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ost::ThreadQueue(3) Library Functions Manual ost::ThreadQueue(3)

NAME

ost::ThreadQueue - Somewhat generic queue processing class to establish a producer consumer queue.

SYNOPSIS

#include <buffer.h>

Inherits ost::Mutex, ost::Thread, and ost::Semaphore.

Classes


struct _data

Public Member Functions


ThreadQueue (const char *id, int pri, size_t stack=0)
Create instance of our queue and give it a process priority. virtual ~ThreadQueue ()
Destroy the queue. void setTimer (timeout_t timeout)
Set the queue timeout. void post (const void *data, unsigned len)
Put some unspecified data into this queue.

Protected Types


typedef struct ost::ThreadQueue::_data data_t

Protected Member Functions


virtual void final ()
virtual void startQueue (void)
Start of dequeing. virtual void stopQueue (void)
End of dequeing, we expect the queue is empty for now. virtual void onTimer (void)
A derivable method to call when the timout is expired. virtual void runQueue (void *data)=0
Virtual callback method to handle processing of a queued data items.

Protected Attributes


timeout_t timeout
bool started
data_t * first
data_t * last
String name

Additional Inherited Members

Detailed Description

Somewhat generic queue processing class to establish a producer consumer queue.

This may be used to buffer cdr records, or for other purposes where an in-memory queue is needed for rapid posting. This class is derived from Mutex and maintains a linked list. A thread is used to dequeue data and pass it to a callback method that is used in place of 'run' for each item present on the queue. The conditional is used to signal the run thread when new data is posted.

This class was changed by Angelo Naselli to have a timeout on the queue

in memory data queue interface.

Author

David Sugar dyfet@ostel.com

Member Typedef Documentation

typedef struct ost::ThreadQueue::_data ost::ThreadQueue::data_t [protected]

Constructor & Destructor Documentation

ost::ThreadQueue::ThreadQueue (const char * id, int pri, size_t stack = 0)

Create instance of our queue and give it a process priority.

Parameters

id queue ID.
pri process priority.
stack stack size.

virtual ost::ThreadQueue::~ThreadQueue () [virtual]

Destroy the queue.

Member Function Documentation

virtual void ost::ThreadQueue::final () [protected], [virtual]

Reimplemented from ost::Thread.

virtual void ost::ThreadQueue::onTimer (void) [protected], [virtual]

A derivable method to call when the timout is expired.

void ost::ThreadQueue::post (const void * data, unsigned len)

Put some unspecified data into this queue. A new qd structure is created and sized to contain a copy of the actual content.

Parameters

data pointer to data.
len size of data.

virtual void ost::ThreadQueue::runQueue (void * data) [protected], [pure virtual]

Virtual callback method to handle processing of a queued data items. After the item is processed, it is deleted from memory. We can call multiple instances of runQueue in order if multiple items are waiting.

Parameters

data item being dequed.

void ost::ThreadQueue::setTimer (timeout_t timeout)

Set the queue timeout. When the timer expires, the onTimer() method is called for the thread

Parameters

timeout timeout in milliseconds.

virtual void ost::ThreadQueue::startQueue (void) [protected], [virtual]

Start of dequeing. Maybe we need to connect a database or something, so we have a virtual...

virtual void ost::ThreadQueue::stopQueue (void) [protected], [virtual]

End of dequeing, we expect the queue is empty for now. Maybe we need to disconnect a database or something, so we have another virtual.

Member Data Documentation

data_t* ost::ThreadQueue::first [protected]

data_t * ost::ThreadQueue::last [protected]

String ost::ThreadQueue::name [protected]

bool ost::ThreadQueue::started [protected]

timeout_t ost::ThreadQueue::timeout [protected]

Author

Generated automatically by Doxygen for GNU CommonC++ from the source code.
Sat Dec 28 2019 GNU CommonC++