Mercurial > sdl-ios-xcode
annotate src/thread/linux/SDL_sysmutex.c @ 1324:42e95163d553
Favor using pthread_mutexattr_settype() on Linux.
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Fri, 03 Feb 2006 06:33:54 +0000 |
| parents | c9b51268668f |
| children | 3692456e7b0f |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
|
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Updated copyright information and removed rcs id lines (problematic in branch merges)
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3 Copyright (C) 1997-2006 Sam Lantinga |
| 0 | 4 |
| 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 |
| 0 | 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. |
| 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 | |
|
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parents:
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13 Lesser General Public License for more details. |
| 0 | 14 |
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Sam Lantinga <slouken@libsdl.org>
parents:
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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
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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
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| 0 | 18 |
| 19 Sam Lantinga | |
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252
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20 slouken@libsdl.org |
| 0 | 21 */ |
| 22 | |
| 23 #ifdef linux | |
| 24 /* Look to see if glibc is available, and if so, what version */ | |
| 25 #include <features.h> | |
| 26 | |
| 27 #if (__GLIBC__ == 2) && (__GLIBC_MINOR__ == 0) | |
| 28 #warning Working around a bug in glibc 2.0 pthreads | |
| 29 #undef SDL_USE_PTHREADS | |
| 30 /* The bug is actually a problem where threads are suspended, but don't | |
| 31 wake up when the thread manager sends them a signal. This is a problem | |
| 32 with thread creation too, but it happens less often. :-/ | |
| 33 We avoid this by using System V IPC for mutexes. | |
| 34 */ | |
| 35 #endif /* glibc 2.0 */ | |
| 36 #endif /* linux */ | |
| 37 | |
| 38 #ifdef SDL_USE_PTHREADS | |
| 39 | |
| 40 #include <stdlib.h> | |
| 41 #include <stdio.h> | |
| 42 #include <pthread.h> | |
| 43 | |
| 44 #include "SDL_error.h" | |
| 45 #include "SDL_thread.h" | |
| 46 | |
| 47 | |
| 48 struct SDL_mutex { | |
| 49 pthread_mutex_t id; | |
| 50 #ifdef PTHREAD_NO_RECURSIVE_MUTEX | |
| 51 int recursive; | |
| 52 pthread_t owner; | |
| 53 #endif | |
| 54 }; | |
| 55 | |
| 56 SDL_mutex *SDL_CreateMutex (void) | |
| 57 { | |
| 58 SDL_mutex *mutex; | |
| 59 pthread_mutexattr_t attr; | |
| 60 | |
| 61 /* Allocate the structure */ | |
| 62 mutex = (SDL_mutex *)calloc(1, sizeof(*mutex)); | |
| 63 if ( mutex ) { | |
| 64 pthread_mutexattr_init(&attr); | |
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42e95163d553
Favor using pthread_mutexattr_settype() on Linux.
Sam Lantinga <slouken@libsdl.org>
parents:
1312
diff
changeset
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65 #if defined(PTHREAD_RECURSIVE_MUTEX) |
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42e95163d553
Favor using pthread_mutexattr_settype() on Linux.
Sam Lantinga <slouken@libsdl.org>
parents:
1312
diff
changeset
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66 pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE); |
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42e95163d553
Favor using pthread_mutexattr_settype() on Linux.
Sam Lantinga <slouken@libsdl.org>
parents:
1312
diff
changeset
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67 #elif defined(PTHREAD_RECURSIVE_MUTEX_NP) |
| 0 | 68 pthread_mutexattr_setkind_np(&attr, PTHREAD_MUTEX_RECURSIVE_NP); |
| 69 #else | |
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Favor using pthread_mutexattr_settype() on Linux.
Sam Lantinga <slouken@libsdl.org>
parents:
1312
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70 /* No extra attributes necessary */ |
|
42e95163d553
Favor using pthread_mutexattr_settype() on Linux.
Sam Lantinga <slouken@libsdl.org>
parents:
1312
diff
changeset
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71 #endif /* PTHREAD_RECURSIVE_MUTEX */ |
| 0 | 72 if ( pthread_mutex_init(&mutex->id, &attr) != 0 ) { |
| 73 SDL_SetError("pthread_mutex_init() failed"); | |
| 74 free(mutex); | |
| 75 mutex = NULL; | |
| 76 } | |
| 77 } else { | |
| 78 SDL_OutOfMemory(); | |
| 79 } | |
| 80 return(mutex); | |
| 81 } | |
| 82 | |
| 83 void SDL_DestroyMutex(SDL_mutex *mutex) | |
| 84 { | |
| 85 if ( mutex ) { | |
| 86 pthread_mutex_destroy(&mutex->id); | |
| 87 free(mutex); | |
| 88 } | |
| 89 } | |
| 90 | |
| 91 /* Lock the mutex */ | |
| 92 int SDL_mutexP(SDL_mutex *mutex) | |
| 93 { | |
| 94 int retval; | |
| 95 #ifdef PTHREAD_NO_RECURSIVE_MUTEX | |
| 96 pthread_t this_thread; | |
| 97 #endif | |
| 98 | |
| 99 if ( mutex == NULL ) { | |
| 100 SDL_SetError("Passed a NULL mutex"); | |
| 101 return -1; | |
| 102 } | |
| 103 | |
| 104 retval = 0; | |
| 105 #ifdef PTHREAD_NO_RECURSIVE_MUTEX | |
| 106 this_thread = pthread_self(); | |
| 107 if ( mutex->owner == this_thread ) { | |
| 108 ++mutex->recursive; | |
| 109 } else { | |
| 110 /* The order of operations is important. | |
| 111 We set the locking thread id after we obtain the lock | |
| 112 so unlocks from other threads will fail. | |
| 113 */ | |
| 114 if ( pthread_mutex_lock(&mutex->id) == 0 ) { | |
| 115 mutex->owner = this_thread; | |
| 116 mutex->recursive = 0; | |
| 117 } else { | |
| 118 SDL_SetError("pthread_mutex_lock() failed"); | |
| 119 retval = -1; | |
| 120 } | |
| 121 } | |
| 122 #else | |
| 123 if ( pthread_mutex_lock(&mutex->id) < 0 ) { | |
| 124 SDL_SetError("pthread_mutex_lock() failed"); | |
| 125 retval = -1; | |
| 126 } | |
| 127 #endif | |
| 128 return retval; | |
| 129 } | |
| 130 | |
| 131 int SDL_mutexV(SDL_mutex *mutex) | |
| 132 { | |
| 133 int retval; | |
| 134 | |
| 135 if ( mutex == NULL ) { | |
| 136 SDL_SetError("Passed a NULL mutex"); | |
| 137 return -1; | |
| 138 } | |
| 139 | |
| 140 retval = 0; | |
| 141 #ifdef PTHREAD_NO_RECURSIVE_MUTEX | |
| 142 /* We can only unlock the mutex if we own it */ | |
| 143 if ( pthread_self() == mutex->owner ) { | |
| 144 if ( mutex->recursive ) { | |
| 145 --mutex->recursive; | |
| 146 } else { | |
| 147 /* The order of operations is important. | |
| 148 First reset the owner so another thread doesn't lock | |
| 149 the mutex and set the ownership before we reset it, | |
| 150 then release the lock semaphore. | |
| 151 */ | |
| 152 mutex->owner = 0; | |
| 153 pthread_mutex_unlock(&mutex->id); | |
| 154 } | |
| 155 } else { | |
| 156 SDL_SetError("mutex not owned by this thread"); | |
| 157 retval = -1; | |
| 158 } | |
| 159 | |
| 160 #else | |
| 161 if ( pthread_mutex_unlock(&mutex->id) < 0 ) { | |
| 162 SDL_SetError("pthread_mutex_unlock() failed"); | |
| 163 retval = -1; | |
| 164 } | |
| 165 #endif /* PTHREAD_NO_RECURSIVE_MUTEX */ | |
| 166 | |
| 167 return retval; | |
| 168 } | |
| 169 | |
| 170 #else /* Use semaphore implementation */ | |
| 171 | |
| 172 #include "generic/SDL_sysmutex.c" | |
| 173 | |
| 174 #endif /* SDL_USE_PTHREADS */ |