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//==========================================================================
//
//        wallclock.cxx
//
//        WallClock test
//
//==========================================================================
//####ECOSGPLCOPYRIGHTBEGIN####
// -------------------------------------------
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// or inline functions from this file, or you compile this file and link it
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//####ECOSGPLCOPYRIGHTEND####
//==========================================================================
//#####DESCRIPTIONBEGIN####
//
// Author(s):     nickg
// Contributors:    nickg
// Date:          1998-07-20
// Description:   Tests the Kernel Wall Clock
//                This test exercises the WallClock class and checks that it
//                keeps time correctly.
//####DESCRIPTIONEND####
// -------------------------------------------------------------------------
 
#include <pkgconf/hal.h>
#include <pkgconf/kernel.h>
 
#include <cyg/kernel/thread.hxx>
#include <cyg/kernel/thread.inl>
#include <cyg/kernel/sched.hxx>
#include <cyg/kernel/mutex.hxx>
#include <cyg/kernel/sema.hxx>
#include <cyg/kernel/clock.hxx>
 
#include <cyg/kernel/diag.h>
 
#include <cyg/io/wallclock.hxx>         // The WallClock API
 
#include <cyg/infra/testcase.h>
 
#if defined(CYGFUN_KERNEL_THREADS_TIMER) && \
    defined(CYGVAR_KERNEL_COUNTERS_CLOCK)
 
#include <cyg/kernel/sched.inl>
 
// -------------------------------------------------------------------------
// Data for the test
 
#ifdef CYGNUM_HAL_STACK_SIZE_TYPICAL
#define STACKSIZE CYGNUM_HAL_STACK_SIZE_TYPICAL
#else
#define STACKSIZE       (2*1024)        // size of thread stack
#endif
 
char thread_stack[STACKSIZE];
 
inline void *operator new(size_t size, void *ptr) { return ptr; };
 
// array of threads.
char thread[sizeof(Cyg_Thread)];
 
Cyg_Thread *th;
 
// MN10300 sim takes 1min15secs to do one loop on 300MHz PII.
#define LOOPS_SIM       2
#define LOOPS_HW        10
 
cyg_int32 loops = LOOPS_HW;
cyg_tick_count one_sec;
 
// -------------------------------------------------------------------------
// Thread body
 
 
void wallclock_thread( CYG_ADDRWORD id )
{
    cyg_uint32 base;
    cyg_uint32 wtime;
    cyg_tick_count ticks;
 
    CYG_TEST_INFO("Testing accuracy of wallclock (10 seconds silence)");
 
    // Check clock only every other second since the call itself may
    // take about a second.
 
    // Start by synchronizing to next wallclock increment, then wait for
    // a bit to get away from the exact time of the increment (or minor
    // inaccuracies in the HW clock will cause failures).
    wtime = Cyg_WallClock::wallclock->get_current_time();
    do {
        base = Cyg_WallClock::wallclock->get_current_time();
    } while (base == wtime);
    th->delay( one_sec/10 );
 
    for( int i = 0; i < loops; i += 2 )
    {
        // Make a note of the time
        ticks = Cyg_Clock::real_time_clock->current_value();
 
        wtime = Cyg_WallClock::wallclock->get_current_time();
        if(wtime != base+i)
        {
            diag_printf("offset %d, read %d, expected %d\n", i, wtime, base+i);
            CYG_TEST_FAIL_FINISH( "Clock out of sync" );
        }
 
        // then calculate how much the above took so the delay
        // below can be made accurate.
        ticks = Cyg_Clock::real_time_clock->current_value() - ticks;
 
        th->delay( 2*one_sec - ticks );
    }
 
    if ( ! cyg_test_is_simulator ) {
        CYG_TEST_INFO("Tick output. Two seconds between each output.");
 
        // Start by synchronizing to next wallclock increment, then
        // wait for a bit to get away from the exact time of the
        // increment (or minor inaccuracies in the HW clock will cause
        // failures).
        wtime = Cyg_WallClock::wallclock->get_current_time();
        do {
            base = Cyg_WallClock::wallclock->get_current_time();
        } while (base == wtime);
        th->delay( one_sec/10 );
 
        for( int i = 0; i < loops; i += 2 )
        {
            // Make a note of the time
            ticks = Cyg_Clock::real_time_clock->current_value();
 
            wtime = Cyg_WallClock::wallclock->get_current_time();
            if(wtime != base+i)
            {
                diag_printf("wallclock drift: saw %d expected %d\n", 
                            wtime, base+i);
            }
            CYG_TEST_STILL_ALIVE(i, "2xtick...");
 
            // then calculate how much the above took so the delay
            // below can be made accurate.
            ticks = Cyg_Clock::real_time_clock->current_value() - ticks;
 
            th->delay( 2*one_sec - ticks );
        }
    }
 
    CYG_TEST_PASS_FINISH("Wallclock OK");
 
}
 
// -------------------------------------------------------------------------
 
 
#ifdef CYGSEM_HAL_STOP_CONSTRUCTORS_ON_FLAG
externC void
cyg_hal_invoke_constructors();
#endif
 
externC void
cyg_start( void )
{
#ifdef CYGSEM_HAL_STOP_CONSTRUCTORS_ON_FLAG
    cyg_hal_invoke_constructors();
#endif
    CYG_TEST_INIT();
 
    // Dont run this test if we are in a simulator, it just takes far too long.
    if( cyg_test_is_simulator )
        CYG_TEST_NA("Wallclock test takes too long in simulators");
 
    CYG_TEST_INFO("Starting wallclock test");
 
    Cyg_Clock::cyg_resolution res = Cyg_Clock::real_time_clock->get_resolution();
 
    one_sec = ( res.divisor * 1000000000LL ) / res.dividend ;
 
    th = new((void *)&thread) Cyg_Thread(CYG_SCHED_DEFAULT_INFO,
                                         wallclock_thread,
                                         0,
                                         "wallclock_thread",
                                         (CYG_ADDRESS)thread_stack,
                                         STACKSIZE
        );
 
    th->resume();
 
    // Get the world going
    Cyg_Scheduler::scheduler.start();
 
}
 
#else // if defined(CYGFUN_KERNEL_THREADS_TIMER) etc...
 
externC void
cyg_start( void )
{
    CYG_TEST_INIT();
    CYG_TEST_NA("Kernel real-time clock/threads timer disabled");
}
 
#endif // if defined(CYGFUN_KERNEL_THREADS_TIMER) etc...
 
// -------------------------------------------------------------------------
// EOF wallclock.cxx