How to get a thread ID?

[Václav Haisman]

Kostik Belousov wrote, On 3.6.2010 17:19:
> On Thu, Jun 03, 2010 at 09:44:52AM -0500, Dan Nelson wrote:
>> In the last episode (Jun 03), V??clav Haisman said:
>>> is it possible to obtain some sort of a thread ID that identifies a thread
>>> within a process other than pthread_self()?  Something like gettid() on
>>> Linux?  Apparently, on FreeBSD the pthread_t is a pointer type and does
>>> not identify the thread well enough.  GDB on FreeBSD seems to know about
>>> threads and does not seem to use the same ID as is pthread_t.
>>
>> The return value of pthread_self() is a pointer to the (private) "struct
>> pthread" for the current thread, and should uniquely identify a thread.  Do
>> you have a testcase that shows otherwise?  GDB might just enumerate the
>> currently active threads starting from 1.
> 
> There is thr_self(2) undocumented syscall:
> int thr_self(long *id);
Thanks, I'll try it. Is the returned ID the LWP ID that GDB shows?

--
VH

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