Date: Thu, 24 Jun 2010 12:43:28 +0400 From: pluknet <pluknet@gmail.com> To: Gabor Kovesdan <gabor@freebsd.org> Cc: soc-status@freebsd.org Subject: Re: Collective resource limits status report #3 Message-ID: <AANLkTinJcthrFcG4Vt8FK6NQ_UoDlCjeTNfYnCfoA0EU@mail.gmail.com> In-Reply-To: <4C230A0B.3080700@FreeBSD.org> References: <4C1BCB96.4040608@FreeBSD.org> <AANLkTikwUYWCIvlDQ60L4L8gMcEeDFIV6850csEwuH8E@mail.gmail.com> <4C21CAF0.2040607@FreeBSD.org> <AANLkTikLoskpABjaUlufnBGOBeU-Z62CiuQfH5sDyY1Z@mail.gmail.com> <4C230A0B.3080700@FreeBSD.org>
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On 24 June 2010 11:32, Gabor Kovesdan <gabor@freebsd.org> wrote: > El 2010. 06. 23. 14:44, pluknet escribi=F3: >> >> On 23 June 2010 12:50, Gabor Kovesdan<gabor@freebsd.org> =A0wrote: >> >>>> >>>> +typedef __uint32_t =A0 =A0 __jid_t; >>>> >>>> >>> >>> This has to be signed because calls may return -1. >>> >> >> It might return jid_t (-1) then as it's done similarly for getpid(2) >> family >> which return pid_t(-1) on error, or similarly for inet_addr(3) which >> returns >> INADDR_NONE (0xffffffff, or -1 for uint32_t, let it be signed) on error. >> > > In the meantime, I've found this: > http://techpubs.sgi.com/library/tpl/cgi-bin/getdoc.cgi?coll=3D0650&db=3Db= ks&fname=3D/SGI_Admin/IA_Resource/apa.html > Now, I changed it back because some applications may expect it to be a > 64-bit variable then, and we are not sure about its relation to uid_t yet= , > so we may provide higher capacity. Hey, it's even more interesting than I could imagine. uid_t, pid_t here are signed types as well, int32_t or long, depending on machine type. That probably explains why jid_t has also a signed type (e.g. might inherit= it). Upper bits in jid_t are reserved for machine ID (has signed int type), used also in IRIX array sessions. That's why jid_t has to be 64-bit capable= . --=20 wbr, pluknet
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