/usr/include/stxxl/bits/common/switch.h is in libstxxl-dev 1.3.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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 | /***************************************************************************
* include/stxxl/bits/common/switch.h
*
* kind of semaphore
*
* Part of the STXXL. See http://stxxl.sourceforge.net
*
* Copyright (C) 2002 Roman Dementiev <dementiev@mpi-sb.mpg.de>
*
* Distributed under the Boost Software License, Version 1.0.
* (See accompanying file LICENSE_1_0.txt or copy at
* http://www.boost.org/LICENSE_1_0.txt)
**************************************************************************/
#ifndef STXXL_SWITCH_HEADER
#define STXXL_SWITCH_HEADER
#ifdef STXXL_BOOST_THREADS
#include <boost/thread/mutex.hpp>
#include <boost/thread/condition.hpp>
#else
#include <pthread.h>
#endif
#include <stxxl/bits/noncopyable.h>
#include <stxxl/bits/common/error_handling.h>
__STXXL_BEGIN_NAMESPACE
//#define onoff_switch Switch
class onoff_switch : private noncopyable
{
#ifdef STXXL_BOOST_THREADS
boost::mutex mutex;
boost::condition cond;
#else
pthread_mutex_t mutex;
pthread_cond_t cond;
#endif
bool _on;
public:
onoff_switch(bool flag = false) : _on(flag)
{
#ifndef STXXL_BOOST_THREADS
check_pthread_call(pthread_mutex_init(&mutex, NULL));
check_pthread_call(pthread_cond_init(&cond, NULL));
#endif
}
~onoff_switch()
{
#ifndef STXXL_BOOST_THREADS
int res = pthread_mutex_trylock(&mutex);
if (res == 0 || res == EBUSY) {
check_pthread_call(pthread_mutex_unlock(&mutex));
} else
stxxl_function_error(resource_error);
check_pthread_call(pthread_mutex_destroy(&mutex));
check_pthread_call(pthread_cond_destroy(&cond));
#endif
}
void on()
{
#ifdef STXXL_BOOST_THREADS
boost::mutex::scoped_lock Lock(mutex);
_on = true;
Lock.unlock();
cond.notify_one();
#else
check_pthread_call(pthread_mutex_lock(&mutex));
_on = true;
check_pthread_call(pthread_mutex_unlock(&mutex));
check_pthread_call(pthread_cond_signal(&cond));
#endif
}
void off()
{
#ifdef STXXL_BOOST_THREADS
boost::mutex::scoped_lock Lock(mutex);
_on = false;
Lock.unlock();
cond.notify_one();
#else
check_pthread_call(pthread_mutex_lock(&mutex));
_on = false;
check_pthread_call(pthread_mutex_unlock(&mutex));
check_pthread_call(pthread_cond_signal(&cond));
#endif
}
void wait_for_on()
{
#ifdef STXXL_BOOST_THREADS
boost::mutex::scoped_lock Lock(mutex);
if (!_on)
cond.wait(Lock);
#else
check_pthread_call(pthread_mutex_lock(&mutex));
if (!_on)
check_pthread_call(pthread_cond_wait(&cond, &mutex));
check_pthread_call(pthread_mutex_unlock(&mutex));
#endif
}
void wait_for_off()
{
#ifdef STXXL_BOOST_THREADS
boost::mutex::scoped_lock Lock(mutex);
if (_on)
cond.wait(Lock);
#else
check_pthread_call(pthread_mutex_lock(&mutex));
if (_on)
check_pthread_call(pthread_cond_wait(&cond, &mutex));
check_pthread_call(pthread_mutex_unlock(&mutex));
#endif
}
bool is_on()
{
#ifdef STXXL_BOOST_THREADS
boost::mutex::scoped_lock Lock(mutex);
return _on;
#else
bool res;
check_pthread_call(pthread_mutex_lock(&mutex));
res = _on;
check_pthread_call(pthread_mutex_unlock(&mutex));
return res;
#endif
}
};
__STXXL_END_NAMESPACE
#endif // !STXXL_SWITCH_HEADER
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