atomic-ops.h File Reference

#include "internal.h"

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Functions
	UV_UNUSED (static int cmpxchgi(int *ptr, int oldval, int newval))
	UV_UNUSED (static void cpu_relax(void))

Function Documentation

UV_UNUSED() [1/2]

UV_UNUSED

(

static int

cmpxchgiint *ptr, int oldval, int newval

)

Definition at line 31 of file atomic-ops.h.

                                                                 {
#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
}

References out.

UV_UNUSED() [2/2]

UV_UNUSED

(

static void

cpu_relaxvoid

)

Definition at line 53 of file atomic-ops.h.

                                       {
#if defined(__i386__) || defined(__x86_64__)
  __asm__ __volatile__ ("rep; nop");  /* a.k.a. PAUSE */
#elif (defined(__arm__) && __ARM_ARCH >= 7) || defined(__aarch64__)
  __asm__ volatile("yield");
#endif
}