// Widely used definitions.
//
// File:	basic.cc
// Author:	course
// Version:	2
//

#include "basic.h"
#include <new.h>		// Set_new_handler.

#ifndef _INCLUDE_HPUX_SOURCE

#include <sys/time.h>		// Tv_sec and tv_usec.
#include <sys/resource.h>	// Struct rusage.
extern "C" { int getrusage (int, struct rusage *); }


// The CPU time function:
//
// Returns amount of CPU time used so far by this
// program, in seconds.
//
double cputime(void)
{
    struct rusage resources;

    getrusage (RUSAGE_SELF, &resources);

    return ( (double) resources.ru_utime.tv_sec
	     +
	     1.0e-6 *
		 (double) resources.ru_utime.tv_usec );
}

#else // if _INCLUDE_HPUX_SOURCE

#include <sys/times.h>
#include <sys/unistd.h>

// The CPU time function:
//
// Returns amount of CPU time used so far by this
// program, in seconds.
//
double cputime(void)
{
    struct tms tms_buffer;

    times (&tms_buffer);

    static double clock_period =
	1.0 / sysconf (_SC_CLK_TCK);

    return tms_buffer.tms_utime * clock_period;
}

#endif



// Handler to be called when out of memory if
// out-of-memory error enabled.
//
void out_of_memory_handler (void)
{
	error ("Out of Memory");
}

// Enable or disable the calling of error by memory
// allocation if out of memory.  Enable calling error
// if enable_flag true; disable if false.
//
void enable_out_of_memory_error (bool enable_flag)
{
    if (enable_flag)
	set_new_handler (&out_of_memory_handler);
    else
	set_new_handler (0);
}