sbrk(2) broken
Poul-Henning Kamp
phk at phk.freebsd.dk
Mon Jan 7 01:08:39 PST 2008
In message <20080104134829.GA57756 at deviant.kiev.zoral.com.ua>, Kostik Belousov
writes:
>On Fri, Jan 04, 2008 at 02:12:50PM +0100, Dag-Erling Sm??rgrav wrote:
>> "Igor Mozolevsky" <igor at hybrid-lab.co.uk> writes:
>> > This makes memory management in the userland hideously and
>> > unnecessarily complicated. It's simpler to have SIGDANGER [...]
>>
>> You don't seem to understand what Poul-Henning was trying to point out,
>> which is that broadcasting SIGDANGER can make a bad situation much, much
>> worse by waking up and paging in every single process in the system,
>
>By making the default action for SIGDANGER to be SIG_IGN, this problem
>would be mostly solved. Only processes that actually care about SIGDANGER
>and installing the handler for it would require some non-trivial and
>resource-hungry operation.
This is a non-starter, if SIGDANGER is to have any effect, all
processes that use malloc(3) should react to it.
--
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
phk at FreeBSD.ORG | TCP/IP since RFC 956
FreeBSD committer | BSD since 4.3-tahoe
Never attribute to malice what can adequately be explained by incompetence.
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