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concurrent_monitor.cpp
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137 lines (125 loc) · 4.64 KB
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/*
Copyright 2005-2014 Intel Corporation. All Rights Reserved.
This file is part of Threading Building Blocks. Threading Building Blocks is free software;
you can redistribute it and/or modify it under the terms of the GNU General Public License
version 2 as published by the Free Software Foundation. Threading Building Blocks is
distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the
implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
See the GNU General Public License for more details. You should have received a copy of
the GNU General Public License along with Threading Building Blocks; if not, write to the
Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
As a special exception, you may use this file as part of a free software library without
restriction. Specifically, if other files instantiate templates or use macros or inline
functions from this file, or you compile this file and link it with other files to produce
an executable, this file does not by itself cause the resulting executable to be covered
by the GNU General Public License. This exception does not however invalidate any other
reasons why the executable file might be covered by the GNU General Public License.
*/
#include "concurrent_monitor.h"
namespace tbb {
namespace internal {
void concurrent_monitor::thread_context::init() {
new (sema.begin()) binary_semaphore;
ready = true;
}
concurrent_monitor::~concurrent_monitor() {
abort_all();
__TBB_ASSERT( waitset_ec.empty(), "waitset not empty?" );
}
void concurrent_monitor::prepare_wait( thread_context& thr, uintptr_t ctx ) {
if( !thr.ready )
thr.init();
// this is good place to pump previous spurious wakeup
else if( thr.spurious ) {
thr.spurious = false;
thr.semaphore().P();
}
thr.context = ctx;
thr.in_waitset = true;
{
tbb::spin_mutex::scoped_lock l( mutex_ec );
__TBB_store_relaxed( thr.epoch, __TBB_load_relaxed(epoch) );
waitset_ec.add( (waitset_t::node_t*)&thr );
}
atomic_fence();
}
void concurrent_monitor::cancel_wait( thread_context& thr ) {
// spurious wakeup will be pumped in the following prepare_wait()
thr.spurious = true;
// try to remove node from waitset
bool th_in_waitset = thr.in_waitset;
if( th_in_waitset ) {
tbb::spin_mutex::scoped_lock l( mutex_ec );
if (thr.in_waitset) {
// successfully removed from waitset,
// so there will be no spurious wakeup
thr.in_waitset = false;
thr.spurious = false;
waitset_ec.remove( (waitset_t::node_t&)thr );
}
}
}
void concurrent_monitor::notify_one_relaxed() {
if( waitset_ec.empty() )
return;
waitset_node_t* n;
const waitset_node_t* end = waitset_ec.end();
{
tbb::spin_mutex::scoped_lock l( mutex_ec );
__TBB_store_relaxed( epoch, __TBB_load_relaxed(epoch) + 1 );
n = waitset_ec.front();
if( n!=end ) {
waitset_ec.remove( *n );
to_thread_context(n)->in_waitset = false;
}
}
if( n!=end )
to_thread_context(n)->semaphore().V();
}
void concurrent_monitor::notify_all_relaxed() {
if( waitset_ec.empty() )
return;
dllist_t temp;
const waitset_node_t* end;
{
tbb::spin_mutex::scoped_lock l( mutex_ec );
__TBB_store_relaxed( epoch, __TBB_load_relaxed(epoch) + 1 );
waitset_ec.flush_to( temp );
end = temp.end();
for( waitset_node_t* n=temp.front(); n!=end; n=n->next )
to_thread_context(n)->in_waitset = false;
}
waitset_node_t* nxt;
for( waitset_node_t* n=temp.front(); n!=end; n=nxt ) {
nxt = n->next;
to_thread_context(n)->semaphore().V();
}
#if TBB_USE_ASSERT
temp.clear();
#endif
}
void concurrent_monitor::abort_all_relaxed() {
if( waitset_ec.empty() )
return;
dllist_t temp;
const waitset_node_t* end;
{
tbb::spin_mutex::scoped_lock l( mutex_ec );
__TBB_store_relaxed( epoch, __TBB_load_relaxed(epoch) + 1 );
waitset_ec.flush_to( temp );
end = temp.end();
for( waitset_node_t* n=temp.front(); n!=end; n=n->next )
to_thread_context(n)->in_waitset = false;
}
waitset_node_t* nxt;
for( waitset_node_t* n=temp.front(); n!=end; n=nxt ) {
nxt = n->next;
to_thread_context(n)->aborted = true;
to_thread_context(n)->semaphore().V();
}
#if TBB_USE_ASSERT
temp.clear();
#endif
}
} // namespace internal
} // namespace tbb