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並前往http://www.opensource.apple.com/source/Libc/Libc-825.40.1/arm/sys/OSAtomic.h

Copyright (c) 2011 Apple Inc. All rights reserved ...

... 0l)) #if defined(__arm__) #include <arm/arch.h> #define _osatomic_load_exclusive(p, r) \ __asm__ __volatile__( \ "ldrex %[_r], %[_p]" \ : [_r] "=&r" (r) ...

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