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//==========================================================================
//
//      sched.cxx
//
//      POSIX scheduler API implementation
//
//==========================================================================
//####ECOSGPLCOPYRIGHTBEGIN####
// -------------------------------------------
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// Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
//
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// for more details.
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//
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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:                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