Phong, how do I use aso to get an exclusive lock/mutex, and release
it? Can a aso lock/mutex be nested?
Olga
On Thu, Aug 16, 2012 at 4:16 PM, Glenn Fowler <g...@research.att.com> wrote:
>
> any locking/critical regions will have to use aso
> because libast itself does not require -l*thread*
>
> On Thu, 16 Aug 2012 16:11:16 +0200 =?KOI8-R?B?z8zYx8Egy9LZ1sHOz9fTy8HR?=
> wrote:
>> Glenn, is the general plan of putting a openat() emulation into libast
>> acceptable for you? I found that Roland wrote one in 2004 with threads
>> in mind, and that it only needs polishing and testing. If you agree to
>> take it I can spend some time this evening on it.
>
>> Olga
>
>> On Thu, Aug 16, 2012 at 1:20 AM, Glenn Fowler <g...@research.att.com> wrote:
>> >
>> > On Thu, 16 Aug 2012 01:09:29 +0200 =?KOI8-R?B?z8zYx8Egy9LZ1sHOz9fTy8HR?=
>> > wrote:
>> >> Glenn, have you ever considered putting an openat(), fstatat(),
>> >> mkfifoat() emulation into libast, if the base operating system does
>> >> not have such calls? I have been trying more tests with the at() apis
>> >> but I am not happy to trash much of libshell with lots of #ifdef
>> >> AT_CWD tests if there is a better option.
>> >
>> >> AFAIK a lot of the at() calls can be emulated by using
>> >> /dev/fd/${dirfd}/${path} or /proc/${pid}/fd/${dirfd}/${path}. I just
>> >> do not know, are there cases where /dev/fd or /proc/${pid}/fd are not
>> >> available (chroot environments?)?
>> >
>> > there are a lot of systems with lame or no /proc
>> > and it will be hard to work around systems with no O_search
>> >
>> > but let me think a bit on that
>> > if we didn't have to worry about dir fd's across exec (probably rare right
>> > now)
>> > we might be able to cache emulated open(O_search) paths with <dev,ino> keys
>> > on systems that don't support /dev/fd/<FD>/<PATH> pr
>> > /proc/<PID>/fd/<FD>/<PATH>
>> >> Olga
>> >> --
>> >> , _ _ ,
>> >> { \/`o;====- Olga Kryzhanovska -====;o`\/ }
>> >> .----'-/`-/ olga.kryzhanov...@gmail.com \-`\-'----.
>> >> `'-..-| / http://twitter.com/fleyta \ |-..-'`
>> >> /\/\ Solaris/BSD//C/C++ programmer /\/\
>> >> `--` `--`
>> >
>
>> --
>> , _ _ ,
>> { \/`o;====- Olga Kryzhanovska -====;o`\/ }
>> .----'-/`-/ olga.kryzhanov...@gmail.com \-`\-'----.
>> `'-..-| / http://twitter.com/fleyta \ |-..-'`
>> /\/\ Solaris/BSD//C/C++ programmer /\/\
>> `--` `--`
>
--
, _ _ ,
{ \/`o;====- Olga Kryzhanovska -====;o`\/ }
.----'-/`-/ olga.kryzhanov...@gmail.com \-`\-'----.
`'-..-| / http://twitter.com/fleyta \ |-..-'`
/\/\ Solaris/BSD//C/C++ programmer /\/\
`--` `--`
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