Mercurial > sdl-ios-xcode
annotate src/thread/win32/win_ce_semaphore.c @ 1662:782fd950bd46 SDL-1.3
Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
WARNING: None of the video drivers have been updated for the new API yet! The API is still under design and very fluid.
The code is now run through a consistent indent format:
indent -i4 -nut -nsc -br -ce
The headers are being converted to automatically generate doxygen documentation.
author | Sam Lantinga <slouken@libsdl.org> |
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date | Sun, 28 May 2006 13:04:16 +0000 |
parents | bb6839704ed6 |
children | 4da1ee79c9af |
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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 |
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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 |
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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, |
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71 SYNCH_HANDLE_SIZE); |
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72 if (hSynch == NULL) |
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73 __leave; |
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74 |
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75 hSynch->MaxCount = lMaximumCount; |
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76 hSynch->CurCount = lInitialCount; |
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77 hSynch->lpName = lpName; |
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78 |
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79 hSynch->hMutex = CreateMutex (lpSemaphoreAttributes, FALSE, NULL); |
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80 |
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81 WaitForSingleObject (hSynch->hMutex, INFINITE); |
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82 /* Create the event. It is initially signaled if and only if the |
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83 initial count is > 0 */ |
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84 hSynch->hEvent = CreateEvent (lpSemaphoreAttributes, FALSE, |
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85 lInitialCount > 0, NULL); |
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86 ReleaseMutex (hSynch->hMutex); |
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87 hSynch->hSemph = NULL; |
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88 } |
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89 __finally { |
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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 = |
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93 CleanUp (hSynch, |
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94 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 |
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101 ReleaseSemaphoreCE (SYNCHHANDLE hSemCE, LONG cReleaseCount, |
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102 LPLONG lpPreviousCount) |
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103 /* Windows CE equivalent to ReleaseSemaphore. */ |
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104 { |
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105 BOOL Result = TRUE; |
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106 |
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107 /* Gain access to the object to assure that the release count |
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108 would not cause the total count to exceed the maximum. */ |
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109 |
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110 __try { |
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111 WaitForSingleObject (hSemCE->hMutex, INFINITE); |
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112 /* reply only if asked to */ |
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113 if (lpPreviousCount != NULL) |
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114 *lpPreviousCount = hSemCE->CurCount; |
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115 if (hSemCE->CurCount + cReleaseCount > hSemCE->MaxCount |
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116 || cReleaseCount <= 0) { |
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117 SetLastError (SYNCH_ERROR); |
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118 Result = FALSE; |
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119 __leave; |
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120 } |
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121 hSemCE->CurCount += cReleaseCount; |
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122 |
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123 /* Set the autoreset event, releasing exactly one waiting thread, now or |
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124 in the future. */ |
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125 |
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126 SetEvent (hSemCE->hEvent); |
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127 } |
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128 __finally { |
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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 |
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136 WaitForSemaphoreCE (SYNCHHANDLE hSemCE, DWORD dwMilliseconds) |
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137 /* Windows CE semaphore equivalent of WaitForSingleObject. */ |
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138 { |
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139 DWORD WaitResult; |
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140 |
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141 WaitResult = WaitForSingleObject (hSemCE->hMutex, dwMilliseconds); |
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142 if (WaitResult != WAIT_OBJECT_0 && WaitResult != WAIT_ABANDONED_0) |
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143 return WaitResult; |
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144 while (hSemCE->CurCount <= 0) { |
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145 |
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146 /* The count is 0, and the thread must wait on the event (which, by |
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147 the rules, is currently reset) for semaphore resources to become |
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148 available. First, of course, the mutex must be released so that another |
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149 thread will be capable of setting the event. */ |
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150 |
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151 ReleaseMutex (hSemCE->hMutex); |
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152 |
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153 /* Wait for the event to be signaled, indicating a semaphore state change. |
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154 The event is autoreset and signaled with a SetEvent (not PulseEvent) |
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155 so exactly one waiting thread (whether or not there is currently |
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156 a waiting thread) is released as a result of the SetEvent. */ |
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157 |
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158 WaitResult = WaitForSingleObject (hSemCE->hEvent, dwMilliseconds); |
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159 if (WaitResult != WAIT_OBJECT_0) |
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160 return WaitResult; |
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161 |
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162 /* This is where the properties of setting of an autoreset event is critical |
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163 to assure that, even if the semaphore state changes between the |
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164 preceding Wait and the next, and even if NO threads are waiting |
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165 on the event at the time of the SetEvent, at least one thread |
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166 will be released. |
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167 Pulsing a manual reset event would appear to work, but it would have |
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168 a defect which could appear if the semaphore state changed between |
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169 the two waits. */ |
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170 |
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171 WaitResult = WaitForSingleObject (hSemCE->hMutex, dwMilliseconds); |
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172 if (WaitResult != WAIT_OBJECT_0 && WaitResult != WAIT_ABANDONED_0) |
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173 return WaitResult; |
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174 |
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175 } |
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176 /* The count is not zero and this thread owns the mutex. */ |
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177 |
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178 hSemCE->CurCount--; |
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179 /* The event is now unsignaled, BUT, the semaphore count may not be |
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180 zero, in which case the event should be signaled again |
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181 before releasing the mutex. */ |
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182 |
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183 if (hSemCE->CurCount > 0) |
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184 SetEvent (hSemCE->hEvent); |
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185 ReleaseMutex (hSemCE->hMutex); |
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186 return WaitResult; |
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187 } |
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188 |
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189 BOOL |
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190 CloseSynchHandle (SYNCHHANDLE hSynch) |
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191 /* Close a synchronization handle. |
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192 Improvement: Test for a valid handle before dereferencing the handle. */ |
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193 { |
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194 BOOL Result = TRUE; |
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195 if (hSynch->hEvent != NULL) |
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196 Result = Result && CloseHandle (hSynch->hEvent); |
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197 if (hSynch->hMutex != NULL) |
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198 Result = Result && CloseHandle (hSynch->hMutex); |
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199 if (hSynch->hSemph != NULL) |
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200 Result = Result && CloseHandle (hSynch->hSemph); |
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201 HeapFree (GetProcessHeap (), 0, hSynch); |
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202 return (Result); |
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203 } |
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204 |
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205 static SYNCHHANDLE |
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206 CleanUp (SYNCHHANDLE hSynch, DWORD Flags) |
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207 { /* Prepare to return from a create of a synchronization handle. |
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208 If there was any failure, free any allocated resources. |
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209 "Flags" indicates which Win32 objects are required in the |
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210 synchronization handle. */ |
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211 |
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212 BOOL ok = TRUE; |
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213 |
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Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
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214 if (hSynch == NULL) |
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Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
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215 return NULL; |
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Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents:
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216 if ((Flags & 4) == 1 && (hSynch->hEvent == NULL)) |
782fd950bd46
Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
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217 ok = FALSE; |
782fd950bd46
Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents:
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218 if ((Flags & 2) == 1 && (hSynch->hMutex == NULL)) |
782fd950bd46
Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents:
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219 ok = FALSE; |
782fd950bd46
Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents:
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220 if ((Flags & 1) == 1 && (hSynch->hEvent == NULL)) |
782fd950bd46
Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents:
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221 ok = FALSE; |
782fd950bd46
Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents:
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222 if (!ok) { |
782fd950bd46
Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents:
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223 CloseSynchHandle (hSynch); |
782fd950bd46
Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents:
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224 return NULL; |
782fd950bd46
Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents:
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225 } |
782fd950bd46
Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents:
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226 /* Everything worked */ |
782fd950bd46
Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
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227 return hSynch; |
36
13ee9f4834ea
Windows CE patches contributed by Rainer Loritz
Sam Lantinga <slouken@lokigames.com>
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228 } |
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Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents:
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229 |
782fd950bd46
Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents:
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230 /* vi: set ts=4 sw=4 expandtab: */ |