gettid - get thread identification
() 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
(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
On success, returns the thread ID of the calling thread.
This call is always successful.
() system call first appeared on Linux in kernel 2.4.11.
Library support was added in glibc 2.30. (Earlier glibc versions did not
provide a wrapper for this system call, necessitating the use of
() is Linux-specific and should not be used in programs that are
intended to be portable.
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
In a new thread group created by a clone
(2) call that does not specify
flag (or, equivalently, a new process created by
(2)), the new process is a thread group leader, and its thread
group ID (the value returned by getpid
(2)) is the same as its thread ID
(the value returned by gettid