/usr/include/ola/thread/FuturePrivate.h is in libola-dev 0.9.8-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* FuturePrivate.h
* An experimental implementation of Futures.
* Copyright (C) 2010 Simon Newton
*/
#ifndef INCLUDE_OLA_THREAD_FUTUREPRIVATE_H_
#define INCLUDE_OLA_THREAD_FUTUREPRIVATE_H_
#include <ola/Logging.h>
#include <ola/base/Macro.h>
#include <ola/thread/Mutex.h>
namespace ola {
namespace thread {
template <typename T>
class FutureImpl {
public:
FutureImpl()
: m_ref_count(1),
m_is_set(false),
m_value() {
}
void Ref() {
{
MutexLocker l(&m_mutex);
m_ref_count++;
}
}
void DeRef() {
unsigned int ref_count = 0;
{
MutexLocker l(&m_mutex);
ref_count = --m_ref_count;
}
if (ref_count == 0) {
delete this;
}
}
bool IsComplete() const {
MutexLocker l(&m_mutex);
return m_is_set;
}
const T& Get() const {
MutexLocker l(&m_mutex);
if (m_is_set) {
return m_value;
}
m_condition.Wait(&m_mutex);
return m_value;
}
void Set(const T &t) {
{
MutexLocker l(&m_mutex);
if (m_is_set) {
OLA_FATAL << "Double call to FutureImpl::Set()";
return;
}
m_is_set = true;
m_value = t;
}
m_condition.Broadcast();
}
private:
mutable Mutex m_mutex;
mutable ConditionVariable m_condition;
unsigned int m_ref_count;
bool m_is_set;
T m_value;
DISALLOW_COPY_AND_ASSIGN(FutureImpl<T>);
};
/**
* The void specialization
*/
template <>
class FutureImpl<void> {
public:
FutureImpl()
: m_ref_count(1),
m_is_set(false) {
}
void Ref() {
{
MutexLocker l(&m_mutex);
m_ref_count++;
}
}
void DeRef() {
unsigned int ref_count = 0;
{
MutexLocker l(&m_mutex);
ref_count = --m_ref_count;
}
if (ref_count == 0) {
delete this;
}
}
bool IsComplete() const {
MutexLocker l(&m_mutex);
return m_is_set;
}
void Get() const {
MutexLocker l(&m_mutex);
if (m_is_set) {
return;
}
m_condition.Wait(&m_mutex);
}
void Set() {
{
MutexLocker l(&m_mutex);
if (m_is_set) {
OLA_FATAL << "Double call to FutureImpl::Set()";
return;
}
m_is_set = true;
}
m_condition.Broadcast();
}
private:
mutable Mutex m_mutex;
mutable ConditionVariable m_condition;
unsigned int m_ref_count;
bool m_is_set;
DISALLOW_COPY_AND_ASSIGN(FutureImpl<void>);
};
} // namespace thread
} // namespace ola
#endif // INCLUDE_OLA_THREAD_FUTUREPRIVATE_H_
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