Mercurial > sdl-ios-xcode
annotate src/thread/win32/SDL_syssem.c @ 1525:23a347cfbed8
Fixed bug #38
I'm using SDL 1.2.9 with Visual C++ 7.0 on Windows 2000.
Here's the setup: my game starts in a window, with
SDL_WM_GrabInput(SDL_GRAB_ON) to constrain the cursor to the game window. The
mouse cursor is outside of the window when the game launches, and when the
window appears the cursor is grabbed and placed at the top left corner of the
inside of the game window. At this point, if I click the mouse without moving
it, the SDL_MOUSEBUTTONDOWN event's mouse coordinates are (65535,65535).
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Tue, 14 Mar 2006 06:00:30 +0000 |
| parents | bb6839704ed6 |
| children | 782fd950bd46 c121d94672cb 84882a89ca50 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
|
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Updated copyright information and removed rcs id lines (problematic in branch merges)
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3 Copyright (C) 1997-2006 Sam Lantinga |
| 0 | 4 |
| 5 This library is free software; you can redistribute it and/or | |
|
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6 modify it under the terms of the GNU Lesser General Public |
| 0 | 7 License as published by the Free Software Foundation; either |
|
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8 version 2.1 of the License, or (at your option) any later version. |
| 0 | 9 |
| 10 This library is distributed in the hope that it will be useful, | |
| 11 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
|
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Updated copyright information and removed rcs id lines (problematic in branch merges)
Sam Lantinga <slouken@libsdl.org>
parents:
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13 Lesser General Public License for more details. |
| 0 | 14 |
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parents:
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15 You should have received a copy of the GNU Lesser General Public |
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c9b51268668f
Updated copyright information and removed rcs id lines (problematic in branch merges)
Sam Lantinga <slouken@libsdl.org>
parents:
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diff
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16 License along with this library; if not, write to the Free Software |
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c9b51268668f
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Sam Lantinga <slouken@libsdl.org>
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| 0 | 18 |
| 19 Sam Lantinga | |
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20 slouken@libsdl.org |
| 0 | 21 */ |
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22 #include "SDL_config.h" |
| 0 | 23 |
| 24 /* Semaphore functions using the Win32 API */ | |
| 25 | |
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SDL_windows.h is no longer necessary
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26 #define WIN32_LEAN_AND_MEAN |
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27 #include <windows.h> |
| 0 | 28 |
| 29 #include "SDL_thread.h" | |
| 30 #if defined(_WIN32_WCE) && (_WIN32_WCE < 300) | |
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31 #include "win_ce_semaphore.h" |
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32 #endif |
| 0 | 33 |
| 34 | |
| 35 struct SDL_semaphore { | |
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36 #if defined(_WIN32_WCE) && (_WIN32_WCE < 300) |
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37 SYNCHHANDLE id; |
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38 #else |
| 0 | 39 HANDLE id; |
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40 #endif |
| 0 | 41 Uint32 volatile count; |
| 42 }; | |
| 43 | |
| 44 | |
| 45 /* Create a semaphore */ | |
| 46 SDL_sem *SDL_CreateSemaphore(Uint32 initial_value) | |
| 47 { | |
| 48 SDL_sem *sem; | |
| 49 | |
| 50 /* Allocate sem memory */ | |
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51 sem = (SDL_sem *)SDL_malloc(sizeof(*sem)); |
| 0 | 52 if ( sem ) { |
| 53 /* Create the semaphore, with max value 32K */ | |
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54 #if defined(_WIN32_WCE) && (_WIN32_WCE < 300) |
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55 sem->id = CreateSemaphoreCE(NULL, initial_value, 32*1024, NULL); |
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56 #else |
| 0 | 57 sem->id = CreateSemaphore(NULL, initial_value, 32*1024, NULL); |
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58 #endif |
| 0 | 59 sem->count = initial_value; |
| 60 if ( ! sem->id ) { | |
| 61 SDL_SetError("Couldn't create semaphore"); | |
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62 SDL_free(sem); |
| 0 | 63 sem = NULL; |
| 64 } | |
| 65 } else { | |
| 66 SDL_OutOfMemory(); | |
| 67 } | |
| 68 return(sem); | |
| 69 } | |
| 70 | |
| 71 /* Free the semaphore */ | |
| 72 void SDL_DestroySemaphore(SDL_sem *sem) | |
| 73 { | |
| 74 if ( sem ) { | |
| 75 if ( sem->id ) { | |
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76 #if defined(_WIN32_WCE) && (_WIN32_WCE < 300) |
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77 CloseSynchHandle(sem->id); |
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78 #else |
| 0 | 79 CloseHandle(sem->id); |
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80 #endif |
| 0 | 81 sem->id = 0; |
| 82 } | |
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83 SDL_free(sem); |
| 0 | 84 } |
| 85 } | |
| 86 | |
| 87 int SDL_SemWaitTimeout(SDL_sem *sem, Uint32 timeout) | |
| 88 { | |
| 89 int retval; | |
| 90 DWORD dwMilliseconds; | |
| 91 | |
| 92 if ( ! sem ) { | |
| 93 SDL_SetError("Passed a NULL sem"); | |
| 94 return -1; | |
| 95 } | |
| 96 | |
| 97 if ( timeout == SDL_MUTEX_MAXWAIT ) { | |
| 98 dwMilliseconds = INFINITE; | |
| 99 } else { | |
| 100 dwMilliseconds = (DWORD)timeout; | |
| 101 } | |
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102 #if defined(_WIN32_WCE) && (_WIN32_WCE < 300) |
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103 switch (WaitForSemaphoreCE(sem->id, dwMilliseconds)) { |
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104 #else |
| 0 | 105 switch (WaitForSingleObject(sem->id, dwMilliseconds)) { |
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106 #endif |
| 0 | 107 case WAIT_OBJECT_0: |
| 108 --sem->count; | |
| 109 retval = 0; | |
| 110 break; | |
| 111 case WAIT_TIMEOUT: | |
| 112 retval = SDL_MUTEX_TIMEDOUT; | |
| 113 break; | |
| 114 default: | |
| 115 SDL_SetError("WaitForSingleObject() failed"); | |
| 116 retval = -1; | |
| 117 break; | |
| 118 } | |
| 119 return retval; | |
| 120 } | |
| 121 | |
| 122 int SDL_SemTryWait(SDL_sem *sem) | |
| 123 { | |
| 124 return SDL_SemWaitTimeout(sem, 0); | |
| 125 } | |
| 126 | |
| 127 int SDL_SemWait(SDL_sem *sem) | |
| 128 { | |
| 129 return SDL_SemWaitTimeout(sem, SDL_MUTEX_MAXWAIT); | |
| 130 } | |
| 131 | |
| 132 /* Returns the current count of the semaphore */ | |
| 133 Uint32 SDL_SemValue(SDL_sem *sem) | |
| 134 { | |
| 135 if ( ! sem ) { | |
| 136 SDL_SetError("Passed a NULL sem"); | |
| 137 return 0; | |
| 138 } | |
| 139 return sem->count; | |
| 140 } | |
| 141 | |
| 142 int SDL_SemPost(SDL_sem *sem) | |
| 143 { | |
| 144 if ( ! sem ) { | |
| 145 SDL_SetError("Passed a NULL sem"); | |
| 146 return -1; | |
| 147 } | |
| 148 /* Increase the counter in the first place, because | |
| 149 * after a successful release the semaphore may | |
| 150 * immediately get destroyed by another thread which | |
| 151 * is waiting for this semaphore. | |
| 152 */ | |
| 153 ++sem->count; | |
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154 #if defined(_WIN32_WCE) && (_WIN32_WCE < 300) |
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155 if ( ReleaseSemaphoreCE(sem->id, 1, NULL) == FALSE ) { |
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156 #else |
| 0 | 157 if ( ReleaseSemaphore(sem->id, 1, NULL) == FALSE ) { |
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158 #endif |
| 0 | 159 --sem->count; /* restore */ |
| 160 SDL_SetError("ReleaseSemaphore() failed"); | |
| 161 return -1; | |
| 162 } | |
| 163 return 0; | |
| 164 } |