[Bug libc/6399] gettid() should have a wrapper

["nmiell at gmail dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=6399

--- Comment #25 from Nicholas Miell <nmiell at gmail dot com> ---
Should gettid() actually be exposed to userspace? My suggestion in bug 14300
was the introduction of a pid_t "pthread_gettid_np(pthread_t *thr)" (which,
naturally, could take pthread_self() as an argument).

Leaving gettid() hidden and only exposing the pthread function would act as an
implicit hint that you really should be using the pthread functions where
possible.

As such, acknowledging that the following functions take tids would be a
mistake:

sched_getaffinity()
sched_setaffinity()
sched_getparam() 
sched_setparam()
sched_getscheduler()
sched_setscheduler()

because the following functions already exist:

pthread_getaffinity_np() pthread_attr_getaffinity_np()
pthread_setaffinity_np() pthread_attr_setaffinity_np()
pthread_getschedparam() pthread_attr_getschedparam()
pthread_setschedparam() pthread_attr_setschedparam()
pthread_attr_getschedpolicy()
pthread_attr_setschedpolicy()

And ideally the other functions like fcntl() or timer_create() would get small
wrappers that that transparently convert a pthread_t to a tid before invoking
the system call.

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