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

Concurrent Access

The member classes const_accessor and accessor are called accessors. Accessors allow multiple threads to concurrently access pairs in a shared concurrent_hash_map. An accessor acts as a smart pointer to a pair in a concurrent_hash_map. It holds an implicit lock on a pair until the instance is destroyed or the release method is called on the accessor.

The const_accessor and accessor classes differ in the kind of access they permit, as shown in Table 5-4.

Table 5-4. Differences between const_accessor and accessor

Class

value_type

Implied lock on pair

const_accessor

const std::pair<const Key,T>

Reader lock: permits shared access with other readers

accessor

std::pair<const Key,T>

Writer lock: blocks access by other threads

Accessors cannot be assigned or copy-constructed because allowing that would greatly complicate the locking semantics.

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