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annotate packages/kernel/current/include/sema.hxx @ 64:c38311975d4f ecos-sw-2000-01-28

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Merge from eCos master repository on 2000-01-28-04:28:11-GMT
author jlarmour
date Fri, 28 Jan 2000 04:59:39 +0000
parents 443894e2e912
children bf00f99aec69
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1 #ifndef CYGONCE_KERNEL_SEMA_HXX
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2 #define CYGONCE_KERNEL_SEMA_HXX
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3
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4 //==========================================================================
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5 //
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6 // sema.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 Red Hat 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
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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 Semaphore class interfaces
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41 // Description: The classes defined here provide the APIs for binary
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42 // and counting semaphores.
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43 // Usage: #include <cyg/kernel/sema.hxx>
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44 //
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45 //
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46 //####DESCRIPTIONEND####
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47 //
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48 //==========================================================================
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49
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50 #include <cyg/kernel/ktypes.h>
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51 #include <cyg/infra/cyg_ass.h> // assertion macros
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52 #include <cyg/kernel/thread.hxx>
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53
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54 // -------------------------------------------------------------------------
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55 // Binary semaphore. This has only two states: posted and not-posted.
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56
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57 class Cyg_Binary_Semaphore
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58 {
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59 cyg_bool state; // The binary semaphore state
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60
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61 Cyg_ThreadQueue queue; // Queue of waiting threads
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62
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63 public:
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64
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65 CYGDBG_DEFINE_CHECK_THIS
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66
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67 Cyg_Binary_Semaphore( // Constructor
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68 cyg_bool init_state = false // Initial state value
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69 );
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70
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71 ~Cyg_Binary_Semaphore(); // Destructor
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72
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73 cyg_bool wait(); // Wait until state == true
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74
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75 cyg_bool trywait(); // Set state false if possible
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76
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77 void post(); // Increment count
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78
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79 cyg_bool posted(); // Get current state
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80
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81 };
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82
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83 // -------------------------------------------------------------------------
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84 // Counting semaphore. This implements the usual counter based semaphore.
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85
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86 class Cyg_Counting_Semaphore
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87 {
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88 cyg_count32 count; // The semaphore count
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89
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90 Cyg_ThreadQueue queue; // Queue of waiting threads
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91
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92 public:
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93
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94 CYGDBG_DEFINE_CHECK_THIS
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95
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96 Cyg_Counting_Semaphore( // Constructor
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97 cyg_count32 init_count = 0 // Initial count value
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98 );
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99
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100 ~Cyg_Counting_Semaphore(); // Destructor
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101
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102 cyg_bool wait(); // Wait until decrement
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103
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104 #ifdef CYGFUN_KERNEL_THREADS_TIMER
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105 cyg_bool wait( cyg_tick_count timeout );
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106 #endif // Wait until decrement or timeout
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107
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108 cyg_bool trywait(); // Try to decrement
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109
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110 void post(); // Increment count
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111
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112 cyg_count32 peek(); // Get current count value
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113
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114 inline
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115 cyg_bool waiting() // Is anyone waiting?
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116 {
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117 return !queue.empty();
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118 }
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119
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120 };
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121
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122 // -------------------------------------------------------------------------
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123 #endif // ifndef CYGONCE_KERNEL_SEMA_HXX
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124 // EOF sema.hxx