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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 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 Mutex class interfaces |
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39 // Description: The classes defined here provide the APIs for mutexes |
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40 // and condition variables. |
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41 // Usage: #include <cyg/kernel/mutex.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 |
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51 #include <cyg/kernel/thread.hxx> |
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52 |
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53 // ------------------------------------------------------------------------- |
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54 // Mutex. |
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55 |
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56 class Cyg_Mutex |
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57 { |
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58 friend class Cyg_Condition_Variable; |
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59 |
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60 cyg_atomic locked; // true if locked |
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61 |
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62 Cyg_Thread *owner; // Current locking thread |
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63 |
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64 Cyg_ThreadQueue queue; // Queue of waiting threads |
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65 |
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66 public: |
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67 |
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68 CYGDBG_DEFINE_CHECK_THIS |
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69 |
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70 Cyg_Mutex(); // Create in unlocked state |
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71 |
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72 ~Cyg_Mutex(); // Destructor |
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73 |
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74 cyg_bool lock(); // lock and/or wait |
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75 |
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76 cyg_bool trylock(); // try to lock and return success |
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77 |
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78 void unlock(); // unlock |
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79 |
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80 void release(); // release all waiting threads |
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81 |
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82 }; |
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83 |
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84 // ------------------------------------------------------------------------- |
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85 // Condition variable. |
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86 |
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87 class Cyg_Condition_Variable |
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88 { |
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89 Cyg_Mutex *mutex; // Associated mutex |
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90 |
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91 Cyg_ThreadQueue queue; // Queue of waiting threads |
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92 |
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93 public: |
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94 |
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95 CYGDBG_DEFINE_CHECK_THIS |
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96 |
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97 Cyg_Condition_Variable( |
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98 Cyg_Mutex &mutex // linked mutex |
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99 ); |
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100 |
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101 ~Cyg_Condition_Variable(); // Destructor |
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102 |
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103 void wait(); // Wait for condition to be true |
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104 |
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105 void signal(); // Set cond true, wake one thread |
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106 |
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107 void broadcast(); // Set cond true, wake all threads |
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108 |
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109 #ifdef CYGMFN_KERNEL_SYNCH_CONDVAR_TIMED_WAIT |
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110 |
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111 // Wait until a signal or timeout expiry |
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112 cyg_bool wait( cyg_tick_count timeout ); |
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113 |
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114 #endif |
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115 |
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116 }; |
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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 #endif // ifndef CYGONCE_KERNEL_MUTEX_HXX |
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122 // EOF mutex.hxx |
