/usr/include/mongo/util/concurrency/threadlocal.h is in mongodb-dev 1:2.4.9-1ubuntu2.
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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 | #pragma once
/**
* Copyright (C) 2011 10gen Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* This program 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "mongo/client/undef_macros.h"
#include <boost/thread/tss.hpp>
#include <boost/bind.hpp>
#include "mongo/client/redef_macros.h"
namespace mongo {
using boost::thread_specific_ptr;
/* thread local "value" rather than a pointer
good for things which have copy constructors (and the copy constructor is fast enough)
e.g.
ThreadLocalValue<int> myint;
*/
template<class T>
class ThreadLocalValue {
public:
ThreadLocalValue( T def = 0 ) : _default( def ) { }
T get() const {
T * val = _val.get();
if ( val )
return *val;
return _default;
}
void set( const T& i ) {
T *v = _val.get();
if( v ) {
*v = i;
return;
}
v = new T(i);
_val.reset( v );
}
T& getRef() {
T *v = _val.get();
if( v ) {
return *v;
}
v = new T(_default);
_val.reset( v );
return *v;
}
private:
boost::thread_specific_ptr<T> _val;
const T _default;
};
/* TSP
These macros use intrinsics which are faster than boost::thread_specific_ptr.
However the intrinsics don't free up objects on thread closure. Thus we use
a combination here, with the assumption that reset's are infrequent, so that
get's are fast.
*/
#if defined(_WIN32) || (defined(__GNUC__) && defined(__linux__))
template< class T >
struct TSP {
boost::thread_specific_ptr<T> tsp;
public:
T* get() const;
void reset(T* v);
T* getMake() {
T *t = get();
if( t == 0 )
reset( t = new T() );
return t;
}
};
# if defined(_WIN32)
# define TSP_DECLARE(T,p) extern TSP<T> p;
# define TSP_DEFINE(T,p) __declspec( thread ) T* _ ## p; \
TSP<T> p; \
template<> T* TSP<T>::get() const { return _ ## p; } \
void TSP<T>::reset(T* v) { \
tsp.reset(v); \
_ ## p = v; \
}
# else
# define TSP_DECLARE(T,p) \
extern __thread T* _ ## p; \
template<> inline T* TSP<T>::get() const { return _ ## p; } \
extern TSP<T> p;
# define TSP_DEFINE(T,p) \
__thread T* _ ## p; \
template<> void TSP<T>::reset(T* v) { \
tsp.reset(v); \
_ ## p = v; \
} \
TSP<T> p;
# endif
#elif defined(__APPLE__)
template< class T>
struct TSP {
pthread_key_t _key;
public:
TSP() {
verify( pthread_key_create( &_key, TSP::dodelete ) == 0 );
}
~TSP() {
pthread_key_delete( _key );
}
static void dodelete( void* x ) {
T* t = reinterpret_cast<T*>(x);
delete t;
}
T* get() const {
return reinterpret_cast<T*>( pthread_getspecific( _key ) );
}
void reset(T* v) {
T* old = get();
delete old;
verify( pthread_setspecific( _key, v ) == 0 );
}
T* getMake() {
T *t = get();
if( t == 0 ) {
t = new T();
reset( t );
}
return t;
}
};
# define TSP_DECLARE(T,p) extern TSP<T> p;
# define TSP_DEFINE(T,p) TSP<T> p;
#else
template< class T >
struct TSP {
thread_specific_ptr<T> tsp;
public:
T* get() const { return tsp.get(); }
void reset(T* v) { tsp.reset(v); }
T* getMake() {
T *t = get();
if( t == 0 )
reset( t = new T() );
return t;
}
};
# define TSP_DECLARE(T,p) extern TSP<T> p;
# define TSP_DEFINE(T,p) TSP<T> p;
#endif
}
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