ignore got it
On Mon, Aug 2, 2010 at 6:55 PM, mm w <0xcafefeed@xxxxxxxxx> wrote:
> gcc -v
> Using built-in specs.
> Target: i686-apple-darwin10
> Configured with: /var/tmp/gcc/gcc-5659~1/src/configure
> --disable-checking --enable-werror --prefix=/usr --mandir=/share/man
> --enable-languages=c,objc,c++,obj-c++
> --program-transform-name=/^[cg][^.-]*$/s/$/-4.2/
> --with-slibdir=/usr/lib --build=i686-apple-darwin10
> --program-prefix=i686-apple-darwin10- --host=x86_64-apple-darwin10
> --target=i686-apple-darwin10 --with-gxx-include-dir=/include/c++/4.2.1
> Thread model: posix
> gcc version 4.2.1 (Apple Inc. build 5659)
>
>
> -- BEGIN header OSAtomicLock.h
>
> #ifndef OSATOMICLOCK_H
> #define OSATOMICLOCK_H
>
> #if !defined(OS_INLINE)
> #if defined(__GNUC__) && (__GNUC__ == 4) && !defined(DEBUG)
> #define OS_INLINE static __inline__ __attribute__((always_inline))
> #elif defined(__GNUC__)
> #define OS_INLINE static __inline__
> #elif defined(__cplusplus)
> #define OS_INLINE static inline
> #elif defined(_MSC_VER)
> #define OS_INLINE static __inline
> #elif defined(__WIN32__)
> #define OS_INLINE static __inline__
> #endif
> #endif
>
> #if defined(__WIN32__)
> typedef __int32 OSAtomicLockLock;
> #define OSAtomicLockInit 0
> D_INLINE void __OSAtomicLockLock(volatile OSAtomicLock *LOCK) {
> while (InterlockedCompareExchange((LONG volatile *)LOCK, ~0, 0) != 0) {
> Sleep(0);
> }
> }
> D_INLINE void __OSAtomicLockUnlock(volatile OSAtomicLock *LOCK) {
> MemoryBarrier();
> *LOCK = 0;
> }
> #elif defined(__APPLE__)
> #include <libkern/OSAtomic.h>
> typedef OSSpinLock OSAtomicLock;
> #define OSAtomicLockInit OS_SPINLOCK_INIT
> #define __OSAtomicLockLock(LOCK) ({ \
> OSAtomicLock *lck_p = (LOCK); \
> OSAtomicLock lck_v = *lck_p; \
> if (0 != lck_v && ~0 != lck_v && (uintptr_t)lck_p != (uintptr_t)lck_v) { } \
> OSSpinLockLock(lck_p); \
> })
> #define __OSAtomicLockUnlock(LOCK) ({ \
> OSAtomicLock *lck_p = (LOCK); \
> OSAtomicLock lck_v = *lck_p; \
> if (~0 != lck_v && (uintptr_t)lck_p != (uintptr_t)lck_v) { } \
> OSSpinLockUnlock(lck_p); \
> })
> #else // means posix
> #define _MULTI_THREADED
> #include <pthread.h>
> #if defined(__linux__)
> #define OSAtomicLockInit PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP
> #else
> #define OSAtomicLockInit PTHREAD_MUTEX_INITIALIZER
> #endif
> typedef pthread_mutex_t OSAtomicLock;
> #define __OSAtomicLockLock(LOCK) ({ \
> OSAtomicLock *lck_p = (LOCK); \
> pthread_mutex_lock(lck_p); \
> })
> #define __OSAtomicLockUnlock(LOCK) ({ \
> OSAtomicLock *lck_p = (LOCK); \
> pthread_mutex_unlock(lck_p); \
> })
> #endif
>
> #define OSAtomicLockInitialize(LOCK) (LOCK = OSAtomicLockInit)
> #define OSAtomicLockLock(LOCK) __OSAtomicLockLock(LOCK)
> #define OSAtomicLockUnlock(LOCK) __OSAtomicLockUnlock(LOCK)
>
> #define OSAtomicAutoLock(LOCK, BLOCK) \
> OSAtomicLockLock(LOCK); \
> BLOCK \
> OSAtomicLockUnlock(LOCK);
>
> #endif // OSATOMICLOCK_H
>
> /* HOWTO
> static OSAtomicLock __myGlobalLock = OSAtomicLockInit;
> void mylocalfunc()
> {
> OSAtomicLockLock(&__myGlobalLock);
> //do stuff
> OSAtomicLockUnlock(&__myGlobalLock);
> }
> */
>
> -- END header OSAtomicLock.h
>
>
> -- BEGIN test1.c
>
> #include <stdio.h>
> #include "OSAtomicLock.h"
>
> static OSAtomicLock __myGlobalLock = OSAtomicLockInit;
>
> int main (int argc, const char** argv)
> {
> OSAtomicLockLock(&__myGlobalLock);
> fprintf(stderr,"hello\n");
> OSAtomicLockLock(&__myGlobalLock);
> return 0;
> }
>
> -- END test1.c
>
> -- BEGIN test2.c
>
> #include <stdio.h>
> #include "OSAtomicLock.h"
>
> static OSAtomicLock __myGlobalLock = OSAtomicLockInit;
>
> int main (int argc, const char** argv)
> {
> OSAtomicAutoLock
> (
> &__myGlobalLock,
> fprintf(stderr,"hello\n");
> )
> return 0;
> }
>
> -- END test2.c
>
> and the main thread blocked;
>
> -- BEGIN test1.S
>
> L2:
> ...
> movq -24(%rbp), %rdi
> call _OSSpinLockUnlock
> movl $0, %eax
> leave
> ret
>
> -- END test1.S
>
> -- BEGIN test2.S
>
>
> L2:
> ...
> je L5
> L5:
> movq -24(%rbp), %rdi
> call _OSSpinLockLock
> movl $0, %eax
> leave
> ret
>
> -- END test2.S
>
> and the main thread will bell;
>
> Best Regards
>
