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annotate src/thread/irix/SDL_syssem.c @ 1585:980d2a0dc2a3

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Date: Tue, 4 Mar 2003 15:05:31 -0800 From: "Jim" Subject: [SDL] Frame Buffer patches... Okay I'm new at patch generation - so please tell me if there's a better way I could have done this. Attached are two patch files generated with 'cvs diff -u' SDL-fb-open-lock.patch applies to SDL_fbvideo.c Modifies the open loop to check /dev/fb/0 found on devfs... Modifies the lock code to return failure if the current virtual terminal is not the one opened for frame buffer writing... Lock would hang forever if switched away (ctrl-alt-F1) ... SDL-fb-mousedrv-screensave.patch applies to SDL_fbevents.c Switches default mouse mode based on SDL_MOUSEDRV - currently only accepts PS2 - otherwise default is MS Mouse. When the screen is switched - exisiting code (wrapped in ifdef SAVE_SCREEN_COTENTS) would save the wrong bit of the screen.... ( I run frame buffer 1600x1200, the size I requested was 800x600 - the save would save the top 800 lines (non biased) and restore them... Adding screen->offset fixed that ) However, if that option is not set, then a call to SDL_UpdateRect (full screen) is made. (which may have had it's contents changed since the screen is not entirely locked because of lock-failure patch) Jim [patches slightly tweaked for SDL 1.2.10]
author Sam Lantinga <slouken@libsdl.org>
date Wed, 22 Mar 2006 07:48:22 +0000
parents ad887c988713
children 782fd950bd46 c121d94672cb a1b03ba2fcd0
rev   line source
1361
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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 #include "SDL_thread.h"
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25 #include "SDL_timer.h"
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26
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27
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28 #include <stdio.h>
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29 #include <stdlib.h>
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30 #include <sys/types.h>
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31 #include <sys/ipc.h>
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32 #include <sys/sem.h>
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33 #include <errno.h>
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34
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35 #include "SDL_error.h"
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36 #include "SDL_thread.h"
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37
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38
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39 struct SDL_semaphore {
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40 int id;
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41 };
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42
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43 /* Not defined by many operating systems, use configure to detect */
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44 /*
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45 #if !defined(HAVE_SEMUN)
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46 union semun {
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47 int val;
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48 struct semid_ds *buf;
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49 ushort *array;
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50 };
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51 #endif
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52 */
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53
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54 static struct sembuf op_trywait[2] = {
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55 { 0, -1, (IPC_NOWAIT|SEM_UNDO) } /* Decrement semaphore, no block */
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56 };
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57 static struct sembuf op_wait[2] = {
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58 { 0, -1, SEM_UNDO } /* Decrement semaphore */
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59 };
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60 static struct sembuf op_post[1] = {
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61 { 0, 1, (IPC_NOWAIT|SEM_UNDO) } /* Increment semaphore */
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62 };
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63
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64 /* Create a blockable semaphore */
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65 SDL_sem *SDL_CreateSemaphore(Uint32 initial_value)
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66 {
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67 extern int _creating_thread_lock; /* SDL_threads.c */
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68 SDL_sem *sem;
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69 union semun init;
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70
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71 sem = (SDL_sem *)SDL_malloc(sizeof(*sem));
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72 if ( sem == NULL ) {
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73 SDL_OutOfMemory();
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74 return(NULL);
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75 }
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76 sem->id = semget(IPC_PRIVATE, 1, (0600|IPC_CREAT));
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77 if ( sem->id < 0 ) {
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78 SDL_SetError("Couldn't create semaphore");
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79 SDL_free(sem);
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80 return(NULL);
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81 }
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82 init.val = initial_value; /* Initialize semaphore */
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83 semctl(sem->id, 0, SETVAL, init);
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84 return(sem);
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85 }
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86
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87 void SDL_DestroySemaphore(SDL_sem *sem)
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88 {
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89 if ( sem ) {
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90 #ifdef __IRIX__
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91 semctl(sem->id, 0, IPC_RMID);
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92 #else
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93 union semun dummy;
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94 dummy.val = 0;
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95 semctl(sem->id, 0, IPC_RMID, dummy);
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96 #endif
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97 SDL_free(sem);
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98 }
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99 }
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100
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101 int SDL_SemTryWait(SDL_sem *sem)
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102 {
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103 int retval;
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104
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105 if ( ! sem ) {
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106 SDL_SetError("Passed a NULL semaphore");
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107 return -1;
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108 }
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109
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110 retval = 0;
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111 tryagain:
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112 if ( semop(sem->id, op_trywait, 1) < 0 ) {
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113 if ( errno == EINTR ) {
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114 goto tryagain;
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115 }
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116 retval = SDL_MUTEX_TIMEDOUT;
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117 }
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118 return retval;
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119 }
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120
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121 int SDL_SemWait(SDL_sem *sem)
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122 {
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123 int retval;
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124
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125 if ( ! sem ) {
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126 SDL_SetError("Passed a NULL semaphore");
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127 return -1;
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128 }
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129
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130 retval = 0;
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131 tryagain:
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132 if ( semop(sem->id, op_wait, 1) < 0 ) {
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133 if ( errno == EINTR ) {
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diff changeset
134 goto tryagain;
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
135 }
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
136 SDL_SetError("Semaphore operation error");
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
137 retval = -1;
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
138 }
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
139 return retval;
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
140 }
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
141
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
142 int SDL_SemWaitTimeout(SDL_sem *sem, Uint32 timeout)
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
143 {
19418e4422cb New configure-based build system. Still work in progress, but much improved
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parents:
diff changeset
144 int retval;
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
145
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
146 if ( ! sem ) {
19418e4422cb New configure-based build system. Still work in progress, but much improved
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parents:
diff changeset
147 SDL_SetError("Passed a NULL semaphore");
19418e4422cb New configure-based build system. Still work in progress, but much improved
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parents:
diff changeset
148 return -1;
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
149 }
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
150
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
151 /* Try the easy cases first */
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
152 if ( timeout == 0 ) {
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
153 return SDL_SemTryWait(sem);
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
154 }
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
155 if ( timeout == SDL_MUTEX_MAXWAIT ) {
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
156 return SDL_SemWait(sem);
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
157 }
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
158
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
159 /* Ack! We have to busy wait... */
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
160 timeout += SDL_GetTicks();
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
161 do {
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
162 retval = SDL_SemTryWait(sem);
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
163 if ( retval == 0 ) {
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
164 break;
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
165 }
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
166 SDL_Delay(1);
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
167 } while ( SDL_GetTicks() < timeout );
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
168
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
169 return retval;
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
170 }
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
171
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
172 Uint32 SDL_SemValue(SDL_sem *sem)
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
173 {
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
174 int semval;
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
175 Uint32 value;
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
176
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
177 value = 0;
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
178 if ( sem ) {
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
179 tryagain:
1402
d910939febfa Use consistent identifiers for the various platforms we support.
Sam Lantinga <slouken@libsdl.org>
parents: 1361
diff changeset
180 #ifdef __IRIX__
1361
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
181 semval = semctl(sem->id, 0, GETVAL);
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
182 #else
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
183 {
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
184 union semun arg;
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
185 arg.val = 0;
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
186 semval = semctl(sem->id, 0, GETVAL, arg);
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
187 }
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
188 #endif
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
189 if ( semval < 0 ) {
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
190 if ( errno == EINTR ) {
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
191 goto tryagain;
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
192 }
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
193 } else {
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
194 value = (Uint32)semval;
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
195 }
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
196 }
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
197 return value;
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
198 }
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
199
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
200 int SDL_SemPost(SDL_sem *sem)
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
201 {
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
202 int retval;
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
203
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
204 if ( ! sem ) {
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
205 SDL_SetError("Passed a NULL semaphore");
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
206 return -1;
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
207 }
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
208
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
209 retval = 0;
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
210 tryagain:
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
211 if ( semop(sem->id, op_post, 1) < 0 ) {
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
212 if ( errno == EINTR ) {
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
213 goto tryagain;
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
214 }
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
215 SDL_SetError("Semaphore operation error");
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
216 retval = -1;
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
217 }
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
218 return retval;
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
219 }