1/***************************************************************************** 2 3 Licensed to Accellera Systems Initiative Inc. (Accellera) under one or 4 more contributor license agreements. See the NOTICE file distributed 5 with this work for additional information regarding copyright ownership. 6 Accellera licenses this file to you under the Apache License, Version 2.0 7 (the "License"); you may not use this file except in compliance with the 8 License. You may obtain a copy of the License at 9 10 http://www.apache.org/licenses/LICENSE-2.0 11 12 Unless required by applicable law or agreed to in writing, software 13 distributed under the License is distributed on an "AS IS" BASIS, 14 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or 15 implied. See the License for the specific language governing 16 permissions and limitations under the License. 17 18 *****************************************************************************/ 19 20/***************************************************************************** 21 22 sc_semaphore.h -- The sc_semaphore primitive channel class. 23 24 Original Author: Martin Janssen, Synopsys, Inc., 2001-05-21 25 26 CHANGE LOG IS AT THE END OF THE FILE 27 *****************************************************************************/ 28 29#ifndef SC_SEMAPHORE_H 30#define SC_SEMAPHORE_H 31 32 33#include "sysc/kernel/sc_event.h" 34#include "sysc/kernel/sc_object.h" 35#include "sysc/communication/sc_semaphore_if.h" 36 37namespace sc_core { 38 39// ---------------------------------------------------------------------------- 40// CLASS : sc_semaphore 41// 42// The sc_semaphore primitive channel class. 43// ---------------------------------------------------------------------------- 44 45class sc_semaphore 46: public sc_semaphore_if, 47 public sc_object 48{ 49public: 50 51 // constructors 52 53 explicit sc_semaphore( int init_value_ ); 54 sc_semaphore( const char* name_, int init_value_ ); 55 56 57 // interface methods 58 59 // lock (take) the semaphore, block if not available 60 virtual int wait(); 61 62 // lock (take) the semaphore, return -1 if not available 63 virtual int trywait(); 64 65 // unlock (give) the semaphore 66 virtual int post(); 67 68 // get the value of the semaphore 69 virtual int get_value() const 70 { return m_value; } 71 72 virtual const char* kind() const 73 { return "sc_semaphore"; } 74 75protected: 76 77 // support methods 78 79 bool in_use() const 80 { return ( m_value <= 0 ); } 81 82 83 // error reporting 84 void report_error( const char* id, const char* add_msg = 0 ) const; 85 86protected: 87 88 sc_event m_free; // event to block on when m_value is negative 89 int m_value; // current value of the semaphore 90 91private: 92 93 // disabled 94 sc_semaphore( const sc_semaphore& ); 95 sc_semaphore& operator = ( const sc_semaphore& ); 96}; 97 98} // namespace sc_core 99 100//$Log: sc_semaphore.h,v $ 101//Revision 1.4 2011/08/26 20:45:42 acg 102// Andy Goodrich: moved the modification log to the end of the file to 103// eliminate source line number skew when check-ins are done. 104// 105//Revision 1.3 2011/02/18 20:23:45 acg 106// Andy Goodrich: Copyright update. 107// 108//Revision 1.2 2010/11/02 16:31:01 acg 109// Andy Goodrich: changed object derivation to use sc_object rather than 110// sc_prim_channel as the parent class. 111// 112//Revision 1.1.1.1 2006/12/15 20:20:04 acg 113//SystemC 2.3 114// 115//Revision 1.4 2006/11/28 20:30:49 acg 116// Andy Goodrich: updated from 2.2 source. sc_event_queue constructors 117// collapsed into a single constructor with an optional argument to get 118// the sc_module_name stack done correctly. Class name prefixing added 119// to sc_semaphore calls to wait() to keep gcc 4.x happy. 120// 121//Revision 1.2 2006/01/03 23:18:26 acg 122//Changed copyright to include 2006. 123// 124//Revision 1.1.1.1 2005/12/19 23:16:43 acg 125//First check in of SystemC 2.1 into its own archive. 126// 127//Revision 1.9 2005/06/10 22:43:55 acg 128//Added CVS change log annotation. 129// 130 131#endif 132 133// Taf! 134