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04-20-2015, 11:06 AM
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#1
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LQ Newbie
Registered: Jul 2013
Posts: 19
Rep: 
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vfork - suspends the calling process or the calling thread?
Hi,
The man page for vfork sayas : "vfork - create a child process and block parent".
Down below in the description "vfork() differs from fork(2) in that the calling thread is suspended"
In most documentation it says "suspend the process"
So, which is true ? Does the answer depend on Linux version ?
Thanks
zmau
Last edited by zmau; 04-20-2015 at 11:08 AM.
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04-21-2015, 06:45 AM
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#2
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Moderator
Registered: Mar 2011
Location: USA
Distribution: MINT Debian, Angstrom, SUSE, Ubuntu, Debian
Posts: 9,954
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For this case, the words "suspend" and "block" mean the exact same thing. Which is to say that when using vfork() the parent process is suspended, or blocked, awaiting a termination signal from the newly created child process.
Rather than worry about Linux version you can pay attention to the part in the manual page where it describes what the command conforms to:
Quote:
CONFORMING TO4.3BSD, POSIX.1-2001. POSIX.1-2008 removes the specification of vfork()...
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04-21-2015, 02:29 PM
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#3
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LQ Newbie
Registered: Jul 2013
Posts: 19
Original Poster
Rep: 
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Quote:
Originally Posted by rtmistler
For this case, the words "suspend" and "block" mean the exact same thing. Which is to say that when using vfork() the parent process is suspended, or blocked, awaiting a termination signal from the newly created child process.
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Thanks
Maybe I did not present the question correctly.
I was not asking about the words "suspend" VS. "block"
I was asking about "process" VS. "Thread". The question is "Who gets blocked/suspended ? The process OR the thread ?".
zmau
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04-21-2015, 02:38 PM
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#4
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Moderator
Registered: Mar 2011
Location: USA
Distribution: MINT Debian, Angstrom, SUSE, Ubuntu, Debian
Posts: 9,954
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Quote:
Originally Posted by zmau
Thanks
Maybe I did not present the question correctly.
I was not asking about the words "suspend" VS. "block"
I was asking about "process" VS. "Thread". The question is "Who gets blocked/suspended ? The process OR the thread ?".
zmau
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The parent who invoked vfork(), that could be either a thread or a process. And thread is just a "light" process by the way.
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