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thread.cpp
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1 /* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
2 /*
3  * Main authors:
4  * Christian Schulte <schulte@gecode.org>
5  *
6  * Copyright:
7  * Christian Schulte, 2009
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10  * $Date: 2012-09-27 08:00:33 +0200 (Thu, 27 Sep 2012) $ by $Author: tack $
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37 
38 #include <gecode/support.hh>
39 
40 namespace Gecode { namespace Support {
41 
42  /*
43  * Threads
44  */
45 
46  Mutex* Thread::m(void) {
47  static Mutex* m = new Mutex;
48  return m;
49  }
50 
51  Thread::Run* Thread::idle = NULL;
52 
53  void
55  while (true) {
56  // Execute runnable
57  {
58  Runnable* e;
59  m.acquire();
60  e=r; r=NULL;
61  m.release();
62  assert(e != NULL);
63  e->run();
64  delete e;
65  }
66  // Put into idle stack
67  Thread::m()->acquire();
68  n=Thread::idle; Thread::idle=this;
69  Thread::m()->release();
70  // Wait for next runnable
71  e.wait();
72  }
73  }
74 
75 }}
76 
77 // STATISTICS: support-any
Mutex m
Mutex for synchronization.
Definition: thread.hpp:291
An interface for objects that can be run by a thread.
Definition: thread.hpp:258
void acquire(void)
Acquire the mutex and possibly block.
Definition: none.hpp:46
Runnable * r
Runnable object to execute.
Definition: thread.hpp:287
A mutex for mutual exclausion among several threads.
Definition: thread.hpp:99
void release(void)
Release the mutex.
Definition: none.hpp:52
virtual void run(void)=0
The function that is executed when the thread starts.
void exec(void)
Infinite loop for execution.
Definition: thread.cpp:54
static Run * idle
Idle runners.
Definition: thread.hpp:306
Run * n
Next idle thread.
Definition: thread.hpp:285
Event e
Event to wait for next runnable object to execute.
Definition: thread.hpp:289
static Mutex * m(void)
Mutex for synchronization.
Definition: thread.cpp:46
Gecode toplevel namespace
void wait(void)
Wait until the event becomes signalled.
Definition: none.hpp:65