I'm debugging an app with many threads, so I've named them using prctl. This works great with gdb's info threads option, but it would be nice if thread * apply all operations showed it as well. Any way to coerce gdb to do this?
(gdb) info threads
Id Target Id Frame
...
3 Thread 0x7ffff6ffe700 (LWP 30048) "poll_uart_threa" 0x00007ffff78eb823 in select ()
at ../sysdeps/unix/syscall-template.S:82
2 Thread 0x7ffff77ff700 (LWP 30047) "signal hander" do_sigwait (set=<optimized out>,
sig=0x7ffff77feed8)
at ../nptl/sysdeps/unix/sysv/linux/../../../../../sysdeps/unix/sysv/linux/sigwait.c:65
* 1 Thread 0x7ffff7fcc700 (LWP 30046) "simulator" __lll_lock_wait ()
at ../nptl/sysdeps/unix/sysv/linux/x86_64/lowlevellock.S:132
Pointer, PID {well, thread ID, but LWP threads == processes, ish}, and name
(gdb) thread apply all bt
...
Thread 3 (Thread 0x7ffff6ffe700 (LWP 30048)):
#0 0x00007ffff78eb823 in select () at ../sysdeps/unix/syscall-template.S:82
#1 0x0000000000403bb3 in poll_uart_thread (unused=0x0) at uart.c:96
#2 0x00007ffff7bc4e9a in start_thread (arg=0x7ffff6ffe700) at pthread_create.c:308
#3 0x00007ffff78f24bd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#4 0x0000000000000000 in ?? ()
Thread 2 (Thread 0x7ffff77ff700 (LWP 30047)):
<call stack>
#2 0x0000000000417a89 in sig_thread (arg=0x7fffffffbb60) at simulator.c:879
#3 0x00007ffff7bc4e9a in start_thread (arg=0x7ffff77ff700) at pthread_create.c:308
#4 0x00007ffff78f24bd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#5 0x0000000000000000 in ?? ()
Thread 1 (Thread 0x7ffff7fcc700 (LWP 30046)):
<call stack>
#9 0x00000000004182e3 in simulator (flash_file=0x7fffffffe0e4 "../programs/blink.bin")
at simulator.c:1005
#10 0x0000000000401f14 in main (argc=3, argv=0x7fffffffdd48) at cli.c:167
While I can find the name by hunting the call stack, it'd be nice / convenient / etc if it would print in the summary line, which here only has PID and pointer.
There's no easy way, you have to patch GDB. It's a simple patch, you can find it here.