gdb info threads

(gdb) info threads 
  11 Thread 0x7f82c6462700 (LWP 30865)  0x00007f82c7676b50 in sem_wait () from /lib/libpthread.so.0 
  10 Thread 0x7f82c5c61700 (LWP 30866)  0x00007f82c7676b50 in sem_wait () from /lib/libpthread.so.0 
  9 Thread 0x7f82c5460700 (LWP 30867)  0x00007f82c7676b50 in sem_wait () from /lib/libpthread.so.0 
  8 Thread 0x7f82c4c5f700 (LWP 30868)  0x00007f82c7676b50 in sem_wait () from /lib/libpthread.so.0 
  7 Thread 0x7f82c445e700 (LWP 30869)  0x00000000004a3c37 in PyEval_EvalFrameEx () 
  6 Thread 0x7f82c3c5d700 (LWP 30870)  0x00007f82c7676dcd in sem_post () from /lib/libpthread.so.0 
  5 Thread 0x7f82c345c700 (LWP 30871)  0x00007f82c7676b50 in sem_wait () from /lib/libpthread.so.0 
  4 Thread 0x7f82c2c5b700 (LWP 30872)  0x00007f82c7676b50 in sem_wait () from /lib/libpthread.so.0 
  3 Thread 0x7f82c245a700 (LWP 30873)  0x00007f82c7676b50 in sem_wait () from /lib/libpthread.so.0 
  2 Thread 0x7f82c1c59700 (LWP 30874)  0x00007f82c7676b50 in sem_wait () from /lib/libpthread.so.0 
* 1 Thread 0x7f82c7a7c700 (LWP 30864)  0x00007f82c7676b50 in sem_wait () from /lib/libpthread.so.0

 

(gdb) thread 11 
[Switching to thread 11 (Thread 0x7f82c6462700 (LWP 30865))] #0  0x00007f82c7676b50 in sem_wait () from /lib/libpthread.so.0 
(gdb) where 
#0  0x00007f82c7676b50 in sem_wait () from /lib/libpthread.so.0 
#1  0x00000000004d4498 in PyThread_acquire_lock () 
#2  0x00000000004a2f3f in PyEval_EvalFrameEx () 
#3  0x00000000004a9671 in PyEval_EvalCodeEx ()