[lldb-dev] Associating SBThread with a native thread

[Mario Zechner]

Awesome, thanks for the help guys!
On Jan 8, 2015 7:56 PM, "Jason Molenda" <jason at molenda.com> wrote:

>
> > On Jan 8, 2015, at 8:26 AM, Mario Zechner <badlogicgames at gmail.com>
> wrote:
> >
> > Hi,
> >
> > we are currently trying work around some issues with rapid
> suspend/resume. We essentially setup a thread in the inferior with which we
> communicate via TCP to get informed of events such as thread start/stop
> without having to set breakpoints and stopping the inferior.
> >
> > Eventually we need to associate the native threads with the SBThread we
> get from LLDB's API. SBThread has an id and an index, but those don't seem
> to map to anything on the inferior side (e.g. the pthread id of the thread).
> >
> > Is there a way to perform this association?
>
> As Greg said, on Mac OS X each thread created by the system since the last
> reboot is assigned an incrementing number, the globally unique thread id.
> That's what lldb and sample use as the thread identifiers -- pthread_t
> values may be reused by the system during a process lifetime as threads are
> created and destroyed.
>
> You can get the globally unique thread id for the current thread via the
> nonportable pthread_threadid_np() call.  e.g.
>
> (lldb) thread info
> thread #1: tid = 0x088f, 0x00007fff856b352e
> libsystem_kernel.dylib`mach_msg_trap + 10, queue = 'com.apple.main-thread',
> stop reason = signal SIGSTOP
>
> (lldb) p/x (void*)malloc(8)
> (void *) $2 = 0x0000620000007a00
>
> (lldb) p/d (uint64_t) pthread_threadid_np(0, $2)
> (uint64_t) $3 = 0
>
> (lldb) x/gx $2
> 0x620000007a00: 0x000000000000088f
>
>
>
> J
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