Manages a pool of RWRunnableServer instances used to start runnable objects submitted for execution by other threads. More...

#include <rw/thread/RWServerPool.h>

Inheritance diagram for RWServerPool:

Public Member Functions
	RWServerPool ()

	RWServerPool (const RWServerPool &second)

	~RWServerPool ()

RWThreadAttribute	getPoolAttribute ()

RWServerPool &	operator= (const RWServerPool &second)

void	resize (size_t size)

void	setPoolAttribute (const RWThreadAttribute &poolThreadsAttr)

size_t	size () const

Public Member Functions inherited from RWRunnableServer
	RWRunnableServer ()

	RWRunnableServer (const RWRunnableServer &second)

	~RWRunnableServer ()

void	checkGuards ()

void	enqueue (const RWRunnable &runnable)

RWWaitStatus	enqueue (const RWRunnable &runnable, unsigned long milliseconds)

void	enqueue (const RWRunnable &runnable, const RWRunnableGuard &guard)

RWWaitStatus	enqueue (const RWRunnable &runnable, const RWRunnableGuard &guard, unsigned long milliseconds)

void	enqueue (long priority, const RWRunnable &runnable)

RWWaitStatus	enqueue (long priority, const RWRunnable &runnable, unsigned long milliseconds)

void	enqueue (long priority, const RWRunnable &runnable, const RWRunnableGuard &guard)

RWWaitStatus	enqueue (long priority, const RWRunnable &runnable, const RWRunnableGuard &guard, unsigned long milliseconds)

size_t	getCapacity () const

RWRunnableServer &	operator= (const RWRunnableServer &second)

size_t	setCapacity (size_t maxCapacity)

void	stop ()

Public Member Functions inherited from RWThread
	RWThread ()

	RWThread (RWStaticCtor)

	RWThread (const RWThread &second)

	~RWThread ()

bool	canGetPriority () const

bool	canGetProcessScopePriority () const

bool	canGetSchedulingPolicy () const

bool	canGetSystemScopePriority () const

bool	canGetTimeSliceQuantum () const

bool	canSetPriority () const

bool	canSetProcessScopePriority () const

bool	canSetSchedulingPolicy (RWSchedulingPolicy policy) const

bool	canSetSystemScopePriority () const

bool	canSetTimeSliceQuantum () const

RWThreadAttribute	getActiveAttribute () const

RWThreadAttribute	getAttribute () const

RWPriority	getMaxPriority () const

RWPriority	getMaxProcessScopePriority () const

RWPriority	getMaxSystemScopePriority () const

unsigned long	getMaxTimeSliceQuantum () const

RWPriority	getMinPriority () const

RWPriority	getMinProcessScopePriority () const

RWPriority	getMinSystemScopePriority () const

unsigned long	getMinTimeSliceQuantum () const

RWPriority	getPriority () const

RWPriority	getProcessScopePriority () const

RWThreadSelf	getRWThreadSelf () const

RWSchedulingPolicy	getSchedulingPolicy () const

unsigned	getSuspendCount () const

RWPriority	getSystemScopePriority () const

unsigned long	getTimeSliceQuantum () const

RWThread &	operator= (const RWThread &second)

unsigned	resume ()

void	setAttribute (const RWThreadAttribute &second)

void	setPriority (RWPriority priority)

void	setProcessScopePriority (RWPriority priority)

void	setSchedulingPolicy (RWSchedulingPolicy policy)

void	setSystemScopePriority (RWPriority priority)

void	setTimeSliceQuantum (unsigned long milliseconds)

unsigned	suspend ()

void	terminate ()

Public Member Functions inherited from RWRunnable
	RWRunnable ()

	RWRunnable (RWStaticCtor)

	RWRunnable (const RWRunnable &second)

	~RWRunnable ()

RWRunnable	getNestedRunnable () const

RWRunnableSelf	getRWRunnableSelf () const

void	join (void)

RWWaitStatus	join (unsigned long milliseconds)

RWRunnable &	operator= (const RWRunnable &second)

void	raise () const

void	releaseInterrupt ()

RWWaitStatus	requestCancellation ()

RWWaitStatus	requestCancellation (unsigned long milliseconds)

RWWaitStatus	requestInterrupt ()

RWWaitStatus	requestInterrupt (unsigned long milliseconds)

RWCompletionState	start ()

RWExecutionState	wait (unsigned long stateMask)

RWWaitStatus	wait (unsigned long stateMask, RWExecutionState *state, unsigned long milliseconds)

Public Member Functions inherited from RWRunnableHandle
void	addCallback (const RWTFunctor< void(const RWRunnable &, RWExecutionState)> &functor, unsigned long stateMask, RWCallbackScope scope=RW_CALL_REPEATEDLY)

RWCompletionState	getCompletionState () const

RWExecutionState	getExecutionState () const

bool	isInterruptRequested () const

bool	isSelf () const

bool	isSelf (const RWThreadId &id) const

void	removeCallback (const RWTFunctor< void(const RWRunnable &, RWExecutionState)> &functor)

RWThreadId	threadId () const

Public Member Functions inherited from RWHandleBase
bool	isValid (void) const

bool	operator!= (const RWHandleBase &second) const

bool	operator< (const RWHandleBase &second) const

bool	operator== (const RWHandleBase &second) const

Static Public Member Functions
static RWServerPool	make (size_t numThreads)

static RWServerPool	make (size_t numThreads, size_t maxCapacity)

static RWServerPool	make (const RWThreadAttribute &serverThreadAttr, size_t numThreads)

static RWServerPool	make (const RWThreadAttribute &serverThreadAttr, size_t numThreads, size_t maxCapacity)

static RWServerPool	make (size_t numThreads, const RWThreadAttribute &poolThreadsAttr)

static RWServerPool	make (size_t numThreads, const RWThreadAttribute &poolThreadAttr, size_t maxCapacity)

static RWServerPool	make (const RWThreadAttribute &serverThreadAttr, size_t numThreads, const RWThreadAttribute &poolThreadsAttr)

static RWServerPool	make (const RWThreadAttribute &serverThreadAttr, size_t numThreads, const RWThreadAttribute &poolThreadsAttr, size_t maxCapacity)

Static Public Member Functions inherited from RWRunnableServer
static RWRunnableServer	make ()

static RWRunnableServer	make (const RWThreadAttribute &serverThreadAttr)

static RWRunnableServer	make (size_t maxCapacity)

static RWRunnableServer	make (const RWThreadAttribute &serverThreadAttr, size_t maxCapacity)

Static Public Member Functions inherited from RWThread
static bool	canGetMaxThreads ()

static bool	canSuspendResume ()

static size_t	getMaxThreads ()

Additional Inherited Members
Protected Member Functions inherited from RWThread
	RWThread (RWThreadImp *threadImpP)

Protected Member Functions inherited from RWRunnable
	RWRunnable (const RWRunnableSelf &second)

Protected Member Functions inherited from RWRunnableHandle
	RWRunnableHandle ()

	RWRunnableHandle (RWStaticCtor)

	RWRunnableHandle (RWRunnableImp *runnableImpP)

	RWRunnableHandle (const RWRunnableHandle &second)

	~RWRunnableHandle ()

RWRunnableHandle &	operator= (const RWRunnableHandle &second)

Protected Member Functions inherited from RWHandleBase
	RWHandleBase (void)

	RWHandleBase (RWStaticCtor)

	RWHandleBase (RWBodyBase *body)

	RWHandleBase (const RWHandleBase &second)

	~RWHandleBase (void)

RWBodyBase &	body (void) const

RWHandleBase &	operator= (const RWHandleBase &second)

Related Functions inherited from RWRunnableServer
typedef RWTFunctor< bool()>	RWRunnableGuard

Detailed Description

The RWServerPool object is an RWRunnableServer that manages a "pool" of other RWRunnableServer instances that are used to start runnable objects submitted for execution by other threads. A server pool object, when started, waits for other threads to enqueue runnable objects for execution. Each runnable object that the server finds in its internal queue is dequeued and passed to the next available runnable server from the pool. This process continues until the server pool object is interrupted, canceled, or stopped.

Runnables may be enqueued with a guard functor, or a priority value, or both.

The guard functor is used by the server to determine whether the associated runnable is currently eligible for retrieval and execution. A guarded runnable is not retrieved by the server until that runnable is the first runnable in the queue whose guard evaluates to true. Using guards to block runnable execution is important when implementing active objects; guards can be used to ensure that the active object maintains consistent state and preserves any necessary invariants.

The priority value is used during write operations to determine a runnable's insertion point within the server's input queue, such that the set of unprocessed and eligible runnables are retrieved in priority order by the server.

The number of runnable servers to create for the internal pool may be specified when the server pool instance is created. A server pool instance does not create the RWRunnableServer instances for the pool, and does not process any enqueued runnables until the start() member is called. No runnables may be enqueued until the server pool is started.

The size of the runnable server pool may be adjusted after construction using the resize() member.

The stop() member is used to initiate server pool shutdown. The server pool continues to dispatch any runnables already enqueued when stop() is called, but no additional runnables may be enqueued after that point. Once the pending runnables have been dispatched, the server pool thread stops and joins with the runnable servers in the pool and then exits. The stop function does not wait for the server to stop; to wait for the server pool thread to complete its shutdown exit, use the join() function.

The RWRunnable::requestCancellation() function should be used if the server thread is to stop execution as soon as possible without dequeuing and dispatching any additional runnables.

The RWRunnable::requestInterrupt() function can be used to temporarily suspend execution of the server thread.

Example: #include <rw/thread/RWServerPool.h>

#include <rw/thread/RWRunnable.h>

RWServerPool serverPool(RWServerPool::make(4));

serverPool.start();

RWRunnable runnable = RWRunnableFunction::make(function);

serverPool.enqueue(runnable);

// ...

serverPool.stop();

serverPool.join();

// See the servpool.cpp example program for details

See also: RWRunnable, RWThread, RWRunnableServer, RWThreadAttribute

Constructor & Destructor Documentation

RWServerPool::RWServerPool ( )

inline

Constructs an empty (invalid) handle.

RWServerPool::RWServerPool ( const RWServerPool & second )

inline

Constructs an external interface handle to the server pool object pointed to by a second handle second (if any).

RWServerPool::~RWServerPool ( )

inline

Destructor.

Member Function Documentation

RWThreadAttribute RWServerPool::getPoolAttribute ( )

Gets a handle to the thread attribute instance specified during server pool construction or the instance specified in the last call to setPoolAttribute(). May raise RWTHRInvalidPointer or RWTHRInternalError.

static RWServerPool RWServerPool::make ( size_t numThreads )

static

Makes a runnable server pool instance with the specified number of pool threads. The server pool's main thread and its pool threads are created with default thread attributes.

static RWServerPool RWServerPool::make	(	size_t	numThreads,
		size_t	maxCapacity
	)

static

Makes a runnable server pool instance with the specified number of pool threads and whose input queue has the specified maximum capacity. The server pool's main thread and its pool threads are created with default thread attributes.

static RWServerPool RWServerPool::make	(	const RWThreadAttribute &	serverThreadAttr,
		size_t	numThreads
	)

static

Makes a server pool instance whose main thread has the specified thread attributes, and whose pool contains numThreads threads, each with a default set of thread attributes.

static RWServerPool RWServerPool::make	(	const RWThreadAttribute &	serverThreadAttr,
		size_t	numThreads,
		size_t	maxCapacity
	)

static

Makes a server pool instance whose main thread has the specified thread attributes; whose pool contains numThreads threads, each with a default set of thread attributes; and whose input queue has the specified maximum capacity.

static RWServerPool RWServerPool::make	(	size_t	numThreads,
		const RWThreadAttribute &	poolThreadsAttr
	)

static

Makes a server pool instance whose main thread has the default thread attributes, and whose pool contains numThreads threads, each with the specified set of thread attributes.

static RWServerPool RWServerPool::make	(	size_t	numThreads,
		const RWThreadAttribute &	poolThreadAttr,
		size_t	maxCapacity
	)

static

Makes a server pool instance whose main thread has the default thread attributes; whose pool contains numThreads threads, each created with the specified set of thread attributes; and whose input queue has the specified maximum capacity.

static RWServerPool RWServerPool::make	(	const RWThreadAttribute &	serverThreadAttr,
		size_t	numThreads,
		const RWThreadAttribute &	poolThreadsAttr
	)

static

Makes a server pool instance whose main thread has the thread attributes specified by the thread attribute object serverThreadAttr, and whose pool contains numThreads threads, each created with the thread attributes specified by the thread attribute object poolThreadsAttr.

static RWServerPool RWServerPool::make	(	const RWThreadAttribute &	serverThreadAttr,
		size_t	numThreads,
		const RWThreadAttribute &	poolThreadsAttr,
		size_t	maxCapacity
	)

static

Makes a server pool instance whose main thread has the thread attributes specified by the thread attribute object serverThreadAttr; whose pool contains numThreads threads, each created with the thread attributes specified by the thread attribute object poolThreadsAttr; and whose input queue has the specified maximum capacity.

RWServerPool & RWServerPool::operator= ( const RWServerPool & second )

inline

Binds this external interface handle to the server pool object, if any, pointed to by a second handle second.

void RWServerPool::resize ( size_t size )

Changes the number of threads within the thread pool. If the new thread pool size is less than the current size, then a sufficient number of threads are destroyed, but only after they have completed execution of any assigned runnable object. If the size is greater than the current size, the pool server thread creates a sufficient number of new threads and adds them to the pool. May raise RWTHRInvalidPointer or RWTHRInternalError.

void RWServerPool::setPoolAttribute ( const RWThreadAttribute & poolThreadsAttr )

Changes the thread attribute instance used to initialize new runnable server objects as they are created for the thread pool. Changing the pool thread attributes after the server has started will affect only new threads started by the pool server in response to a request for a larger pool size; existing threads continue with their original attributes. May raise RWTHRInvalidPointer or RWTHRInternalError.

size_t RWServerPool::size ( ) const

Returns the target size for the thread pool. May be less than or greater than the actual number of runnable server instances in the pool, since the pool server thread may not yet have completed a previously requested expansion or contraction of the thread pool. May raise RWTHRInvalidPointer or RWTHRInternalError.

SourcePro® API Reference Guide

Public Member Functions

Static Public Member Functions

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation