Hi all,
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
+1
A:
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.
philippe
2009-09-02 06:21:20
Thanks! So do you mean that, we need to put addresses allocated in all threads for my data in a common list or something, where the collector thread can go and refer, access and fetch data? In a synchrnoized way?
Aviator
2009-09-02 06:25:40
Yes, or you can pass the address[es] to your collector thread when you create it.
philippe
2009-09-02 17:56:00
Thanks phillipe!
Aviator
2009-09-02 18:22:50
A:
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.
Pavel Shved
2009-09-02 08:59:55
It seems to be very infromative. THanks a lot. I will have a look at it.
Aviator
2009-09-02 09:10:58