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//===========================================================================
//
// clock.cxx
//
// ISO C date and time implementation for clock()
//
//===========================================================================
// ####ECOSGPLCOPYRIGHTBEGIN####
// -------------------------------------------
// This file is part of eCos, the Embedded Configurable Operating System.
// Copyright (C) 1998, 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
//
// eCos is free software; you can redistribute it and/or modify it under
// the terms of the GNU General Public License as published by the Free
// Software Foundation; either version 2 or (at your option) any later
// version.
//
// eCos is distributed in the hope that it will be useful, but WITHOUT
// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
// for more details.
//
// You should have received a copy of the GNU General Public License
// along with eCos; if not, write to the Free Software Foundation, Inc.,
// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
//
// As a special exception, if other files instantiate templates or use
// macros or inline functions from this file, or you compile this file
// and link it with other works to produce a work based on this file,
// this file does not by itself cause the resulting work to be covered by
// the GNU General Public License. However the source code for this file
// must still be made available in accordance with section (3) of the GNU
// General Public License v2.
//
// This exception does not invalidate any other reasons why a work based
// on this file might be covered by the GNU General Public License.
// -------------------------------------------
// ####ECOSGPLCOPYRIGHTEND####
//===========================================================================
//#####DESCRIPTIONBEGIN####
//
// Author(s): jlarmour
// Contributors: jlarmour
// Date: 1999-03-05
// Purpose: Provides an implementation of the ISO C function clock()
// from ISO C section 7.12.2.1
// Description: This file uses the kernel real time clock to determine
// the complete running time of the system - since we only
// have one task, even though there are perhaps multiple threads
// that is still the running time of the "program"
// Usage:
//
//####DESCRIPTIONEND####
//
//===========================================================================
// CONFIGURATION
#include <pkgconf/libc_time.h> // Configuration header
#ifdef CYGSEM_LIBC_TIME_CLOCK_WORKING
# include <pkgconf/kernel.h> // Kernel config header
#endif
// INCLUDES
#include <cyg/infra/cyg_type.h> // Common type definitions and support
#include <cyg/infra/cyg_ass.h> // Assertion infrastructure
#include <cyg/infra/cyg_trac.h> // Tracing infrastructure
#include <time.h> // Header for all time-related functions
#ifdef CYGSEM_LIBC_TIME_CLOCK_WORKING
# include <cyg/kernel/clock.hxx> // Kernel clock definitions
# include <cyg/kernel/clock.inl> // Kernel clock inline functions
#endif
// TRACE
# if defined(CYGDBG_USE_TRACING) && defined(CYGNUM_LIBC_TIME_CLOCK_TRACE_LEVEL)
static int clock_trace = CYGNUM_LIBC_TIME_CLOCK_TRACE_LEVEL;
# define TL1 (0 < clock_trace)
# else
# define TL1 (0)
# endif
// FUNCTIONS
externC clock_t
clock( void )
{
CYG_REPORT_FUNCNAMETYPE( "clock", "returning clock tick %d" );
CYG_REPORT_FUNCARGVOID();
#ifdef CYGSEM_LIBC_TIME_CLOCK_WORKING
cyg_tick_count curr_clock; // kernel clock value
Cyg_Clock::cyg_resolution resolution; // kernel clock resolution
clock_t clocks;
unsigned long long temp;
CYG_TRACE0( TL1, "getting clock resolution" );
// get the resolution
resolution = Cyg_Clock::real_time_clock->get_resolution();
CYG_TRACE2( TL1, "got resolution dividend %d divisor %d. Getting "
"clock value", resolution.dividend, resolution.divisor );
// get the value
curr_clock = Cyg_Clock::real_time_clock->current_value();
CYG_TRACE1( TL1, "got clock value %d", curr_clock );
// scale the value so that clock()/CLOCKS_PER_SEC works
// We use an unsigned long long to avoid overflow as the dividend
// and divisors tend to be huge
temp = (1000000000 / CLOCKS_PER_SEC);
temp *= resolution.divisor;
temp = (unsigned long long)curr_clock * resolution.dividend / temp;
clocks = (clock_t)temp;
CYG_REPORT_RETVAL( clocks );
return clocks;
#else // i.e. ifndef CYGSEM_LIBC_TIME_CLOCK_WORKING
CYG_REPORT_RETVAL( -1 );
return (clock_t) -1;
#endif
} // clock()
// EOF clock.cxx
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