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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  * This file is part of Gecode, the generic constraint
10  * development environment:
11  * http://www.gecode.org
12  *
13  * Permission is hereby granted, free of charge, to any person obtaining
14  * a copy of this software and associated documentation files (the
15  * "Software"), to deal in the Software without restriction, including
16  * without limitation the rights to use, copy, modify, merge, publish,
17  * distribute, sublicense, and/or sell copies of the Software, and to
18  * permit persons to whom the Software is furnished to do so, subject to
19  * the following conditions:
20  *
21  * The above copyright notice and this permission notice shall be
22  * included in all copies or substantial portions of the Software.
23  *
24  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
25  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
26  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
27  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
28  * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
29  * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
30  * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
31  *
32  */
33 
34 namespace Gecode { namespace Support {
35 
36  /*
37  * Runnable objects
38  */
41  : d(d0) {}
42  forceinline void
43  Runnable::todelete(bool d0) {
44  d=d0;
45  }
46  forceinline bool
47  Runnable::todelete(void) const {
48  return d;
49  }
50  forceinline void
51  Runnable::operator delete(void* p) {
52  heap.rfree(p);
53  }
54  forceinline void*
55  Runnable::operator new(size_t s) {
56  return heap.ralloc(s);
57  }
58 
59  /*
60  * Mutexes
61  *
62  */
63  forceinline void*
64  Mutex::operator new(size_t s) {
65  return Gecode::heap.ralloc(s);
66  }
67 
68  forceinline void
69  Mutex::operator delete(void* p) {
71  }
72 
73 #if ! ( defined(GECODE_THREADS_WINDOWS) || defined(GECODE_THREADS_OSX_UNFAIR) || !defined(GECODE_THREADS_PTHREADS_SPINLOCK) )
74 
75  /*
76  * Fast mutexes
77  *
78  */
79  forceinline void*
80  FastMutex::operator new(size_t s) {
81  return Gecode::heap.ralloc(s);
82  }
83 
84  forceinline void
85  FastMutex::operator delete(void* p) {
87  }
88 
89 #endif
90 
91  /*
92  * Locks
93  */
95  Lock::Lock(Mutex& m0) : m(m0) {
96  m.acquire();
97  }
99  Lock::~Lock(void) {
100  m.release();
101  }
102 
103 
104  /*
105  * Threads
106  */
107  inline void
109  m.acquire();
110  r = r0;
111  m.release();
112  e.signal();
113  }
114  inline void
116  m()->acquire();
117  if (idle != NULL) {
118  Run* i = idle;
119  idle = idle->n;
120  m()->release();
121  i->run(r);
122  } else {
123  m()->release();
124  (void) new Run(r);
125  }
126  }
127  forceinline void
128  Thread::Run::operator delete(void* p) {
129  heap.rfree(p);
130  }
131  forceinline void*
132  Thread::Run::operator new(size_t s) {
133  return heap.ralloc(s);
134  }
135 
136 }}
137 
138 // STATISTICS: support-any
int p
Number of positive literals for node type.
Definition: bool-expr.cpp:232
NNF * r
Right subtree.
Definition: bool-expr.cpp:242
void rfree(void *p)
Free memory block starting at p.
Definition: heap.hpp:371
void * ralloc(size_t s)
Allocate s bytes from heap.
Definition: heap.hpp:357
void signal(void)
Signal the event.
Definition: none.hpp:59
~Lock(void)
Leave lock.
Definition: thread.hpp:99
Lock(Mutex &m0)
Enter lock.
Definition: thread.hpp:95
A mutex for mutual exclausion among several threads.
Definition: thread.hpp:96
void release(void)
Release the mutex.
Definition: none.hpp:48
void acquire(void)
Acquire the mutex and possibly block.
Definition: none.hpp:42
An interface for objects that can be run by a thread.
Definition: thread.hpp:264
Runnable(bool d=true)
Initialize, d defines whether object is deleted when terminated.
Definition: thread.hpp:40
bool todelete(void) const
Return whether to be deleted upon termination.
Definition: thread.hpp:47
void run(Runnable *r)
Run a runnable object.
Definition: thread.hpp:108
Event e
Event to wait for next runnable object to execute.
Definition: thread.hpp:306
Run * n
Next idle thread.
Definition: thread.hpp:302
Runnable * r
Runnable object to execute.
Definition: thread.hpp:304
Mutex m
Mutex for synchronization.
Definition: thread.hpp:308
static Run * idle
Idle runners.
Definition: thread.hpp:323
static void run(Runnable *r)
Construct a new thread and run r.
Definition: thread.hpp:115
static Mutex * m(void)
Mutex for synchronization.
Definition: thread.cpp:42
Heap heap
The single global heap.
Definition: heap.cpp:44
Gecode::IntArgs i({1, 2, 3, 4})
Gecode::IntSet d(v, 7)
#define forceinline
Definition: config.hpp:192