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1026 |
ivang |
/*
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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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* threadhandler.c,v 1.7 2002/05/14 17:45:36 joel 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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#if defined(__USE_INIT_FINI__) || defined(__USE__MAIN__)
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static char doneConstructors;
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char doneCons;
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#endif
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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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#if defined(__USE_INIT_FINI__) || defined(__USE__MAIN__)
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doneCons = doneConstructors;
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doneConstructors = 1;
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#endif
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#if ( CPU_HARDWARE_FP == TRUE ) || ( CPU_SOFTWARE_FP == TRUE )
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#if ( CPU_USE_DEFERRED_FP_SWITCH == TRUE )
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if ( (executing->fp_context != NULL) && !_Thread_Is_allocated_fp( executing ) ) {
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if ( _Thread_Allocated_fp != NULL )
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_Context_Save_fp( &_Thread_Allocated_fp->fp_context );
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_Thread_Allocated_fp = executing;
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}
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#endif
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#endif
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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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#if defined(__USE_INIT_FINI__)
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if (!doneCons)
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_init ();
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#endif
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#if defined(__USE__MAIN__)
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if (!doneCons)
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__main ();
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#endif
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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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