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annotate packages/kernel/current/include/mutex.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_MUTEX_HXX
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2 #define CYGONCE_KERNEL_MUTEX_HXX
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3
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4 //==========================================================================
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5 //
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6 // mutex.hxx
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7 //
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8 // Mutex 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 Mutex class interfaces
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41 // Description: The classes defined here provide the APIs for mutexes
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42 // and condition variables.
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43 // Usage: #include <cyg/kernel/mutex.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
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53 #include <cyg/kernel/thread.hxx>
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54
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55 // -------------------------------------------------------------------------
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56 // Mutex.
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57
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58 class Cyg_Mutex
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59 {
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60 friend class Cyg_Condition_Variable;
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61
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62 cyg_atomic locked; // true if locked
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63
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64 Cyg_Thread *owner; // Current locking thread
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65
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66 Cyg_ThreadQueue queue; // Queue of waiting threads
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67
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68 public:
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69
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70 CYGDBG_DEFINE_CHECK_THIS
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71
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72 Cyg_Mutex(); // Create in unlocked state
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73
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74 ~Cyg_Mutex(); // Destructor
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75
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76 cyg_bool lock(); // lock and/or wait
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77
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78 cyg_bool trylock(); // try to lock and return success
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79
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80 void unlock(); // unlock
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81
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82 void release(); // release all waiting threads
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83
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84 };
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85
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86 // -------------------------------------------------------------------------
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87 // Condition variable.
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88
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89 class Cyg_Condition_Variable
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90 {
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91 Cyg_Mutex *mutex; // Associated mutex
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92
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93 Cyg_ThreadQueue queue; // Queue of waiting threads
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94
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95 public:
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96
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97 CYGDBG_DEFINE_CHECK_THIS
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98
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99 Cyg_Condition_Variable(
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100 Cyg_Mutex &mutex // linked mutex
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101 );
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102
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103 ~Cyg_Condition_Variable(); // Destructor
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104
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105 void wait(); // Wait for condition to be true
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106
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107 void signal(); // Set cond true, wake one thread
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108
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109 void broadcast(); // Set cond true, wake all threads
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110
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111 #ifdef CYGMFN_KERNEL_SYNCH_CONDVAR_TIMED_WAIT
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112
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113 // Wait until a signal or timeout expiry
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114 cyg_bool wait( cyg_tick_count timeout );
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115
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116 #endif
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117
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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_MUTEX_HXX
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124 // EOF mutex.hxx