GETTID(2) Linux Programmer's Manual GETTID(2)NAMEgettid - get thread identification
SYNOPSIS
#include <sys/types.h>
pid_t gettid(void);
DESCRIPTIONgettid() 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.
RETURN VALUE
On success, returns the thread ID of the current process.
ERRORS
This call is always successful.
CONFORMING TOgettid() 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).
SEE ALSOclone(2), fork(2), getpid(2)Linux 2.4.20 2007-06-01 GETTID(2)