annotate src/thread/riscos/SDL_syscond.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 c121d94672cb a1b03ba2fcd0
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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parents: 955
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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 #if SDL_THREADS_DISABLED
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27 #include "../generic/SDL_syscond.c"
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28 #else
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29 #include <sys/time.h>
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30 #include <unistd.h>
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31 #include <pthread.h>
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32
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33 #include "SDL_thread.h"
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34 #include "SDL_sysmutex_c.h"
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35
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36 struct SDL_cond
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37 {
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38 pthread_cond_t cond;
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39 };
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40
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41 /* Create a condition variable */
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42 SDL_cond * SDL_CreateCond(void)
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43 {
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44 SDL_cond *cond;
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45
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46 cond = (SDL_cond *) SDL_malloc(sizeof(SDL_cond));
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47 if ( cond ) {
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48 if ( pthread_cond_init(&cond->cond, NULL) < 0 ) {
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49 SDL_SetError("pthread_cond_init() failed");
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50 SDL_free(cond);
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51 cond = NULL;
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52 }
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53 }
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54 return(cond);
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55 }
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56
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57 /* Destroy a condition variable */
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58 void SDL_DestroyCond(SDL_cond *cond)
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59 {
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60 if ( cond ) {
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61 pthread_cond_destroy(&cond->cond);
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62 SDL_free(cond);
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63 }
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64 }
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65
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66 /* Restart one of the threads that are waiting on the condition variable */
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67 int SDL_CondSignal(SDL_cond *cond)
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68 {
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69 int retval;
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70
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71 if ( ! cond ) {
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72 SDL_SetError("Passed a NULL condition variable");
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73 return -1;
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74 }
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75
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76 retval = 0;
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77 if ( pthread_cond_signal(&cond->cond) != 0 ) {
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78 SDL_SetError("pthread_cond_signal() failed");
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79 retval = -1;
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80 }
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81 return retval;
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82 }
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83
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84 /* Restart all threads that are waiting on the condition variable */
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85 int SDL_CondBroadcast(SDL_cond *cond)
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86 {
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87 int retval;
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88
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89 if ( ! cond ) {
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90 SDL_SetError("Passed a NULL condition variable");
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91 return -1;
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92 }
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93
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94 retval = 0;
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95 if ( pthread_cond_broadcast(&cond->cond) != 0 ) {
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96 SDL_SetError("pthread_cond_broadcast() failed");
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97 retval = -1;
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98 }
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99 return retval;
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100 }
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101
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102 int SDL_CondWaitTimeout(SDL_cond *cond, SDL_mutex *mutex, Uint32 ms)
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103 {
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104 int retval;
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105 struct timeval delta;
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106 struct timespec abstime;
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107
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108 if ( ! cond ) {
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109 SDL_SetError("Passed a NULL condition variable");
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110 return -1;
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111 }
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112
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113 gettimeofday(&delta, NULL);
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114
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115 abstime.tv_sec = delta.tv_sec + (ms/1000);
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116 abstime.tv_nsec = (delta.tv_usec + (ms%1000) * 1000) * 1000;
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117 if ( abstime.tv_nsec > 1000000000 ) {
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118 abstime.tv_sec += 1;
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119 abstime.tv_nsec -= 1000000000;
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120 }
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121
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122 tryagain:
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123 retval = pthread_cond_timedwait(&cond->cond, &mutex->id, &abstime);
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124 switch (retval) {
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125 case EINTR:
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126 goto tryagain;
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127 break;
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Sam Lantinga <slouken@libsdl.org>
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128 case ETIMEDOUT:
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129 retval = SDL_MUTEX_TIMEDOUT;
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130 break;
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131 case 0:
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132 break;
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133 default:
d74fbf56f2f6 Date: Fri, 25 Jun 2004 13:29:15 +0100
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134 SDL_SetError("pthread_cond_timedwait() failed");
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135 retval = -1;
d74fbf56f2f6 Date: Fri, 25 Jun 2004 13:29:15 +0100
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parents:
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136 break;
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Sam Lantinga <slouken@libsdl.org>
parents:
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137 }
d74fbf56f2f6 Date: Fri, 25 Jun 2004 13:29:15 +0100
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138 return retval;
d74fbf56f2f6 Date: Fri, 25 Jun 2004 13:29:15 +0100
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139 }
d74fbf56f2f6 Date: Fri, 25 Jun 2004 13:29:15 +0100
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parents:
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140
d74fbf56f2f6 Date: Fri, 25 Jun 2004 13:29:15 +0100
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141 /* Wait on the condition variable, unlocking the provided mutex.
d74fbf56f2f6 Date: Fri, 25 Jun 2004 13:29:15 +0100
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142 The mutex must be locked before entering this function!
d74fbf56f2f6 Date: Fri, 25 Jun 2004 13:29:15 +0100
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
143 */
d74fbf56f2f6 Date: Fri, 25 Jun 2004 13:29:15 +0100
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diff changeset
144 int SDL_CondWait(SDL_cond *cond, SDL_mutex *mutex)
d74fbf56f2f6 Date: Fri, 25 Jun 2004 13:29:15 +0100
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145 {
d74fbf56f2f6 Date: Fri, 25 Jun 2004 13:29:15 +0100
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parents:
diff changeset
146 int retval;
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parents:
diff changeset
147
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parents:
diff changeset
148 if ( ! cond ) {
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parents:
diff changeset
149 SDL_SetError("Passed a NULL condition variable");
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150 return -1;
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parents:
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151 }
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parents:
diff changeset
152
d74fbf56f2f6 Date: Fri, 25 Jun 2004 13:29:15 +0100
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153 retval = 0;
d74fbf56f2f6 Date: Fri, 25 Jun 2004 13:29:15 +0100
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diff changeset
154 if ( pthread_cond_wait(&cond->cond, &mutex->id) != 0 ) {
d74fbf56f2f6 Date: Fri, 25 Jun 2004 13:29:15 +0100
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parents:
diff changeset
155 SDL_SetError("pthread_cond_wait() failed");
d74fbf56f2f6 Date: Fri, 25 Jun 2004 13:29:15 +0100
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parents:
diff changeset
156 retval = -1;
d74fbf56f2f6 Date: Fri, 25 Jun 2004 13:29:15 +0100
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parents:
diff changeset
157 }
d74fbf56f2f6 Date: Fri, 25 Jun 2004 13:29:15 +0100
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parents:
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158 return retval;
d74fbf56f2f6 Date: Fri, 25 Jun 2004 13:29:15 +0100
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parents:
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159 }
d74fbf56f2f6 Date: Fri, 25 Jun 2004 13:29:15 +0100
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160 #endif