Xref: utzoo comp.unix.xenix:4040 comp.unix.wizards:13025 Path: utzoo!utgpu!watmath!clyde!att!osu-cis!tut.cis.ohio-state.edu!cwjcc!hal!nic.MR.NET!uwmcsd1!marque!uunet!mcvax!enea!kth!draken!chalmers!myab!lars From: lars@myab.se (Lars Pensj|) Newsgroups: comp.unix.xenix,comp.unix.wizards Subject: Re: wakeup() race condition. (theory) Keywords: wakeup sleep spl Message-ID: <447@myab.se> Date: 29 Nov 88 14:46:40 GMT References: <455@mrecvax.UUCP> <1974@van-bc.UUCP> Reply-To: lars@myab.se (Lars Pensj|) Organization: Myab Gothenburg, Sweden Lines: 22 In article <1974@van-bc.UUCP> sl@van-bc.UUCP (pri=-10 Stuart Lynne) writes: > x = spl(5); > state |= IAmAsleep; > sleep(...) > splx(x); Just a note about this. It should be x = spl(5); state |= IAmAsleep; ! while (state & IAmAsleep) ! sleep(...); splx(x); because sleep() may wake through other wakeup() with unknown codes. -------------- Lars Pensj| lars@myab.se -- Lars Pensj| lars@myab.se