Provided by: manpages-dev_2.17-1_all
gettid - get thread identification
gettid() returns the thread ID of the current process. This is equal to
the process ID (as returned by getpid(2)), unless the process is part
of a thread group (created by specifying the CLONE_THREAD flag to the
clone(2) system call). All processes in the same thread group have the
same PID, but each one has a unique TID.
On success, returns the thread ID of the current process.
This call is always successful.
gettid() is Linux specific and should not be used in programs that are
intended to be portable.
clone(2), fork(2), getpid(2)