Mercurial > sdl-ios-xcode
annotate src/thread/generic/SDL_syssem.c @ 4135:cd98d1dc385c SDL-1.2
Damien Carbery fixed bug #542
In SDL 1.2.13 sdl.m4 the AM_PATH_SDL function looks for sdl-config.
It sets the PATH:
PATH="$prefix/bin:$prefix/usr/bin:$PATH"
but does not save the current PATH or restore the current PATH at the end.
This breaks the build on Solaris because we have GNU tools in another dir
(listed at the top of PATH) but non-GNU tools with the same names in
$prefix/bin. Later configure tests finds the non-GNU tools and quits in error
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Thu, 24 Jan 2008 15:50:20 +0000 |
| parents | aee7ea396f59 |
| children | 782fd950bd46 c121d94672cb a1b03ba2fcd0 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
|
1312
c9b51268668f
Updated copyright information and removed rcs id lines (problematic in branch merges)
Sam Lantinga <slouken@libsdl.org>
parents:
769
diff
changeset
|
3 Copyright (C) 1997-2006 Sam Lantinga |
| 0 | 4 |
| 5 This library is free software; you can redistribute it and/or | |
|
1312
c9b51268668f
Updated copyright information and removed rcs id lines (problematic in branch merges)
Sam Lantinga <slouken@libsdl.org>
parents:
769
diff
changeset
|
6 modify it under the terms of the GNU Lesser General Public |
| 0 | 7 License as published by the Free Software Foundation; either |
|
1312
c9b51268668f
Updated copyright information and removed rcs id lines (problematic in branch merges)
Sam Lantinga <slouken@libsdl.org>
parents:
769
diff
changeset
|
8 version 2.1 of the License, or (at your option) any later version. |
| 0 | 9 |
| 10 This library is distributed in the hope that it will be useful, | |
| 11 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
|
1312
c9b51268668f
Updated copyright information and removed rcs id lines (problematic in branch merges)
Sam Lantinga <slouken@libsdl.org>
parents:
769
diff
changeset
|
13 Lesser General Public License for more details. |
| 0 | 14 |
|
1312
c9b51268668f
Updated copyright information and removed rcs id lines (problematic in branch merges)
Sam Lantinga <slouken@libsdl.org>
parents:
769
diff
changeset
|
15 You should have received a copy of the GNU Lesser General Public |
|
c9b51268668f
Updated copyright information and removed rcs id lines (problematic in branch merges)
Sam Lantinga <slouken@libsdl.org>
parents:
769
diff
changeset
|
16 License along with this library; if not, write to the Free Software |
|
c9b51268668f
Updated copyright information and removed rcs id lines (problematic in branch merges)
Sam Lantinga <slouken@libsdl.org>
parents:
769
diff
changeset
|
17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| 0 | 18 |
| 19 Sam Lantinga | |
|
252
e8157fcb3114
Updated the source with the correct e-mail address
Sam Lantinga <slouken@libsdl.org>
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20 slouken@libsdl.org |
| 0 | 21 */ |
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1402
d910939febfa
Use consistent identifiers for the various platforms we support.
Sam Lantinga <slouken@libsdl.org>
parents:
1361
diff
changeset
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22 #include "SDL_config.h" |
| 0 | 23 |
| 24 /* An implementation of semaphores using mutexes and condition variables */ | |
| 25 | |
| 26 #include "SDL_timer.h" | |
| 27 #include "SDL_thread.h" | |
| 28 #include "SDL_systhread_c.h" | |
| 29 | |
| 30 | |
|
1361
19418e4422cb
New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
1358
diff
changeset
|
31 #if SDL_THREADS_DISABLED |
| 0 | 32 |
| 33 SDL_sem *SDL_CreateSemaphore(Uint32 initial_value) | |
| 34 { | |
| 35 SDL_SetError("SDL not configured with thread support"); | |
| 36 return (SDL_sem *)0; | |
| 37 } | |
| 38 | |
| 39 void SDL_DestroySemaphore(SDL_sem *sem) | |
| 40 { | |
| 41 return; | |
| 42 } | |
| 43 | |
| 44 int SDL_SemTryWait(SDL_sem *sem) | |
| 45 { | |
| 46 SDL_SetError("SDL not configured with thread support"); | |
| 47 return -1; | |
| 48 } | |
| 49 | |
| 50 int SDL_SemWaitTimeout(SDL_sem *sem, Uint32 timeout) | |
| 51 { | |
| 52 SDL_SetError("SDL not configured with thread support"); | |
| 53 return -1; | |
| 54 } | |
| 55 | |
| 56 int SDL_SemWait(SDL_sem *sem) | |
| 57 { | |
| 58 SDL_SetError("SDL not configured with thread support"); | |
| 59 return -1; | |
| 60 } | |
| 61 | |
| 62 Uint32 SDL_SemValue(SDL_sem *sem) | |
| 63 { | |
| 64 return 0; | |
| 65 } | |
| 66 | |
| 67 int SDL_SemPost(SDL_sem *sem) | |
| 68 { | |
| 69 SDL_SetError("SDL not configured with thread support"); | |
| 70 return -1; | |
| 71 } | |
| 72 | |
| 73 #else | |
| 74 | |
| 75 struct SDL_semaphore | |
| 76 { | |
| 77 Uint32 count; | |
| 78 Uint32 waiters_count; | |
| 79 SDL_mutex *count_lock; | |
| 80 SDL_cond *count_nonzero; | |
| 81 }; | |
| 82 | |
| 83 SDL_sem *SDL_CreateSemaphore(Uint32 initial_value) | |
| 84 { | |
| 85 SDL_sem *sem; | |
| 86 | |
|
1336
3692456e7b0f
Use SDL_ prefixed versions of C library functions.
Sam Lantinga <slouken@libsdl.org>
parents:
1330
diff
changeset
|
87 sem = (SDL_sem *)SDL_malloc(sizeof(*sem)); |
| 0 | 88 if ( ! sem ) { |
| 89 SDL_OutOfMemory(); | |
| 1627 | 90 return NULL; |
| 0 | 91 } |
| 92 sem->count = initial_value; | |
| 93 sem->waiters_count = 0; | |
| 94 | |
| 95 sem->count_lock = SDL_CreateMutex(); | |
| 96 sem->count_nonzero = SDL_CreateCond(); | |
| 97 if ( ! sem->count_lock || ! sem->count_nonzero ) { | |
| 98 SDL_DestroySemaphore(sem); | |
| 1627 | 99 return NULL; |
| 0 | 100 } |
| 101 | |
| 1627 | 102 return sem; |
| 0 | 103 } |
| 104 | |
| 105 /* WARNING: | |
| 106 You cannot call this function when another thread is using the semaphore. | |
| 107 */ | |
| 108 void SDL_DestroySemaphore(SDL_sem *sem) | |
| 109 { | |
| 110 if ( sem ) { | |
| 111 sem->count = 0xFFFFFFFF; | |
| 112 while ( sem->waiters_count > 0) { | |
| 113 SDL_CondSignal(sem->count_nonzero); | |
| 114 SDL_Delay(10); | |
| 115 } | |
| 116 SDL_DestroyCond(sem->count_nonzero); | |
| 1627 | 117 if ( sem->count_lock ) { |
| 118 SDL_mutexP(sem->count_lock); | |
| 119 SDL_mutexV(sem->count_lock); | |
| 120 SDL_DestroyMutex(sem->count_lock); | |
| 121 } | |
|
1336
3692456e7b0f
Use SDL_ prefixed versions of C library functions.
Sam Lantinga <slouken@libsdl.org>
parents:
1330
diff
changeset
|
122 SDL_free(sem); |
| 0 | 123 } |
| 124 } | |
| 125 | |
| 126 int SDL_SemTryWait(SDL_sem *sem) | |
| 127 { | |
| 128 int retval; | |
| 129 | |
| 130 if ( ! sem ) { | |
| 131 SDL_SetError("Passed a NULL semaphore"); | |
| 132 return -1; | |
| 133 } | |
| 134 | |
| 135 retval = SDL_MUTEX_TIMEDOUT; | |
| 136 SDL_LockMutex(sem->count_lock); | |
| 137 if ( sem->count > 0 ) { | |
| 138 --sem->count; | |
| 139 retval = 0; | |
| 140 } | |
| 141 SDL_UnlockMutex(sem->count_lock); | |
| 142 | |
| 143 return retval; | |
| 144 } | |
| 145 | |
| 146 int SDL_SemWaitTimeout(SDL_sem *sem, Uint32 timeout) | |
| 147 { | |
| 148 int retval; | |
| 149 | |
| 150 if ( ! sem ) { | |
| 151 SDL_SetError("Passed a NULL semaphore"); | |
| 152 return -1; | |
| 153 } | |
| 154 | |
| 155 /* A timeout of 0 is an easy case */ | |
| 156 if ( timeout == 0 ) { | |
| 157 return SDL_SemTryWait(sem); | |
| 158 } | |
| 159 | |
| 160 SDL_LockMutex(sem->count_lock); | |
| 161 ++sem->waiters_count; | |
| 162 retval = 0; | |
| 163 while ( (sem->count == 0) && (retval != SDL_MUTEX_TIMEDOUT) ) { | |
| 164 retval = SDL_CondWaitTimeout(sem->count_nonzero, | |
| 165 sem->count_lock, timeout); | |
| 166 } | |
| 167 --sem->waiters_count; | |
| 168 --sem->count; | |
| 169 SDL_UnlockMutex(sem->count_lock); | |
| 170 | |
| 171 return retval; | |
| 172 } | |
| 173 | |
| 174 int SDL_SemWait(SDL_sem *sem) | |
| 175 { | |
| 176 return SDL_SemWaitTimeout(sem, SDL_MUTEX_MAXWAIT); | |
| 177 } | |
| 178 | |
| 179 Uint32 SDL_SemValue(SDL_sem *sem) | |
| 180 { | |
| 181 Uint32 value; | |
| 182 | |
| 183 value = 0; | |
| 184 if ( sem ) { | |
| 185 SDL_LockMutex(sem->count_lock); | |
| 186 value = sem->count; | |
| 187 SDL_UnlockMutex(sem->count_lock); | |
| 188 } | |
| 189 return value; | |
| 190 } | |
| 191 | |
| 192 int SDL_SemPost(SDL_sem *sem) | |
| 193 { | |
| 194 if ( ! sem ) { | |
| 195 SDL_SetError("Passed a NULL semaphore"); | |
| 196 return -1; | |
| 197 } | |
| 198 | |
| 199 SDL_LockMutex(sem->count_lock); | |
| 200 if ( sem->waiters_count > 0 ) { | |
| 201 SDL_CondSignal(sem->count_nonzero); | |
| 202 } | |
| 203 ++sem->count; | |
| 204 SDL_UnlockMutex(sem->count_lock); | |
| 205 | |
| 206 return 0; | |
| 207 } | |
| 208 | |
|
1361
19418e4422cb
New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
1358
diff
changeset
|
209 #endif /* SDL_THREADS_DISABLED */ |