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thread.hpp
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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
8  *
9  * Last modified:
10  * $Date: 2013-07-01 06:38:48 +0200 (Mon, 01 Jul 2013) $ by $Author: tack $
11  * $Revision: 13740 $
12  *
13  * This file is part of Gecode, the generic constraint
14  * development environment:
15  * http://www.gecode.org
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37 
38 namespace Gecode { namespace Support {
39 
40  /*
41  * Runnable objects
42  */
43  forceinline void
44  Runnable::operator delete(void* p) {
45  heap.rfree(p);
46  }
47  forceinline void*
48  Runnable::operator new(size_t s) {
49  return heap.ralloc(s);
50  }
51 
52 
53  /*
54  * Mutexes
55  *
56  */
57  forceinline void*
58  Mutex::operator new(size_t s) {
59  return Gecode::heap.ralloc(s);
60  }
61 
62  forceinline void
63  Mutex::operator delete(void* p) {
65  }
66 
67 #if defined(GECODE_THREADS_OSX) || defined(GECODE_THREADS_PTHREADS_SPINLOCK)
68 
69  /*
70  * Fast mutexes
71  *
72  */
73  forceinline void*
74  FastMutex::operator new(size_t s) {
75  return Gecode::heap.ralloc(s);
76  }
77 
78  forceinline void
79  FastMutex::operator delete(void* p) {
81  }
82 
83 #endif
84 
85  /*
86  * Locks
87  */
89  Lock::Lock(Mutex& m0) : m(m0) {
90  m.acquire();
91  }
93  Lock::~Lock(void) {
94  m.release();
95  }
96 
97 
98  /*
99  * Threads
100  */
101  inline void
103  m.acquire();
104  r = r0;
105  m.release();
106  e.signal();
107  }
108  inline void
110  m()->acquire();
111  if (idle != NULL) {
112  Run* i = idle;
113  idle = idle->n;
114  m()->release();
115  i->run(r);
116  } else {
117  m()->release();
118  (void) new Run(r);
119  }
120  }
121  forceinline void
122  Thread::Run::operator delete(void* p) {
123  heap.rfree(p);
124  }
125  forceinline void*
126  Thread::Run::operator new(size_t s) {
127  return heap.ralloc(s);
128  }
129 
130 }}
131 
132 // STATISTICS: support-any
Mutex m
Mutex for synchronization.
Definition: thread.hpp:291
void rfree(void *p)
Free memory block starting at p.
Definition: heap.hpp:355
An interface for objects that can be run by a thread.
Definition: thread.hpp:258
static void run(Runnable *r)
Construct a new thread and run r.
Definition: thread.hpp:109
void acquire(void)
Acquire the mutex and possibly block.
Definition: none.hpp:46
void * ralloc(size_t s)
Allocate s bytes from heap.
Definition: heap.hpp:341
void signal(void)
Signal the event.
Definition: none.hpp:63
Runnable * r
Runnable object to execute.
Definition: thread.hpp:287
Heap heap
The single global heap.
Definition: heap.cpp:49
A mutex for mutual exclausion among several threads.
Definition: thread.hpp:99
void release(void)
Release the mutex.
Definition: none.hpp:52
void run(Runnable *r)
Run a runnable object.
Definition: thread.hpp:102
int p
Number of positive literals for node type.
Definition: bool-expr.cpp:236
Gecode::IntArgs i(4, 1, 2, 3, 4)
NNF * r
Right subtree.
Definition: bool-expr.cpp:246
Lock(Mutex &m0)
Enter lock.
Definition: thread.hpp:89
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
#define forceinline
Definition: config.hpp:132
static Mutex * m(void)
Mutex for synchronization.
Definition: thread.cpp:46
Gecode toplevel namespace
~Lock(void)
Leave lock.
Definition: thread.hpp:93