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/* Copyright (c) 2013, Ben Noordhuis <[email protected]> * * Permission to use, copy, modify, and/or distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice and this permission notice appear in all copies. * * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ #ifndef UV_ATOMIC_OPS_H_ #define UV_ATOMIC_OPS_H_ #include "internal.h" /* UV_UNUSED */ #if defined(__SUNPRO_C) || defined(__SUNPRO_CC) #include <atomic.h> #endif UV_UNUSED(static int cmpxchgi(int* ptr, int oldval, int newval)); UV_UNUSED(static void cpu_relax(void)); /* Prefer hand-rolled assembly over the gcc builtins because the latter also * issue full memory barriers. */ UV_UNUSED(static int cmpxchgi(int* ptr, int oldval, int newval)) { #if defined(__i386__) || defined(__x86_64__) int out; __asm__ __volatile__ ("lock; cmpxchg %2, %1;" : "=a" (out), "+m" (*(volatile int*) ptr) : "r" (newval), "0" (oldval) : "memory"); return out; #elif defined(__MVS__) unsigned int op4; if (__plo_CSST(ptr, (unsigned int*) &oldval, newval, (unsigned int*) ptr, *ptr, &op4)) return oldval; else return op4; #elif defined(__SUNPRO_C) || defined(__SUNPRO_CC) return atomic_cas_uint((uint_t *)ptr, (uint_t)oldval, (uint_t)newval); #else return __sync_val_compare_and_swap(ptr, oldval, newval); #endif } UV_UNUSED(static void cpu_relax(void)) { #if defined(__i386__) || defined(__x86_64__) __asm__ __volatile__ ("rep; nop"); /* a.k.a. PAUSE */ #endif } #endif /* UV_ATOMIC_OPS_H_ */