/usr/include/ola/thread/FuturePrivate.h is in libola-dev 0.10.3.nojsmin-2+deb9u1.
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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 | /*
* 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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