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// Copyright 2010 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 <errno.h>
#include <signal.h>
 
#include "runtime.h"
#include "go-assert.h"
 
/* For targets which don't have the required sync support.  Really
   these should be provided by gcc itself.  FIXME.  */
 
#if !defined (HAVE_SYNC_BOOL_COMPARE_AND_SWAP_4) || !defined (HAVE_SYNC_BOOL_COMPARE_AND_SWAP_8) || !defined (HAVE_SYNC_FETCH_AND_ADD_4) || !defined (HAVE_SYNC_ADD_AND_FETCH_8)
 
static pthread_mutex_t sync_lock = PTHREAD_MUTEX_INITIALIZER;
 
#endif
 
#ifndef HAVE_SYNC_BOOL_COMPARE_AND_SWAP_4
 
_Bool
__sync_bool_compare_and_swap_4 (uint32*, uint32, uint32)
  __attribute__ ((visibility ("hidden")));
 
_Bool
__sync_bool_compare_and_swap_4 (uint32* ptr, uint32 old, uint32 new)
{
  int i;
  _Bool ret;
 
  i = pthread_mutex_lock (&sync_lock);
  __go_assert (i == 0);
 
  if (*ptr != old)
    ret = 0;
  else
    {
      *ptr = new;
      ret = 1;
    }
 
  i = pthread_mutex_unlock (&sync_lock);
  __go_assert (i == 0);
 
  return ret;
}
 
#endif
 
#ifndef HAVE_SYNC_BOOL_COMPARE_AND_SWAP_8
 
_Bool
__sync_bool_compare_and_swap_8 (uint64*, uint64, uint64)
  __attribute__ ((visibility ("hidden")));
 
_Bool
__sync_bool_compare_and_swap_8 (uint64* ptr, uint64 old, uint64 new)
{
  int i;
  _Bool ret;
 
  i = pthread_mutex_lock (&sync_lock);
  __go_assert (i == 0);
 
  if (*ptr != old)
    ret = 0;
  else
    {
      *ptr = new;
      ret = 1;
    }
 
  i = pthread_mutex_unlock (&sync_lock);
  __go_assert (i == 0);
 
  return ret;
}
 
#endif
 
#ifndef HAVE_SYNC_FETCH_AND_ADD_4
 
uint32
__sync_fetch_and_add_4 (uint32*, uint32)
  __attribute__ ((visibility ("hidden")));
 
uint32
__sync_fetch_and_add_4 (uint32* ptr, uint32 add)
{
  int i;
  uint32 ret;
 
  i = pthread_mutex_lock (&sync_lock);
  __go_assert (i == 0);
 
  ret = *ptr;
  *ptr += add;
 
  i = pthread_mutex_unlock (&sync_lock);
  __go_assert (i == 0);
 
  return ret;
}
 
#endif
 
#ifndef HAVE_SYNC_ADD_AND_FETCH_8
 
uint64
__sync_add_and_fetch_8 (uint64*, uint64)
  __attribute__ ((visibility ("hidden")));
 
uint64
__sync_add_and_fetch_8 (uint64* ptr, uint64 add)
{
  int i;
  uint64 ret;
 
  i = pthread_mutex_lock (&sync_lock);
  __go_assert (i == 0);
 
  *ptr += add;
  ret = *ptr;
 
  i = pthread_mutex_unlock (&sync_lock);
  __go_assert (i == 0);
 
  return ret;
}
 
#endif
 
// Called to initialize a new m (including the bootstrap m).
void
runtime_minit(void)
{
	byte* stack;
	size_t stacksize;
	stack_t ss;
 
	// Initialize signal handling.
	runtime_m()->gsignal = runtime_malg(32*1024, &stack, &stacksize);	// OS X wants >=8K, Linux >=2K
	ss.ss_sp = stack;
	ss.ss_flags = 0;
	ss.ss_size = stacksize;
	if(sigaltstack(&ss, nil) < 0)
		*(int *)0xf1 = 0xf1;
}