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annotate src/thread/win32/win_ce_semaphore.c @ 2334:80ceefc00ada gsoc2008_iphone

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author Holmes Futrell <hfutrell@umail.ucsb.edu>
date Fri, 11 Jul 2008 00:21:45 +0000
parents c121d94672cb
children
rev   line source
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1 /* win_ce_semaphore.c
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2
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3 Copyright (c) 1998, Johnson M. Hart
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4 (with corrections 2001 by Rainer Loritz)
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5 Permission is granted for any and all use providing that this
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6 copyright is properly acknowledged.
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7 There are no assurances of suitability for any use whatsoever.
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8
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9 WINDOWS CE: There is a collection of Windows CE functions to simulate
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10 semaphores using only a mutex and an event. As Windows CE events cannot
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11 be named, these simulated semaphores cannot be named either.
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12
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13 Implementation notes:
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14 1. All required internal data structures are allocated on the process's heap.
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15 2. Where appropriate, a new error code is returned (see the header
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16 file), or, if the error is a Win32 error, that code is unchanged.
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17 3. Notice the new handle type "SYNCHHANDLE" that has handles, counters,
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18 and other information. This structure will grow as new objects are added
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19 to this set; some members are specific to only one or two of the objects.
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20 4. Mutexes are used for critical sections. These could be replaced with
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21 CRITICAL_SECTION objects but then this would give up the time out
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22 capability.
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23 5. The implementation shows several interesting aspects of synchronization, some
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24 of which are specific to Win32 and some of which are general. These are pointed
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25 out in the comments as appropriate.
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26 6. The wait function emulates WaitForSingleObject only. An emulation of
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27 WaitForMultipleObjects is much harder to implement outside the kernel,
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28 and it is not clear how to handle a mixture of WCE semaphores and normal
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29 events and mutexes. */
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30
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31 #define WIN32_LEAN_AND_MEAN
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32 #include <windows.h>
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33
36
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34 #include "win_ce_semaphore.h"
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35
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36 static SYNCHHANDLE CleanUp(SYNCHHANDLE hSynch, DWORD Flags);
36
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37
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38 SYNCHHANDLE
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39 CreateSemaphoreCE(LPSECURITY_ATTRIBUTES lpSemaphoreAttributes, /* pointer to security attributes */
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40 LONG lInitialCount, /* initial count */
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41 LONG lMaximumCount, /* maximum count */
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42 LPCTSTR lpName)
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43 /* Semaphore for use with Windows CE that does not support them directly.
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44 Requires a counter, a mutex to protect the counter, and an
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45 autoreset event.
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46
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47 Here are the rules that must always hold between the autoreset event
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48 and the mutex (any violation of these rules by the CE semaphore functions
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49 will, in all likelihood, result in a defect):
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50 1. No thread can set, pulse, or reset the event,
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51 nor can it access any part of the SYNCHHANDLE structure,
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52 without first gaining ownership of the mutex.
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53 BUT, a thread can wait on the event without owning the mutex
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54 (this is clearly necessary or else the event could never be set).
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55 2. The event is in a signaled state if and only if the current semaphore
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56 count ("CurCount") is greater than zero.
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57 3. The semaphore count is always >= 0 and <= the maximum count */
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58 {
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59 SYNCHHANDLE hSynch = NULL, result = NULL;
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60
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61 __try {
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62 if (lInitialCount > lMaximumCount || lMaximumCount < 0
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63 || lInitialCount < 0) {
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64 /* Bad parameters */
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65 SetLastError(SYNCH_ERROR);
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66 __leave;
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67 }
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68
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69 hSynch =
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70 HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, SYNCH_HANDLE_SIZE);
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71 if (hSynch == NULL)
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72 __leave;
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73
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74 hSynch->MaxCount = lMaximumCount;
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75 hSynch->CurCount = lInitialCount;
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76 hSynch->lpName = lpName;
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77
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78 hSynch->hMutex = CreateMutex(lpSemaphoreAttributes, FALSE, NULL);
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79
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80 WaitForSingleObject(hSynch->hMutex, INFINITE);
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81 /* Create the event. It is initially signaled if and only if the
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82 initial count is > 0 */
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83 hSynch->hEvent = CreateEvent(lpSemaphoreAttributes, FALSE,
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84 lInitialCount > 0, NULL);
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85 ReleaseMutex(hSynch->hMutex);
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86 hSynch->hSemph = NULL;
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87 }
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88 __finally {
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89 /* Return with the handle, or, if there was any error, return
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90 a null after closing any open handles and freeing any allocated memory. */
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91 result =
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92 CleanUp(hSynch, 6 /* An event and a mutex, but no semaphore. */ );
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93 }
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94
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95 return result;
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96 }
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97
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98 BOOL
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99 ReleaseSemaphoreCE(SYNCHHANDLE hSemCE, LONG cReleaseCount,
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100 LPLONG lpPreviousCount)
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101 /* Windows CE equivalent to ReleaseSemaphore. */
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102 {
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103 BOOL Result = TRUE;
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104
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105 /* Gain access to the object to assure that the release count
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106 would not cause the total count to exceed the maximum. */
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107
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108 __try {
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109 WaitForSingleObject(hSemCE->hMutex, INFINITE);
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110 /* reply only if asked to */
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111 if (lpPreviousCount != NULL)
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112 *lpPreviousCount = hSemCE->CurCount;
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113 if (hSemCE->CurCount + cReleaseCount > hSemCE->MaxCount
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114 || cReleaseCount <= 0) {
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115 SetLastError(SYNCH_ERROR);
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116 Result = FALSE;
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117 __leave;
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118 }
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119 hSemCE->CurCount += cReleaseCount;
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120
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121 /* Set the autoreset event, releasing exactly one waiting thread, now or
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122 in the future. */
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123
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124 SetEvent(hSemCE->hEvent);
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125 }
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126 __finally {
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127 ReleaseMutex(hSemCE->hMutex);
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128 }
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129
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130 return Result;
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131 }
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132
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133 DWORD
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134 WaitForSemaphoreCE(SYNCHHANDLE hSemCE, DWORD dwMilliseconds)
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135 /* Windows CE semaphore equivalent of WaitForSingleObject. */
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136 {
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137 DWORD WaitResult;
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138
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139 WaitResult = WaitForSingleObject(hSemCE->hMutex, dwMilliseconds);
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140 if (WaitResult != WAIT_OBJECT_0 && WaitResult != WAIT_ABANDONED_0)
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141 return WaitResult;
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142 while (hSemCE->CurCount <= 0) {
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143
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144 /* The count is 0, and the thread must wait on the event (which, by
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145 the rules, is currently reset) for semaphore resources to become
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146 available. First, of course, the mutex must be released so that another
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147 thread will be capable of setting the event. */
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148
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149 ReleaseMutex(hSemCE->hMutex);
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150
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151 /* Wait for the event to be signaled, indicating a semaphore state change.
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152 The event is autoreset and signaled with a SetEvent (not PulseEvent)
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153 so exactly one waiting thread (whether or not there is currently
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154 a waiting thread) is released as a result of the SetEvent. */
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155
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156 WaitResult = WaitForSingleObject(hSemCE->hEvent, dwMilliseconds);
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157 if (WaitResult != WAIT_OBJECT_0)
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158 return WaitResult;
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159
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160 /* This is where the properties of setting of an autoreset event is critical
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161 to assure that, even if the semaphore state changes between the
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162 preceding Wait and the next, and even if NO threads are waiting
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163 on the event at the time of the SetEvent, at least one thread
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164 will be released.
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165 Pulsing a manual reset event would appear to work, but it would have
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166 a defect which could appear if the semaphore state changed between
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167 the two waits. */
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168
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169 WaitResult = WaitForSingleObject(hSemCE->hMutex, dwMilliseconds);
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170 if (WaitResult != WAIT_OBJECT_0 && WaitResult != WAIT_ABANDONED_0)
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171 return WaitResult;
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172
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173 }
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174 /* The count is not zero and this thread owns the mutex. */
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175
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176 hSemCE->CurCount--;
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177 /* The event is now unsignaled, BUT, the semaphore count may not be
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178 zero, in which case the event should be signaled again
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179 before releasing the mutex. */
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180
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181 if (hSemCE->CurCount > 0)
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182 SetEvent(hSemCE->hEvent);
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183 ReleaseMutex(hSemCE->hMutex);
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184 return WaitResult;
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185 }
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186
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187 BOOL
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188 CloseSynchHandle(SYNCHHANDLE hSynch)
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189 /* Close a synchronization handle.
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190 Improvement: Test for a valid handle before dereferencing the handle. */
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191 {
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192 BOOL Result = TRUE;
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193 if (hSynch->hEvent != NULL)
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194 Result = Result && CloseHandle(hSynch->hEvent);
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195 if (hSynch->hMutex != NULL)
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196 Result = Result && CloseHandle(hSynch->hMutex);
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197 if (hSynch->hSemph != NULL)
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198 Result = Result && CloseHandle(hSynch->hSemph);
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199 HeapFree(GetProcessHeap(), 0, hSynch);
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200 return (Result);
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201 }
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202
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203 static SYNCHHANDLE
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204 CleanUp(SYNCHHANDLE hSynch, DWORD Flags)
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205 { /* Prepare to return from a create of a synchronization handle.
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206 If there was any failure, free any allocated resources.
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207 "Flags" indicates which Win32 objects are required in the
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208 synchronization handle. */
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209
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210 BOOL ok = TRUE;
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211
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212 if (hSynch == NULL)
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213 return NULL;
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214 if ((Flags & 4) == 1 && (hSynch->hEvent == NULL))
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215 ok = FALSE;
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216 if ((Flags & 2) == 1 && (hSynch->hMutex == NULL))
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217 ok = FALSE;
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218 if ((Flags & 1) == 1 && (hSynch->hEvent == NULL))
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219 ok = FALSE;
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220 if (!ok) {
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221 CloseSynchHandle(hSynch);
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222 return NULL;
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223 }
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224 /* Everything worked */
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225 return hSynch;
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226 }
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227
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228 /* vi: set ts=4 sw=4 expandtab: */