/usr/include/loki/Threads.h is in libloki-dev 0.1.7-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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// The Loki Library
// Copyright (c) 2001 by Andrei Alexandrescu
// This code accompanies the book:
// Alexandrescu, Andrei. "Modern C++ Design: Generic Programming and Design
// Patterns Applied". Copyright (c) 2001. Addison-Wesley.
// Permission to use, copy, modify, distribute and sell this software for any
// purpose is hereby granted without fee, provided that the above copyright
// notice appear in all copies and that both that copyright notice and this
// permission notice appear in supporting documentation.
// The author or Addison-Wesley Longman make no representations about the
// suitability of this software for any purpose. It is provided "as is"
// without express or implied warranty.
////////////////////////////////////////////////////////////////////////////////
#ifndef LOKI_THREADS_INC_
#define LOKI_THREADS_INC_
// $Id: Threads.h 902 2008-11-10 05:47:06Z rich_sposato $
/// @defgroup ThreadingGroup Threading
/// Policies to for the threading model:
///
/// - SingleThreaded
/// - ObjectLevelLockable
/// - ClassLevelLockable
///
/// All classes in Loki have configurable threading model.
///
/// The macro LOKI_DEFAULT_THREADING selects the default
/// threading model for certain components of Loki
/// (it affects only default template arguments)
///
/// \par Usage:
///
/// To use a specific threading model define
///
/// - nothing, single-theading is default
/// - LOKI_OBJECT_LEVEL_THREADING for object-level-threading
/// - LOKI_CLASS_LEVEL_THREADING for class-level-threading
///
/// \par Supported platfroms:
///
/// - Windows (windows.h)
/// - POSIX (pthread.h):
/// No recursive mutex support with pthread.
/// This means: calling Lock() on a Loki::Mutex twice from the
/// same thread before unlocking the mutex deadlocks the system.
/// To avoid this redesign your synchronization. See also:
/// http://sourceforge.net/tracker/index.php?func=detail&aid=1516182&group_id=29557&atid=396647
#include <cassert>
#if defined(LOKI_CLASS_LEVEL_THREADING) || defined(LOKI_OBJECT_LEVEL_THREADING)
#define LOKI_DEFAULT_THREADING_NO_OBJ_LEVEL ::Loki::ClassLevelLockable
#if defined(LOKI_CLASS_LEVEL_THREADING) && !defined(LOKI_OBJECT_LEVEL_THREADING)
#define LOKI_DEFAULT_THREADING ::Loki::ClassLevelLockable
#else
#define LOKI_DEFAULT_THREADING ::Loki::ObjectLevelLockable
#endif
#if defined(_WIN32) || defined(_WIN64)
#include <windows.h>
#define LOKI_WINDOWS_H
#else
#include <pthread.h>
#define LOKI_PTHREAD_H
#endif
#else
#define LOKI_DEFAULT_THREADING ::Loki::SingleThreaded
#define LOKI_DEFAULT_THREADING_NO_OBJ_LEVEL ::Loki::SingleThreaded
#endif
#ifndef LOKI_DEFAULT_MUTEX
#define LOKI_DEFAULT_MUTEX ::Loki::Mutex
#endif
#ifdef LOKI_WINDOWS_H
#define LOKI_THREADS_MUTEX(x) CRITICAL_SECTION (x);
#define LOKI_THREADS_MUTEX_INIT(x) ::InitializeCriticalSection (x)
#define LOKI_THREADS_MUTEX_DELETE(x) ::DeleteCriticalSection (x)
#define LOKI_THREADS_MUTEX_LOCK(x) ::EnterCriticalSection (x)
#define LOKI_THREADS_MUTEX_UNLOCK(x) ::LeaveCriticalSection (x)
#define LOKI_THREADS_LONG LONG
#define LOKI_THREADS_MUTEX_CTOR(x)
#define LOKI_THREADS_ATOMIC_FUNCTIONS \
static IntType AtomicMultiply(volatile IntType& lval, const IntType val) \
{ \
::EnterCriticalSection( &atomic_mutex_ ); \
lval *= val; \
::LeaveCriticalSection( &atomic_mutex_ ); \
return lval; \
} \
\
static IntType AtomicDivide(volatile IntType& lval, const IntType val) \
{ \
::EnterCriticalSection( &atomic_mutex_ ); \
lval /= val; \
::LeaveCriticalSection( &atomic_mutex_ ); \
return lval; \
} \
\
static IntType AtomicIncrement(volatile IntType& lval) \
{ \
::EnterCriticalSection( &atomic_mutex_ ); \
++lval; \
::LeaveCriticalSection( &atomic_mutex_ ); \
return lval; \
} \
\
static IntType AtomicDecrement(volatile IntType& lval) \
{ \
::EnterCriticalSection( &atomic_mutex_ ); \
--lval; \
::LeaveCriticalSection( &atomic_mutex_ ); \
return lval; \
} \
\
static void AtomicAssign(volatile IntType& lval, const IntType val) \
{ InterlockedExchange(&const_cast<IntType&>(lval), val); } \
\
static void AtomicAssign(IntType& lval, volatile const IntType& val) \
{ InterlockedExchange(&lval, val); } \
\
static IntType AtomicIncrement(volatile IntType& lval, const IntType compare, bool & matches ) \
{ \
::EnterCriticalSection( &atomic_mutex_ ); \
++lval; \
matches = ( lval == compare ); \
::LeaveCriticalSection( &atomic_mutex_ ); \
return lval; \
} \
\
static IntType AtomicDecrement(volatile IntType& lval, const IntType compare, bool & matches ) \
{ \
::EnterCriticalSection( &atomic_mutex_ ); \
--lval; \
matches = ( lval == compare ); \
::LeaveCriticalSection( &atomic_mutex_ ); \
return lval; \
} \
\
static IntType AtomicAdd(volatile IntType& lval, const IntType val, const IntType compare, bool & matches ) \
{ \
::EnterCriticalSection( &atomic_mutex_ ); \
lval += val; \
matches = ( lval == compare ); \
::LeaveCriticalSection( &atomic_mutex_ ); \
return lval; \
} \
\
static IntType AtomicSubtract(volatile IntType& lval, const IntType val, const IntType compare, bool & matches ) \
{ \
::EnterCriticalSection( &atomic_mutex_ ); \
lval -= val; \
matches = ( lval == compare ); \
::LeaveCriticalSection( &atomic_mutex_ ); \
return lval; \
} \
\
static IntType AtomicMultiply(volatile IntType& lval, const IntType val, const IntType compare, bool & matches ) \
{ \
::EnterCriticalSection( &atomic_mutex_ ); \
lval *= val; \
matches = ( lval == compare ); \
::LeaveCriticalSection( &atomic_mutex_ ); \
return lval; \
} \
\
static IntType AtomicDivide(volatile IntType& lval, const IntType val, const IntType compare, bool & matches ) \
{ \
::EnterCriticalSection( &atomic_mutex_ ); \
lval /= val; \
matches = ( lval == compare ); \
::LeaveCriticalSection( &atomic_mutex_ ); \
return lval; \
}
#elif defined(LOKI_PTHREAD_H)
#define LOKI_THREADS_MUTEX(x) pthread_mutex_t (x);
#define LOKI_THREADS_MUTEX_INIT(x) ::pthread_mutex_init(x, 0)
// define to 1 to enable recursive mutex support
#if 0
// experimental recursive mutex support
#define LOKI_THREADS_MUTEX_CTOR(x) : x(PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP)
#else
// no recursive mutex support
#define LOKI_THREADS_MUTEX_CTOR(x)
#endif
#define LOKI_THREADS_MUTEX_DELETE(x) ::pthread_mutex_destroy (x)
#define LOKI_THREADS_MUTEX_LOCK(x) ::pthread_mutex_lock (x)
#define LOKI_THREADS_MUTEX_UNLOCK(x) ::pthread_mutex_unlock (x)
#define LOKI_THREADS_LONG long
#define LOKI_THREADS_ATOMIC(x) \
pthread_mutex_lock(&atomic_mutex_); \
x; \
pthread_mutex_unlock(&atomic_mutex_)
#define LOKI_THREADS_ATOMIC_FUNCTIONS \
private: \
static pthread_mutex_t atomic_mutex_; \
public: \
static IntType AtomicMultiply(volatile IntType& lval, const IntType val) \
{ \
::pthread_mutex_lock( &atomic_mutex_ ); \
lval *= val; \
::pthread_mutex_unlock( &atomic_mutex_ ); \
return lval; \
} \
\
static IntType AtomicDivide(volatile IntType& lval, const IntType val) \
{ \
::pthread_mutex_lock( &atomic_mutex_ ); \
lval /= val; \
::pthread_mutex_unlock( &atomic_mutex_ ); \
return lval; \
} \
\
static IntType AtomicIncrement(volatile IntType& lval) \
{ \
::pthread_mutex_lock( &atomic_mutex_ ); \
++lval; \
::pthread_mutex_unlock( &atomic_mutex_ ); \
return lval; \
} \
\
static IntType AtomicDecrement(volatile IntType& lval) \
{ \
::pthread_mutex_lock( &atomic_mutex_ ); \
--lval; \
::pthread_mutex_unlock( &atomic_mutex_ ); \
return lval; \
} \
\
static void AtomicAssign(volatile IntType& lval, const IntType val) \
{ \
::pthread_mutex_lock( &atomic_mutex_ ); \
lval = val; \
::pthread_mutex_unlock( &atomic_mutex_ ); \
return lval; \
} \
\
static void AtomicAssign(IntType& lval, volatile const IntType& val) \
{ \
::pthread_mutex_lock( &atomic_mutex_ ); \
lval = val; \
::pthread_mutex_unlock( &atomic_mutex_ ); \
return lval; \
} \
\
static IntType AtomicIncrement(volatile IntType& lval, const IntType compare, bool & matches ) \
{ \
::pthread_mutex_lock( &atomic_mutex_ ); \
++lval; \
matches = ( compare == lval ); \
::pthread_mutex_unlock( &atomic_mutex_ ); \
return lval; \
} \
\
static IntType AtomicDecrement(volatile IntType& lval, const IntType compare, bool & matches ) \
{ \
::pthread_mutex_lock( &atomic_mutex_ ); \
--lval; \
matches = ( compare == lval ); \
::pthread_mutex_unlock( &atomic_mutex_ ); \
return lval; \
} \
static IntType AtomicMultiply(volatile IntType& lval, const IntType val, const IntType compare, bool & matches ) \
{ \
::pthread_mutex_lock( &atomic_mutex_ ); \
lval *= val; \
matches = ( lval == compare ); \
::pthread_mutex_unlock( &atomic_mutex_ ); \
return lval; \
} \
\
static IntType AtomicDivide(volatile IntType& lval, const IntType val, const IntType compare, bool & matches ) \
{ \
::pthread_mutex_lock( &atomic_mutex_ ); \
lval /= val; \
matches = ( lval == compare ); \
::pthread_mutex_unlock( &atomic_mutex_ ); \
return lval; \
}
#else // single threaded
#define LOKI_THREADS_MUTEX(x)
#define LOKI_THREADS_MUTEX_INIT(x)
#define LOKI_THREADS_MUTEX_DELETE(x)
#define LOKI_THREADS_MUTEX_LOCK(x)
#define LOKI_THREADS_MUTEX_UNLOCK(x)
#define LOKI_THREADS_LONG
#define LOKI_THREADS_MUTEX_CTOR(x)
#endif
namespace Loki
{
////////////////////////////////////////////////////////////////////////////////
/// \class Mutex
//
/// \ingroup ThreadingGroup
/// A simple and portable Mutex. A default policy class for locking objects.
////////////////////////////////////////////////////////////////////////////////
class Mutex
{
public:
Mutex() LOKI_THREADS_MUTEX_CTOR(mtx_)
{
LOKI_THREADS_MUTEX_INIT(&mtx_);
}
~Mutex()
{
LOKI_THREADS_MUTEX_DELETE(&mtx_);
}
void Lock()
{
LOKI_THREADS_MUTEX_LOCK(&mtx_);
}
void Unlock()
{
LOKI_THREADS_MUTEX_UNLOCK(&mtx_);
}
private:
/// Copy-constructor not implemented.
Mutex(const Mutex &);
/// Copy-assignement operator not implemented.
Mutex & operator = (const Mutex &);
LOKI_THREADS_MUTEX(mtx_)
};
////////////////////////////////////////////////////////////////////////////////
/// \class SingleThreaded
///
/// \ingroup ThreadingGroup
/// Implementation of the ThreadingModel policy used by various classes
/// Implements a single-threaded model; no synchronization
////////////////////////////////////////////////////////////////////////////////
template <class Host, class MutexPolicy = LOKI_DEFAULT_MUTEX>
class SingleThreaded
{
public:
/// \struct Lock
/// Dummy Lock class
struct Lock
{
Lock() {}
explicit Lock(const SingleThreaded&) {}
explicit Lock(const SingleThreaded*) {}
};
typedef Host VolatileType;
typedef int IntType;
static IntType AtomicAdd(volatile IntType& lval, const IntType val)
{ return lval += val; }
static IntType AtomicSubtract(volatile IntType& lval, const IntType val)
{ return lval -= val; }
static IntType AtomicMultiply(volatile IntType& lval, const IntType val)
{ return lval *= val; }
static IntType AtomicDivide(volatile IntType& lval, const IntType val)
{ return lval /= val; }
static IntType AtomicIncrement(volatile IntType& lval)
{ return ++lval; }
static IntType AtomicDecrement(volatile IntType& lval)
{ return --lval; }
static void AtomicAssign(volatile IntType & lval, const IntType val)
{ lval = val; }
static void AtomicAssign(IntType & lval, volatile IntType & val)
{ lval = val; }
static IntType AtomicAdd(volatile IntType& lval, const IntType val, const IntType compare, bool & matches )
{
lval += val;
matches = ( lval == compare );
return lval;
}
static IntType AtomicSubtract(volatile IntType& lval, const IntType val, const IntType compare, bool & matches )
{
lval -= val;
matches = ( lval == compare );
return lval;
}
static IntType AtomicMultiply(volatile IntType& lval, const IntType val, const IntType compare, bool & matches )
{
lval *= val;
matches = ( lval == compare );
return lval;
}
static IntType AtomicDivide(volatile IntType& lval, const IntType val, const IntType compare, bool & matches )
{
lval /= val;
matches = ( lval == compare );
return lval;
}
static IntType AtomicIncrement(volatile IntType& lval, const IntType compare, bool & matches )
{
++lval;
matches = ( lval == compare );
return lval;
}
static IntType AtomicDecrement(volatile IntType& lval, const IntType compare, bool & matches )
{
--lval;
matches = ( lval == compare );
return lval;
}
};
#if defined(LOKI_WINDOWS_H) || defined(LOKI_PTHREAD_H)
////////////////////////////////////////////////////////////////////////////////
/// \class ObjectLevelLockable
///
/// \ingroup ThreadingGroup
/// Implementation of the ThreadingModel policy used by various classes
/// Implements a object-level locking scheme
////////////////////////////////////////////////////////////////////////////////
template < class Host, class MutexPolicy = LOKI_DEFAULT_MUTEX >
class ObjectLevelLockable
{
mutable MutexPolicy mtx_;
public:
ObjectLevelLockable() : mtx_() {}
ObjectLevelLockable(const ObjectLevelLockable&) : mtx_() {}
~ObjectLevelLockable() {}
class Lock;
friend class Lock;
/// \struct Lock
/// Lock class to lock on object level
class Lock
{
public:
/// Lock object
explicit Lock(const ObjectLevelLockable& host) : host_(host)
{
host_.mtx_.Lock();
}
/// Lock object
explicit Lock(const ObjectLevelLockable* host) : host_(*host)
{
host_.mtx_.Lock();
}
/// Unlock object
~Lock()
{
host_.mtx_.Unlock();
}
private:
/// private by design of the object level threading
Lock();
Lock(const Lock&);
Lock& operator=(const Lock&);
const ObjectLevelLockable& host_;
};
typedef volatile Host VolatileType;
typedef LOKI_THREADS_LONG IntType;
LOKI_THREADS_ATOMIC_FUNCTIONS
};
#ifdef LOKI_PTHREAD_H
template <class Host, class MutexPolicy>
pthread_mutex_t ObjectLevelLockable<Host, MutexPolicy>::atomic_mutex_ = PTHREAD_MUTEX_INITIALIZER;
#endif
////////////////////////////////////////////////////////////////////////////////
/// \class ClassLevelLockable
///
/// \ingroup ThreadingGroup
/// Implementation of the ThreadingModel policy used by various classes
/// Implements a class-level locking scheme
////////////////////////////////////////////////////////////////////////////////
template <class Host, class MutexPolicy = LOKI_DEFAULT_MUTEX >
class ClassLevelLockable
{
struct Initializer
{
bool init_;
MutexPolicy mtx_;
Initializer() : init_(false), mtx_()
{
init_ = true;
}
~Initializer()
{
assert(init_);
}
};
static Initializer initializer_;
public:
class Lock;
friend class Lock;
/// \struct Lock
/// Lock class to lock on class level
class Lock
{
public:
/// Lock class
Lock()
{
assert(initializer_.init_);
initializer_.mtx_.Lock();
}
/// Lock class
explicit Lock(const ClassLevelLockable&)
{
assert(initializer_.init_);
initializer_.mtx_.Lock();
}
/// Lock class
explicit Lock(const ClassLevelLockable*)
{
assert(initializer_.init_);
initializer_.mtx_.Lock();
}
/// Unlock class
~Lock()
{
assert(initializer_.init_);
initializer_.mtx_.Unlock();
}
private:
Lock(const Lock&);
Lock& operator=(const Lock&);
};
typedef volatile Host VolatileType;
typedef LOKI_THREADS_LONG IntType;
LOKI_THREADS_ATOMIC_FUNCTIONS
};
#ifdef LOKI_PTHREAD_H
template <class Host, class MutexPolicy>
pthread_mutex_t ClassLevelLockable<Host, MutexPolicy>::atomic_mutex_ = PTHREAD_MUTEX_INITIALIZER;
#endif
template < class Host, class MutexPolicy >
typename ClassLevelLockable< Host, MutexPolicy >::Initializer
ClassLevelLockable< Host, MutexPolicy >::initializer_;
#endif // #if defined(LOKI_WINDOWS_H) || defined(LOKI_PTHREAD_H)
} // namespace Loki
#endif // end file guardian
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