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Diffstat (limited to 'ext/systemc/src/sysc/communication/sc_mutex.cpp')
| -rw-r--r-- | ext/systemc/src/sysc/communication/sc_mutex.cpp | 140 |
1 files changed, 140 insertions, 0 deletions
diff --git a/ext/systemc/src/sysc/communication/sc_mutex.cpp b/ext/systemc/src/sysc/communication/sc_mutex.cpp new file mode 100644 index 000000000..d2c43244c --- /dev/null +++ b/ext/systemc/src/sysc/communication/sc_mutex.cpp @@ -0,0 +1,140 @@ +/***************************************************************************** + + 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_mutex.cpp -- The sc_mutex 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_mutex.h" +#include "sysc/kernel/sc_simcontext.h" + +namespace sc_core { + +// ---------------------------------------------------------------------------- +// CLASS : sc_mutex +// +// The sc_mutex primitive channel class. +// ---------------------------------------------------------------------------- + +// constructors + +sc_mutex::sc_mutex() +: sc_object( sc_gen_unique_name( "mutex" ) ), + m_owner( 0 ), + m_free( (std::string(SC_KERNEL_EVENT_PREFIX)+"_free_event").c_str() ) +{} + +sc_mutex::sc_mutex( const char* name_ ) +: sc_object( name_ ), + m_owner( 0 ), + m_free( (std::string(SC_KERNEL_EVENT_PREFIX)+"_free_event").c_str() ) +{} + + +// destructor + +sc_mutex::~sc_mutex() +{} + +// interface methods + +// blocks until mutex could be locked + +int +sc_mutex::lock() +{ + if ( m_owner == sc_get_current_process_b()) return 0; + while( in_use() ) { + sc_core::wait( m_free, sc_get_curr_simcontext() ); + } + m_owner = sc_get_current_process_b(); + return 0; +} + + +// returns -1 if mutex could not be locked + +int +sc_mutex::trylock() +{ + if ( m_owner == sc_get_current_process_b()) return 0; + if( in_use() ) { + return -1; + } + m_owner = sc_get_current_process_b(); + return 0; +} + + +// returns -1 if mutex was not locked by caller + +int +sc_mutex::unlock() +{ + if( m_owner != sc_get_current_process_b() ) { + return -1; + } + m_owner = 0; + m_free.notify(); + return 0; +} + +} // namespace sc_core + +// $Log: sc_mutex.cpp,v $ +// Revision 1.7 2011/08/26 20:45:40 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 1.6 2011/03/28 13:02:29 acg +// Andy Goodrich: removed sc_event in sc_mutex class from the object +// hierarchy since it is considered a "kernel" event. +// +// Revision 1.5 2011/02/18 20:23:45 acg +// Andy Goodrich: Copyright update. +// +// Revision 1.4 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 1.3 2008/11/13 15:29:46 acg +// David C. Black, ESLX, Inc: lock & trylock now allow owner to apply +// lock more than once without incident. Previous behavior locked up the +// owning process. +// +// Revision 1.2 2008/05/20 16:46:18 acg +// Andy Goodrich: added checks for multiple writers. +// +// Revision 1.1.1.1 2006/12/15 20:20:04 acg +// SystemC 2.3 +// +// Revision 1.4 2006/03/21 00:00:27 acg +// Andy Goodrich: changed name of sc_get_current_process_base() to be +// sc_get_current_process_b() since its returning an sc_process_b instance. +// +// Revision 1.3 2006/01/13 18:47:42 acg +// Added $Log command so that CVS comments are reproduced in the source. +// + +// Taf! |