source: rtems/cpukit/score/src/threadhandler.c @ 08311cc3

4.104.114.84.95
Last change on this file since 08311cc3 was 08311cc3, checked in by Joel Sherrill <joel.sherrill@…>, on 11/17/99 at 17:51:34

Updated copyright notice.

  • Property mode set to 100644
File size: 3.6 KB
Line 
1/*
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 *  $Id$
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
57void _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}
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