Hi,<br> Once process terminated for what ever reason, kernel should release all the resources held by that process including lock.<br>do_exit()-->exit_sem().<br><br>thanks,<br>Rajath<br><div class="gmail_quote">On Tue, Feb 28, 2012 at 1:53 PM, Rajath N R <span dir="ltr"><<a href="mailto:rajathnr@gmail.com">rajathnr@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hi,<br> I think santosh is talking about user land IPC (semget). thread/process which has acquired a sema lock/sem down using semop(2) syscall. <br>
<br><br><br>Thanks,<br>Rajath<div class="HOEnZb"><div class="h5"><br><br><div class="gmail_quote">On Fri, Feb 24, 2012 at 3:54 PM, Kristof Provost <span dir="ltr"><<a href="mailto:kristof@sigsegv.be" target="_blank">kristof@sigsegv.be</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div>On 2012-02-24 12:15:03 (+0200), Kosta Zertsekel <<a href="mailto:zertsekel@gmail.com" target="_blank">zertsekel@gmail.com</a>> wrote:<br>
> I think of user land program opening a socket and crashing on<br>
> segmentation fault.<br>
> In code 'socket' syscall does:<br>
> sock_map_fd --> sock_alloc_file --> alloc_file --> ... get lost ...<br>
> Where exactly in this case lock is held - I mean the lock that gets<br>
> released when user land process dies?<br>
<br>
</div>In this case there doesn't appear to be any lock. The sock_map_fd<br>
function is most probably called from the socket syscall. This call<br>
isn't locked. Multiple processes can be in the socket syscall at the<br>
same time.<br>
There certainly won't be a (kernel) lock which is held between two system<br>
calls.<br>
<br>
Regards,<br>
Kristof<br>
<div><div><br>
<br>
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</div></div></blockquote></div><br><br clear="all"><br></div></div><span class="HOEnZb"><font color="#888888">-- <br>Thanks & Regards,<br>Rajath N R<br>
</font></span></blockquote></div><br><br clear="all"><br>-- <br>Thanks & Regards,<br>Rajath N R<br>