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rwlock.hpp
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rwlock.hpp
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#ifndef RW_LOCK_HPP
#define RW_LOCK_HPP
#ifdef _WIN32
#include <SDKDDKVer.h>
#ifdef _WIN32_WINNT_WIN8
#include <Synchapi.h>
#else
#include <WinBase.h>
#endif
#else
#include <pthread.h>
#endif
namespace Exiv2 {
namespace Internal {
#ifdef _WIN32
class RWLock
{
public:
RWLock()
{
InitializeSRWLock(&rwlock_);
}
~RWLock()
{
// do not explicitly destroy
}
void wrlock()
{
AcquireSRWLockExclusive(&rwlock_);
}
bool trywrlock()
{
return TryAcquireSRWLockExclusive(&rwlock_);
}
void rdlock()
{
AcquireSRWLockShared(&rwlock_);
}
bool tryrdlock()
{
return TryAcquireSRWLockShared(&rwlock_);
}
void rdunlock()
{
ReleaseSRWLockShared(&rwlock_);
}
void wrunlock()
{
ReleaseSRWLockExclusive(&rwlock_);
}
private:
SRWLOCK rwlock_;
};
#else
class RWLock
{
public:
RWLock(const pthread_rwlockattr_t *attr = 0)
{
pthread_rwlock_init(&rwlock_, attr);
}
~RWLock()
{
pthread_rwlock_destroy(&rwlock_);
}
int wrlock()
{
return pthread_rwlock_wrlock(&rwlock_);
}
int trywrlock()
{
return pthread_rwlock_trywrlock(&rwlock_);
}
int rdlock()
{
return pthread_rwlock_rdlock(&rwlock_);
}
int tryrdlock()
{
return pthread_rwlock_tryrdlock(&rwlock_);
}
int unlock()
{
return pthread_rwlock_unlock(&rwlock_);
}
void rdunlock() { unlock(); }
void wrunlock() { unlock(); }
private:
pthread_rwlock_t rwlock_;
};
#endif
class ScopedReadLock
{
public:
ScopedReadLock(RWLock &rwlock):
rwlock_(rwlock)
{
rwlock_.rdlock();
}
~ScopedReadLock() { rwlock_.rdunlock(); }
private:
RWLock &rwlock_;
};
class ScopedWriteLock
{
public:
ScopedWriteLock(RWLock &rwlock):
rwlock_(rwlock)
{
rwlock_.wrlock();
}
~ScopedWriteLock() { rwlock_.wrunlock(); }
private:
RWLock &rwlock_;
};
}
}
#endif // RW_LOCK_HPP