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annotate packages/kernel/current/include/sched.inl @ 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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1 #ifndef CYGONCE_KERNEL_SCHED_INL
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2 #define CYGONCE_KERNEL_SCHED_INL
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3
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4 //==========================================================================
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5 //
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6 // sched.inl
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7 //
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8 // Scheduler class inlines
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9 //
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10 //==========================================================================
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11 //####COPYRIGHTBEGIN####
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12 //
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13 // -------------------------------------------
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14 // The contents of this file are subject to the Red Hat eCos Public License
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15 // Version 1.1 (the "License"); you may not use this file except in
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16 // compliance with the License. You may obtain a copy of the License at
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17 // http://www.redhat.com/
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18 //
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19 // Software distributed under the License is distributed on an "AS IS"
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20 // basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
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21 // License for the specific language governing rights and limitations under
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22 // the License.
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23 //
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24 // The Original Code is eCos - Embedded Configurable Operating System,
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25 // released September 30, 1998.
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26 //
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27 // The Initial Developer of the Original Code is Red Hat.
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28 // Portions created by Red Hat are
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29 // Copyright (C) 1998, 1999, 2000 Red Hat, Inc.
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30 // All Rights Reserved.
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31 // -------------------------------------------
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32 //
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33 //####COPYRIGHTEND####
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34 //==========================================================================
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35 //#####DESCRIPTIONBEGIN####
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36 //
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37 // Author(s): nickg
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38 // Contributors: nickg
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39 // Date: 1997-09-09
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40 // Purpose: Define inlines for scheduler classes
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41 // Description: Inline functions for the scheduler classes. These are
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42 // not defined in the header so that we have the option
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43 // of making them non-inline.
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44 // Usage:
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45 // #include <cyg/kernel/sched.hxx>
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46 // ...
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47 // #include <cyg/kernel/sched.inl>
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48 // ...
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49 //
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50 //####DESCRIPTIONEND####
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51 //
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52 //==========================================================================
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53
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54 #include <cyg/kernel/instrmnt.h>
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55
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56 #include <cyg/kernel/thread.inl> // we use some thread inlines here
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57
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58 // -------------------------------------------------------------------------
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59 // Inlines for Cyg_Scheduler class
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60
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61 inline void Cyg_Scheduler::lock()
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62 {
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63 // We do not need to do a read-modify-write sequence here because
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64 // the scheduler lock is strictly nesting. Even if we are interrupted
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65 // partway through the increment, the lock will be returned to the same
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66 // value before we are resumed/rescheduled.
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67
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68 HAL_REORDER_BARRIER();
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69
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70 sched_lock++;
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71
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72 HAL_REORDER_BARRIER();
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73
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74 CYG_INSTRUMENT_SCHED(LOCK,sched_lock,0);
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75 };
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76
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77 inline void Cyg_Scheduler::unlock()
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78 {
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79 // This is an inline wrapper for the real scheduler unlock function in
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80 // Cyg_Scheduler::unlock_inner().
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81
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82 // Only do anything if the lock is about to go zero, otherwise we simply
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83 // decrement and return. As with lock() we do not need any special code
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84 // to decrement the lock counter.
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85
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86 CYG_INSTRUMENT_SCHED(UNLOCK,sched_lock,0);
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87
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88 HAL_REORDER_BARRIER();
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89
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90 cyg_ucount32 __lock = sched_lock - 1;
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91
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92 if( __lock == 0 ) unlock_inner(0);
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93 else sched_lock = __lock;
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94
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95 HAL_REORDER_BARRIER();
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96 }
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97
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98 inline void Cyg_Scheduler::reschedule()
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99 {
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100 // This function performs the equivalent of calling unlock() and
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101 // lock() is succession. Unlike that pair, however, it does not
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102 // leave a brief window between the calls when the lock is unclaimed
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103 // by the current thread.
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104
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105 CYG_INSTRUMENT_SCHED(RESCHEDULE,sched_lock,0);
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106
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107 unlock_inner( sched_lock );
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108 }
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109
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110 inline void Cyg_Scheduler::unlock_simple()
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111 {
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112 // This function decrements the lock, but does not call unlock_inner().
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113 // Therefore does not immediately allow another thread to run:
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114 // merely makes it possible for some other thread to run at some
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115 // indeterminate future time. This is mainly for use by
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116 // debuggers, it should not normally be used anywhere else.
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117
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118 CYG_INSTRUMENT_SCHED(UNLOCK,sched_lock,0);
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119
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120 HAL_REORDER_BARRIER();
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121
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122 if (sched_lock > 0)
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123 sched_lock = sched_lock - 1;
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124
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125 HAL_REORDER_BARRIER();
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126 }
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127
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128
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129 // -------------------------------------------------------------------------
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130 // Inlines for Cyg_SchedThread class
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131
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132 inline void Cyg_SchedThread::remove()
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133 {
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134 if( queue != NULL )
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135 {
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136 queue->remove((Cyg_Thread *)this);
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137 queue = NULL;
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138 }
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139 }
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140
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141 // -------------------------------------------------------------------------
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142
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143 #endif // ifndef CYGONCE_KERNEL_SCHED_INL
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144 // EOF sched.inl