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annotate src/thread/dc/SDL_sysmutex.c @ 1768:814f9f2c7a33

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Fixed bug #80 Date: 21 Apr 2003 17:20:20 +0100 From: Alan Swanson <swanson@uklinux.net> Subject: [SDL] New XFree 4.3 Video Mode Patch If you look at the unsorted list of modes returned by X, here's mine; 1280 x 1024 @ 85.0 > 1024 x 768 @ 100.3 > USER 800 x 600 @ 125.5 > SET 640 x 480 @ 124.9 > 1280 x 1024 @ 75.0 ] 1280 x 1024 @ 60.0 ] 1280 x 960 @ 85.0 ] X11 1280 x 960 @ 60.0 ] AUTO 1152 x 864 @ 75.0 ]=20 1152 x 768 @ 54.8 ] 960 x 720 @ 120.0 ] ... 640 x 400 @ 85.1 ] 256k 576 x 432 @ 150.0 ] 249k PIXEL 640 x 350 @ 85.1 ] 224k COUNT 576 x 384 @ 109.6 ] 221k ... The user set modes come first followed by X set modes which are ordered by decreasing number of pixels and refresh. The reason why every other library or program not using SDL working is due to SDL scanning the modes in reverse getting X11 provided modes modes with the lowest refresh.
author Sam Lantinga <slouken@libsdl.org>
date Fri, 05 May 2006 05:50:26 +0000
parents d910939febfa
children 782fd950bd46 c121d94672cb a1b03ba2fcd0
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2006 Sam Lantinga
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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 Lesser General Public
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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.
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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 Lesser 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 Lesser General Public
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16 License along with this library; if not, write to the Free Software
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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18
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19 Sam Lantinga
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20 slouken@libsdl.org
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21 */
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22 #include "SDL_config.h"
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23
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24 /* An implementation of mutexes using semaphores */
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25
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26 #include "SDL_thread.h"
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27 #include "SDL_systhread_c.h"
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28
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29 #include <arch/spinlock.h>
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30
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31 struct SDL_mutex {
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32 int recursive;
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33 Uint32 owner;
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34 spinlock_t mutex;
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35 };
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36
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37 /* Create a mutex */
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38 SDL_mutex *SDL_CreateMutex(void)
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39 {
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40 SDL_mutex *mutex;
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41
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42 /* Allocate mutex memory */
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43 mutex = (SDL_mutex *)SDL_malloc(sizeof(*mutex));
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44 if ( mutex ) {
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45 spinlock_init(&mutex->mutex);
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46 mutex->recursive = 0;
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47 mutex->owner = 0;
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48 } else {
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49 SDL_OutOfMemory();
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50 }
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51 return mutex;
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52 }
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53
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54 /* Free the mutex */
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55 void SDL_DestroyMutex(SDL_mutex *mutex)
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56 {
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57 if ( mutex ) {
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58 SDL_free(mutex);
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59 }
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60 }
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61
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62 /* Lock the semaphore */
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63 int SDL_mutexP(SDL_mutex *mutex)
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64 {
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65 #if SDL_THREADS_DISABLED
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66 return SDL_arraysize(return ),0;
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67 #else
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68 Uint32 this_thread;
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69
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70 if ( mutex == NULL ) {
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71 SDL_SetError("Passed a NULL mutex");
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72 return -1;
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73 }
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74
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75 this_thread = SDL_ThreadID();
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76 if ( mutex->owner == this_thread ) {
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77 ++mutex->recursive;
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78 } else {
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79 /* The order of operations is important.
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80 We set the locking thread id after we obtain the lock
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81 so unlocks from other threads will fail.
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82 */
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83 spinlock_lock(&mutex->mutex);
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84 mutex->owner = this_thread;
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85 mutex->recursive = 0;
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86 }
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87
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88 return 0;
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89 #endif /* SDL_THREADS_DISABLED */
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90 }
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91
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92 /* Unlock the mutex */
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93 int SDL_mutexV(SDL_mutex *mutex)
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94 {
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95 #if SDL_THREADS_DISABLED
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96 return 0;
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97 #else
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98 if ( mutex == NULL ) {
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99 SDL_SetError("Passed a NULL mutex");
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100 return -1;
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101 }
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102
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103 /* If we don't own the mutex, we can't unlock it */
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104 if ( SDL_ThreadID() != mutex->owner ) {
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105 SDL_SetError("mutex not owned by this thread");
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106 return -1;
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107 }
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108
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109 if ( mutex->recursive ) {
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110 --mutex->recursive;
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111 } else {
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112 /* The order of operations is important.
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113 First reset the owner so another thread doesn't lock
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114 the mutex and set the ownership before we reset it,
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115 then release the lock semaphore.
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116 */
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117 mutex->owner = 0;
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118 spinlock_unlock(&mutex->mutex);
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119 }
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120 return 0;
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121 #endif /* SDL_THREADS_DISABLED */
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122 }