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Diffstat (limited to 'ext/systemc/src/sysc/communication/sc_semaphore.cpp')
| -rw-r--r-- | ext/systemc/src/sysc/communication/sc_semaphore.cpp | 148 |
1 files changed, 148 insertions, 0 deletions
diff --git a/ext/systemc/src/sysc/communication/sc_semaphore.cpp b/ext/systemc/src/sysc/communication/sc_semaphore.cpp new file mode 100644 index 000000000..d90424431 --- /dev/null +++ b/ext/systemc/src/sysc/communication/sc_semaphore.cpp @@ -0,0 +1,148 @@ +/***************************************************************************** + + 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. + + *****************************************************************************/ + +/***************************************************************************** + + 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! |