Switch to thread using GDB

Question

I debug a multi thread process using GDB.

When I pause the debug to run some commands in GDB termial, how can I switch to another thread context?

When I stop debugging GDB is always on the main thread, but I want to switch for example to thread 1234

Answer 1

you can get thread_id from this command, such as "helloworld" thread

ps -o comm,tid -T `pgrep your_process_name` | grep helloworld
helloworld 12345

and lookup for thread number of it in gdb

gdb attach `pgrep your_process_name`
thread find 12345

Thread 3 has target id 'LWP 12345'

then switch to it

thread 3