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// Copyright (C) 2006 Davis E. King (davis@dlib.net)
// License: Boost Software License See LICENSE.txt for the full license.
#ifndef DLIB_AUTO_UNLOCK_EXTENSIOn_
#define DLIB_AUTO_UNLOCK_EXTENSIOn_
#include "threads_kernel.h"
#include "rmutex_extension.h"
#include "read_write_mutex_extension.h"
#include "auto_unlock_extension_abstract.h"
namespace dlib
{
// ----------------------------------------------------------------------------------------
class auto_unlock
{
/*!
INITIAL VALUE
- if (m != 0) then
- the mutex pointed to by m is locked
- if (r != 0) then
- the mutex pointed to by r is locked
- if (rw != 0) then
- the mutex pointed to by rw is locked
- exactly one of r, m, or rw is not 0.
CONVENTION
- if (m != 0) then
- the mutex pointed to by m is locked
- if (r != 0) then
- the mutex pointed to by r is locked
- if (rw != 0) then
- the mutex pointed to by rw is locked
- exactly one of r, m, or rw is not 0.
!*/
public:
explicit auto_unlock (
const mutex& m_
) : m(&m_),
r(0),
rw(0)
{}
explicit auto_unlock (
const rmutex& r_
) : m(0),
r(&r_),
rw(0)
{}
explicit auto_unlock (
const read_write_mutex& rw_
) : m(0),
r(0),
rw(&rw_)
{}
~auto_unlock (
)
{
if (m != 0)
m->unlock();
else if (r != 0)
r->unlock();
else
rw->unlock();
}
private:
const mutex* m;
const rmutex* r;
const read_write_mutex* rw;
// restricted functions
auto_unlock(auto_unlock&); // copy constructor
auto_unlock& operator=(auto_unlock&); // assignment operator
};
// ----------------------------------------------------------------------------------------
class auto_unlock_readonly
{
public:
explicit auto_unlock_readonly (
const read_write_mutex& rw_
) :
rw(rw_)
{}
~auto_unlock_readonly (
)
{
rw.unlock_readonly();
}
private:
const read_write_mutex& rw;
// restricted functions
auto_unlock_readonly(auto_unlock_readonly&); // copy constructor
auto_unlock_readonly& operator=(auto_unlock_readonly&); // assignment operator
};
// ----------------------------------------------------------------------------------------
}
#endif // DLIB_AUTO_UNLOCK_EXTENSIOn_
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