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[/] [openrisc/] [trunk/] [rtos/] [rtems/] [c/] [src/] [exec/] [score/] [src/] [threadhandler.c] - Blame information for rev 846

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1 30 unneback
/*
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 *  Thread Handler
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 *
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 *
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 *  COPYRIGHT (c) 1989-1999.
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 *  On-Line Applications Research Corporation (OAR).
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 *
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 *  The license and distribution terms for this file may be
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 *  found in found in the file LICENSE in this distribution or at
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 *  http://www.OARcorp.com/rtems/license.html.
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 *
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 *  $Id: threadhandler.c,v 1.2 2001-09-27 11:59:34 chris Exp $
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 */
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#include <rtems/system.h>
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#include <rtems/score/apiext.h>
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#include <rtems/score/context.h>
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#include <rtems/score/interr.h>
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#include <rtems/score/isr.h>
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#include <rtems/score/object.h>
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#include <rtems/score/priority.h>
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#include <rtems/score/states.h>
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#include <rtems/score/sysstate.h>
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#include <rtems/score/thread.h>
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#include <rtems/score/threadq.h>
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#include <rtems/score/userext.h>
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#include <rtems/score/wkspace.h>
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/*PAGE
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 *
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 *  _Thread_Handler
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 *
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 *  This routine is the "primal" entry point for all threads.
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 *  _Context_Initialize() dummies up the thread's initial context
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 *  to cause the first Context_Switch() to jump to _Thread_Handler().
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 *
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 *  This routine is the default thread exitted error handler.  It is
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 *  returned to when a thread exits.  The configured fatal error handler
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 *  is invoked to process the exit.
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 *
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 *  NOTE:
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 *
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 *  On entry, it is assumed all interrupts are blocked and that this
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 *  routine needs to set the initial isr level.  This may or may not
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 *  actually be needed by the context switch routine and as a result
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 *  interrupts may already be at there proper level.  Either way,
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 *  setting the initial isr level properly here is safe.
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 *
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 *  Currently this is only really needed for the posix port,
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 *  ref: _Context_Switch in unix/cpu.c
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 *
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 *  Input parameters:   NONE
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 *
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 *  Output parameters:  NONE
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 */
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void _Thread_Handler( void )
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{
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  ISR_Level  level;
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  Thread_Control *executing;
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  executing = _Thread_Executing;
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  /*
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   * have to put level into a register for those cpu's that use
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   * inline asm here
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   */
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  level = executing->Start.isr_level;
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  _ISR_Set_level(level);
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  /*
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   * Take care that 'begin' extensions get to complete before
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   * 'switch' extensions can run.  This means must keep dispatch
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   * disabled until all 'begin' extensions complete.
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   */
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  _User_extensions_Thread_begin( executing );
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  /*
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   *  At this point, the dispatch disable level BETTER be 1.
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   */
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  _Thread_Enable_dispatch();
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  switch ( executing->Start.prototype ) {
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    case THREAD_START_NUMERIC:
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      executing->Wait.return_argument =
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        (*(Thread_Entry_numeric) executing->Start.entry_point)(
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          executing->Start.numeric_argument
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      );
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      break;
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    case THREAD_START_POINTER:
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      executing->Wait.return_argument =
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        (*(Thread_Entry_pointer) executing->Start.entry_point)(
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          executing->Start.pointer_argument
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        );
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      break;
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    case THREAD_START_BOTH_POINTER_FIRST:
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      executing->Wait.return_argument =
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         (*(Thread_Entry_both_pointer_first) executing->Start.entry_point)(
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           executing->Start.pointer_argument,
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           executing->Start.numeric_argument
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         );
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      break;
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    case THREAD_START_BOTH_NUMERIC_FIRST:
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      executing->Wait.return_argument =
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         (*(Thread_Entry_both_numeric_first) executing->Start.entry_point)(
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           executing->Start.numeric_argument,
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           executing->Start.pointer_argument
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         );
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      break;
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  }
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  /*
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   *  In the switch above, the return code from the user thread body
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   *  was placed in return_argument.  This assumed that if it returned
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   *  anything (which is not supporting in all APIs), then it would be
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   *  able to fit in a (void *).
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   */
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  _User_extensions_Thread_exitted( executing );
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  _Internal_error_Occurred(
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    INTERNAL_ERROR_CORE,
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    TRUE,
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    INTERNAL_ERROR_THREAD_EXITTED
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  );
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}

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