Manpage of GETTID
GETTIDSection: Linux Programmer's Manual (2)
NAMEgettid - get thread identification
#include <sys/types.h>pid_t gettid(void);
DESCRIPTIONgettid() 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_THREADin clone(2).
RETURN VALUEOn success, returns the thread ID of the calling process.
ERRORSThis call is always successful.
VERSIONSThe gettid() system call first appeared on Linux in kernel 2.4.11.
CONFORMING TOgettid() is Linux-specific and should not be used in programs that are intended to be portable.
NOTESGlibc 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)).
In a new thread group created by a clone(2) call that does not specify the CLONE_THREADflag (or, equivalently, a new process created by fork(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()).
SEE ALSOcapget(2), clone(2), fcntl(2), fork(2), get_robust_list(2), ioprio_set(2), perf_event_open(2), sched_setaffinity(2), sched_setparam(2), sched_setscheduler(2), tgkill(2), timer_create(2)
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