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my opinion regarding the first qstn:
- ritesh ghosh May 17, 2013fork() - it does call clone() inside it but with the flag as SIGCHLD i.e. clone(SIGCHLD, 0). So, none of the resources are shared. But, copied to child on COW basis.
pthread() - is a POSIX wrapper for clone() system call to create a thread, in this case clone is called like clone( CLONE_VM | CLONE_FS | CLONE_FILE | CLONE_SIGHNDL). So, address space, open files, file system handlers, signal handlers are shared.
vfork() - is also calling clone() similar to fork(), only difference is process address space is not copied to child and execution of parent is suspended till the execution of child. They used it before COW was introduced.
Interesting thing is all of them are calling clone() because linux kernel actually does not differentiate between process and thread except the flags - all are tasks.