11-18-2008
I think Apina does not understand Linux and is taking this thread in a direction that is getting very close to a rule violation.
Linux and UNIX are so similar, relatively speaking, that it is almost pointless to be having this debate.
It does not matter if you start with UNIX or Linux, you are basically starting with the same thing; the rest of the choice is based on personal bias and preferences (right or wrong).
I am going to close this thread since UNIX v. Linux threads are against the rules.
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LEARN ABOUT MOJAVE
gettid
GETTID(2) Linux Programmer's Manual GETTID(2)
NAME
gettid - get thread identification
SYNOPSIS
#include <sys/types.h>
pid_t gettid(void);
Note: There is no glibc wrapper for this system call; see NOTES.
DESCRIPTION
gettid() 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 dis-
cussion 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)).
In a new thread group created by a clone(2) call that does not specify the CLONE_THREAD flag (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 ALSO
capget(2), clone(2), fcntl(2), fork(2), getpid(2), get_robust_list(2), ioprio_set(2), perf_event_open(2), sched_setaffinity(2), sched_set-
param(2), sched_setscheduler(2), tgkill(2), timer_create(2)
COLOPHON
This page is part of release 4.15 of the Linux man-pages project. A description of the project, information about reporting bugs, and the
latest version of this page, can be found at https://www.kernel.org/doc/man-pages/.
Linux 2017-09-15 GETTID(2)