Mercurial > sdl-ios-xcode
annotate src/thread/generic/SDL_sysmutex.c @ 4085:51486c979189 SDL-1.2
> Hi Ryan,
> I checked the list you linked to, but did not see any reference to whether
> the Win32 window centering bug was fixed... Has that been addressed at all?
> I refer to the bug where, unless one has globally set the
> SDL_WINDOW_CENTERED variable in the OS, only the 1st window that is created
> will be centered. Subsequent calls to SetVideoMode will create a window tha
t
> shares the same upper-left corner location.
I'm working on that now, thanks for reporting it. What I'm doing is if the
width and height are the same, I'm leaving the window position alone, but if
they're different they will respect the positioning environment variables.
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Fri, 20 Jul 2007 03:25:40 +0000 |
| parents | d910939febfa |
| children | 782fd950bd46 c121d94672cb a1b03ba2fcd0 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
|
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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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13 Lesser General Public License for more details. |
| 0 | 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 |
| 0 | 18 |
| 19 Sam Lantinga | |
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20 slouken@libsdl.org |
| 0 | 21 */ |
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22 #include "SDL_config.h" |
| 0 | 23 |
| 24 /* An implementation of mutexes using semaphores */ | |
| 25 | |
| 26 #include "SDL_thread.h" | |
| 27 #include "SDL_systhread_c.h" | |
| 28 | |
| 29 | |
| 30 struct SDL_mutex { | |
| 31 int recursive; | |
| 32 Uint32 owner; | |
| 33 SDL_sem *sem; | |
| 34 }; | |
| 35 | |
| 36 /* Create a mutex */ | |
| 37 SDL_mutex *SDL_CreateMutex(void) | |
| 38 { | |
| 39 SDL_mutex *mutex; | |
| 40 | |
| 41 /* Allocate mutex memory */ | |
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42 mutex = (SDL_mutex *)SDL_malloc(sizeof(*mutex)); |
| 0 | 43 if ( mutex ) { |
| 44 /* Create the mutex semaphore, with initial value 1 */ | |
| 45 mutex->sem = SDL_CreateSemaphore(1); | |
| 46 mutex->recursive = 0; | |
| 47 mutex->owner = 0; | |
| 48 if ( ! mutex->sem ) { | |
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49 SDL_free(mutex); |
| 0 | 50 mutex = NULL; |
| 51 } | |
| 52 } else { | |
| 53 SDL_OutOfMemory(); | |
| 54 } | |
| 55 return mutex; | |
| 56 } | |
| 57 | |
| 58 /* Free the mutex */ | |
| 59 void SDL_DestroyMutex(SDL_mutex *mutex) | |
| 60 { | |
| 61 if ( mutex ) { | |
| 62 if ( mutex->sem ) { | |
| 63 SDL_DestroySemaphore(mutex->sem); | |
| 64 } | |
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65 SDL_free(mutex); |
| 0 | 66 } |
| 67 } | |
| 68 | |
| 69 /* Lock the semaphore */ | |
| 70 int SDL_mutexP(SDL_mutex *mutex) | |
| 71 { | |
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72 #if SDL_THREADS_DISABLED |
| 0 | 73 return 0; |
| 74 #else | |
| 75 Uint32 this_thread; | |
| 76 | |
| 77 if ( mutex == NULL ) { | |
| 78 SDL_SetError("Passed a NULL mutex"); | |
| 79 return -1; | |
| 80 } | |
| 81 | |
| 82 this_thread = SDL_ThreadID(); | |
| 83 if ( mutex->owner == this_thread ) { | |
| 84 ++mutex->recursive; | |
| 85 } else { | |
| 86 /* The order of operations is important. | |
| 87 We set the locking thread id after we obtain the lock | |
| 88 so unlocks from other threads will fail. | |
| 89 */ | |
| 90 SDL_SemWait(mutex->sem); | |
| 91 mutex->owner = this_thread; | |
| 92 mutex->recursive = 0; | |
| 93 } | |
| 94 | |
| 95 return 0; | |
|
1361
19418e4422cb
New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
1358
diff
changeset
|
96 #endif /* SDL_THREADS_DISABLED */ |
| 0 | 97 } |
| 98 | |
| 99 /* Unlock the mutex */ | |
| 100 int SDL_mutexV(SDL_mutex *mutex) | |
| 101 { | |
|
1361
19418e4422cb
New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
1358
diff
changeset
|
102 #if SDL_THREADS_DISABLED |
| 0 | 103 return 0; |
| 104 #else | |
| 105 if ( mutex == NULL ) { | |
| 106 SDL_SetError("Passed a NULL mutex"); | |
| 107 return -1; | |
| 108 } | |
| 109 | |
| 110 /* If we don't own the mutex, we can't unlock it */ | |
| 111 if ( SDL_ThreadID() != mutex->owner ) { | |
| 112 SDL_SetError("mutex not owned by this thread"); | |
| 113 return -1; | |
| 114 } | |
| 115 | |
| 116 if ( mutex->recursive ) { | |
| 117 --mutex->recursive; | |
| 118 } else { | |
| 119 /* The order of operations is important. | |
| 120 First reset the owner so another thread doesn't lock | |
| 121 the mutex and set the ownership before we reset it, | |
| 122 then release the lock semaphore. | |
| 123 */ | |
| 124 mutex->owner = 0; | |
| 125 SDL_SemPost(mutex->sem); | |
| 126 } | |
| 127 return 0; | |
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1361
19418e4422cb
New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
1358
diff
changeset
|
128 #endif /* SDL_THREADS_DISABLED */ |
| 0 | 129 } |