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* Added execute permissions to files missed in conversion from CVS
author alexs
date Mon, 12 Oct 2009 02:26:09 +0100
parents e8b69d9c90a6
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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 //####ECOSGPLCOPYRIGHTBEGIN####
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12 // -------------------------------------------
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13 // This file is part of eCos, the Embedded Configurable Operating System.
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14 // Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
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15 //
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16 // eCos is free software; you can redistribute it and/or modify it under
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17 // the terms of the GNU General Public License as published by the Free
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18 // Software Foundation; either version 2 or (at your option) any later version.
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19 //
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20 // eCos is distributed in the hope that it will be useful, but WITHOUT ANY
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21 // WARRANTY; without even the implied warranty of MERCHANTABILITY or
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22 // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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23 // for more details.
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24 //
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25 // You should have received a copy of the GNU General Public License along
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26 // with eCos; if not, write to the Free Software Foundation, Inc.,
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27 // 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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28 //
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29 // As a special exception, if other files instantiate templates or use macros
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30 // or inline functions from this file, or you compile this file and link it
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31 // with other works to produce a work based on this file, this file does not
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32 // by itself cause the resulting work to be covered by the GNU General Public
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33 // License. However the source code for this file must still be made available
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34 // in accordance with section (3) of the GNU General Public License.
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35 //
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36 // This exception does not invalidate any other reasons why a work based on
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37 // this file might be covered by the GNU General Public License.
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38 //
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39 // Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
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40 // at http://sources.redhat.com/ecos/ecos-license/
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41 // -------------------------------------------
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42 //####ECOSGPLCOPYRIGHTEND####
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43 //==========================================================================
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44 //#####DESCRIPTIONBEGIN####
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45 //
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46 // Author(s): nickg
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47 // Contributors: nickg
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48 // Date: 1997-09-09
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49 // Purpose: Define Semaphore class interfaces
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50 // Description: The classes defined here provide the APIs for binary
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51 // and counting semaphores.
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52 // Usage: #include <cyg/kernel/sema.hxx>
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53 //
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54 //
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55 //####DESCRIPTIONEND####
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56 //
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57 //==========================================================================
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58
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59 #include <cyg/kernel/ktypes.h>
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60 #include <cyg/infra/cyg_ass.h> // assertion macros
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61 #include <cyg/kernel/thread.inl> // thread inlines
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63 // -------------------------------------------------------------------------
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64 // Binary semaphore. This has only two states: posted and not-posted.
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65
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66 class Cyg_Binary_Semaphore
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67 {
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68 cyg_bool state; // The binary semaphore state
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69
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70 Cyg_ThreadQueue queue; // Queue of waiting threads
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71
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72 public:
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73
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74 CYGDBG_DEFINE_CHECK_THIS
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75
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76 Cyg_Binary_Semaphore( // Constructor
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77 cyg_bool init_state = false // Initial state value
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78 );
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79
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80 ~Cyg_Binary_Semaphore(); // Destructor
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81
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82 cyg_bool wait(); // Wait until state == true
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83
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84 #ifdef CYGFUN_KERNEL_THREADS_TIMER
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85 cyg_bool wait( cyg_tick_count timeout );
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86 #endif // Wait until state == true or timeout
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87
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88 cyg_bool trywait(); // Set state false if possible
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89
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90 void post(); // Increment count
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91
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92 cyg_bool posted(); // Get current state
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93
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94 };
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95
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96 // -------------------------------------------------------------------------
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97 // Counting semaphore. This implements the usual counter based semaphore.
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98
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99 class Cyg_Counting_Semaphore
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100 {
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101 cyg_count32 count; // The semaphore count
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102
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103 Cyg_ThreadQueue queue; // Queue of waiting threads
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104
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105 public:
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106
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107 CYGDBG_DEFINE_CHECK_THIS
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108
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109 Cyg_Counting_Semaphore( // Constructor
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110 cyg_count32 init_count = 0 // Initial count value
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111 );
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112
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113 ~Cyg_Counting_Semaphore(); // Destructor
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114
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115 cyg_bool wait(); // Wait until decrement
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116
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117 #ifdef CYGFUN_KERNEL_THREADS_TIMER
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118 cyg_bool wait( cyg_tick_count timeout );
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119 #endif // Wait until decrement or timeout
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120
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121 cyg_bool trywait(); // Try to decrement
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122
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123 void post(); // Increment count
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124
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125 cyg_count32 peek() const; // Get current count value
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126
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127 inline
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128 cyg_bool waiting() // Is anyone waiting?
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129 {
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130 return !queue.empty();
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131 }
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132
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133 };
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134
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135 // -------------------------------------------------------------------------
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136 #endif // ifndef CYGONCE_KERNEL_SEMA_HXX
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137 // EOF sema.hxx