annotate src/thread/dc/SDL_syssem.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>
date Sun, 19 Mar 2006 06:31:34 +0000
parents d910939febfa
children 782fd950bd46 536b0704b7d8
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2006 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 semaphores using mutexes and condition variables */
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25
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26 #include "SDL_timer.h"
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27 #include "SDL_thread.h"
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28 #include "SDL_systhread_c.h"
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29
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30
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31 #if SDL_THREADS_DISABLED
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32
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33 SDL_sem *SDL_CreateSemaphore(Uint32 initial_value)
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34 {
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35 SDL_SetError("SDL not configured with thread support");
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36 return (SDL_sem *)0;
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37 }
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38
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39 void SDL_DestroySemaphore(SDL_sem *sem)
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40 {
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41 return;
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42 }
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43
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44 int SDL_SemTryWait(SDL_sem *sem)
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45 {
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46 SDL_SetError("SDL not configured with thread support");
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47 return -1;
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48 }
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49
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50 int SDL_SemWaitTimeout(SDL_sem *sem, Uint32 timeout)
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51 {
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52 SDL_SetError("SDL not configured with thread support");
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53 return -1;
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54 }
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55
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56 int SDL_SemWait(SDL_sem *sem)
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57 {
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58 SDL_SetError("SDL not configured with thread support");
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59 return -1;
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60 }
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61
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62 Uint32 SDL_SemValue(SDL_sem *sem)
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63 {
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64 return 0;
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65 }
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66
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67 int SDL_SemPost(SDL_sem *sem)
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68 {
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69 SDL_SetError("SDL not configured with thread support");
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70 return -1;
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71 }
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72
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73 #else
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74
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75 #include <kos/sem.h>
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76
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77 struct SDL_semaphore
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78 {
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79 semaphore_t sem;
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80 };
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81
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82 SDL_sem *SDL_CreateSemaphore(Uint32 initial_value)
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83 {
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84 return (SDL_sem *)sem_create(initial_value);
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85 }
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86
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87 /* WARNING:
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88 You cannot call this function when another thread is using the semaphore.
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89 */
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90 void SDL_DestroySemaphore(SDL_sem *sem)
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91 {
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92 if ( ! sem ) {
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93 SDL_SetError("Passed a NULL semaphore");
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94 return;
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95 }
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96
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97 sem_destroy(&sem->sem);
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98 }
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99
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100 int SDL_SemTryWait(SDL_sem *sem)
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101 {
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102 int retval;
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103
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104 if ( ! sem ) {
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105 SDL_SetError("Passed a NULL semaphore");
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106 return -1;
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107 }
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108
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109 retval = sem_trywait(&sem->sem);
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110 if (retval==0) return 0;
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111 else return SDL_MUTEX_TIMEDOUT;
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112
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113 return retval;
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114 }
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115
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116 int SDL_SemWaitTimeout(SDL_sem *sem, Uint32 timeout)
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117 {
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118 int retval;
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119
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120 if ( ! sem ) {
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121 SDL_SetError("Passed a NULL semaphore");
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122 return -1;
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123 }
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124
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125 /* A timeout of 0 is an easy case */
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126 if ( timeout == 0 ) {
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127 return SDL_SemTryWait(sem);
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128 }
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129
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130 retval = sem_wait_timed(&sem->sem,timeout);
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131 if (retval==-1) retval= SDL_MUTEX_TIMEDOUT;
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132
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133 return retval;
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134 }
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135
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136 int SDL_SemWait(SDL_sem *sem)
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137 {
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138 if ( ! sem ) {
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139 SDL_SetError("Passed a NULL semaphore");
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140 return -1;
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141 }
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142
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143 sem_wait(&sem->sem);
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144 return 0;
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145 }
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146
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147 Uint32 SDL_SemValue(SDL_sem *sem)
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148 {
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149 if ( ! sem ) {
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150 SDL_SetError("Passed a NULL semaphore");
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151 return -1;
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152 }
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153
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154 return sem_count(&sem->sem);
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155 }
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156
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157 int SDL_SemPost(SDL_sem *sem)
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158 {
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159 if ( ! sem ) {
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160 SDL_SetError("Passed a NULL semaphore");
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161 return -1;
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162 }
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163
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164 sem_signal(&sem->sem);
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165 return 0;
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166 }
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167
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168 #endif /* SDL_THREADS_DISABLED */