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annotate src/thread/dc/SDL_sysmutex.c @ 866:0a45995a7fc3

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Date: Tue, 2 Mar 2004 11:34:54 +0100 From: Bartosz Fenski aka fEnIo Subject: outdated entry in INSTALL file I've just found in INSTALL file: If you are cross-compiling from Linux to Win32, you should read the file README.Win32 But you don't shipped this file with SDL. I've found in CVS logs that this file has been deleted and this information is now in FAQ.
author Sam Lantinga <slouken@libsdl.org>
date Tue, 02 Mar 2004 13:01:02 +0000
parents b8d311d90021
children c9b51268668f
rev   line source
509
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1 /*
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2 SDL - Simple DirectMedia Layer
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b8d311d90021 Updated copyright information for 2004 (Happy New Year!)
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3 Copyright (C) 1997-2004 Sam Lantinga
509
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4
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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 Library General Public
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7 License as published by the Free Software Foundation; either
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8 version 2 of the License, or (at your option) any later version.
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9
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Library General Public License for more details.
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14
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15 You should have received a copy of the GNU Library General Public
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16 License along with this library; if not, write to the Free
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17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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18
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19 BERO
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20 bero@geocities.co.jp
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21
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22 based on generic/SDL_sysmutex.c
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23
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24 Sam Lantinga
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25 slouken@libsdl.org
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26 */
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27
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28 #ifdef SAVE_RCSID
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29 static char rcsid =
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30 "@(#) $Id$";
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31 #endif
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32
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33 /* An implementation of mutexes using semaphores */
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34
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35 #include <stdio.h>
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36 #include <stdlib.h>
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37
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38 #include "SDL_error.h"
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39 #include "SDL_thread.h"
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40 #include "SDL_systhread_c.h"
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41
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42 #include <arch/spinlock.h>
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43
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44 struct SDL_mutex {
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45 int recursive;
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46 Uint32 owner;
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47 spinlock_t mutex;
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48 };
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49
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50 /* Create a mutex */
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51 SDL_mutex *SDL_CreateMutex(void)
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52 {
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53 SDL_mutex *mutex;
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54
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55 /* Allocate mutex memory */
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56 mutex = (SDL_mutex *)malloc(sizeof(*mutex));
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57 if ( mutex ) {
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58 spinlock_init(&mutex->mutex);
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59 mutex->recursive = 0;
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60 mutex->owner = 0;
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61 } else {
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62 SDL_OutOfMemory();
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63 }
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64 return mutex;
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65 }
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66
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67 /* Free the mutex */
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68 void SDL_DestroyMutex(SDL_mutex *mutex)
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69 {
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70 if ( mutex ) {
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71 free(mutex);
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72 }
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73 }
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74
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75 /* Lock the semaphore */
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76 int SDL_mutexP(SDL_mutex *mutex)
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77 {
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78 #ifdef DISABLE_THREADS
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79 return 0;
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80 #else
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81 Uint32 this_thread;
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82
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83 if ( mutex == NULL ) {
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84 SDL_SetError("Passed a NULL mutex");
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85 return -1;
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86 }
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87
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88 this_thread = SDL_ThreadID();
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89 if ( mutex->owner == this_thread ) {
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90 ++mutex->recursive;
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91 } else {
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92 /* The order of operations is important.
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93 We set the locking thread id after we obtain the lock
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94 so unlocks from other threads will fail.
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95 */
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96 spinlock_lock(&mutex->mutex);
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97 mutex->owner = this_thread;
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98 mutex->recursive = 0;
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99 }
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100
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101 return 0;
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102 #endif /* DISABLE_THREADS */
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103 }
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104
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105 /* Unlock the mutex */
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106 int SDL_mutexV(SDL_mutex *mutex)
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107 {
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108 #ifdef DISABLE_THREADS
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109 return 0;
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110 #else
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111 if ( mutex == NULL ) {
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112 SDL_SetError("Passed a NULL mutex");
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113 return -1;
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114 }
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115
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116 /* If we don't own the mutex, we can't unlock it */
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117 if ( SDL_ThreadID() != mutex->owner ) {
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118 SDL_SetError("mutex not owned by this thread");
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119 return -1;
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120 }
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121
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122 if ( mutex->recursive ) {
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123 --mutex->recursive;
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124 } else {
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125 /* The order of operations is important.
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126 First reset the owner so another thread doesn't lock
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127 the mutex and set the ownership before we reset it,
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128 then release the lock semaphore.
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129 */
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130 mutex->owner = 0;
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131 spinlock_unlock(&mutex->mutex);
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132 }
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133 return 0;
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134 #endif /* DISABLE_THREADS */
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135 }