/usr/include/osl/misc/atomicCounter.h is in libosl-dev 0.4.2-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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*/
#ifndef OSL_ATOMICCOUNTER_H
#define OSL_ATOMICCOUNTER_H
#include "osl/config.h"
#ifdef USE_TBB_ATOMIC
# include <tbb/atomic.h>
#else
# include "osl/misc/lightMutex.h"
#endif
#include <algorithm>
namespace osl
{
namespace misc
{
template <class Counter>
struct IncrementLock
{
Counter& counter;
explicit IncrementLock(Counter& c) : counter(c)
{
counter.inc();
}
~IncrementLock()
{
counter.dec();
}
};
#ifdef USE_TBB_ATOMIC
class AtomicCounter
{
tbb::atomic<int> count;
public:
explicit AtomicCounter(int count_=0) {
this->count=count_;
}
void inc(){
count.fetch_and_increment();
}
int valueAndinc(){
return count.fetch_and_increment();
}
void dec(){
count.fetch_and_decrement();
}
void max(int val){
int x=count;
if(x<val){
int oldx;
while((oldx=count.compare_and_swap(val,x))!=x){
x=oldx;
if(x>=val) break;
}
}
}
int value() const{
return count;
}
void setValue(int value) {
count = value;
}
typedef IncrementLock<AtomicCounter> IncLock;
};
#else
class AtomicCounter
{
typedef LightMutex Mutex;
mutable Mutex m;
int count;
public:
explicit AtomicCounter(int count=0) :count(count){}
void inc(){
Mutex::scoped_lock lk(m);
count++;
}
int valueAndinc(){
Mutex::scoped_lock lk(m);
return count++;
}
void dec(){
Mutex::scoped_lock lk(m);
count--;
}
void max(int val){
Mutex::scoped_lock lk(m);
count=std::max(count,val);
}
int value() const{
Mutex::scoped_lock lk(m);
return count;
}
void setValue(int value) {
Mutex::scoped_lock lk(m);
count = value;
}
typedef IncrementLock<AtomicCounter> IncLock;
};
#endif
}
using misc::AtomicCounter;
}
#endif /* OSL_ATOMICCOUNTER_H */
// ;;; Local Variables:
// ;;; mode:c++
// ;;; c-basic-offset:2
// ;;; End:
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