Mercurial > sdl-ios-xcode
annotate src/atomic/SDL_spinlock.c @ 5088:c2539ff054c8
Fixed compiling on Windows Mobile SDK 5.0 with Visual Studio 2008
author | Sam Lantinga <slouken@libsdl.org> |
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date | Mon, 24 Jan 2011 15:46:11 -0800 |
parents | 1e94e68525d5 |
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1 /* |
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2 SDL - Simple DirectMedia Layer |
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3 Copyright (C) 1997-2010 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_stdinc.h" |
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23 |
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24 #include "SDL_atomic.h" |
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25 #include "SDL_timer.h" |
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26 |
5073 | 27 /* Don't do the check for Visual Studio 2005, it's safe here */ |
28 #if defined(_MSC_VER) | |
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29 #ifdef _WIN32_WCE |
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30 #define WIN32_LEAN_AND_MEAN |
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31 #include <windows.h> |
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32 #else |
5073 | 33 #include <intrin.h> |
34 #endif | |
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35 #endif /* _MSC_VER */ |
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36 |
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37 /* This function is where all the magic happens... */ |
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38 SDL_bool |
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39 SDL_AtomicTryLock(SDL_SpinLock *lock) |
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40 { |
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41 #if defined(_MSC_VER) |
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42 SDL_COMPILE_TIME_ASSERT(locksize, sizeof(*lock) == sizeof(long)); |
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43 return (_InterlockedExchange((long*)lock, 1) == 0); |
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44 |
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45 #elif defined(__MACOSX__) |
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46 return OSAtomicCompareAndSwap32Barrier(0, 1, lock); |
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47 |
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48 #elif defined(HAVE_GCC_ATOMICS) || defined(HAVE_GCC_SYNC_LOCK_TEST_AND_SET) |
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49 return (__sync_lock_test_and_set(lock, 1) == 0); |
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50 |
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51 #elif defined(__GNUC__) && defined(__arm__) && defined(__ARM_ARCH_5__) |
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52 int result; |
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53 __asm__ __volatile__ ( |
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54 "swp %0, %1, [%2]\n" |
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55 : "=&r,&r" (result) : "r,0" (1), "r,r" (lock) : "memory"); |
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56 return (result == 0); |
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57 |
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58 #elif defined(__GNUC__) && defined(__arm__) |
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59 int result; |
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60 __asm__ __volatile__ ( |
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61 "ldrex %0, [%2]\nteq %0, #0\nstrexeq %0, %1, [%2]" |
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62 : "=&r" (result) : "r" (1), "r" (lock) : "cc", "memory"); |
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63 return (result == 0); |
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64 |
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65 #else |
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66 /* Need CPU instructions for spinlock here! */ |
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67 __need_spinlock_implementation__ |
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68 #endif |
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69 } |
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70 |
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71 void |
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72 SDL_AtomicLock(SDL_SpinLock *lock) |
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73 { |
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74 /* FIXME: Should we have an eventual timeout? */ |
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75 while (!SDL_AtomicTryLock(lock)) { |
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76 SDL_Delay(0); |
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77 } |
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78 } |
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79 |
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80 void |
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81 SDL_AtomicUnlock(SDL_SpinLock *lock) |
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82 { |
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83 /* Assuming atomic assignment operation and full memory barrier in lock */ |
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84 *lock = 0; |
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85 } |
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86 |
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87 /* vi: set ts=4 sw=4 expandtab: */ |