| /***************************************************************************** |
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| Licensed to Accellera Systems Initiative Inc. (Accellera) under one or |
| more contributor license agreements. See the NOTICE file distributed |
| with this work for additional information regarding copyright ownership. |
| Accellera licenses this file to you under the Apache License, Version 2.0 |
| (the "License"); you may not use this file except in compliance with the |
| License. You may obtain a copy of the License at |
| |
| http://www.apache.org/licenses/LICENSE-2.0 |
| |
| Unless required by applicable law or agreed to in writing, software |
| distributed under the License is distributed on an "AS IS" BASIS, |
| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or |
| implied. See the License for the specific language governing |
| permissions and limitations under the License. |
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| *****************************************************************************/ |
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| /***************************************************************************** |
| |
| sc_semaphore.cpp -- The sc_semaphore primitive channel class. |
| |
| Original Author: Martin Janssen, Synopsys, Inc., 2001-05-21 |
| |
| CHANGE LOG IS AT THE END OF THE FILE |
| *****************************************************************************/ |
| |
| #include "sysc/communication/sc_communication_ids.h" |
| #include "sysc/communication/sc_semaphore.h" |
| #include "sysc/kernel/sc_simcontext.h" |
| #include "sysc/kernel/sc_wait.h" |
| |
| namespace sc_core { |
| |
| // ---------------------------------------------------------------------------- |
| // CLASS : sc_semaphore |
| // |
| // The sc_semaphore primitive channel class. |
| // ---------------------------------------------------------------------------- |
| |
| // error reporting |
| |
| void |
| sc_semaphore::report_error( const char* id, const char* add_msg ) const |
| { |
| char msg[BUFSIZ]; |
| if( add_msg != 0 ) { |
| std::sprintf( msg, "%s: semaphore '%s'", add_msg, name() ); |
| } else { |
| std::sprintf( msg, "semaphore '%s'", name() ); |
| } |
| SC_REPORT_ERROR( id, msg ); |
| } |
| |
| |
| // constructors |
| |
| sc_semaphore::sc_semaphore( int init_value_ ) |
| : sc_object( sc_gen_unique_name( "semaphore" ) ), |
| m_free( (std::string(SC_KERNEL_EVENT_PREFIX)+"_free_event").c_str() ), |
| m_value( init_value_ ) |
| { |
| if( m_value < 0 ) { |
| report_error( SC_ID_INVALID_SEMAPHORE_VALUE_ ); |
| } |
| } |
| |
| sc_semaphore::sc_semaphore( const char* name_, int init_value_ ) |
| : sc_object( name_ ), |
| m_free( (std::string(SC_KERNEL_EVENT_PREFIX)+"_free_event").c_str() ), |
| m_value( init_value_ ) |
| { |
| if( m_value < 0 ) { |
| report_error( SC_ID_INVALID_SEMAPHORE_VALUE_ ); |
| } |
| } |
| |
| |
| // interface methods |
| |
| // lock (take) the semaphore, block if not available |
| |
| int |
| sc_semaphore::wait() |
| { |
| while( in_use() ) { |
| sc_core::wait( m_free, sc_get_curr_simcontext() ); |
| } |
| -- m_value; |
| return 0; |
| } |
| |
| |
| // lock (take) the semaphore, return -1 if not available |
| |
| int |
| sc_semaphore::trywait() |
| { |
| if( in_use() ) { |
| return -1; |
| } |
| -- m_value; |
| return 0; |
| } |
| |
| |
| // unlock (give) the semaphore |
| |
| int |
| sc_semaphore::post() |
| { |
| ++m_value; |
| m_free.notify(); |
| return 0; |
| } |
| |
| } // namespace sc_core |
| |
| // $Log: sc_semaphore.cpp,v $ |
| // Revision 1.5 2011/08/26 20:45:42 acg |
| // Andy Goodrich: moved the modification log to the end of the file to |
| // eliminate source line number skew when check-ins are done. |
| // |
| // Revision 1.4 2011/03/23 16:17:22 acg |
| // Andy Goodrich: hide the sc_events that are kernel related. |
| // |
| // Revision 1.3 2011/02/18 20:23:45 acg |
| // Andy Goodrich: Copyright update. |
| // |
| // Revision 1.2 2010/11/02 16:31:01 acg |
| // Andy Goodrich: changed object derivation to use sc_object rather than |
| // sc_prim_channel as the parent class. |
| // |
| // Revision 1.1.1.1 2006/12/15 20:20:04 acg |
| // SystemC 2.3 |
| // |
| // Revision 1.6 2006/11/28 20:30:49 acg |
| // Andy Goodrich: updated from 2.2 source. sc_event_queue constructors |
| // collapsed into a single constructor with an optional argument to get |
| // the sc_module_name stack done correctly. Class name prefixing added |
| // to sc_semaphore calls to wait() to keep gcc 4.x happy. |
| // |
| // Revision 1.3 2006/01/13 18:47:42 acg |
| // Added $Log command so that CVS comments are reproduced in the source. |
| // |
| |
| // Taf! |