mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-11-25 00:52:02 +00:00
351 lines
8.8 KiB
C++
351 lines
8.8 KiB
C++
//
|
|
// Thread.h
|
|
//
|
|
// Library: Foundation
|
|
// Package: Threading
|
|
// Module: Thread
|
|
//
|
|
// Definition of the Thread class.
|
|
//
|
|
// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
|
|
// and Contributors.
|
|
//
|
|
// SPDX-License-Identifier: BSL-1.0
|
|
//
|
|
|
|
|
|
#ifndef Foundation_Thread_INCLUDED
|
|
#define Foundation_Thread_INCLUDED
|
|
|
|
|
|
#include "Poco/Event.h"
|
|
#include "Poco/Foundation.h"
|
|
#include "Poco/Mutex.h"
|
|
|
|
|
|
# include "Poco/Thread_POSIX.h"
|
|
|
|
|
|
namespace Poco
|
|
{
|
|
|
|
|
|
class Runnable;
|
|
class ThreadLocalStorage;
|
|
|
|
|
|
class Foundation_API Thread : private ThreadImpl
|
|
/// This class implements a platform-independent
|
|
/// wrapper to an operating system thread.
|
|
///
|
|
/// Every Thread object gets a unique (within
|
|
/// its process) numeric thread ID.
|
|
/// Furthermore, a thread can be assigned a name.
|
|
/// The name of a thread can be changed at any time.
|
|
{
|
|
public:
|
|
typedef ThreadImpl::TIDImpl TID;
|
|
|
|
using ThreadImpl::Callable;
|
|
|
|
enum Priority
|
|
/// Thread priorities.
|
|
{
|
|
PRIO_LOWEST = PRIO_LOWEST_IMPL, /// The lowest thread priority.
|
|
PRIO_LOW = PRIO_LOW_IMPL, /// A lower than normal thread priority.
|
|
PRIO_NORMAL = PRIO_NORMAL_IMPL, /// The normal thread priority.
|
|
PRIO_HIGH = PRIO_HIGH_IMPL, /// A higher than normal thread priority.
|
|
PRIO_HIGHEST = PRIO_HIGHEST_IMPL /// The highest thread priority.
|
|
};
|
|
|
|
enum Policy
|
|
{
|
|
POLICY_DEFAULT = POLICY_DEFAULT_IMPL
|
|
};
|
|
|
|
Thread();
|
|
/// Creates a thread. Call start() to start it.
|
|
|
|
Thread(const std::string & name);
|
|
/// Creates a named thread. Call start() to start it.
|
|
|
|
~Thread();
|
|
/// Destroys the thread.
|
|
|
|
int id() const;
|
|
/// Returns the unique thread ID of the thread.
|
|
|
|
TID tid() const;
|
|
/// Returns the native thread ID of the thread.
|
|
|
|
std::string name() const;
|
|
/// Returns the name of the thread.
|
|
|
|
std::string getName() const;
|
|
/// Returns the name of the thread.
|
|
|
|
void setName(const std::string & name);
|
|
/// Sets the name of the thread.
|
|
|
|
void setPriority(Priority prio);
|
|
/// Sets the thread's priority.
|
|
///
|
|
/// Some platform only allow changing a thread's priority
|
|
/// if the process has certain privileges.
|
|
|
|
Priority getPriority() const;
|
|
/// Returns the thread's priority.
|
|
|
|
void setOSPriority(int prio, int policy = POLICY_DEFAULT);
|
|
/// Sets the thread's priority, using an operating system specific
|
|
/// priority value. Use getMinOSPriority() and getMaxOSPriority() to
|
|
/// obtain minimum and maximum priority values. Additionally,
|
|
/// a scheduling policy can be specified. The policy is currently
|
|
/// only used on POSIX platforms where the values SCHED_OTHER (default),
|
|
/// SCHED_FIFO and SCHED_RR are supported.
|
|
|
|
int getOSPriority() const;
|
|
/// Returns the thread's priority, expressed as an operating system
|
|
/// specific priority value.
|
|
///
|
|
/// May return 0 if the priority has not been explicitly set.
|
|
|
|
static int getMinOSPriority(int policy = POLICY_DEFAULT);
|
|
/// Returns the minimum operating system-specific priority value,
|
|
/// which can be passed to setOSPriority() for the given policy.
|
|
|
|
static int getMaxOSPriority(int policy = POLICY_DEFAULT);
|
|
/// Returns the maximum operating system-specific priority value,
|
|
/// which can be passed to setOSPriority() for the given policy.
|
|
|
|
void setStackSize(int size);
|
|
/// Sets the thread's stack size in bytes.
|
|
/// Setting the stack size to 0 will use the default stack size.
|
|
/// Typically, the real stack size is rounded up to the nearest
|
|
/// page size multiple.
|
|
|
|
int getStackSize() const;
|
|
/// Returns the thread's stack size in bytes.
|
|
/// If the default stack size is used, 0 is returned.
|
|
|
|
void start(Runnable & target);
|
|
/// Starts the thread with the given target.
|
|
///
|
|
/// Note that the given Runnable object must remain
|
|
/// valid during the entire lifetime of the thread, as
|
|
/// only a reference to it is stored internally.
|
|
|
|
void start(Callable target, void * pData = 0);
|
|
/// Starts the thread with the given target and parameter.
|
|
|
|
template <class Functor>
|
|
void startFunc(Functor fn)
|
|
/// Starts the thread with the given functor object or lambda.
|
|
{
|
|
startImpl(new FunctorRunnable<Functor>(fn));
|
|
}
|
|
|
|
void join();
|
|
/// Waits until the thread completes execution.
|
|
/// If multiple threads try to join the same
|
|
/// thread, the result is undefined.
|
|
|
|
void join(long milliseconds);
|
|
/// Waits for at most the given interval for the thread
|
|
/// to complete. Throws a TimeoutException if the thread
|
|
/// does not complete within the specified time interval.
|
|
|
|
bool tryJoin(long milliseconds);
|
|
/// Waits for at most the given interval for the thread
|
|
/// to complete. Returns true if the thread has finished,
|
|
/// false otherwise.
|
|
|
|
bool isRunning() const;
|
|
/// Returns true if the thread is running.
|
|
|
|
static bool trySleep(long milliseconds);
|
|
/// Starts an interruptible sleep. When trySleep() is called,
|
|
/// the thread will remain suspended until:
|
|
/// - the timeout expires or
|
|
/// - wakeUp() is called
|
|
///
|
|
/// Function returns true if sleep attempt was completed, false
|
|
/// if sleep was interrupted by a wakeUp() call.
|
|
/// A frequent scenario where trySleep()/wakeUp() pair of functions
|
|
/// is useful is with threads spending most of the time idle,
|
|
/// with periodic activity between the idle times; trying to sleep
|
|
/// (as opposed to sleeping) allows immediate ending of idle thread
|
|
/// from the outside.
|
|
///
|
|
/// The trySleep() and wakeUp() calls should be used with
|
|
/// understanding that the suspended state is not a true sleep,
|
|
/// but rather a state of waiting for an event, with timeout
|
|
/// expiration. This makes order of calls significant; calling
|
|
/// wakeUp() before calling trySleep() will prevent the next
|
|
/// trySleep() call to actually suspend the thread (which, in
|
|
/// some scenarios, may be desirable behavior).
|
|
|
|
void wakeUp();
|
|
/// Wakes up the thread which is in the state of interruptible
|
|
/// sleep. For threads that are not suspended, calling this
|
|
/// function has the effect of preventing the subsequent
|
|
/// trySleep() call to put thread in a suspended state.
|
|
|
|
static void sleep(long milliseconds);
|
|
/// Suspends the current thread for the specified
|
|
/// amount of time.
|
|
|
|
static void yield();
|
|
/// Yields cpu to other threads.
|
|
|
|
static Thread * current();
|
|
/// Returns the Thread object for the currently active thread.
|
|
/// If the current thread is the main thread, 0 is returned.
|
|
|
|
static TID currentTid();
|
|
/// Returns the native thread ID for the current thread.
|
|
|
|
protected:
|
|
ThreadLocalStorage & tls();
|
|
/// Returns a reference to the thread's local storage.
|
|
|
|
void clearTLS();
|
|
/// Clears the thread's local storage.
|
|
|
|
std::string makeName();
|
|
/// Creates a unique name for a thread.
|
|
|
|
static int uniqueId();
|
|
/// Creates and returns a unique id for a thread.
|
|
|
|
template <class Functor>
|
|
class FunctorRunnable : public Runnable
|
|
{
|
|
public:
|
|
FunctorRunnable(const Functor & functor) : _functor(functor) { }
|
|
|
|
~FunctorRunnable() { }
|
|
|
|
void run() { _functor(); }
|
|
|
|
private:
|
|
Functor _functor;
|
|
};
|
|
|
|
private:
|
|
Thread(const Thread &);
|
|
Thread & operator=(const Thread &);
|
|
|
|
int _id;
|
|
std::string _name;
|
|
ThreadLocalStorage * _pTLS;
|
|
Event _event;
|
|
mutable FastMutex _mutex;
|
|
|
|
friend class ThreadLocalStorage;
|
|
friend class PooledThread;
|
|
};
|
|
|
|
|
|
//
|
|
// inlines
|
|
//
|
|
inline Thread::TID Thread::tid() const
|
|
{
|
|
return tidImpl();
|
|
}
|
|
|
|
|
|
inline int Thread::id() const
|
|
{
|
|
return _id;
|
|
}
|
|
|
|
|
|
inline std::string Thread::name() const
|
|
{
|
|
FastMutex::ScopedLock lock(_mutex);
|
|
|
|
return _name;
|
|
}
|
|
|
|
|
|
inline std::string Thread::getName() const
|
|
{
|
|
FastMutex::ScopedLock lock(_mutex);
|
|
|
|
return _name;
|
|
}
|
|
|
|
|
|
inline bool Thread::isRunning() const
|
|
{
|
|
return isRunningImpl();
|
|
}
|
|
|
|
|
|
inline void Thread::sleep(long milliseconds)
|
|
{
|
|
sleepImpl(milliseconds);
|
|
}
|
|
|
|
|
|
inline void Thread::yield()
|
|
{
|
|
yieldImpl();
|
|
}
|
|
|
|
|
|
inline Thread * Thread::current()
|
|
{
|
|
return static_cast<Thread *>(currentImpl());
|
|
}
|
|
|
|
|
|
inline void Thread::setOSPriority(int prio, int policy)
|
|
{
|
|
setOSPriorityImpl(prio, policy);
|
|
}
|
|
|
|
|
|
inline int Thread::getOSPriority() const
|
|
{
|
|
return getOSPriorityImpl();
|
|
}
|
|
|
|
|
|
inline int Thread::getMinOSPriority(int policy)
|
|
{
|
|
return ThreadImpl::getMinOSPriorityImpl(policy);
|
|
}
|
|
|
|
|
|
inline int Thread::getMaxOSPriority(int policy)
|
|
{
|
|
return ThreadImpl::getMaxOSPriorityImpl(policy);
|
|
}
|
|
|
|
|
|
inline void Thread::setStackSize(int size)
|
|
{
|
|
setStackSizeImpl(size);
|
|
}
|
|
|
|
|
|
inline int Thread::getStackSize() const
|
|
{
|
|
return getStackSizeImpl();
|
|
}
|
|
|
|
|
|
inline Thread::TID Thread::currentTid()
|
|
{
|
|
return currentTidImpl();
|
|
}
|
|
|
|
|
|
} // namespace Poco
|
|
|
|
|
|
#endif // Foundation_Thread_INCLUDED
|