00001 /***************************************************************************** 00002 00003 The following code is derived, directly or indirectly, from the SystemC 00004 source code Copyright (c) 1996-2006 by all Contributors. 00005 All Rights reserved. 00006 00007 The contents of this file are subject to the restrictions and limitations 00008 set forth in the SystemC Open Source License Version 2.4 (the "License"); 00009 You may not use this file except in compliance with such restrictions and 00010 limitations. You may obtain instructions on how to receive a copy of the 00011 License at http://www.systemc.org/. Software distributed by Contributors 00012 under the License is distributed on an "AS IS" basis, WITHOUT WARRANTY OF 00013 ANY KIND, either express or implied. See the License for the specific 00014 language governing rights and limitations under the License. 00015 00016 *****************************************************************************/ 00017 00018 /***************************************************************************** 00019 00020 sc_semaphore.h -- The sc_semaphore primitive channel class. 00021 00022 Original Author: Martin Janssen, Synopsys, Inc., 2001-05-21 00023 00024 *****************************************************************************/ 00025 00026 /***************************************************************************** 00027 00028 MODIFICATION LOG - modifiers, enter your name, affiliation, date and 00029 changes you are making here. 00030 00031 Name, Affiliation, Date: 00032 Description of Modification: 00033 00034 *****************************************************************************/ 00035 //$Log: sc_semaphore.h,v $ 00036 //Revision 1.1.1.1 2006/12/15 20:31:35 acg 00037 //SystemC 2.2 00038 // 00039 //Revision 1.2 2006/01/03 23:18:26 acg 00040 //Changed copyright to include 2006. 00041 // 00042 //Revision 1.1.1.1 2005/12/19 23:16:43 acg 00043 //First check in of SystemC 2.1 into its own archive. 00044 // 00045 //Revision 1.9 2005/06/10 22:43:55 acg 00046 //Added CVS change log annotation. 00047 // 00048 00049 #ifndef SC_SEMAPHORE_H 00050 #define SC_SEMAPHORE_H 00051 00052 00053 #include "sysc/kernel/sc_event.h" 00054 #include "sysc/communication/sc_prim_channel.h" 00055 #include "sysc/communication/sc_semaphore_if.h" 00056 00057 namespace sc_core { 00058 00059 // ---------------------------------------------------------------------------- 00060 // CLASS : sc_semaphore 00061 // 00062 // The sc_semaphore primitive channel class. 00063 // ---------------------------------------------------------------------------- 00064 00065 class sc_semaphore 00066 : public sc_semaphore_if, 00067 public sc_prim_channel 00068 { 00069 public: 00070 00071 // constructors 00072 00073 explicit sc_semaphore( int init_value_ ); 00074 sc_semaphore( const char* name_, int init_value_ ); 00075 00076 00077 // interface methods 00078 00079 // lock (take) the semaphore, block if not available 00080 virtual int wait(); 00081 00082 // lock (take) the semaphore, return -1 if not available 00083 virtual int trywait(); 00084 00085 // unlock (give) the semaphore 00086 virtual int post(); 00087 00088 // get the value of the semaphore 00089 virtual int get_value() const 00090 { return m_value; } 00091 00092 virtual const char* kind() const 00093 { return "sc_semaphore"; } 00094 00095 protected: 00096 00097 // support methods 00098 00099 bool in_use() const 00100 { return ( m_value <= 0 ); } 00101 00102 00103 // error reporting 00104 void report_error( const char* id, const char* add_msg = 0 ) const; 00105 00106 protected: 00107 00108 sc_event m_free; // event to block on when m_value is negative 00109 int m_value; // current value of the semaphore 00110 00111 private: 00112 00113 // disabled 00114 sc_semaphore( const sc_semaphore& ); 00115 sc_semaphore& operator = ( const sc_semaphore& ); 00116 }; 00117 00118 } // namespace sc_core 00119 00120 #endif 00121 00122 // Taf!
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