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// **********************************************************************
//
// Copyright (c) 2003
// ZeroC, Inc.
// Billerica, MA, USA
//
// All Rights Reserved.
//
// Ice is free software; you can redistribute it and/or modify it under
// the terms of the GNU General Public License version 2 as published by
// the Free Software Foundation.
//
// **********************************************************************
#ifndef ICE_UTIL_THREAD_H
#define ICE_UTIL_THREAD_H
#include <IceUtil/Shared.h>
#include <IceUtil/Handle.h>
#include <IceUtil/Mutex.h>
namespace IceUtil
{
class Time;
#ifdef _WIN32
struct HandleWrapper : public Shared
{
// Inline for performance reasons.
HandleWrapper(HANDLE h) :
handle(h)
{
}
// Inline for performance reasons.
virtual ~HandleWrapper()
{
if(handle)
{
CloseHandle(handle);
}
}
HANDLE handle;
};
typedef Handle<HandleWrapper> HandleWrapperPtr;
#endif
#ifdef _WIN32
typedef unsigned int ThreadId;
#else
typedef pthread_t ThreadId;
#endif
class ICE_UTIL_API ThreadControl
{
public:
ThreadControl();
#ifdef _WIN32
ThreadControl(const HandleWrapperPtr&, unsigned int);
#else
ThreadControl(pthread_t);
#endif
bool operator==(const ThreadControl&) const;
bool operator!=(const ThreadControl&) const;
bool operator<(const ThreadControl&) const;
//
// Return the ID of the thread underlying this ThreadControl.
//
ThreadId id() const;
//
// Wait until the controlled thread terminates. The call has POSIX
// semantics.
//
// At most one thread can wait for the termination of a given
// thread.C alling join on a thread on which another thread is
// already waiting for termination results in undefined behaviour.
// Joining with a thread after having joined with it previously,
// or joining with a detached thread raises ThreadSyscallException.
//
void join();
//
// Detach a thread. Once a thread is detached, it cannot be detached
// again, nor can it be joined with. Every thread must either be
// joined with or detached exactly once. Detaching a thread a second
// time, or detaching a thread that was previously joined with raises
// ThreadSyscallException.
//
void detach();
//
// Check whether a thread is still alive. This is useful to implement
// a non-blocking join().
//
bool isAlive() const;
static void sleep(const Time&);
static void yield();
private:
#ifdef _WIN32
HandleWrapperPtr _handle;
#endif
ThreadId _id;
bool _detached;
};
class ICE_UTIL_API Thread : virtual public IceUtil::Shared
{
public:
Thread();
virtual ~Thread();
ThreadId id() const;
virtual void run() = 0;
ThreadControl start();
ThreadControl getThreadControl() const;
bool operator==(const Thread&) const;
bool operator!=(const Thread&) const;
bool operator<(const Thread&) const;
private:
Mutex _stateMutex;
bool _started;
#ifdef _WIN32
HandleWrapperPtr _handle;
#endif
ThreadId _id;
};
typedef Handle<Thread> ThreadPtr;
}
#endif
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