#ifndef _TOOLS_LINUX_ASM_X86_ATOMIC_H #define _TOOLS_LINUX_ASM_X86_ATOMIC_H #include #include #include "rmwcc.h" #define LOCK_PREFIX "\n\tlock; " /* * Atomic operations that C can't guarantee us. Useful for * resource counting etc.. */ #define ATOMIC_INIT(i) { (i) } /** * atomic_read - read atomic variable * @v: pointer of type atomic_t * * Atomically reads the value of @v. */ static inline int atomic_read(const atomic_t *v) { return ACCESS_ONCE((v)->counter); } /** * atomic_set - set atomic variable * @v: pointer of type atomic_t * @i: required value * * Atomically sets the value of @v to @i. */ static inline void atomic_set(atomic_t *v, int i) { v->counter = i; } /** * atomic_inc - increment atomic variable * @v: pointer of type atomic_t * * Atomically increments @v by 1. */ static inline void atomic_inc(atomic_t *v) { asm volatile(LOCK_PREFIX "incl %0" : "+m" (v->counter)); } /** * atomic_dec_and_test - decrement and test * @v: pointer of type atomic_t * * Atomically decrements @v by 1 and * returns true if the result is 0, or false for all other * cases. */ static inline int atomic_dec_and_test(atomic_t *v) { GEN_UNARY_RMWcc(LOCK_PREFIX "decl", v->counter, "%0", "e"); } #endif /* _TOOLS_LINUX_ASM_X86_ATOMIC_H */ n> net-next plumbingsTobias Klauser

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