/*
    $Id: setexcept.c 1.1 1995/12/17 21:37:10 digulla Exp digulla $
    $Log: setexcept.c $
 * Revision 1.1  1995/12/17  21:37:10  digulla
 * Initial revision
 *
    Desc:
    Lang: english
*/
#include "exec_intern.h"

/*****************************************************************************

    NAME */
	#include <clib/exec_protos.h>

	__AROS_LH2(ULONG, SetExcept,

/*  SYNOPSIS */
	__AROS_LA(unsigned long, newSignals, D0),
	__AROS_LA(unsigned long, signalSet, D1),

/*  LOCATION */
	struct ExecBase *, SysBase, 52, Exec)

/*  FUNCTION
	Change the mask of signals causing a task exception.

    INPUTS
	newSignals - Set of signals causing the exception.
	signalSet  - Mask of affected signals.

    RESULT
	Old mask of signals causing a task exception.

    NOTES

    EXAMPLE

    BUGS

    SEE ALSO
	AllocSignal(), FreeSignal(), Wait(), SetSignal(), Signal()

    INTERNALS

    HISTORY
	29-10-95    digulla automatically created from
			    exec_lib.fd and clib/exec_protos.h
	17-12-95    digulla Incorporated code by Matthias Fleischner

*****************************************************************************/
{
    __AROS_FUNC_INIT
    struct Task *me;
    ULONG old;

    /* Get pointer to current task */
    me=SysBase->ThisTask;

    /* Protect mask of sent signals and task lists */
    Disable();

    /* Get returncode */
    old=me->tc_SigExcept;

    /* Change exception mask */
    me->tc_SigExcept=(old&~signalSet)|(newSignals&signalSet);

    /* Does this change include an exception? */
    if(me->tc_SigExcept&me->tc_SigRecvd)
    {
	/* Yes. Set the exception flag. */
	me->tc_Flags|=TF_EXCEPT;

	/* Are taskswitches allowed? (Don't count own Disable() here) */
	if(SysBase->TDNestCnt>=0||SysBase->IDNestCnt>0)
	    /* No. Store it for later. */
	    SysBase->AttnResched|=0x80;
	else
	    /* Switches are allowed. Force a rescedule. */
	    Switch();
    }
    Enable();

    return old;
    __AROS_FUNC_EXIT
} /* SetExcept */