/* os-unix-sysdep.c                  -*-C-*-
 *
 *************************************************************************
 *
 *  @copyright
 *  Copyright (C) 2009-2013, Intel Corporation
 *  All rights reserved.
 *  
 *  @copyright
 *  Redistribution and use in source and binary forms, with or without
 *  modification, are permitted provided that the following conditions
 *  are met:
 *  
 *    * Redistributions of source code must retain the above copyright
 *      notice, this list of conditions and the following disclaimer.
 *    * Redistributions in binary form must reproduce the above copyright
 *      notice, this list of conditions and the following disclaimer in
 *      the documentation and/or other materials provided with the
 *      distribution.
 *    * Neither the name of Intel Corporation nor the names of its
 *      contributors may be used to endorse or promote products derived
 *      from this software without specific prior written permission.
 *  
 *  @copyright
 *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 *  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 *  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 *  A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 *  HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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 *  BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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 *  POSSIBILITY OF SUCH DAMAGE.
 *************************************************************************
 *
 * This file contains generic implementations of system-specific code for
 * Unix-based systems
 */

#include "os.h"
#include "sysdep.h"

/*
 * The cycle counter is used for debugging.  This funciton is only called if
 * CILK_PROFILE is defined when the runtime is built.
 */
COMMON_SYSDEP unsigned long long __cilkrts_getticks(void)
{
#   warning "unimplemented cycle counter"
    return 0;
}

/*
 * A "short pause" - called from the Cilk runtime's spinloops.
 */
COMMON_SYSDEP void __cilkrts_short_pause(void)
{
#   warning __cilkrts_short_pause empty
}

/*
 * Interlocked exchange - used to implement the Cilk runtime's spinloops
 */
COMMON_SYSDEP int __cilkrts_xchg(volatile int *ptr, int x)
{
    x = __sync_lock_test_and_set(ptr, x);
    return x;
}


/*
 * Restore the floating point state that is stored in a stack frame at each
 * spawn.  This should be called each time a frame is resumed.
 *
 * Only valid for IA32 and Intel64 processors.
 */
void restore_x86_fp_state (__cilkrts_stack_frame *sf)
{
}


/*
 * Save the floating point state to the __cilkrts_stack_frame at each spawn.
 *
 * Architecture-specific - Should only be needed on IA32 and Intel64
 * processors.
 */
void sysdep_save_fp_ctrl_state(__cilkrts_stack_frame *sf)
{
}