Do all threads have same PID?

No. Thread and process have the same PID. Whenever a process spawns a thread or multiple threads, all of them (including process) have the same PID. The difference will be in their TGID (Thread group ID).

Can processes have the same PID?

Just a quick question, if I clone a process, the PID of the cloned process is the same, yes? fork() creates a child process where the PID differs, but everything else is the same. Vfork() creates a child process with the same PID. Exec works to change a process currently in execution to something else.

How do I find the PID of a thread in Linux?

but how can i get the pid of a thread? getpid() just return the pid of the main thread….

1. Linux 2.6 replaced LinuxThreads with NPTL, Linux now follows POSIX and correctly returns the same PID for each thread.
2. You should consider “accept”ing answers that you find useful.

Can a process change its own PID?

Each new process (and each new instance of the same named program) has a new Process IDentifier. The PID is an integer, and when it gets to its maximum value it wraps around back to 1. The PID value (number) is unique for any moment in time.

Is the PID of a process always the same?

Except for the idle and so-called “system” processes; those PIDs are always the same within a version of Windows.

What is the PID of init process in Linux?

Process ID 1 is usually the init process primarily responsible for starting and shutting down the system. More recent Unix systems typically have additional kernel components visible as ‘processes’, in which case PID 1 is actively reserved for the init process to maintain consistency with older systems.

How are threads created in Linux?

To the Linux kernel, there is no concept of a thread. Linux implements all threads as standard processes. The Linux kernel does not provide any special scheduling semantics or data structures to represent threads. Instead, a thread is merely a process that shares certain resources with other processes.

Does thread have PID?

In the kernel, each thread has its own ID, called a PID, although it would possibly make more sense to call this a TID, or thread ID, and they also have a TGID (thread group ID) which is the PID of the first thread that was created when the process was created.

What is the difference between thread and process in Linux?

A process is a program under execution i.e an active program. A thread is a lightweight process that can be managed independently by a scheduler. Processes require more time for context switching as they are more heavy. Threads require less time for context switching as they are lighter than processes.