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comparison packages/language/c/libc/current/src/support/mainthread.cxx @ 2:443894e2e912 ecos-v1_2_1-release

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Block commit of eCos version 1.2.1
author jlarmour
date Tue, 11 May 1999 12:24:34 +0000
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children 41bd4f3a90de
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1:72f549f0d891 2:443894e2e912
1 //=======================================================================
2 //
3 // mainthread.cxx
4 //
5 // Support for startup of ISO C environment
6 //
7 //========================================================================
8 //####COPYRIGHTBEGIN####
9 //
10 // -------------------------------------------
11 // The contents of this file are subject to the Cygnus eCos Public License
12 // Version 1.0 (the "License"); you may not use this file except in
13 // compliance with the License. You may obtain a copy of the License at
14 // http://sourceware.cygnus.com/ecos
15 //
16 // Software distributed under the License is distributed on an "AS IS"
17 // basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
18 // License for the specific language governing rights and limitations under
19 // the License.
20 //
21 // The Original Code is eCos - Embedded Cygnus Operating System, released
22 // September 30, 1998.
23 //
24 // The Initial Developer of the Original Code is Cygnus. Portions created
25 // by Cygnus are Copyright (C) 1998,1999 Cygnus Solutions. All Rights Reserved.
26 // -------------------------------------------
27 //
28 //####COPYRIGHTEND####
29 //========================================================================
30 //#####DESCRIPTIONBEGIN####
31 //
32 // Author(s): jlarmour
33 // Contributors: jlarmour
34 // Date: 1999-01-21
35 // Purpose: Provides a thread object to call into a user-supplied
36 // main()
37 // Description: Here we define the thread object that calls
38 // cyg_libc_invoke_main() which in turn will invoke
39 // the user-supplied main() entry point function (or
40 // alternatively the dummy empty one supplied by eCos)
41 // Usage: Both the stack (cyg_libc_main_stack) and the thread
42 // (cyg_libc_main_thread) can be overriden if you provide
43 // your own symbols with those names. In the case of the
44 // stack obviously you need to ensure
45 // CYGNUM_LIBC_MAIN_STACK_SIZE corresponds to your own
46 // stack.
47 // The thread object is also available externally if you
48 // want to control it (suspend/resume/etc.) either by
49 // extern Cyg_Thread cyg_libc_main_thread; from C++, using
50 // the kernel C++ API, or
51 // extern cyg_handle_t cyg_libc_main_thread; from C using
52 // the kernel C API.
53 //
54 //####DESCRIPTIONEND####
55 //
56 //========================================================================
57
58 // CONFIGURATION
59
60 #include <pkgconf/libc.h> // C library configuration
61
62 #ifdef CYGSEM_LIBC_STARTUP_MAIN_THREAD
63
64 // INCLUDES
65
66 #include <cyg/infra/cyg_type.h> // Common type definitions and support
67 #include <pkgconf/kernel.h> // eCos kernel configuration
68 #include <cyg/kernel/thread.hxx> // eCos thread support
69 #include <cyg/kernel/thread.inl>
70 #include <cyg/hal/hal_arch.h> // for CYGNUM_HAL_STACK_SIZE_TYPICAL
71
72
73 // EXTERNS
74
75 #ifdef CYGSEM_LIBC_INVOKE_DEFAULT_STATIC_CONSTRUCTORS
76 extern cyg_bool cyg_hal_stop_constructors;
77 #endif
78
79 // FUNCTION PROTOTYPES
80
81 externC void
82 cyg_libc_invoke_main( CYG_ADDRWORD );
83
84 // STATICS
85
86 #ifdef CYGSEM_LIBC_INVOKE_DEFAULT_STATIC_CONSTRUCTORS
87 class cyg_libc_dummy_constructor_class {
88 public:
89 cyg_libc_dummy_constructor_class(void) { ++cyg_hal_stop_constructors; }
90 };
91
92 static cyg_libc_dummy_constructor_class cyg_libc_dummy_constructor_obj
93 CYG_INIT_PRIORITY(PREDEFAULT);
94 #endif
95
96 // override stack size on some platforms
97 #ifdef CYGNUM_HAL_STACK_SIZE_TYPICAL
98 # if CYGNUM_LIBC_MAIN_STACK_SIZE < CYGNUM_HAL_STACK_SIZE_TYPICAL
99 # undef CYGNUM_LIBC_MAIN_STACK_SIZE
100 # define CYGNUM_LIBC_MAIN_STACK_SIZE CYGNUM_HAL_STACK_SIZE_TYPICAL
101 # endif
102 #endif
103
104 // Make this weak so that users can override this from their own code
105 // if they really want. FIXME: but its still allocated
106 cyg_uint8 cyg_libc_main_stack[ CYGNUM_LIBC_MAIN_STACK_SIZE ]
107 CYGBLD_ATTRIB_WEAK;
108
109 // GLOBALS
110
111 // let the main thread be global so people can play with it (e.g. suspend
112 // or resume etc.) if that's what they want to do
113 Cyg_Thread cyg_libc_main_thread CYGBLD_ATTRIB_WEAK CYG_INIT_PRIORITY(LIBC) =
114 Cyg_Thread(CYG_SCHED_DEFAULT_INFO,
115 &cyg_libc_invoke_main, (CYG_ADDRWORD) 0,
116 "main",
117 (CYG_ADDRESS) &cyg_libc_main_stack,
118 CYGNUM_LIBC_MAIN_STACK_SIZE);
119
120 #endif // ifdef CYGSEM_LIBC_STARTUP_MAIN_THREAD
121
122 // EOF mainthread.cxx