Thread-specific data

Question

If we want to use thread specific data in a multithreaded application, how to access those data from another collector thread periodically? Is it possible?

Regards Ram

Answer 1

Yes, all the threads in the process (application) share the same memory. Just give the address of the data to the collector thread. Be careful with concurrent access: reading some parts of the memory while it's being updated. You might need to protect some memory zones with mutex.

Answer 2

Under certain systems it is possible to create variables in so-called thread-local storage . Gcc manual explains how you can achieve it and provides the link to Drepper's article, that explains technical details. This is a C standard extension, so under your system there should be a different mechanism.