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Feature: thread_local

  • Eingeführt in: C++11


thread_local varType varName;
thread_local unsigned int counter;
thread_local std::string s = "getting schwifty";

Use Cases

thread_local Entities have thread storage duration. This mean that every single thread in a program has its own copy of its thread_local Entity. thread_local Entities are implicit static and get destroyed upon thread exit.

The best way to avoid data races is not sharing the data between threads. By using thread_local variables, each thread will have its own copy of the data, and this data can only be written or reading by its own thread.

Motivation für die Einführung

Vorherige Lösungsansätze


  • Thead Local variables can't be acceded by other threads, UNLESS the programmer gives a pointer to the thread local variable.
  • Thread local cannot be used on function declarations or definitions.