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1 #ifndef CYGONCE_KERNEL_SEMA2_HXX |
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2 #define CYGONCE_KERNEL_SEMA2_HXX |
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3 |
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4 //========================================================================== |
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5 // |
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6 // sema2.hxx |
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7 // |
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8 // Semaphore class declarations |
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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 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 Semaphore class interfaces |
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39 // Description: The classes defined here provide the APIs for binary |
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40 // and counting semaphores. |
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41 // Usage: #include <cyg/kernel/sema2.hxx> |
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42 // |
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43 // |
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44 //####DESCRIPTIONEND#### |
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45 // |
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46 //========================================================================== |
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47 |
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48 #include <cyg/kernel/ktypes.h> |
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49 #include <cyg/infra/cyg_ass.h> // assertion macros |
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50 #include <cyg/kernel/thread.hxx> |
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51 |
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52 #if 0 |
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53 // THERE IS NO BINARY-SEMAPHORE-2 |
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54 |
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55 // ------------------------------------------------------------------------- |
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56 // Binary semaphore. This has only two states: posted and not-posted. |
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57 |
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58 class Cyg_Binary_Semaphore2 |
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59 { |
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60 cyg_bool state; // The binary semaphore state |
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61 |
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62 Cyg_ThreadQueue queue; // Queue of waiting threads |
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63 |
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64 public: |
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65 |
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66 CYGDBG_DEFINE_CHECK_THIS |
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67 |
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68 Cyg_Binary_Semaphore2( // Constructor |
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69 cyg_bool init_state = false // Initial state value |
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70 ); |
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71 |
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72 ~Cyg_Binary_Semaphore2(); // Destructor |
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73 |
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74 cyg_bool wait(); // Wait until state == true |
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75 |
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76 cyg_bool trywait(); // Set state false if possible |
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77 |
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78 void post(); // Increment count |
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79 |
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80 cyg_bool posted(); // Get current state |
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81 |
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82 }; |
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83 #endif |
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84 |
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85 // ------------------------------------------------------------------------- |
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86 // Counting semaphore. This implements the usual counter based semaphore. |
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87 |
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88 class Cyg_Counting_Semaphore2 |
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89 { |
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90 cyg_count32 count; // The semaphore count |
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91 |
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92 Cyg_ThreadQueue queue; // Queue of waiting threads |
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93 |
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94 public: |
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95 |
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96 CYGDBG_DEFINE_CHECK_THIS |
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97 |
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98 Cyg_Counting_Semaphore2( // Constructor |
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99 cyg_count32 init_count = 0 // Initial count value |
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100 ); |
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101 |
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102 ~Cyg_Counting_Semaphore2(); // Destructor |
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103 |
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104 cyg_bool wait(); // Wait until decrement |
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105 |
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106 #ifdef CYGFUN_KERNEL_THREADS_TIMER |
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107 cyg_bool wait( cyg_tick_count abs_timeout ); |
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108 #endif // Wait until decrement or timeout |
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109 |
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110 cyg_bool trywait(); // Try to decrement |
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111 |
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112 void post(); // Increment count |
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113 |
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114 cyg_count32 peek(); // Get current count value |
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115 |
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116 inline |
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117 cyg_bool waiting() // Is anyone waiting? |
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118 { |
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119 return !queue.empty(); |
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120 } |
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121 |
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122 }; |
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123 |
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124 // ------------------------------------------------------------------------- |
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125 #endif // ifndef CYGONCE_KERNEL_SEMA2_HXX |
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126 // EOF sema2.hxx |
