Function gettid 

pub fn gettid() -> Pid

gettid()—Returns the thread ID.

This returns the OS thread ID, which is not necessarily the same as the Rust’s std::thread::Thread::id or the pthread ID.

This function always does a system call. To avoid this overhead, ask the thread runtime for the ID instead, for example using libc::gettid or origin::thread::current_id.

References

• Linux