Skip to Main Content
Intel Threading Building Blocks
book

Intel Threading Building Blocks

by James Reinders
July 2007
Intermediate to advanced content levelIntermediate to advanced
332 pages
10h 4m
English
O'Reilly Media, Inc.
Content preview from Intel Threading Building Blocks

Reader-Writer Mutexes

Mutual exclusion is necessary when at least one task writes to a shared variable. But it does no harm to permit multiple readers into a protected region. The reader-writer variants of the mutexes, denoted by _rw_ in the class names, enable multiple readers by distinguishing reader locks from writer locks. There can be more than one reader lock on a given mutex.

Requests for a reader lock are distinguished from requests for a writer lock via an extra Boolean parameter in the constructor for scoped_lock. The parameter is false to request a reader lock and true to request a writer lock. It defaults to true so that when it is omitted, a spin_rw_mutex or queuing_rw_mutex behaves like its non-_rw_ counterpart. The next section shows an example where the parameter is explicitly false in order to obtain a reader lock.

Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Start your free trial

You might also like

Intel® Xeon Phi™ Coprocessor Architecture and Tools: The Guide for Application Developers

Intel® Xeon Phi™ Coprocessor Architecture and Tools: The Guide for Application Developers

Rezaur Rahman

Publisher Resources

ISBN: 9780596514808Errata Page