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Document number: P0206R1

Date: 2016-03-09

A joining thread

by Ville Voutilainen

Excerpt:

Changes from previous version

• This paper revises P0206R0.
• Removed the motivation elaboration, it can be found in the previous revision.
• Removed the discarded solutions.
• Added explanation for the std::thread-accessing functions and discarded alternatives for it.
• Renamed safe_thread to joining_thread.
• Used thread::id and thread::native_handle_type in joining_thread.
• Updated proposed wording.

Abstract

C++ continues not to provide a thread type that would join() automatically on scope exit. This causes exception-safety problems, because failing to join() in all code paths causes the destructor of a std::thread to terminate(). This paper provides a solution that adds a new thread type that joins in its destructor, and is based on large-group and LEWG feedback given in Jacksonville. The proposal has been implemented and tested.