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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 Cygnus eCos Public License |
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15 // Version 1.0 (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://sourceware.cygnus.com/ecos |
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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 Cygnus Operating System, released |
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25 // September 30, 1998. |
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26 // |
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27 // The Initial Developer of the Original Code is Cygnus. Portions created |
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28 // by Cygnus are Copyright (C) 1998,1999 Cygnus Solutions. All Rights Reserved. |
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29 // ------------------------------------------- |
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30 // |
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31 //####COPYRIGHTEND#### |
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32 //========================================================================== |
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33 //#####DESCRIPTIONBEGIN#### |
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34 // |
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35 // Author(s): nickg |
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36 // Contributors: nickg |
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37 // Date: 1997-09-09 |
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38 // Purpose: Define inlines for scheduler classes |
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39 // Description: Inline functions for the scheduler classes. These are |
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40 // not defined in the header so that we have the option |
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41 // of making them non-inline. |
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42 // Usage: |
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43 // #include <cyg/kernel/sched.hxx> |
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44 // ... |
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45 // #include <cyg/kernel/sched.inl> |
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46 // ... |
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47 // |
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48 //####DESCRIPTIONEND#### |
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49 // |
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50 //========================================================================== |
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51 |
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52 #include <cyg/kernel/instrmnt.h> |
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53 |
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54 #include <cyg/kernel/thread.inl> // we use some thread inlines here |
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55 |
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56 // ------------------------------------------------------------------------- |
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57 // Inlines for Cyg_Scheduler class |
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58 |
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59 inline void Cyg_Scheduler::lock() |
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60 { |
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61 // We do not need to do a read-modify-write sequence here because |
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62 // the scheduler lock is strictly nesting. Even if we are interrupted |
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63 // partway through the increment, the lock will be returned to the same |
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64 // value before we are resumed/rescheduled. |
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65 |
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66 HAL_REORDER_BARRIER(); |
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67 |
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68 sched_lock++; |
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69 |
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70 HAL_REORDER_BARRIER(); |
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71 |
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72 CYG_INSTRUMENT_SCHED(LOCK,sched_lock,0); |
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73 }; |
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74 |
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75 inline void Cyg_Scheduler::unlock() |
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76 { |
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77 // This is an inline wrapper for the real scheduler unlock function in |
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78 // Cyg_Scheduler::unlock_inner(). |
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79 |
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80 // Only do anything if the lock is about to go zero, otherwise we simply |
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81 // decrement and return. As with lock() we do not need any special code |
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82 // to decrement the lock counter. |
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83 |
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84 CYG_INSTRUMENT_SCHED(UNLOCK,sched_lock,0); |
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85 |
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86 HAL_REORDER_BARRIER(); |
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87 |
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88 cyg_ucount32 __lock = sched_lock - 1; |
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89 |
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90 if( __lock == 0 ) unlock_inner(); |
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91 else sched_lock = __lock; |
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92 |
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93 HAL_REORDER_BARRIER(); |
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94 } |
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95 |
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96 inline void Cyg_Scheduler::unlock_simple() |
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97 { |
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98 // This function decrements the lock, but does not call unlock_inner(). |
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99 // Therefore does not immediately allow another thread to run: |
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100 // merely makes it possible for some other thread to run at some |
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101 // indeterminate future time. This is mainly for use by |
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102 // debuggers, it should not normally be used anywhere else. |
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103 |
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104 CYG_INSTRUMENT_SCHED(UNLOCK,sched_lock,0); |
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105 |
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106 HAL_REORDER_BARRIER(); |
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107 |
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108 if (sched_lock > 0) |
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109 sched_lock = sched_lock - 1; |
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110 |
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111 HAL_REORDER_BARRIER(); |
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112 } |
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113 |
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114 |
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115 // ------------------------------------------------------------------------- |
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116 // Inlines for Cyg_SchedThread class |
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117 |
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118 inline void Cyg_SchedThread::remove() |
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119 { |
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120 if( queue != NULL ) |
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121 { |
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122 queue->remove((Cyg_Thread *)this); |
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123 queue = NULL; |
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124 } |
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125 } |
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126 |
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127 // ------------------------------------------------------------------------- |
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128 |
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129 #endif // ifndef CYGONCE_KERNEL_SCHED_INL |
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130 // EOF sched.inl |
