source:
rtems/cpukit/score/src/threadhandler.c
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a6eef8b
Last change on this file since a6eef8b was a6eef8b, checked in by Joel Sherrill <joel.sherrill@…>, on 09/04/03 at 18:52:48 | |
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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.rtems.com/license/LICENSE. |
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 | |
57 | void _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 | #if defined(__USE_INIT_FINI__) |
66 | extern void _init(void); |
67 | #endif |
68 | #if defined(__USE__MAIN__) |
69 | extern void _main(void); |
70 | #endif |
71 | |
72 | executing = _Thread_Executing; |
73 | |
74 | /* |
75 | * have to put level into a register for those cpu's that use |
76 | * inline asm here |
77 | */ |
78 | |
79 | level = executing->Start.isr_level; |
80 | _ISR_Set_level(level); |
81 | |
82 | #if defined(__USE_INIT_FINI__) || defined(__USE__MAIN__) |
83 | doneCons = doneConstructors; |
84 | doneConstructors = 1; |
85 | #endif |
86 | |
87 | #if ( CPU_HARDWARE_FP == TRUE ) || ( CPU_SOFTWARE_FP == TRUE ) |
88 | #if ( CPU_USE_DEFERRED_FP_SWITCH == TRUE ) |
89 | if ( (executing->fp_context != NULL) && !_Thread_Is_allocated_fp( executing ) ) { |
90 | if ( _Thread_Allocated_fp != NULL ) |
91 | _Context_Save_fp( &_Thread_Allocated_fp->fp_context ); |
92 | _Thread_Allocated_fp = executing; |
93 | } |
94 | #endif |
95 | #endif |
96 | |
97 | |
98 | /* |
99 | * Take care that 'begin' extensions get to complete before |
100 | * 'switch' extensions can run. This means must keep dispatch |
101 | * disabled until all 'begin' extensions complete. |
102 | */ |
103 | |
104 | _User_extensions_Thread_begin( executing ); |
105 | |
106 | /* |
107 | * At this point, the dispatch disable level BETTER be 1. |
108 | */ |
109 | |
110 | _Thread_Enable_dispatch(); |
111 | #if defined(__USE_INIT_FINI__) |
112 | if (!doneCons && _init) |
113 | _init (); |
114 | #endif |
115 | #if defined(__USE__MAIN__) |
116 | if (!doneCons && _main) |
117 | __main (); |
118 | #endif |
119 | |
120 | |
121 | switch ( executing->Start.prototype ) { |
122 | case THREAD_START_NUMERIC: |
123 | executing->Wait.return_argument = |
124 | (*(Thread_Entry_numeric) executing->Start.entry_point)( |
125 | executing->Start.numeric_argument |
126 | ); |
127 | break; |
128 | case THREAD_START_POINTER: |
129 | executing->Wait.return_argument = |
130 | (*(Thread_Entry_pointer) executing->Start.entry_point)( |
131 | executing->Start.pointer_argument |
132 | ); |
133 | break; |
134 | case THREAD_START_BOTH_POINTER_FIRST: |
135 | executing->Wait.return_argument = |
136 | (*(Thread_Entry_both_pointer_first) executing->Start.entry_point)( |
137 | executing->Start.pointer_argument, |
138 | executing->Start.numeric_argument |
139 | ); |
140 | break; |
141 | case THREAD_START_BOTH_NUMERIC_FIRST: |
142 | executing->Wait.return_argument = |
143 | (*(Thread_Entry_both_numeric_first) executing->Start.entry_point)( |
144 | executing->Start.numeric_argument, |
145 | executing->Start.pointer_argument |
146 | ); |
147 | break; |
148 | } |
149 | |
150 | /* |
151 | * In the switch above, the return code from the user thread body |
152 | * was placed in return_argument. This assumed that if it returned |
153 | * anything (which is not supporting in all APIs), then it would be |
154 | * able to fit in a (void *). |
155 | */ |
156 | |
157 | _User_extensions_Thread_exitted( executing ); |
158 | |
159 | _Internal_error_Occurred( |
160 | INTERNAL_ERROR_CORE, |
161 | TRUE, |
162 | INTERNAL_ERROR_THREAD_EXITTED |
163 | ); |
164 | } |
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