Is it unsafe to call methods from a thread?

Suppose that a UNIX kernel supports threads. would u expect the thread system call to take about the same amou

• suppose that a UNIX kernel supports threads. would u expect the thread system call to take about the same amount of time to execute as fork()?Why and why not?

• Answer:

  Actually, a call to create a thread should (provided it were written properly) take less time to spawn a new thread. The fork() function, however, actually spawns a new process. The difference between processes and threads is that a process is a thread which contains all of the resources that are used by the applications. Therefore, you have a "thread" and you have a "thread plus resources" (process). Because there is extra setup time involved in setting up the resources for the process, the fork() call would take more time in setting up a process than it would a thread.