source: rtems/cpukit/score/src/threadhandler.c @ 94ab166

4.104.114.84.95
Last change on this file since 94ab166 was 94ab166, checked in by Joel Sherrill <joel.sherrill@…>, on Nov 20, 2001 at 6:22:35 PM

2001-11-20 Joel Sherrill <joel@…>

  • src/threadhandler.c: When USEMAIN is defined by the toolset, invoke the global constructors via main. Reported as tested by Alexandra Kossovsky <sasha@…> and Victor V. Vengerov <vvv@…> in conjunction with a new set of tool RPMs (gcc2.95.3newlib1.9.0-3). This was tracked as GNATS PR tools/84.
  • Property mode set to 100644
File size: 4.0 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#if defined(__USE_INIT_FINI__) || defined(__USE__MAIN__)
62  static char doneConstructors;
63  char doneCons;
64#endif
65 
66  executing = _Thread_Executing;
67 
68  /*
69   * have to put level into a register for those cpu's that use
70   * inline asm here
71   */
72 
73  level = executing->Start.isr_level;
74  _ISR_Set_level(level);
75
76#if defined(__USE_INIT_FINI__) || defined(__USE__MAIN__)
77  doneCons = doneConstructors;
78  doneConstructors = 1;
79#endif
80
81  /*
82   * Take care that 'begin' extensions get to complete before
83   * 'switch' extensions can run.  This means must keep dispatch
84   * disabled until all 'begin' extensions complete.
85   */
86 
87  _User_extensions_Thread_begin( executing );
88 
89  /*
90   *  At this point, the dispatch disable level BETTER be 1.
91   */
92
93  _Thread_Enable_dispatch();
94#if defined(__USE_INIT_FINI__)
95  if (!doneCons)
96    _init ();
97#endif
98#if defined(__USE__MAIN__)
99  if (!doneCons)
100    __main ();
101#endif
102
103 
104  switch ( executing->Start.prototype ) {
105    case THREAD_START_NUMERIC:
106      executing->Wait.return_argument = 
107        (*(Thread_Entry_numeric) executing->Start.entry_point)(
108          executing->Start.numeric_argument
109      );
110      break;
111    case THREAD_START_POINTER:
112      executing->Wait.return_argument =
113        (*(Thread_Entry_pointer) executing->Start.entry_point)(
114          executing->Start.pointer_argument
115        );
116      break;
117    case THREAD_START_BOTH_POINTER_FIRST:
118      executing->Wait.return_argument = 
119         (*(Thread_Entry_both_pointer_first) executing->Start.entry_point)( 
120           executing->Start.pointer_argument,
121           executing->Start.numeric_argument
122         );
123      break;
124    case THREAD_START_BOTH_NUMERIC_FIRST:
125      executing->Wait.return_argument = 
126         (*(Thread_Entry_both_numeric_first) executing->Start.entry_point)( 
127           executing->Start.numeric_argument,
128           executing->Start.pointer_argument
129         );
130      break;
131  }
132
133  /*
134   *  In the switch above, the return code from the user thread body
135   *  was placed in return_argument.  This assumed that if it returned
136   *  anything (which is not supporting in all APIs), then it would be
137   *  able to fit in a (void *).
138   */
139
140  _User_extensions_Thread_exitted( executing );
141
142  _Internal_error_Occurred(
143    INTERNAL_ERROR_CORE,
144    TRUE,
145    INTERNAL_ERROR_THREAD_EXITTED
146  );
147}
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