| 1 |
30 |
unneback |
/*
|
| 2 |
|
|
* Thread Handler
|
| 3 |
|
|
*
|
| 4 |
|
|
*
|
| 5 |
|
|
* COPYRIGHT (c) 1989-1999.
|
| 6 |
|
|
* On-Line Applications Research Corporation (OAR).
|
| 7 |
|
|
*
|
| 8 |
|
|
* The license and distribution terms for this file may be
|
| 9 |
|
|
* found in found in the file LICENSE in this distribution or at
|
| 10 |
|
|
* http://www.OARcorp.com/rtems/license.html.
|
| 11 |
|
|
*
|
| 12 |
|
|
* $Id: threadhandler.c,v 1.2 2001-09-27 11:59:34 chris Exp $
|
| 13 |
|
|
*/
|
| 14 |
|
|
|
| 15 |
|
|
#include <rtems/system.h>
|
| 16 |
|
|
#include <rtems/score/apiext.h>
|
| 17 |
|
|
#include <rtems/score/context.h>
|
| 18 |
|
|
#include <rtems/score/interr.h>
|
| 19 |
|
|
#include <rtems/score/isr.h>
|
| 20 |
|
|
#include <rtems/score/object.h>
|
| 21 |
|
|
#include <rtems/score/priority.h>
|
| 22 |
|
|
#include <rtems/score/states.h>
|
| 23 |
|
|
#include <rtems/score/sysstate.h>
|
| 24 |
|
|
#include <rtems/score/thread.h>
|
| 25 |
|
|
#include <rtems/score/threadq.h>
|
| 26 |
|
|
#include <rtems/score/userext.h>
|
| 27 |
|
|
#include <rtems/score/wkspace.h>
|
| 28 |
|
|
|
| 29 |
|
|
/*PAGE
|
| 30 |
|
|
*
|
| 31 |
|
|
* _Thread_Handler
|
| 32 |
|
|
*
|
| 33 |
|
|
* This routine is the "primal" entry point for all threads.
|
| 34 |
|
|
* _Context_Initialize() dummies up the thread's initial context
|
| 35 |
|
|
* to cause the first Context_Switch() to jump to _Thread_Handler().
|
| 36 |
|
|
*
|
| 37 |
|
|
* This routine is the default thread exitted error handler. It is
|
| 38 |
|
|
* returned to when a thread exits. The configured fatal error handler
|
| 39 |
|
|
* is invoked to process the exit.
|
| 40 |
|
|
*
|
| 41 |
|
|
* NOTE:
|
| 42 |
|
|
*
|
| 43 |
|
|
* On entry, it is assumed all interrupts are blocked and that this
|
| 44 |
|
|
* routine needs to set the initial isr level. This may or may not
|
| 45 |
|
|
* actually be needed by the context switch routine and as a result
|
| 46 |
|
|
* interrupts may already be at there proper level. Either way,
|
| 47 |
|
|
* setting the initial isr level properly here is safe.
|
| 48 |
|
|
*
|
| 49 |
|
|
* Currently this is only really needed for the posix port,
|
| 50 |
|
|
* ref: _Context_Switch in unix/cpu.c
|
| 51 |
|
|
*
|
| 52 |
|
|
* Input parameters: NONE
|
| 53 |
|
|
*
|
| 54 |
|
|
* Output parameters: NONE
|
| 55 |
|
|
*/
|
| 56 |
|
|
|
| 57 |
|
|
void _Thread_Handler( void )
|
| 58 |
|
|
{
|
| 59 |
|
|
ISR_Level level;
|
| 60 |
|
|
Thread_Control *executing;
|
| 61 |
|
|
|
| 62 |
|
|
executing = _Thread_Executing;
|
| 63 |
|
|
|
| 64 |
|
|
/*
|
| 65 |
|
|
* have to put level into a register for those cpu's that use
|
| 66 |
|
|
* inline asm here
|
| 67 |
|
|
*/
|
| 68 |
|
|
|
| 69 |
|
|
level = executing->Start.isr_level;
|
| 70 |
|
|
_ISR_Set_level(level);
|
| 71 |
|
|
|
| 72 |
|
|
/*
|
| 73 |
|
|
* Take care that 'begin' extensions get to complete before
|
| 74 |
|
|
* 'switch' extensions can run. This means must keep dispatch
|
| 75 |
|
|
* disabled until all 'begin' extensions complete.
|
| 76 |
|
|
*/
|
| 77 |
|
|
|
| 78 |
|
|
_User_extensions_Thread_begin( executing );
|
| 79 |
|
|
|
| 80 |
|
|
/*
|
| 81 |
|
|
* At this point, the dispatch disable level BETTER be 1.
|
| 82 |
|
|
*/
|
| 83 |
|
|
|
| 84 |
|
|
_Thread_Enable_dispatch();
|
| 85 |
|
|
|
| 86 |
|
|
switch ( executing->Start.prototype ) {
|
| 87 |
|
|
case THREAD_START_NUMERIC:
|
| 88 |
|
|
executing->Wait.return_argument =
|
| 89 |
|
|
(*(Thread_Entry_numeric) executing->Start.entry_point)(
|
| 90 |
|
|
executing->Start.numeric_argument
|
| 91 |
|
|
);
|
| 92 |
|
|
break;
|
| 93 |
|
|
case THREAD_START_POINTER:
|
| 94 |
|
|
executing->Wait.return_argument =
|
| 95 |
|
|
(*(Thread_Entry_pointer) executing->Start.entry_point)(
|
| 96 |
|
|
executing->Start.pointer_argument
|
| 97 |
|
|
);
|
| 98 |
|
|
break;
|
| 99 |
|
|
case THREAD_START_BOTH_POINTER_FIRST:
|
| 100 |
|
|
executing->Wait.return_argument =
|
| 101 |
|
|
(*(Thread_Entry_both_pointer_first) executing->Start.entry_point)(
|
| 102 |
|
|
executing->Start.pointer_argument,
|
| 103 |
|
|
executing->Start.numeric_argument
|
| 104 |
|
|
);
|
| 105 |
|
|
break;
|
| 106 |
|
|
case THREAD_START_BOTH_NUMERIC_FIRST:
|
| 107 |
|
|
executing->Wait.return_argument =
|
| 108 |
|
|
(*(Thread_Entry_both_numeric_first) executing->Start.entry_point)(
|
| 109 |
|
|
executing->Start.numeric_argument,
|
| 110 |
|
|
executing->Start.pointer_argument
|
| 111 |
|
|
);
|
| 112 |
|
|
break;
|
| 113 |
|
|
}
|
| 114 |
|
|
|
| 115 |
|
|
/*
|
| 116 |
|
|
* In the switch above, the return code from the user thread body
|
| 117 |
|
|
* was placed in return_argument. This assumed that if it returned
|
| 118 |
|
|
* anything (which is not supporting in all APIs), then it would be
|
| 119 |
|
|
* able to fit in a (void *).
|
| 120 |
|
|
*/
|
| 121 |
|
|
|
| 122 |
|
|
_User_extensions_Thread_exitted( executing );
|
| 123 |
|
|
|
| 124 |
|
|
_Internal_error_Occurred(
|
| 125 |
|
|
INTERNAL_ERROR_CORE,
|
| 126 |
|
|
TRUE,
|
| 127 |
|
|
INTERNAL_ERROR_THREAD_EXITTED
|
| 128 |
|
|
);
|
| 129 |
|
|
}
|
