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annotate src/thread/win32/win_ce_semaphore.c @ 571:8e3ce997621c

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Date: Thu, 16 Jan 2003 13:48:31 +0200 From: "Mike Gorchak" Subject: All QNX patches whole patches concerning QNX. Almost all code has been rewritten by Julian and me. Added initial support for hw overlays in QNX and many many others fixes. P.S. This patches has been reviewed by Dave Rempel from QSSL and included in SDL 1.2.5 distribution, which coming on 3rd party CD for newest 6.2.1 version of QNX, which will be available soon.
author Sam Lantinga <slouken@libsdl.org>
date Mon, 20 Jan 2003 01:38:37 +0000
parents 13ee9f4834ea
children 86d0d01290ea
rev   line source
36
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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 #include <windows.h>
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32 #include "win_ce_semaphore.h"
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33
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34 static SYNCHHANDLE CleanUp (SYNCHHANDLE hSynch, DWORD Flags);
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35
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36 SYNCHHANDLE CreateSemaphoreCE (
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37
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38 LPSECURITY_ATTRIBUTES lpSemaphoreAttributes, /* pointer to security attributes */
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39 LONG lInitialCount, /* initial count */
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40 LONG lMaximumCount, /* maximum count */
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41 LPCTSTR lpName )
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42
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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 {
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60 SYNCHHANDLE hSynch = NULL, result = NULL;
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61
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62 __try
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63 {
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64 if (lInitialCount > lMaximumCount || lMaximumCount < 0 || lInitialCount < 0)
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65 {
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66 /* Bad parameters */
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67 SetLastError (SYNCH_ERROR);
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68 __leave;
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69 }
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70
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71 hSynch = HeapAlloc (GetProcessHeap(), HEAP_ZERO_MEMORY, SYNCH_HANDLE_SIZE);
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72 if (hSynch == NULL) __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 {
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90 /* Return with the handle, or, if there was any error, return
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91 a null after closing any open handles and freeing any allocated memory. */
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92 result=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 ReleaseSemaphoreCE (SYNCHHANDLE hSemCE, LONG cReleaseCount, LPLONG lpPreviousCount)
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99 /* Windows CE equivalent to ReleaseSemaphore. */
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100 {
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101 BOOL Result = TRUE;
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102
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103 /* Gain access to the object to assure that the release count
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104 would not cause the total count to exceed the maximum. */
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105
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106 __try
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107 {
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108 WaitForSingleObject (hSemCE->hMutex, INFINITE);
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109 /* reply only if asked to */
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110 if (lpPreviousCount!=NULL)
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111 *lpPreviousCount = hSemCE->CurCount;
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112 if (hSemCE->CurCount + cReleaseCount > hSemCE->MaxCount || cReleaseCount <= 0)
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113 {
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114 SetLastError (SYNCH_ERROR);
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115 Result = FALSE;
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116 __leave;
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117 }
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118 hSemCE->CurCount += cReleaseCount;
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119
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120 /* Set the autoreset event, releasing exactly one waiting thread, now or
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121 in the future. */
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122
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123 SetEvent (hSemCE->hEvent);
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124 }
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125 __finally
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126 {
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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 WaitForSemaphoreCE (SYNCHHANDLE hSemCE, DWORD dwMilliseconds)
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134 /* Windows CE semaphore equivalent of WaitForSingleObject. */
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135 {
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136 DWORD WaitResult;
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137
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138 WaitResult = WaitForSingleObject (hSemCE->hMutex, dwMilliseconds);
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139 if (WaitResult != WAIT_OBJECT_0 && WaitResult != WAIT_ABANDONED_0) return WaitResult;
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140 while (hSemCE->CurCount <= 0)
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141 {
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142
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143 /* The count is 0, and the thread must wait on the event (which, by
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144 the rules, is currently reset) for semaphore resources to become
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145 available. First, of course, the mutex must be released so that another
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146 thread will be capable of setting the event. */
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147
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148 ReleaseMutex (hSemCE->hMutex);
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149
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150 /* Wait for the event to be signaled, indicating a semaphore state change.
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151 The event is autoreset and signaled with a SetEvent (not PulseEvent)
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152 so exactly one waiting thread (whether or not there is currently
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153 a waiting thread) is released as a result of the SetEvent. */
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154
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155 WaitResult = WaitForSingleObject (hSemCE->hEvent, dwMilliseconds);
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156 if (WaitResult != WAIT_OBJECT_0) return WaitResult;
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157
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158 /* This is where the properties of setting of an autoreset event is critical
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159 to assure that, even if the semaphore state changes between the
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160 preceding Wait and the next, and even if NO threads are waiting
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161 on the event at the time of the SetEvent, at least one thread
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162 will be released.
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163 Pulsing a manual reset event would appear to work, but it would have
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164 a defect which could appear if the semaphore state changed between
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165 the two waits. */
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166
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167 WaitResult = WaitForSingleObject (hSemCE->hMutex, dwMilliseconds);
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168 if (WaitResult != WAIT_OBJECT_0 && WaitResult != WAIT_ABANDONED_0) return WaitResult;
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169
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170 }
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171 /* The count is not zero and this thread owns the mutex. */
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172
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173 hSemCE->CurCount--;
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174 /* The event is now unsignaled, BUT, the semaphore count may not be
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175 zero, in which case the event should be signaled again
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176 before releasing the mutex. */
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177
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178 if (hSemCE->CurCount > 0) SetEvent (hSemCE->hEvent);
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179 ReleaseMutex (hSemCE->hMutex);
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180 return WaitResult;
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181 }
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182
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183 BOOL CloseSynchHandle (SYNCHHANDLE hSynch)
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184 /* Close a synchronization handle.
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185 Improvement: Test for a valid handle before dereferencing the handle. */
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186 {
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187 BOOL Result = TRUE;
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188 if (hSynch->hEvent != NULL) Result = Result && CloseHandle (hSynch->hEvent);
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189 if (hSynch->hMutex != NULL) Result = Result && CloseHandle (hSynch->hMutex);
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190 if (hSynch->hSemph != NULL) Result = Result && CloseHandle (hSynch->hSemph);
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191 HeapFree (GetProcessHeap (), 0, hSynch);
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192 return (Result);
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193 }
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194
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195 static SYNCHHANDLE CleanUp (SYNCHHANDLE hSynch, DWORD Flags)
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196 { /* Prepare to return from a create of a synchronization handle.
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197 If there was any failure, free any allocated resources.
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198 "Flags" indicates which Win32 objects are required in the
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199 synchronization handle. */
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200
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201 BOOL ok = TRUE;
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202
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203 if (hSynch == NULL) return NULL;
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204 if (Flags & 4 == 1 && hSynch->hEvent == NULL) ok = FALSE;
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205 if (Flags & 2 == 1 && hSynch->hMutex == NULL) ok = FALSE;
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206 if (Flags & 1 == 1 && hSynch->hEvent == NULL) ok = FALSE;
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207 if (!ok)
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208 {
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209 CloseSynchHandle (hSynch);
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210 return NULL;
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211 }
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212 /* Everything worked */
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213 return hSynch;
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214 }