RWTPCValQueue< Type > Class Template Reference

First-in-first-out (FIFO) queue that provides producer-consumer synchronization semantics for exchanging values between cooperating threads. More...

#include <rw/itc/RWTPCValQueue.h>

Inheritance diagram for RWTPCValQueue< Type >:

Public Member Functions
	RWTPCValQueue (size_t maxCapacity)
	RWTPCValQueue (size_t maxCapacity, bool isOpen)
	RWTPCValQueue (void)
	~RWTPCValQueue (void)
Public Member Functions inherited from RWTPCValBufferBase< Type >
virtual	~RWTPCValBufferBase (void)
RWWaitStatus	peek (Type &result, unsigned long milliseconds)
Type	peek (void)
RWWaitStatus	read (Type &result, unsigned long milliseconds)
Type	read (void)
bool	tryPeek (Type &result)
bool	tryRead (Type &result)
bool	tryWrite (const Type &value)
void	write (const Type &value)
RWWaitStatus	write (const Type &value, unsigned long milliseconds)
Public Member Functions inherited from RWPCBufferBase
virtual	~RWPCBufferBase (void)
bool	canRead (void) const
bool	canWrite (void) const
void	close (void)
size_t	entries (void) const
void	flush (void)
size_t	getCapacity (void) const
RWTFunctor< void()>	getCloseCallback (void) const
RWTFunctor< void()>	getEmptyCallback (void) const
RWTFunctor< void()>	getFullCallback (void) const
RWTFunctor< void()>	getOpenCallback (void) const
bool	isOpen (void) const
void	open (void)
size_t	setCapacity (size_t maxCapacity)
void	setCloseCallback (const RWTFunctor< void()> &onCloseCallback)
void	setEmptyCallback (const RWTFunctor< void()> &onEmptyCallback)
void	setFullCallback (const RWTFunctor< void()> &onFullCallback)
void	setOpenCallback (const RWTFunctor< void()> &onOpenCallback)

Additional Inherited Members
Protected Types inherited from RWTMonitor< RWMutexLock >
typedef RWTLockGuard< RWTMonitor< RWMutexLock > >	LockGuard
typedef RWTTryLockGuard< RWTMonitor< RWMutexLock > >	TryLockGuard
typedef RWTUnlockGuard< RWTMonitor< RWMutexLock > >	UnlockGuard
Protected Member Functions inherited from RWTMonitor< RWMutexLock >
	RWTMonitor (const RWTMonitor< RWMutexLock > &second)
	RWTMonitor (RWStaticCtor)
	RWTMonitor (void)
	~RWTMonitor (void)
void	acquire (void)
bool	isAcquired (void) const
RWTMonitor< RWMutexLock > &	monitor (void) const
RWMutexLock &	mutex (void)
RWTMonitor< RWMutexLock > &	operator= (const RWTMonitor< RWMutexLock > &)
void	release (void)
bool	tryAcquire (void)

Detailed Description

template<class Type>
class RWTPCValQueue< Type >

RWTPCValQueue is a first-in-first-out (FIFO) queue that provides producer-consumer synchronization semantics for exchanging values between cooperating threads.

In the producer-consumer synchronization model, reader threads (consumers) are blocked while the queue is empty, and writer threads (producers) are blocked while the queue is full. A queue is considered full when the number of unread entries equals or exceeds some user-specified maximum capacity.

Example

// This program uses reader and writer threads to
// copy text from standard input to standard output
// via a producer-consumer queue:
 
#include <rw/thread/RWThread.h>
#include <rw/thread/RWThreadFunction.h>
#include <rw/itc/RWTPCValQueue.h>
#include <iostream>
 
// A producer-consumer queue with buffer size of 10:
RWTPCValQueue<char> pcQueue(10);
 
void readerThread() {
  // Read chars from queue and send to stdout. Quit when
  // sentinel NULL char is received:
  char c;
  while ((c = pcQueue.read()) != '\0') {
    std::cout << c << std::flush;
  }
}
 
void writerThread() {
  // Get chars from stdin and write to queue. Send the NULL
  // char and quit when stream error or EOF occurs:
  char c;
  do {
    std::cin.get(c);
    pcQueue.write(std::cin.good() ? c : '\0');
  } while (std::cin.good());
}
 
int main() {
  RWThread reader = RWThreadFunction::make(readerThread);
  RWThread writer = RWThreadFunction::make(writerThread);
  reader.start();
  writer.start();
  reader.join();
  writer.join();
  return 0;
}

Constructor & Destructor Documentation

RWTPCValQueue() [1/3]

template<class Type >

RWTPCValQueue< Type >::RWTPCValQueue ( void )

inline

Constructs a value-based producer-consumer queue instance.

The queue is open on construction and enforces no limit on the number of items in the queue.

RWTPCValQueue() [2/3]

template<class Type >

RWTPCValQueue< Type >::RWTPCValQueue ( size_t maxCapacity )

inline

Constructs a value-based producer-consumer queue instance.

The parameter maxCapacity specifies the maximum number of unread entries to allow to accumulate within the queue. Once the number of entries in the queue equals this number, any thread attempting to write an additional entry is blocked until an entry is removed by a read() operation, or until the capacity is increased. A capacity of zero is used to indicate that the queue has no size limit other than that imposed by memory limitations, and that all write() operations should complete without blocking.

The queue is open on construction.

RWTPCValQueue() [3/3]

template<class Type >

RWTPCValQueue< Type >::RWTPCValQueue ( size_t maxCapacity, bool isOpen )

inline

Constructs a value-based producer-consumer queue instance.

The parameter maxCapacity specifies the maximum number of unread entries to allow to accumulate within the queue. Once the number of entries in the queue equals this number, any thread attempting to write an additional entry is blocked until an entry is removed by a read() operation, or until the capacity is increased. A capacity of zero is used to indicate that the queue has no size limit other than that imposed by memory limitations, and that all write() operations should complete without blocking.

The parameter isOpen is a bool value that specifies whether the queue should be initialized in the open state, true, or the closed state, false.

~RWTPCValQueue()

template<class Type >

RWTPCValQueue< Type >::~RWTPCValQueue ( void )

inline

Destructor.