Mercurial > sdl-ios-xcode
annotate src/thread/riscos/SDL_sysmutex.c @ 1551:02e19471a694
Fixed bug #4
[Note: I'm applying this patch since it's a cleaner version of what's already implemented, and supports this controller on older kernels. I'll ask to make sure this doesn't break on the new kernels where it's no longer necessary]
Date: Mon, 21 Mar 2005 09:41:11 -0500
From: Chris Nelson
Subject: SDL Patch
Hey, Ryan.
I submitted the following patch about a year ago. It's just a simple
patch for the linux port, to make multiple joysticks each appear to SDL
as their own device, if they are on the same USB port (specifically,
these guys
<http://www.consoleplus.co.uk/product_info.php?pName=super-joybox-5-quad-joypad-converter>,
which allow 4 Playstation2 controllers to be accessed via a single USB
port). Without this patch, SDL pretty much drops the ball, and reports
that there are 4 joysticks available when less than that number are
plugged in.
My work built upon the work of another person with the same device. When
I submitted the patch to the list, he tested it, but it didn't work for
him, so the patch was never accepted. Maybe about 3 times in the past
year, I've tried to email the guy, to see if he couldn't run my new
version, complete with debug code to diagnose the problem he was having.
He never got back to me.
So, I'm attaching the patch. I wish I knew why it didn't work for him,
but I've been using it for the last year with no problems. Let me know
if you need any more information, or have any ideas as to how I could
test it. I'd like to see it in the tree, but I want to make sure it works.
-Chris
author | Sam Lantinga <slouken@libsdl.org> |
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date | Sun, 19 Mar 2006 06:31:34 +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 /* RISC OS implementations uses pthreads based on linux code */ |
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25 |
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26 #include "SDL_thread.h" |
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27 |
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28 #if SDL_THREADS_DISABLED |
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29 #include "../generic/SDL_sysmutex.c" |
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30 #else |
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31 |
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32 #include <pthread.h> |
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33 |
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34 struct SDL_mutex { |
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35 pthread_mutex_t id; |
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36 #if SDL_THREAD_PTHREAD_NO_RECURSIVE_MUTEX |
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37 int recursive; |
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38 pthread_t owner; |
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39 #endif |
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40 }; |
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41 |
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42 SDL_mutex *SDL_CreateMutex (void) |
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43 { |
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44 SDL_mutex *mutex; |
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45 pthread_mutexattr_t attr; |
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46 |
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47 /* Allocate the structure */ |
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48 mutex = (SDL_mutex *)SDL_calloc(1, sizeof(*mutex)); |
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49 if ( mutex ) { |
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50 pthread_mutexattr_init(&attr); |
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51 #if SDL_THREAD_PTHREAD_NO_RECURSIVE_MUTEX |
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52 /* No extra attributes necessary */ |
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53 #else |
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54 pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE); |
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55 #endif /* SDL_THREAD_PTHREAD_NO_RECURSIVE_MUTEX */ |
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56 if ( pthread_mutex_init(&mutex->id, &attr) != 0 ) { |
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57 SDL_SetError("pthread_mutex_init() failed"); |
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58 SDL_free(mutex); |
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59 mutex = NULL; |
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60 } |
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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 void SDL_DestroyMutex(SDL_mutex *mutex) |
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68 { |
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69 if ( mutex ) { |
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70 pthread_mutex_destroy(&mutex->id); |
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71 SDL_free(mutex); |
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72 } |
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73 } |
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74 |
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75 /* Lock the mutex */ |
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76 int SDL_mutexP(SDL_mutex *mutex) |
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77 { |
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78 int retval; |
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79 #if SDL_THREAD_PTHREAD_NO_RECURSIVE_MUTEX |
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80 pthread_t this_thread; |
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81 #endif |
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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 retval = 0; |
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89 #if SDL_THREAD_PTHREAD_NO_RECURSIVE_MUTEX |
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90 this_thread = pthread_self(); |
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91 if ( mutex->owner == this_thread ) { |
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92 ++mutex->recursive; |
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93 } else { |
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94 /* The order of operations is important. |
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95 We set the locking thread id after we obtain the lock |
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96 so unlocks from other threads will fail. |
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97 */ |
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98 if ( pthread_mutex_lock(&mutex->id) == 0 ) { |
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99 mutex->owner = this_thread; |
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100 mutex->recursive = 0; |
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101 } else { |
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102 SDL_SetError("pthread_mutex_lock() failed"); |
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103 retval = -1; |
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104 } |
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105 } |
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106 #else |
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107 if ( pthread_mutex_lock(&mutex->id) < 0 ) { |
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108 SDL_SetError("pthread_mutex_lock() failed"); |
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109 retval = -1; |
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110 } |
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111 #endif |
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112 return retval; |
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113 } |
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114 |
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115 int SDL_mutexV(SDL_mutex *mutex) |
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116 { |
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117 int retval; |
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118 |
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119 if ( mutex == NULL ) { |
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120 SDL_SetError("Passed a NULL mutex"); |
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121 return -1; |
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122 } |
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123 |
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124 retval = 0; |
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125 #if SDL_THREAD_PTHREAD_NO_RECURSIVE_MUTEX |
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126 /* We can only unlock the mutex if we own it */ |
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127 if ( pthread_self() == mutex->owner ) { |
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128 if ( mutex->recursive ) { |
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129 --mutex->recursive; |
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130 } else { |
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131 /* The order of operations is important. |
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132 First reset the owner so another thread doesn't lock |
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133 the mutex and set the ownership before we reset it, |
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134 then release the lock semaphore. |
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135 */ |
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136 mutex->owner = 0; |
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137 pthread_mutex_unlock(&mutex->id); |
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138 } |
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139 } else { |
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140 SDL_SetError("mutex not owned by this thread"); |
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141 retval = -1; |
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142 } |
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143 |
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144 #else |
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145 if ( pthread_mutex_unlock(&mutex->id) < 0 ) { |
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146 SDL_SetError("pthread_mutex_unlock() failed"); |
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147 retval = -1; |
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148 } |
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149 #endif /* SDL_THREAD_PTHREAD_NO_RECURSIVE_MUTEX */ |
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150 |
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151 return retval; |
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152 } |
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153 #endif |