Mercurial > sdl-ios-xcode
annotate src/thread/irix/SDL_syssem.c @ 1928:861bc36f0ab3
Fixed crash with multiple windows
author | Sam Lantinga <slouken@libsdl.org> |
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date | Sun, 23 Jul 2006 00:19:12 +0000 |
parents | c121d94672cb |
children | e27bdcc80744 204be4fc2726 |
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 #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 { |
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41 int id; |
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42 }; |
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43 |
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44 /* Not defined by many operating systems, use configure to detect */ |
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45 /* |
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46 #if !defined(HAVE_SEMUN) |
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47 union semun { |
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48 int val; |
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49 struct semid_ds *buf; |
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50 ushort *array; |
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51 }; |
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52 #endif |
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53 */ |
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54 |
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55 static struct sembuf op_trywait[2] = { |
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56 {0, -1, (IPC_NOWAIT | SEM_UNDO)} /* Decrement semaphore, no block */ |
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57 }; |
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58 static struct sembuf op_wait[2] = { |
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59 {0, -1, SEM_UNDO} /* Decrement semaphore */ |
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60 }; |
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61 static struct sembuf op_post[1] = { |
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62 {0, 1, (IPC_NOWAIT | SEM_UNDO)} /* Increment semaphore */ |
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63 }; |
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64 |
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65 /* Create a blockable semaphore */ |
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66 SDL_sem * |
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67 SDL_CreateSemaphore(Uint32 initial_value) |
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68 { |
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69 extern int _creating_thread_lock; /* SDL_threads.c */ |
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70 SDL_sem *sem; |
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71 union semun init; |
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72 |
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73 sem = (SDL_sem *) SDL_malloc(sizeof(*sem)); |
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74 if (sem == NULL) { |
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75 SDL_OutOfMemory(); |
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76 return (NULL); |
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77 } |
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78 sem->id = semget(IPC_PRIVATE, 1, (0600 | IPC_CREAT)); |
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79 if (sem->id < 0) { |
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80 SDL_SetError("Couldn't create semaphore"); |
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81 SDL_free(sem); |
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82 return (NULL); |
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83 } |
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84 init.val = initial_value; /* Initialize semaphore */ |
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85 semctl(sem->id, 0, SETVAL, init); |
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86 return (sem); |
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87 } |
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88 |
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89 void |
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90 SDL_DestroySemaphore(SDL_sem * sem) |
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91 { |
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92 if (sem) { |
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93 #ifdef __IRIX__ |
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94 semctl(sem->id, 0, IPC_RMID); |
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95 #else |
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96 union semun dummy; |
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97 dummy.val = 0; |
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98 semctl(sem->id, 0, IPC_RMID, dummy); |
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99 #endif |
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100 SDL_free(sem); |
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101 } |
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102 } |
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103 |
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104 int |
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105 SDL_SemTryWait(SDL_sem * sem) |
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106 { |
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107 int retval; |
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108 |
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109 if (!sem) { |
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110 SDL_SetError("Passed a NULL semaphore"); |
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111 return -1; |
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112 } |
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113 |
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114 retval = 0; |
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115 tryagain: |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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116 if (semop(sem->id, op_trywait, 1) < 0) { |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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117 if (errno == EINTR) { |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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118 goto tryagain; |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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|
119 } |
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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|
120 retval = SDL_MUTEX_TIMEDOUT; |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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|
121 } |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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122 return retval; |
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|
123 } |
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New configure-based build system. Still work in progress, but much improved
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|
124 |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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125 int |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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126 SDL_SemWait(SDL_sem * sem) |
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|
127 { |
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128 int retval; |
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129 |
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130 if (!sem) { |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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131 SDL_SetError("Passed a NULL semaphore"); |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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132 return -1; |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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133 } |
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|
134 |
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135 retval = 0; |
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New configure-based build system. Still work in progress, but much improved
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136 tryagain: |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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137 if (semop(sem->id, op_wait, 1) < 0) { |
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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|
138 if (errno == EINTR) { |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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139 goto tryagain; |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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140 } |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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|
141 SDL_SetError("Semaphore operation error"); |
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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142 retval = -1; |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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|
143 } |
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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144 return retval; |
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New configure-based build system. Still work in progress, but much improved
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|
145 } |
19418e4422cb
New configure-based build system. Still work in progress, but much improved
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|
146 |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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147 int |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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148 SDL_SemWaitTimeout(SDL_sem * sem, Uint32 timeout) |
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New configure-based build system. Still work in progress, but much improved
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|
149 { |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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150 int retval; |
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151 |
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152 if (!sem) { |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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153 SDL_SetError("Passed a NULL semaphore"); |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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154 return -1; |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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|
155 } |
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New configure-based build system. Still work in progress, but much improved
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|
156 |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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157 /* Try the easy cases first */ |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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|
158 if (timeout == 0) { |
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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|
159 return SDL_SemTryWait(sem); |
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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|
160 } |
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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|
161 if (timeout == SDL_MUTEX_MAXWAIT) { |
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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|
162 return SDL_SemWait(sem); |
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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|
163 } |
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New configure-based build system. Still work in progress, but much improved
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|
164 |
1895
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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|
165 /* Ack! We have to busy wait... */ |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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|
166 timeout += SDL_GetTicks(); |
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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|
167 do { |
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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|
168 retval = SDL_SemTryWait(sem); |
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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|
169 if (retval == 0) { |
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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|
170 break; |
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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|
171 } |
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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|
172 SDL_Delay(1); |
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
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|
173 } |
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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|
174 while (SDL_GetTicks() < timeout); |
1361
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New configure-based build system. Still work in progress, but much improved
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diff
changeset
|
175 |
1895
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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|
176 return retval; |
1361
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New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff
changeset
|
177 } |
19418e4422cb
New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff
changeset
|
178 |
1895
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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|
179 Uint32 |
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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|
180 SDL_SemValue(SDL_sem * sem) |
1361
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New configure-based build system. Still work in progress, but much improved
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parents:
diff
changeset
|
181 { |
1895
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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|
182 int semval; |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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|
183 Uint32 value; |
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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|
184 |
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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|
185 value = 0; |
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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|
186 if (sem) { |
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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|
187 tryagain: |
1402
d910939febfa
Use consistent identifiers for the various platforms we support.
Sam Lantinga <slouken@libsdl.org>
parents:
1361
diff
changeset
|
188 #ifdef __IRIX__ |
1895
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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|
189 semval = semctl(sem->id, 0, GETVAL); |
1361
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New configure-based build system. Still work in progress, but much improved
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diff
changeset
|
190 #else |
1895
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff
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|
191 { |
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
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diff
changeset
|
192 union semun arg; |
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
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diff
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|
193 arg.val = 0; |
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff
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|
194 semval = semctl(sem->id, 0, GETVAL, arg); |
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff
changeset
|
195 } |
1361
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New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
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diff
changeset
|
196 #endif |
1895
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff
changeset
|
197 if (semval < 0) { |
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
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diff
changeset
|
198 if (errno == EINTR) { |
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
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diff
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|
199 goto tryagain; |
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
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diff
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|
200 } |
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
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diff
changeset
|
201 } else { |
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff
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|
202 value = (Uint32) semval; |
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
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diff
changeset
|
203 } |
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
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diff
changeset
|
204 } |
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
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diff
changeset
|
205 return value; |
1361
19418e4422cb
New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff
changeset
|
206 } |
19418e4422cb
New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff
changeset
|
207 |
1895
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
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diff
changeset
|
208 int |
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
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diff
changeset
|
209 SDL_SemPost(SDL_sem * sem) |
1361
19418e4422cb
New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff
changeset
|
210 { |
1895
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
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diff
changeset
|
211 int retval; |
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New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff
changeset
|
212 |
1895
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
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diff
changeset
|
213 if (!sem) { |
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff
changeset
|
214 SDL_SetError("Passed a NULL semaphore"); |
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff
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|
215 return -1; |
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
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diff
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|
216 } |
1361
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New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff
changeset
|
217 |
1895
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff
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|
218 retval = 0; |
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New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff
changeset
|
219 tryagain: |
1895
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff
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|
220 if (semop(sem->id, op_post, 1) < 0) { |
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
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diff
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|
221 if (errno == EINTR) { |
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
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diff
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|
222 goto tryagain; |
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
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diff
changeset
|
223 } |
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
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diff
changeset
|
224 SDL_SetError("Semaphore operation error"); |
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
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diff
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|
225 retval = -1; |
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
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diff
changeset
|
226 } |
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
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diff
changeset
|
227 return retval; |
1361
19418e4422cb
New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff
changeset
|
228 } |
1895
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
1499
diff
changeset
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229 |
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
1499
diff
changeset
|
230 /* vi: set ts=4 sw=4 expandtab: */ |