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Cable TV distribution systems play an important role in delivering broadband services CATV systems distribute RF signals from a central location, called the headend , to the end subscriber nodes The current cable distribution systems include a combination of coaxial cable with ber optic cable, and are commonly called hybrid ber coax (HFC) networks New cable-based services, such as Internet access and digital telephone, provide interactive connectivity to the end user, so the cable system needs to be bidirectional This chapter deals with DOCSIS, a technical standard developed originally by CableLabs, which de nes a transmission mechanism to provide data network connectivity through an HFC cable system

Leaving an Unowned Critica l Section It is a very serious bug to try to leave a critical section that isn't owned by the current thread In all cases, this indicates a programming error, and, if it ever occurs, there is no imme diate indication that something has gone wrong There is no error code or exception Despite the appearance that all is well, a ticking time bomb has been left behind If the critical section is completely unowned at the time of the erroneous call to L e a v e C r i t i c a l S e c t i o n , all future calls to E nt e r C r it i c a l S e c t i o n will block forever This effectively deadlocks all threads that later try t o use this critical section If the section is owned by another thread when the unowning thread tries to leave it, the current owner is still permitted to reacquire and release the lock recursively But once the owner exits the lock completely, the lock has become permanently damaged: subsequent behav ior is identical to the case where no owner was initially present In other words, all subsequent calls to E nt e r C r it i c a l S e c t i o n by any thread in the system will block indefinitely Ensuring a Thread Always Leaves the Critical Section We usually want to ensure LeaveC r it i c a l S e c t i o n is called no matter the outcome of the crit ical region itself Please first recall the warnings about reliability and the possibility of leaving corrupt state in the wake of an unhandled exception

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stemming from a critical region Assuming we're convinced w e d o want this behavior, we can use a try / finally block

LeaveC r i t i c a lS e c t ion ( &m_c r st ) ;

A content distribution service provider has signed up a large corporate client to facilitate collaboration when working on all its marketing materials Over 100 people need copies at the client and its agencies, production houses, and consultants A rough cut on a new commercial has just been completed and must be distributed to everyone in the group The postproduction facility uses ClipMail Pro to deliver the commercial in MPEG format to the service provider, where a FlipFactory server flips the media into the format specified for each recipient, holding some for streaming and delivering high-quality MPEG to the desktops of those who want it The system administrator has performed most of the account setups, although some of the power users have optimized their settings at FlipFactory to ensure that they receive the media just as they want it Recipients are notified by e-mail with a link to the media or an attached file when flipping is complete The asset-management system handles the follow-on feedback and approval process

While this certainly does the trick and is a fairly simple pattern to follow, it' s easy to accidentally slip in a call to some function that might throw exceptions after the E nt e r C r it i c a l S e c t i o n but before the try block If an exception were thrown from such a function, the finally block will not run, leading to an orphaned lock and subsequent deadlocks Instead of writing this boilerplate everywhere, we can use a C++ holder type (see Further Reading, Meyers) A holder is a stack allocated object that manages a resource and takes advantage of C++'s implicit destructor invocation at the end of the scope in which it' s used for cleanup

# i n c l u d e <windows h > c l a s s C r stHolder LPCRITICAL_S ECTION m_pC rst ; public : C r stHolder ( LPCR ITICAL_S E CTION pCrst )

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