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Re: processes, tasks, threads

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Re: processes, tasks, threads

Subject: Re: processes, tasks, threads
From: Terry Lambert <email@hidden>
Date: Tue, 13 Apr 2010 05:13:32 -0700

On Apr 10, 2010, at 6:06 AM, Ariel Feinerman wrote:

Hi, sorry for stupid question. What is the difference between process, task, flow and thread in the Darwin? What kind of relationsheeps between calls fork(), exec() and pthreads or mach threads? I heard that in some OS process and thread are the same entity at least in Linux. Thank you in advance,

<http://opensource.apple.com/source/xnu/xnu-1504.3.12/bsd/kern/kern_fork.c >

The block comment before the vfork() function will be informative. Specifically, the "Before" picture.

The "After" picture shows the child "borrowing" the parent process's thread, uthread, and task (which it keeps borrowed until after you call execve() or _exit(), which are the only legal calls to make after a vfork(); everything else is "implementation defined", according to the POSIX specification).

You could also buy/borrow Amit Singh's book.

-- Terry
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  >processes, tasks, threads (From: Ariel Feinerman <email@hidden>)




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