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annotate src/thread/win32/win_ce_semaphore.c @ 4170:092c0bc69155 SDL-1.2

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Fixed bug #618 Description From Tim Angus 2008-08-30 12:23:56 (-) [reply] As we all know SDL 1.2 doesn't handle dead keys well since one key press potentially equals two (or more) characters. For example, on many layouts, keying <backquote>,<space> results in <no character>,<backquote><space>. Since the unicode member of the SDL_keysym struct only has room for one character, only one can be returned. On Linux, the first character is returned. On Windows however, unless the exact number of characters generated by the keypress is 1, nothing is returned. The following patch addresses this inconsistency. Updated patch which includes a further fix to the handling of the numpad when numlock is on. This further fix is courtesy Amanieu d'Antras.
author Sam Lantinga <slouken@libsdl.org>
date Mon, 13 Apr 2009 08:42:09 +0000
parents bb6839704ed6
children 782fd950bd46 c121d94672cb
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
1433
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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);
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37
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38 SYNCHHANDLE CreateSemaphoreCE (
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39
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40 LPSECURITY_ATTRIBUTES lpSemaphoreAttributes, /* pointer to security attributes */
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41 LONG lInitialCount, /* initial count */
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42 LONG lMaximumCount, /* maximum count */
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43 LPCTSTR lpName )
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44
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45 /* Semaphore for use with Windows CE that does not support them directly.
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46 Requires a counter, a mutex to protect the counter, and an
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47 autoreset event.
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48
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49 Here are the rules that must always hold between the autoreset event
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50 and the mutex (any violation of these rules by the CE semaphore functions
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51 will, in all likelihood, result in a defect):
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52 1. No thread can set, pulse, or reset the event,
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53 nor can it access any part of the SYNCHHANDLE structure,
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54 without first gaining ownership of the mutex.
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55 BUT, a thread can wait on the event without owning the mutex
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56 (this is clearly necessary or else the event could never be set).
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57 2. The event is in a signaled state if and only if the current semaphore
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58 count ("CurCount") is greater than zero.
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59 3. The semaphore count is always >= 0 and <= the maximum count */
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60
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61 {
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62 SYNCHHANDLE hSynch = NULL, result = NULL;
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63
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64 __try
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65 {
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66 if (lInitialCount > lMaximumCount || lMaximumCount < 0 || lInitialCount < 0)
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67 {
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68 /* Bad parameters */
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69 SetLastError (SYNCH_ERROR);
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70 __leave;
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71 }
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72
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73 hSynch = HeapAlloc (GetProcessHeap(), HEAP_ZERO_MEMORY, SYNCH_HANDLE_SIZE);
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74 if (hSynch == NULL) __leave;
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75
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76 hSynch->MaxCount = lMaximumCount;
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77 hSynch->CurCount = lInitialCount;
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78 hSynch->lpName = lpName;
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79
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80 hSynch->hMutex = CreateMutex (lpSemaphoreAttributes, FALSE, NULL);
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81
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82 WaitForSingleObject (hSynch->hMutex, INFINITE);
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83 /* Create the event. It is initially signaled if and only if the
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84 initial count is > 0 */
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85 hSynch->hEvent = CreateEvent (lpSemaphoreAttributes, FALSE,
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86 lInitialCount > 0, NULL);
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87 ReleaseMutex (hSynch->hMutex);
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88 hSynch->hSemph = NULL;
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89 }
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90 __finally
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91 {
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92 /* Return with the handle, or, if there was any error, return
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93 a null after closing any open handles and freeing any allocated memory. */
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94 result=CleanUp(hSynch, 6 /* An event and a mutex, but no semaphore. */);
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95 }
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96
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97 return result;
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98 }
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99
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100 BOOL ReleaseSemaphoreCE (SYNCHHANDLE hSemCE, LONG cReleaseCount, 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 {
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110 WaitForSingleObject (hSemCE->hMutex, INFINITE);
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111 /* reply only if asked to */
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112 if (lpPreviousCount!=NULL)
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113 *lpPreviousCount = hSemCE->CurCount;
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114 if (hSemCE->CurCount + cReleaseCount > hSemCE->MaxCount || cReleaseCount <= 0)
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115 {
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116 SetLastError (SYNCH_ERROR);
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117 Result = FALSE;
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118 __leave;
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119 }
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120 hSemCE->CurCount += cReleaseCount;
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121
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122 /* Set the autoreset event, releasing exactly one waiting thread, now or
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123 in the future. */
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124
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125 SetEvent (hSemCE->hEvent);
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126 }
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127 __finally
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128 {
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129 ReleaseMutex (hSemCE->hMutex);
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130 }
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131
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132 return Result;
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133 }
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134
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135 DWORD WaitForSemaphoreCE (SYNCHHANDLE hSemCE, DWORD dwMilliseconds)
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136 /* Windows CE semaphore equivalent of WaitForSingleObject. */
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137 {
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138 DWORD WaitResult;
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139
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140 WaitResult = WaitForSingleObject (hSemCE->hMutex, dwMilliseconds);
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141 if (WaitResult != WAIT_OBJECT_0 && WaitResult != WAIT_ABANDONED_0) return WaitResult;
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142 while (hSemCE->CurCount <= 0)
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143 {
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144
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145 /* The count is 0, and the thread must wait on the event (which, by
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146 the rules, is currently reset) for semaphore resources to become
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147 available. First, of course, the mutex must be released so that another
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148 thread will be capable of setting the event. */
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149
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150 ReleaseMutex (hSemCE->hMutex);
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151
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152 /* Wait for the event to be signaled, indicating a semaphore state change.
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153 The event is autoreset and signaled with a SetEvent (not PulseEvent)
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154 so exactly one waiting thread (whether or not there is currently
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155 a waiting thread) is released as a result of the SetEvent. */
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156
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157 WaitResult = WaitForSingleObject (hSemCE->hEvent, dwMilliseconds);
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158 if (WaitResult != WAIT_OBJECT_0) 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) return WaitResult;
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171
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172 }
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173 /* The count is not zero and this thread owns the mutex. */
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174
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175 hSemCE->CurCount--;
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176 /* The event is now unsignaled, BUT, the semaphore count may not be
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177 zero, in which case the event should be signaled again
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178 before releasing the mutex. */
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179
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180 if (hSemCE->CurCount > 0) SetEvent (hSemCE->hEvent);
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181 ReleaseMutex (hSemCE->hMutex);
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182 return WaitResult;
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183 }
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184
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185 BOOL CloseSynchHandle (SYNCHHANDLE hSynch)
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186 /* Close a synchronization handle.
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187 Improvement: Test for a valid handle before dereferencing the handle. */
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188 {
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189 BOOL Result = TRUE;
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190 if (hSynch->hEvent != NULL) Result = Result && CloseHandle (hSynch->hEvent);
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191 if (hSynch->hMutex != NULL) Result = Result && CloseHandle (hSynch->hMutex);
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192 if (hSynch->hSemph != NULL) Result = Result && CloseHandle (hSynch->hSemph);
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193 HeapFree (GetProcessHeap (), 0, hSynch);
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194 return (Result);
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195 }
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196
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197 static SYNCHHANDLE CleanUp (SYNCHHANDLE hSynch, DWORD Flags)
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198 { /* Prepare to return from a create of a synchronization handle.
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199 If there was any failure, free any allocated resources.
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200 "Flags" indicates which Win32 objects are required in the
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201 synchronization handle. */
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202
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203 BOOL ok = TRUE;
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204
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205 if (hSynch == NULL) return NULL;
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206 if ((Flags & 4) == 1 && (hSynch->hEvent == NULL)) ok = FALSE;
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207 if ((Flags & 2) == 1 && (hSynch->hMutex == NULL)) ok = FALSE;
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208 if ((Flags & 1) == 1 && (hSynch->hEvent == NULL)) ok = FALSE;
36
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209 if (!ok)
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210 {
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211 CloseSynchHandle (hSynch);
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212 return NULL;
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213 }
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214 /* Everything worked */
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215 return hSynch;
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216 }