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annotate packages/language/c/libc/startup/current/src/mainthread.cxx @ 115:6ed91473a1cd ecos-sw-2000-08-21

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Merge from eCos master repository on 2000-08-21-22:40:54-BST
author jlarmour
date Fri, 25 Aug 2000 17:32:38 +0000
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children e0c0827131d1
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1 //=======================================================================
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2 //
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3 // mainthread.cxx
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4 //
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5 // Support for startup of ISO C environment
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6 //
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7 //========================================================================
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8 //####COPYRIGHTBEGIN####
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9 //
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10 // -------------------------------------------
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11 // The contents of this file are subject to the Red Hat eCos Public License
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12 // Version 1.1 (the "License"); you may not use this file except in
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13 // compliance with the License. You may obtain a copy of the License at
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14 // http://www.redhat.com/
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15 //
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16 // Software distributed under the License is distributed on an "AS IS"
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17 // basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
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18 // License for the specific language governing rights and limitations under
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19 // the License.
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20 //
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21 // The Original Code is eCos - Embedded Configurable Operating System,
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22 // released September 30, 1998.
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23 //
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24 // The Initial Developer of the Original Code is Red Hat.
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25 // Portions created by Red Hat are
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26 // Copyright (C) 1998, 1999, 2000 Red Hat, Inc.
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27 // All Rights Reserved.
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28 // -------------------------------------------
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29 //
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30 //####COPYRIGHTEND####
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31 //========================================================================
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32 //#####DESCRIPTIONBEGIN####
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33 //
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34 // Author(s): jlarmour
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35 // Contributors:
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36 // Date: 2000-04-30
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37 // Purpose: Provides a thread object to call into a user-supplied
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38 // main()
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39 // Description: Here we define the thread object that calls
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40 // cyg_libc_invoke_main() which in turn will invoke
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41 // the user-supplied main() entry point function (or
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42 // alternatively the dummy empty one supplied by eCos)
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43 // Usage: Both the stack (cyg_libc_main_stack) and the thread
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44 // (cyg_libc_main_thread) can be overriden if you provide
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45 // your own symbols with those names. In the case of the
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46 // stack obviously you need to ensure
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47 // CYGNUM_LIBC_MAIN_STACK_SIZE corresponds to your own
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48 // stack.
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49 // The thread object is also available externally if you
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50 // want to control it (suspend/resume/etc.) either by
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51 // extern Cyg_Thread cyg_libc_main_thread; from C++, using
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52 // the kernel C++ API, or
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53 // extern cyg_handle_t cyg_libc_main_thread; from C using
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54 // the kernel C API.
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55 //
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56 //####DESCRIPTIONEND####
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57 //
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58 //========================================================================
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59
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60 // CONFIGURATION
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61
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62 #include <pkgconf/libc_startup.h> // C library configuration
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63
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64 #ifdef CYGSEM_LIBC_STARTUP_MAIN_THREAD
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65
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66 // INCLUDES
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67
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68 #include <cyg/infra/cyg_type.h> // Common type definitions and support
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69 #include <pkgconf/kernel.h> // eCos kernel configuration
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70 #include <cyg/kernel/thread.hxx> // eCos thread support
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71 #include <cyg/kernel/thread.inl>
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72 #include <cyg/hal/hal_arch.h> // for CYGNUM_HAL_STACK_SIZE_TYPICAL
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73
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74
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75 // EXTERNS
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76
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77 #ifdef CYGSEM_LIBC_INVOKE_DEFAULT_STATIC_CONSTRUCTORS
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78 extern cyg_bool cyg_hal_stop_constructors;
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79 #endif
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80
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81 // FUNCTION PROTOTYPES
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82
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83 externC void
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84 cyg_libc_invoke_main( CYG_ADDRWORD );
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85
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86 // STATICS
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87
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88 #ifdef CYGSEM_LIBC_MAIN_STACK_FROM_SYSTEM
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89
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90 // override stack size on some platforms
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91 #ifdef CYGNUM_HAL_STACK_SIZE_TYPICAL
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92 # if CYGNUM_LIBC_MAIN_DEFAULT_STACK_SIZE < CYGNUM_HAL_STACK_SIZE_TYPICAL
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93 # undef CYGNUM_LIBC_MAIN_DEFAULT_STACK_SIZE
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94 # define CYGNUM_LIBC_MAIN_DEFAULT_STACK_SIZE CYGNUM_HAL_STACK_SIZE_TYPICAL
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95 # endif
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96 #endif
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97
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98 static cyg_uint8 cyg_libc_main_stack[ CYGNUM_LIBC_MAIN_DEFAULT_STACK_SIZE ];
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99
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100 #else // !ifdef CYGSEM_LIBC_MAIN_STACK_FROM_SYSTEM
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101
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102 extern char *cyg_libc_main_stack;
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103 extern int cyg_libc_main_stack_size;
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104
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105 #endif // !ifdef CYGSEM_LIBC_MAIN_STACK_FROM_SYSTEM
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106
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107 // GLOBALS
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108
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109 // let the main thread be global so people can play with it (e.g. suspend
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110 // or resume etc.) if that's what they want to do
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111 Cyg_Thread cyg_libc_main_thread CYGBLD_ATTRIB_INIT_PRI(CYG_INIT_LIBC) =
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112 Cyg_Thread(CYGNUM_LIBC_MAIN_THREAD_PRIORITY,
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113 &cyg_libc_invoke_main, (CYG_ADDRWORD) 0,
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114 "main",
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115 (CYG_ADDRESS) &cyg_libc_main_stack[0],
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116 #ifdef CYGSEM_LIBC_MAIN_STACK_FROM_SYSTEM
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117 CYGNUM_LIBC_MAIN_DEFAULT_STACK_SIZE
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118 #else
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119 cyg_libc_main_stack_size
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120 #endif
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121 );
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122
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123 #endif // ifdef CYGSEM_LIBC_STARTUP_MAIN_THREAD
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124
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125 // EOF mainthread.cxx