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//==========================================================================

//

//      sched.cxx

//

//      POSIX scheduler API implementation

//

//==========================================================================

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//

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// the terms of the GNU General Public License as published by the Free     

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// for more details.                                                        

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//

// 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,       

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// ####ECOSGPLCOPYRIGHTEND####                                              

//==========================================================================

//#####DESCRIPTIONBEGIN####

//

// Author(s):           nickg

// Contributors:        nickg

// Date:                2000-03-27

// Purpose:             POSIX scheduler API implementation

// Description:         This file contains the implementation of the POSIX scheduler

//                      functions.

//              

//              

//

//####DESCRIPTIONEND####

//

//==========================================================================

#include <pkgconf/hal.h>

#include <pkgconf/kernel.h>

#include <pkgconf/posix.h>

#include <cyg/kernel/ktypes.h>         // base kernel types

#include <cyg/infra/cyg_trac.h>        // tracing macros

#include <cyg/infra/cyg_ass.h>         // assertion macros

#include "pprivate.h"                   // POSIX private header

#include <cyg/kernel/sched.hxx>        // scheduler definitions

#include <cyg/kernel/thread.hxx>       // thread definitions

#include <cyg/kernel/sched.inl>        // scheduler inlines

#include <cyg/kernel/thread.inl>       // thread inlines

//==========================================================================

// Process scheduling functions.

//--------------------------------------------------------------------------

// Set scheduling parameters for given process.

int sched_setparam (pid_t pid, const struct sched_param *param)

{

    CYG_REPORT_FUNCTYPE( "returning %d" );

    if( pid != 0 )

    {

        errno = ESRCH;

        CYG_REPORT_RETVAL( -1 );

        return -1;

    }

    errno = ENOSYS;

    CYG_REPORT_RETVAL( -1 );

    return -1;

}

//--------------------------------------------------------------------------

// Get scheduling parameters for given process.

int sched_getparam (pid_t pid, struct sched_param *param)

{

    CYG_REPORT_FUNCTYPE( "returning %d" );

    if( pid != 0 )

    {

        errno = ESRCH;

        CYG_REPORT_RETVAL( -1 );

        return -1;

    }

    errno = ENOSYS;

    CYG_REPORT_RETVAL( -1 );

    return -1;

}

//--------------------------------------------------------------------------

// Set scheduling policy and/or parameters for given process.

int sched_setscheduler (pid_t pid,

                        int policy,

                        const struct sched_param *param)

{

    CYG_REPORT_FUNCTYPE( "returning %d" );

    if( pid != 0 )

    {

        errno = ESRCH;

        CYG_REPORT_RETVAL( -1 );

        return -1;

    }

    errno = ENOSYS;

    CYG_REPORT_RETVAL( -1 );

    return -1;

}

//--------------------------------------------------------------------------

// Get scheduling policy for given process.

int sched_getscheduler (pid_t pid)

{

    CYG_REPORT_FUNCTYPE( "returning %d" );

    if( pid != 0 )

    {

        errno = ESRCH;

        CYG_REPORT_RETVAL( 0 );

        return -1;

    }

    errno = ENOSYS;

    CYG_REPORT_RETVAL( -1 );

    return -1;

}

//--------------------------------------------------------------------------

// Force current thread to relinquish the processor.

int sched_yield (void)

{

    CYG_REPORT_FUNCTYPE( "returning %d" );

    Cyg_Thread::yield();

    CYG_REPORT_RETVAL( 0 );

    return 0;

}

//==========================================================================

// Scheduler parameter limits.

//--------------------------------------------------------------------------

// Get maximum priority value for a policy.

int sched_get_priority_max (int policy)

{

    CYG_REPORT_FUNCTYPE( "returning %d" );

    if( policy != SCHED_FIFO &&

        policy != SCHED_RR &&

        policy != SCHED_OTHER )

    {

        errno = EINVAL;

        CYG_REPORT_RETVAL( -1 );

        return -1;

    }

    int pri = PTHREAD_POSIX_PRIORITY( CYG_THREAD_MAX_PRIORITY );

    CYG_REPORT_RETVAL( pri );

    return pri;

}

//--------------------------------------------------------------------------

// Get minimum priority value for a policy.

int sched_get_priority_min (int policy)

{

    CYG_REPORT_FUNCTYPE( "returning %d" );

    if( policy != SCHED_FIFO &&

        policy != SCHED_RR &&

        policy != SCHED_OTHER )

    {

        errno = EINVAL;

        CYG_REPORT_RETVAL( -1 );

        return -1;

    }

    // idle thread priority isn't valid for general use, so subtract 1

    int pri = PTHREAD_POSIX_PRIORITY( CYG_THREAD_MIN_PRIORITY-1 );

    CYG_REPORT_RETVAL( pri );

    return pri;

}

//--------------------------------------------------------------------------

// Get the SCHED_RR interval for the given process.

int sched_rr_get_interval (pid_t pid, struct timespec *t)

{

    CYG_REPORT_FUNCTYPE( "returning %d" );

#ifdef CYGPKG_POSIX_CLOCKS

    if( pid != 0 )

    {

        errno = ESRCH;

        CYG_REPORT_RETVAL( -1 );

        return -1;

    }

    cyg_ticks_to_timespec( CYGNUM_KERNEL_SCHED_TIMESLICE_TICKS, t );

    CYG_REPORT_RETVAL( 0 );

    return 0;

#else

    errno = ENOSYS;

    CYG_REPORT_RETVAL( -1 );

    return -1;

#endif

}

// -------------------------------------------------------------------------

// EOF sched.cxx