| 1 | Unit Semaphores;
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| 2 |
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| 3 | Interface
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| 4 |
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| 5 | Uses
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| 6 | {$ifdef os2}
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| 7 | BseDos;
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| 8 | {$else}
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| 9 | Windows;
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| 10 | {$endif}
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| 11 |
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| 12 | Type
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| 13 | {$ifdef win32}
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| 14 | Hev = THandle;
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| 15 | HMtx = THandle;
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| 16 | {$endif}
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| 17 |
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| 18 | TEventSemaphore = class
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| 19 | protected
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| 20 | _Handle: HEv;
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| 21 | _Name: string;
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| 22 | _AlreadyExisted: boolean;
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| 23 | public
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| 24 | Constructor Create;
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| 25 | Constructor CreateNamed( const Name: string );
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| 26 | Destructor Destroy; override;
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| 27 |
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| 28 | procedure Post;
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| 29 | procedure Reset;
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| 30 | function IsPosted: boolean;
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| 31 | procedure Wait;
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| 32 |
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| 33 | property Handle: HEv read _Handle;
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| 34 | end;
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| 35 |
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| 36 | TWaitType = ( wtAny, wtAll );
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| 37 |
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| 38 | {$ifdef os2}
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| 39 | TSemaphoreArray = Array[ 0..0 ] of SEMRECORD;
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| 40 | TPSemaphoreArray = ^TSemaphoreArray;
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| 41 | {$else}
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| 42 | TSemaphoreArray = Array[ 0..0 ] of TEventSemaphore;
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| 43 | TPSemaphoreArray = ^TSemaphoreArray;
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| 44 | {$endif}
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| 45 |
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| 46 | TMultiWaitSemaphore = class
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| 47 | protected
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| 48 | _WaitType: TWaitType;
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| 49 | {$ifdef os2}
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| 50 | _Handle: HMux;
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| 51 | _PSemaphoreArray: TPSemaphoreArray;
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| 52 | {$else}
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| 53 | _PSemaphoreHandleArray: PWOHandleArray;
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| 54 | _PSemaphoreArray: TPSemaphoreArray;
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| 55 | {$endif}
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| 56 | _SemaphoreCount: longint;
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| 57 | public
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| 58 | Constructor Create( WaitType: TWaitType;
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| 59 | Semaphores: array of TEventSemaphore );
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| 60 | Destructor Destroy; Override;
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| 61 |
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| 62 | // Returns which event semaphore was posted
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| 63 | Function Wait: TEventSemaphore;
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| 64 | end;
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| 65 |
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| 66 | TMutex = class
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| 67 | protected
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| 68 | _Handle: HMtx;
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| 69 | public
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| 70 | constructor Create;
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| 71 | constructor CreateNamed( const Name: string );
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| 72 | destructor Destroy; override;
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| 73 |
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| 74 | procedure Get;
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| 75 | procedure Release;
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| 76 | end;
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| 77 |
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| 78 | Implementation
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| 79 |
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| 80 | // Turn off range checking since we are playing with dynamic arrays
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| 81 | {$R-}
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| 82 |
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| 83 | Constructor TEventSemaphore.Create;
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| 84 | begin
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| 85 | {$ifdef os2}
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| 86 | DosCreateEventSem( nil, // unnamed
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| 87 | _Handle,
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| 88 | 0, // not shared
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| 89 | false );
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| 90 | {$else}
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| 91 | _Handle:= CreateEvent( nil, // no security
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| 92 | true, // manual reset please
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| 93 | false, // initially cleared
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| 94 | nil ); // no name
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| 95 | {$endif}
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| 96 | end;
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| 97 |
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| 98 | Constructor TEventSemaphore.CreateNamed( const Name: string );
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| 99 | {$ifdef os2}
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| 100 | var
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| 101 | CName: Cstring;
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| 102 | {$endif}
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| 103 | begin
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| 104 | _Name := Name;
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| 105 | {$ifdef os2}
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| 106 | CName := Name;
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| 107 | DosCreateEventSem( CName, // unnamed
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| 108 | _Handle,
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| 109 | DC_SEM_SHARED, // shared
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| 110 | false );
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| 111 | {$else}
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| 112 | _Handle:= CreateEvent( nil, // no security
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| 113 | true, // manual reset please
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| 114 | false, // initially cleared
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| 115 | PChar( name ) ); // no name
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| 116 | {$endif}
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| 117 | end;
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| 118 |
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| 119 | Destructor TEventSemaphore.Destroy;
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| 120 | begin
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| 121 | {$ifdef os2}
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| 122 | DosCloseEventSem( _Handle );
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| 123 | {$else}
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| 124 | CloseHandle( _Handle );
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| 125 | {$endif}
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| 126 | end;
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| 127 |
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| 128 | procedure TEventSemaphore.Post;
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| 129 | begin
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| 130 | {$ifdef os2}
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| 131 | DosPostEventSem( _Handle );
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| 132 | {$else}
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| 133 | SetEvent( _Handle );
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| 134 | {$endif}
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| 135 | end;
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| 136 |
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| 137 | procedure TEventSemaphore.Reset;
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| 138 | {$ifdef os2}
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| 139 | var
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| 140 | PostCount: Longword;
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| 141 | {$endif}
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| 142 | begin
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| 143 | {$ifdef os2}
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| 144 | DosResetEventSem( _Handle, PostCount );
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| 145 | {$else}
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| 146 | ResetEvent( _Handle);
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| 147 | {$endif}
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| 148 | end;
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| 149 |
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| 150 | function TEventSemaphore.IsPosted: boolean;
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| 151 | {$ifdef os2}
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| 152 | var
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| 153 | PostCount: Longword;
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| 154 | {$endif}
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| 155 | begin
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| 156 | {$ifdef os2}
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| 157 | DosQueryEventSem( _Handle, PostCount );
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| 158 | Result:= ( PostCount > 0 );
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| 159 | {$else}
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| 160 | if WaitForSingleObject( _Handle,
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| 161 | 0 ) // return immediately...
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| 162 | = WAIT_OBJECT_0 then
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| 163 | Result:= true
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| 164 | else
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| 165 | Result:= false;
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| 166 | // ? doesn't seem to be possible...
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| 167 | {$endif}
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| 168 | end;
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| 169 |
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| 170 | procedure TEventSemaphore.Wait;
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| 171 | begin
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| 172 | {$ifdef os2}
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| 173 | DosWaitEventSem( Handle, SEM_INDEFINITE_WAIT );
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| 174 | {$else}
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| 175 | WaitForSingleObject( _Handle,
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| 176 | INFINITE );
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| 177 | {$endif}
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| 178 | end;
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| 179 |
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| 180 | Constructor TMultiWaitSemaphore.Create( WaitType: TWaitType;
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| 181 | Semaphores: array of TEventSemaphore );
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| 182 | var
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| 183 | i: longint;
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| 184 | SemIndex: longint;
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| 185 |
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| 186 | {$ifdef os2}
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| 187 | flAttr: Longword;
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| 188 | {$endif}
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| 189 |
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| 190 | begin
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| 191 | _WaitType:= WaitType;
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| 192 |
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| 193 | _SemaphoreCount:= High( Semaphores ) - Low( Semaphores ) + 1;
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| 194 | {$ifdef os2}
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| 195 | GetMem( _PSemaphoreArray, Sizeof( SEMRECORD ) * _SemaphoreCount );
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| 196 | {$else}
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| 197 | GetMem( _PSemaphoreHandleArray, Sizeof( THandle ) * _SemaphoreCount );
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| 198 | GetMem( _PSemaphoreArray, Sizeof( TEventSemaphore ) * _SemaphoreCount );
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| 199 | {$endif}
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| 200 |
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| 201 | for i:= 0 to _SemaphoreCount - 1 do
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| 202 | begin
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| 203 | SemIndex:= i + Low( Semaphores );
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| 204 | {$ifdef os2}
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| 205 | _PSemaphoreArray^[ i ].hSemCur:= Semaphores[ SemIndex ].Handle;
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| 206 | _PSemaphoreArray^[ i ].ulUser:= longword( Semaphores[ SemIndex ] );
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| 207 | {$else}
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| 208 | _PSemaphoreHandleArray^[ i ]:= Semaphores[ SemIndex ].Handle;
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| 209 | _PSemaphoreArray^[ i ]:= Semaphores[ SemIndex ];
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| 210 | {$endif}
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| 211 | end;
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| 212 |
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| 213 | {$ifdef os2}
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| 214 | case _WaitType of
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| 215 | wtAll:
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| 216 | flAttr:= DCMW_WAIT_ALL;
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| 217 | wtAny:
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| 218 | flAttr:= DCMW_WAIT_ANY;
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| 219 | end;
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| 220 |
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| 221 | DosCreateMuxWaitSem( nil,
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| 222 | _Handle,
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| 223 | _SemaphoreCount,
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| 224 | _PSemaphoreArray^,
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| 225 | flAttr );
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| 226 | {$endif}
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| 227 | // nothing to do for Win32...
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| 228 |
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| 229 | end;
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| 230 |
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| 231 | Destructor TMultiWaitSemaphore.Destroy;
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| 232 | begin
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| 233 | {$ifdef os2}
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| 234 | DosCloseMuxWaitSem( _Handle );
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| 235 | FreeMem( _PSemaphoreArray, Sizeof( SEMRECORD ) * _SemaphoreCount );
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| 236 | {$else}
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| 237 | FreeMem( _PSemaphoreArray, Sizeof( THandle ) * _SemaphoreCount );
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| 238 | {$endif}
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| 239 | end;
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| 240 |
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| 241 | Function TMultiWaitSemaphore.Wait: TEventSemaphore;
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| 242 | var
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| 243 | WhichSem: LongWord;
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| 244 | {$ifdef win32}
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| 245 | WaitAll: BOOL;
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| 246 | {$endif}
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| 247 | begin
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| 248 | {$ifdef os2}
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| 249 | DosWaitMuxWaitSem( _Handle, SEM_INDEFINITE_WAIT, WhichSem );
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| 250 | Result:= TEventSemaphore( WhichSem );
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| 251 | {$else}
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| 252 | WaitAll:= ( _WaitType = wtAll );
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| 253 |
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| 254 | WhichSem:=
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| 255 | WaitForMultipleObjects( _SemaphoreCount,
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| 256 | _PSemaphoreHandleArray,
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| 257 | WaitAll,
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| 258 | INFINITE )
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| 259 | - WAIT_OBJECT_0;
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| 260 | Result:= _PSemaphoreArray^[ WhichSem ];
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| 261 | {$endif}
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| 262 |
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| 263 | end;
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| 264 |
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| 265 | constructor TMutex.Create;
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| 266 | begin
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| 267 | {$ifdef os2}
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| 268 | DosCreateMutexSem( nil, _Handle, 0, false );
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| 269 | {$else}
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| 270 | _Handle:= CreateMutex( nil, false, nil );
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| 271 | {$endif}
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| 272 | end;
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| 273 |
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| 274 | constructor TMutex.CreateNamed( const Name: string );
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| 275 | {$ifdef os2}
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| 276 | var
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| 277 | CName: Cstring;
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| 278 | {$endif}
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| 279 | begin
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| 280 | {$ifdef os2}
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| 281 | CName := Name;
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| 282 | DosCreateMutexSem( CName, _Handle, 0, false );
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| 283 | {$else}
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| 284 | _Handle:= CreateMutex( nil, false, PChar( Name ) );
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| 285 | {$endif}
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| 286 | end;
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| 287 |
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| 288 | destructor TMutex.Destroy;
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| 289 | begin
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| 290 | {$ifdef os2}
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| 291 | DosCloseMutexSem( _Handle );
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| 292 | {$else}
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| 293 | CloseHandle( _Handle );
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| 294 | {$endif}
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| 295 | inherited Destroy;
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| 296 | end;
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| 297 |
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| 298 | procedure TMutex.Get;
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| 299 | begin
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| 300 | {$ifdef os2}
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| 301 | DosRequestMutexSem( _Handle, SEM_INDEFINITE_WAIT );
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| 302 | {$else}
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| 303 | WaitForSingleObject( _Handle, INFINITE );
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| 304 | {$endif}
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| 305 | end;
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| 306 |
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| 307 | procedure TMutex.Release;
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| 308 | begin
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| 309 | {$ifdef os2}
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| 310 | DosReleaseMutexSem( _Handle );
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| 311 | {$else}
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| 312 | ReleaseMutex( _Handle );
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| 313 | {$endif}
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| 314 | end;
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| 315 |
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| 316 | Initialization
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| 317 | End.
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| 318 |
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