/usr/lib/gcc/x86_64-linux-gnu/6/include/d/core/sync/barrier.d is in libgphobos-6-dev 6.4.0-17ubuntu1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 | /**
* The barrier module provides a primitive for synchronizing the progress of
* a group of threads.
*
* Copyright: Copyright Sean Kelly 2005 - 2009.
* License: $(LINK2 http://www.boost.org/LICENSE_1_0.txt, Boost License 1.0)
* Authors: Sean Kelly
* Source: $(DRUNTIMESRC core/sync/_barrier.d)
*/
/* Copyright Sean Kelly 2005 - 2009.
* Distributed under the Boost Software License, Version 1.0.
* (See accompanying file LICENSE or copy at
* http://www.boost.org/LICENSE_1_0.txt)
*/
module core.sync.barrier;
public import core.sync.exception;
private import core.sync.condition;
private import core.sync.mutex;
version( Posix )
{
private import core.stdc.errno;
private import core.sys.posix.pthread;
}
////////////////////////////////////////////////////////////////////////////////
// Barrier
//
// void wait();
////////////////////////////////////////////////////////////////////////////////
/**
* This class represents a barrier across which threads may only travel in
* groups of a specific size.
*/
class Barrier
{
////////////////////////////////////////////////////////////////////////////
// Initialization
////////////////////////////////////////////////////////////////////////////
/**
* Initializes a barrier object which releases threads in groups of limit
* in size.
*
* Params:
* limit = The number of waiting threads to release in unison.
*
* Throws:
* SyncError on error.
*/
this( uint limit )
in
{
assert( limit > 0 );
}
body
{
m_lock = new Mutex;
m_cond = new Condition( m_lock );
m_group = 0;
m_limit = limit;
m_count = limit;
}
////////////////////////////////////////////////////////////////////////////
// General Actions
////////////////////////////////////////////////////////////////////////////
/**
* Wait for the pre-determined number of threads and then proceed.
*
* Throws:
* SyncError on error.
*/
void wait()
{
synchronized( m_lock )
{
uint group = m_group;
if( --m_count == 0 )
{
m_group++;
m_count = m_limit;
m_cond.notifyAll();
}
while( group == m_group )
m_cond.wait();
}
}
private:
Mutex m_lock;
Condition m_cond;
uint m_group;
uint m_limit;
uint m_count;
}
////////////////////////////////////////////////////////////////////////////////
// Unit Tests
////////////////////////////////////////////////////////////////////////////////
version( unittest )
{
private import core.thread;
unittest
{
int numThreads = 10;
auto barrier = new Barrier( numThreads );
auto synInfo = new Object;
int numReady = 0;
int numPassed = 0;
void threadFn()
{
synchronized( synInfo )
{
++numReady;
}
barrier.wait();
synchronized( synInfo )
{
++numPassed;
}
}
auto group = new ThreadGroup;
for( int i = 0; i < numThreads; ++i )
{
group.create( &threadFn );
}
group.joinAll();
assert( numReady == numThreads && numPassed == numThreads );
}
}
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