cmpxchg.h File Reference

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Macros
#define	xchg(ptr, v)
#define	__HAVE_ARCH_CMPXCHG   1
#define	cmpxchg(ptr, old, new)

Macro Definition Documentation

#define __HAVE_ARCH_CMPXCHG   1

Definition at line 67 of file cmpxchg.h.

#define cmpxchg	(		ptr,
			old,
			new
	)

Value:

({                              \
    __typeof__(ptr) __ptr = (ptr);              \
    __typeof__(*(ptr)) __old = (old);           \
    __typeof__(*(ptr)) __new = (new);           \
    __typeof__(*(ptr)) __oldval = 0;            \
                                \
    asm volatile(                       \
        "1: %0 = memw_locked(%1);\n"        \
        "   { P0 = cmp.eq(%0,%2);\n"        \
        "     if (!P0.new) jump:nt 2f; }\n"     \
        "   memw_locked(%1,p0) = %3;\n"     \
        "   if (!P0) jump 1b;\n"            \
        "2:\n"                      \
        : "=&r" (__oldval)              \
        : "r" (__ptr), "r" (__old), "r" (__new)     \
        : "memory", "p0"                \
    );                          \
    __oldval;                       \
})

Definition at line 69 of file cmpxchg.h.

#define xchg	(		ptr,
			v
	)

Value:

((__typeof__(*(ptr)))__xchg((unsigned long)(v), (ptr), \
    sizeof(*(ptr))))

Definition at line 59 of file cmpxchg.h.