thread.cpp
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/* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
/*
* Main authors:
* Christian Schulte <schulte@gecode.org>
*
* Copyright:
* Christian Schulte, 2009
*
* This file is part of Gecode, the generic constraint
* development environment:
* http://www.gecode.org
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
*/
#include <gecode/support.hh>
namespace Gecode { namespace Support {
/*
* Threads
*/
Mutex* Thread::m(void) {
static Mutex* m = new Mutex;
return m;
}
Thread::Run* Thread::idle = NULL;
void
Thread::Run::exec(void) {
while (true) {
// Execute runnable
{
Runnable* e;
m.acquire();
GECODE_ASSUME(r != NULL);
e=r; r=NULL;
m.release();
assert(e != NULL);
e->run();
if (e->todelete()) {
Terminator* t = e->terminator();
delete e;
if (t)
t->terminated();
}
}
// Put into idle stack
Thread::m()->acquire();
n=Thread::idle; Thread::idle=this;
Thread::m()->release();
// Wait for next runnable
e.wait();
}
}
}}
// STATISTICS: support-any
Gecode::Support::Mutex
A mutex for mutual exclausion among several threads.
Definition thread.hpp:96
Gecode::Support::Mutex::release
void release(void)
Release the mutex.
Definition none.hpp:48
Gecode::Support::Mutex::acquire
void acquire(void)
Acquire the mutex and possibly block.
Definition none.hpp:42
Gecode::Support::Runnable
An interface for objects that can be run by a thread.
Definition thread.hpp:264
Gecode::Support::Terminator
An interface for objects that can be called after a thread has terminated (after running the thread's...
Definition thread.hpp:251
Gecode::Support::Terminator::terminated
virtual void terminated(void)=0
The function that is called when the thread has terminated.
Gecode::Support::Thread::Run
A real thread.
Definition thread.hpp:299
Gecode::Support::Thread::Run::exec
void exec(void)
Infinite loop for execution.
Definition thread.cpp:50
Gecode::Support::Thread::Run::e
Event e
Event to wait for next runnable object to execute.
Definition thread.hpp:306
Gecode::Support::Thread::Run::n
Run * n
Next idle thread.
Definition thread.hpp:302
Gecode::Support::Thread::Run::r
Runnable * r
Runnable object to execute.
Definition thread.hpp:304
Gecode::Support::Thread::Run::m
Mutex m
Mutex for synchronization.
Definition thread.hpp:308
Gecode::Support::Thread::idle
static Run * idle
Idle runners.
Definition thread.hpp:323
Gecode::Support::Thread::m
static Mutex * m(void)
Mutex for synchronization.
Definition thread.cpp:42
Gecode::Support
Support algorithms and datastructures
Gecode
Gecode toplevel namespace
GECODE_ASSUME
#define GECODE_ASSUME(p)
Assert certain property.
Definition macros.hpp:114
support.hh