GETTID(2) Linux Programmer's Manual GETTID(2)
gettid - get thread identification
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 por-
Glibc does not provide a wrapper for this system call; call it using syscall(2).
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_setparam(2), sched_setscheduler(2),
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Linux 2013-02-04 GETTID(2)