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[/] [openrisc/] [trunk/] [rtos/] [rtems/] [c/] [src/] [exec/] [score/] [src/] [threadhandler.c] - Rev 619
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/* * Thread Handler * * * COPYRIGHT (c) 1989-1999. * On-Line Applications Research Corporation (OAR). * * The license and distribution terms for this file may be * found in found in the file LICENSE in this distribution or at * http://www.OARcorp.com/rtems/license.html. * * $Id: threadhandler.c,v 1.2 2001-09-27 11:59:34 chris Exp $ */ #include <rtems/system.h> #include <rtems/score/apiext.h> #include <rtems/score/context.h> #include <rtems/score/interr.h> #include <rtems/score/isr.h> #include <rtems/score/object.h> #include <rtems/score/priority.h> #include <rtems/score/states.h> #include <rtems/score/sysstate.h> #include <rtems/score/thread.h> #include <rtems/score/threadq.h> #include <rtems/score/userext.h> #include <rtems/score/wkspace.h> /*PAGE * * _Thread_Handler * * This routine is the "primal" entry point for all threads. * _Context_Initialize() dummies up the thread's initial context * to cause the first Context_Switch() to jump to _Thread_Handler(). * * This routine is the default thread exitted error handler. It is * returned to when a thread exits. The configured fatal error handler * is invoked to process the exit. * * NOTE: * * On entry, it is assumed all interrupts are blocked and that this * routine needs to set the initial isr level. This may or may not * actually be needed by the context switch routine and as a result * interrupts may already be at there proper level. Either way, * setting the initial isr level properly here is safe. * * Currently this is only really needed for the posix port, * ref: _Context_Switch in unix/cpu.c * * Input parameters: NONE * * Output parameters: NONE */ void _Thread_Handler( void ) { ISR_Level level; Thread_Control *executing; executing = _Thread_Executing; /* * have to put level into a register for those cpu's that use * inline asm here */ level = executing->Start.isr_level; _ISR_Set_level(level); /* * Take care that 'begin' extensions get to complete before * 'switch' extensions can run. This means must keep dispatch * disabled until all 'begin' extensions complete. */ _User_extensions_Thread_begin( executing ); /* * At this point, the dispatch disable level BETTER be 1. */ _Thread_Enable_dispatch(); switch ( executing->Start.prototype ) { case THREAD_START_NUMERIC: executing->Wait.return_argument = (*(Thread_Entry_numeric) executing->Start.entry_point)( executing->Start.numeric_argument ); break; case THREAD_START_POINTER: executing->Wait.return_argument = (*(Thread_Entry_pointer) executing->Start.entry_point)( executing->Start.pointer_argument ); break; case THREAD_START_BOTH_POINTER_FIRST: executing->Wait.return_argument = (*(Thread_Entry_both_pointer_first) executing->Start.entry_point)( executing->Start.pointer_argument, executing->Start.numeric_argument ); break; case THREAD_START_BOTH_NUMERIC_FIRST: executing->Wait.return_argument = (*(Thread_Entry_both_numeric_first) executing->Start.entry_point)( executing->Start.numeric_argument, executing->Start.pointer_argument ); break; } /* * In the switch above, the return code from the user thread body * was placed in return_argument. This assumed that if it returned * anything (which is not supporting in all APIs), then it would be * able to fit in a (void *). */ _User_extensions_Thread_exitted( executing ); _Internal_error_Occurred( INTERNAL_ERROR_CORE, TRUE, INTERNAL_ERROR_THREAD_EXITTED ); }
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