Note:
You can use the following commands to display threads:
show_thread_command
: show thread [ thread_id_list ] [ thread-state-filter ]
thread_id_list
: thread_id ,...
| *
thread_id
thread_state_filter
: with state eq thread_state
: == (for C and C++)
| .eq. (for Fortran)
thread_state
: ready
| running
| terminated
| blocked
Use the show thread command without parameters to list all the threads known to the debugger.
If you specify one or more thread identifiers, the debugger displays information about the threads you specify, if the thread matches what you specified in the list. If you omit a thread specification, the debugger displays information for all threads.
Use the show thread commands to list threads that have specific characteristics, such as threads that are currently blocked. For example:
(idb) print $threadlevel
"pthreads"
(idb) show thread
Thread Name State Substate Policy Pri
------ ------------------------- --------------- ----------- ------------ ---
* 1 default thread running VP 3 SCHED_OTHER 19
-1 manager thread blk SCS SCHED_RR 19
-2 null thread for slot 0 running VP 1 null thread -1
-3 null thread for slot 1 ready VP 3 null thread -1
-4 null thread for slot 2 new new null thread -1
-5 null thread for slot 3 new new null thread -1
> 2 threads(0x140000798) blocked cond 3 SCHED_OTHER 19
3 threads+8(0x1400007a0) blocked cond 3 SCHED_OTHER 19
4 threads+16(0x1400007a8) blocked cond 3 SCHED_OTHER 19
5 threads+24(0x1400007b0) blocked cond 3 SCHED_OTHER 19
6 threads+32(0x1400007b8) blocked cond 3 SCHED_OTHER 19
(idb) set $threadlevel = "pthreads"
(idb) print $threadlevel
"pthreads"
(idb) show thread
Id State
* 0x9 stopped
* 0x9 unstarted
0x3 unstarted
0x7 unstarted
: info threads
Use the info threads command to list all the threads known to the debugger.
(idb) info threads
0 Thread 1024 (LWP 19513) 0x804f8f6 in __sigsuspend from /tmp/pthread_manythreads
1 Thread 2049 (LWP 19514) 0x805a42a in __clone from /tmp/pthread_manythreads
* 2 Thread 1026 (LWP 19515) 0x804f8f6 in __sigsuspend from /tmp/pthread_manythreads
3 Thread 2051 (LWP 19516) 0x804f8f6 in __sigsuspend from /tmp/pthread_manythreads
4 Thread 3076 (LWP 19517) 0x804f8f6 in __sigsuspend from /tmp/pthread_manythreads
5 Thread 4101 (LWP 19518) 0x8048288 in prime_search at pthread_manythreads.c:79
Note:
In the output, the right bracket indicator (>) marks the current thread, whereas the asterisk (*) indicator marks the thread with the event that stopped the application.
You can switch to a different thread as the current thread. The debugger variable $curthread contains the thread identifier of the current thread.
: thread [ thread_id ]
The $curthread value is updated when program execution stops or completes. You can modify the current thread by assigning $curthread a valid thread identifier. This is equivalent to issuing the thread thread_id command. When there is no process or program, $curthread is set to 0.
Use the thread command without a thread identifier to identify the current thread. Supply a thread identifier to make another thread the current thread.
(idb) thread 2
* 2 Thread 1026 (LWP 19515) 0x804f8f6 in __sigsuspend from /tmp/pthread_manythreads