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Note: There is no glibc wrapper for this system call; see NOTES.
gettid() returns the caller's thread ID (TID). In a single-threaded
process, the thread ID is equal to the process ID (PID, as returned by
getpid(2)). In a multithreaded process, all threads have the same PID,
but each one has a unique TID. For further details, see the discussion
of CLONE_THREAD in clone(2).
On success, returns the thread ID of the calling process.
This call is always successful.
The gettid() system call first appeared on Linux in kernel 2.4.11.
gettid() is Linux-specific and should not be used in programs that are
intended to be portable.
Glibc does not provide a wrapper for this system call; call it using
The thread ID returned by this call is not the same thing as a POSIX
thread ID (i.e., the opaque value returned by pthread_self(3)).
capget(2), clone(2), fcntl(2), fork(2), get_robust_list(2), getpid(2),
ioprio_set(2), perf_event_open(2), sched_setaffinity(2), sched_set-
param(2), sched_setscheduler(2), tgkill(2), timer_create(2)
Linux 2014-02-11 GETTID(2)