cmpxchg.h File Reference

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Defines
#define	LOCK_PREFIX   ""
#define	__xg(x)   ((volatile long *)(x))
#define	cmpxchg(ptr, o, n)

---

Define Documentation

#define __xg

(

x

)

((volatile long *)(x))

#define cmpxchg	(	ptr,
		o,
		n		)

Value:

((__typeof__(*(ptr)))__cmpxchg((ptr),(unsigned long)(o),\
                                     (unsigned long)(n),sizeof(*(ptr))))

Referenced by ReferenceCount::decref(), ReferenceCount::incref(), return_death_pids(), take_death_pids(), and Lock::try_lock().

#define LOCK_PREFIX   ""

Taken from the standard glibc headers: asm-x86_64/system.h Including the standard asm headers never seemed to work properly.

• they use the keyword new which is offending C++
• in a newer version (mid-january 2007), the assembly code was even wrong