
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40 | #include <iprt/asm.h>
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41 |
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42 | #include "internal/magics.h"
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43 |
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44 |
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45 | /*******************************************************************************
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46 | * Structures and Typedefs *
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47 | *******************************************************************************/
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48 | /**
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49 | * Wrapper for the SpinLock_t type.
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50 | */
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51 | typedef struct RTSPINLOCKINTERNAL
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52 | {
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53 | /** Spinlock magic value (RTSPINLOCK_MAGIC). */
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54 | uint32_t volatile u32Magic;
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55 | /** The OS/2 spinlock structure. */
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56 | SpinLock_t Spinlock;
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57 | } RTSPINLOCKINTERNAL, *PRTSPINLOCKINTERNAL;
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58 |
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59 |
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60 | RTDECL(int) RTSpinlockCreate(PRTSPINLOCK pSpinlock)
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61 | {
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62 | /*
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63 | * Allocate.
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64 | */
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65 | AssertCompile(sizeof(RTSPINLOCKINTERNAL) > sizeof(void *));
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66 | PRTSPINLOCKINTERNAL pSpinlockInt = (PRTSPINLOCKINTERNAL)RTMemAlloc(sizeof(*pSpinlockInt));
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67 | if (!pSpinlockInt)
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68 | return VERR_NO_MEMORY;
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69 |
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70 | /*
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71 | * Initialize & return.
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72 | */
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73 | pSpinlockInt->u32Magic = RTSPINLOCK_MAGIC;
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74 | KernAllocSpinLock(&pSpinlockInt->Spinlock);
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75 | *pSpinlock = pSpinlockInt;
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76 | return VINF_SUCCESS;
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77 | }
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78 |
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79 |
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80 | RTDECL(int) RTSpinlockDestroy(RTSPINLOCK Spinlock)
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81 | {
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82 | /*
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83 | * Validate input.
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84 | */
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85 | PRTSPINLOCKINTERNAL pSpinlockInt = (PRTSPINLOCKINTERNAL)Spinlock;
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86 | if (!pSpinlockInt)
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87 | return VERR_INVALID_PARAMETER;
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88 | AssertMsgReturn(pSpinlockInt->u32Magic == RTSPINLOCK_MAGIC,
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89 | ("Invalid spinlock %p magic=%#x\n", pSpinlockInt, pSpinlockInt->u32Magic),
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90 | VERR_INVALID_PARAMETER);
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91 |
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92 | /*
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93 | * Make the lock invalid and release the memory.
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94 | */
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95 | ASMAtomicIncU32(&pSpinlockInt->u32Magic);
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96 | KernFreeSpinLock(&pSpinlockInt->Spinlock);
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97 | RTMemFree(pSpinlockInt);
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98 | return VINF_SUCCESS;
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99 | }
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100 |
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101 |
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102 | RTDECL(void) RTSpinlockAcquireNoInts(RTSPINLOCK Spinlock, PRTSPINLOCKTMP pTmp)
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103 | {
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104 | PRTSPINLOCKINTERNAL pSpinlockInt = (PRTSPINLOCKINTERNAL)Spinlock;
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105 | AssertPtr(pSpinlockInt);
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106 | Assert(pSpinlockInt->u32Magic == RTSPINLOCK_MAGIC);
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107 |
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108 | KernAcquireSpinLock(&pSpinlockInt->Spinlock);
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109 | NOREF(pTmp);
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110 | }
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111 |
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112 |
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113 | RTDECL(void) RTSpinlockReleaseNoInts(RTSPINLOCK Spinlock, PRTSPINLOCKTMP pTmp)
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114 | {
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115 | PRTSPINLOCKINTERNAL pSpinlockInt = (PRTSPINLOCKINTERNAL)Spinlock;
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116 | AssertPtr(pSpinlockInt);
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117 | Assert(pSpinlockInt->u32Magic == RTSPINLOCK_MAGIC);
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118 |
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119 | KernReleaseSpinLock(&pSpinlockInt->Spinlock);
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120 | NOREF(pTmp);
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121 | }
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122 |
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123 |
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124 | RTDECL(void) RTSpinlockAcquire(RTSPINLOCK Spinlock, PRTSPINLOCKTMP pTmp)
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125 | {
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126 | PRTSPINLOCKINTERNAL pSpinlockInt = (PRTSPINLOCKINTERNAL)Spinlock;
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127 | AssertPtr(pSpinlockInt);
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128 | Assert(pSpinlockInt->u32Magic == RTSPINLOCK_MAGIC);
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129 |
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130 | KernAcquireSpinLock(&pSpinlockInt->Spinlock);
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131 | NOREF(pTmp);
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132 | }
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133 |
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134 |
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135 | RTDECL(void) RTSpinlockRelease(RTSPINLOCK Spinlock, PRTSPINLOCKTMP pTmp)
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136 | {
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137 | PRTSPINLOCKINTERNAL pSpinlockInt = (PRTSPINLOCKINTERNAL)Spinlock;
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138 | AssertPtr(pSpinlockInt);
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139 | Assert(pSpinlockInt->u32Magic == RTSPINLOCK_MAGIC);
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140 |
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141 | KernReleaseSpinLock(&pSpinlockInt->Spinlock);
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142 | NOREF(pTmp);
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143 | }
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144 |
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