tracing pthreads in linux?

Question

I did not find any tool created for tracing pthread's threads in linux process. I want something like strace/ltrace, is there something to view calls in real-time? Thank you

Answer 1

strace works for threads as well. Use strace -f to strace all threads.

To strace only a particular thread, you first have to find its tid (thread id). Threads have thread id's that's really a pid (process id)

Once you know the pid of the thread, use strace -p the_pid to strace that thread.

The pids of all the threads in a process can be found in /proc/<pid>/task/ , or the current thread id can be learned with the gettid() C call.

Answer 2

actually strace is not as good as perf .

use perf tool , you can get more information.

for example, if some of your threads hangs , and you want to find out what functions calls that hangs, use strace -p pid-id returns limited information, but perf top , or perf -t tid returns more