GETTID(2) Linux Programmer s Manual GETTID(2)

NAME gettid - get thread identification

SYNOPSIS #include <sys/types.h>

pid_t gettid(void);

DESCRIPTION gettid() returns the callers 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).

RETURN VALUE On success, returns the thread ID of the calling process.

ERRORS This call is always successful.

VERSIONS The gettid() system call first appeared on Linux in kernel 2.4.11.

CONFORMING TO gettid() is Linux-specific and should not be used in programs that are intended to be portable.

NOTES 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)).

SEE ALSO clone(2), fork(2), getpid(2)

COLOPHON This page is part of release 3.22 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at

Linux 2008-04-14 GETTID(2)