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// Copyright 2011 The Go Authors. All rights reserved.

// Use of this source code is governed by a BSD-style

// license that can be found in the LICENSE file.

#include "config.h"

#include <stddef.h>

#include <sys/types.h>

#include <sys/time.h>

#include <sched.h>

#include <unistd.h>

#ifdef HAVE_SYS_SELECT_H

#include <sys/select.h>

#endif

#include "runtime.h"

/* Spin wait.  */

void

runtime_procyield (uint32 cnt)

{

  volatile uint32 i;

  for (i = 0; i < cnt; ++i)

    {

#if defined (__i386__) || defined (__x86_64__)

      __builtin_ia32_pause ();

#endif

    }

}

/* Ask the OS to reschedule this thread.  */

void

runtime_osyield (void)

{

  sched_yield ();

}

/* Sleep for some number of microseconds.  */

void

runtime_usleep (uint32 us)

{

  struct timeval tv;

  tv.tv_sec = us / 1000000;

  tv.tv_usec = us % 1000000;

  select (0, NULL, NULL, NULL, &tv);

}