libpthread_dbg(3) is a remnant library from the M:N thread model (pre-NetBSD-5.0) API to introspect threads within a process and for use of a debuggers.
Currently in the 1:1 model it's not used in GDB neither in LLDB and it's not either planned to be used. It's current function to read pthread_t structures is realizable within a regular debugger capable to instrospect objects within a tracee (GDB, LLDB...). I'm going to: - detach from GDB in the base, - detach it from GDB in pkgsrc, - send upstream a patch removing it from GDB, - import libpthread_dbg(3) to pkgsrc for those who still might depend on it, - remove it from the base distribution. The current function to iterate over threads is realizable with ptrace(2) and the PT_LWPINFO operation. In the past libpthread_dbg was a part of the FreeBSD distribution but it was removed from there long time ago.
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