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    <ol> <li><p>Depends. If a thread is preempted because the OS scheduler decides to give CPU time to some other thread, then other threads in the process will continue running. If the process is suspended (i.e. it gets the SIGSTP signal) then AFAIK all the threads will be suspended.</p></li> <li><p>When a suspended process is woken up, all the threads are marked as waiting or blocked (if they are waiting e.g. on a mutex). Then the scheduler at some points run them. There is no guarantee about any specific order the threads are run after waking up the process.</p></li> <li><p>The process will terminate, and with it the threads as well.</p></li> <li><p>When you fork you get a new address space, so there is no "overlay". Note that fork() and the exec() family affect the entire process, not only the thread from which they where called. When you call fork() in a multi-threaded process, the child gets a copy of that process, but with only the calling thread. Then if you call exec() in one or both of the processes (presumably only in the child process, but that's up to you), then the process which calls exec() (and with it, all its threads) is replaced by the exec()'ed program.</p></li> <li><p>The thread scheduling order is decided by the OS scheduler, there is no guarantee given about any particular order. </p></li> <li><p>From the kernel perspective a process is an address space with one or more threads (and some other gunk). There is no concept of threads that somehow exist without a process.</p></li> <li><p>There is no such thing as a process without a single thread. A "plain process" is just a process with a single thread.</p></li> <li><p>Probably yes. This is determined by the OS scheduler. Note that there are API's and tools (numactl) that one can use to force some thread(s) to run on a specific CPU core.</p></li> </ol>
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    1. POThreads: some questions
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    1. CO4. On process exec'ing another process, current process address space is overwritten by the exec'd process.
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    2. CO4. What happens when either process or its threads exec's? Does only parent process address space will get overwritten by the exec'd what happens to the threads?
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    3. COProcess having multiple threads preempted due to sleep or its time quantum expires. Before preemption thread is running. When the process resumes execution does it continue with the thread or the process. How and where it remembers the threads context(PC value/context) so that thread will continue from where it is left before preemption? During context switch only process context is stored not the threads context(user context, hardware register etc). When the thread resumes execution from where its context is restored?
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