Mercurial > sdl-ios-xcode
annotate src/thread/dc/SDL_sysmutex.c @ 641:df178851293b
Date: 28 Jun 2003 22:42:52 +0100
From: Alan Swanson
Subject: Re: [SDL] New XFree 4.3 Video Mode Patch
I have a wee amendment that moves the qsort in set_best_resolution
to only occur after failing to find an exact match only. This would
make absolutely sure we get a user set mode.
While I've never had any problems for my normal resolutions (1280x1024,
1024x768, 800x600 & 640,480) while closely examining the output from
qsort I've noticed it doesn't seem to sort the modes fully. These is
one definite wrong at 1152x768 and a few that just look wrong to me.
From a program (attached) I made to examine this more easily. X has
sorted its mode list using the same method as ours (plus frequency),
and our user modes get inserted without any other movement.
On the patch I've made I've also changed cmpmodes to sort on vertical
resolution and then horizontal. Ie vertical is now most significant
bit.
author | Sam Lantinga <slouken@libsdl.org> |
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date | Sat, 28 Jun 2003 21:52:26 +0000 |
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children | b8d311d90021 |
rev | line source |
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1 /* |
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2 SDL - Simple DirectMedia Layer |
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3 Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002 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 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, |
dad72daf44b3
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Sam Lantinga <slouken@libsdl.org>
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128 then release the lock semaphore. |
dad72daf44b3
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Sam Lantinga <slouken@libsdl.org>
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129 */ |
dad72daf44b3
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Sam Lantinga <slouken@libsdl.org>
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130 mutex->owner = 0; |
dad72daf44b3
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Sam Lantinga <slouken@libsdl.org>
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131 spinlock_unlock(&mutex->mutex); |
dad72daf44b3
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Sam Lantinga <slouken@libsdl.org>
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132 } |
dad72daf44b3
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Sam Lantinga <slouken@libsdl.org>
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133 return 0; |
dad72daf44b3
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Sam Lantinga <slouken@libsdl.org>
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134 #endif /* DISABLE_THREADS */ |
dad72daf44b3
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Sam Lantinga <slouken@libsdl.org>
parents:
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135 } |