Dr. Dobb's Journal - November 2008 - (Page 44)

Core Technology WHAT’S NEW IN BOOST THREADS? Threads can now be transferred between objects Enhanced Condition Variables With Boost 1.35.0, the condition variable implementation was given a revamp to support interruption, and a new type of condition variable was added: boost::condition_variable_any. Whereas boost::condition_variable only works with boost::unique_lock (or its synonym, boost::mutex::scoped_lock), the wait functions for boost::condition_variable_any can be used with any mutex type. This means that you can now use boost::timed_mutex with boost::condition_variable_any, and boost::recursive_mutex (though care needs to be taken to ensure it isn’t recursively locked, as only one level of unlocking will be done by wait()). Even boost::shared_lock can be used, or a user-provided mutex type. boost::condition_variable_any cv; boost::shared_mutex sm; bool update_ready(); void process_shared_data(); void wait_for_data() { boost::shared_lock lk(sm); cv.wait(lk,update_ready); process_shared_data(); } has been a long time coming, and means that finally, you can specify timeouts as boost ::posix_time::milliseconds(50) (for example) rather than doing a dance with boost ::xtime. Absolute timeouts are still supported through the new boost ::system_time typedef (and xtime, for backwards compatibility), but all thread functions that take a timeout now accept both absolute and relative timeouts. Summary The Boost Thread library has undergone some major changes in 2008. These changes help pave the way for the upcoming C++0x Standard, and make it easier for users to write robust multithreaded programs. This isn’t the end of the line though: As the C++0x working draft evolves, the Boost Thread library will evolve with it, both to incorporate the changes and to provide a proving ground for new ideas. DDJ Date-Time Integration The final change since Boost 1.34 is the integration with Boost.DateTime. This Get data right AddressObject API Prevent errors before they occur to ensure the integrity of your database. Use AddressObject API to verify, cleanse and format customer data at the point of entry or in batch. Address Object easily integrates with Perl, PHP Java and .NET. , - offering a better way to build-in data validation. right from the start Get a FREE demo at: MelissaData.com/dobbs 44 1.800.MELISSA Dr. Dobb’s Journal l www.ddj.com l November 2008 http://www.abxsoft.com http://www.abxsoft.com http://www.MelissaData.com/dobbs http://www.MelissaData.com/dobbs http://www.ddj.com

Table of Contents Feed for the Digital Edition of Dr. Dobb's Journal - November 2008

Dr. Dobb's Journal - November 2008 Contents Friday Night Fish Fry Alia Vox Developer Diaries Developer's Notebook Saving Open Source Conversations iPhone Building Your Own Web Server Green Telnet What's New In Boost Threads? Testing Service Oriented Architectures Test Case Generation, UML, and Eclipse Unit Testing Web Services C3 Programming The Agile Edge Swaine's Flames Effective Concurrency

Dr. Dobb's Journal - November 2008

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