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Message-ID: <20140220182932.GF18016@ZenIV.linux.org.uk> Date: Thu, 20 Feb 2014 18:29:32 +0000 From: Al Viro <viro@...IV.linux.org.uk> To: "Zuckerman, Boris" <borisz@...com> Cc: Linus Torvalds <torvalds@...ux-foundation.org>, "Michael Kerrisk (man-pages)" <mtk.manpages@...il.com>, lkml <linux-kernel@...r.kernel.org>, Miklos Szeredi <miklos@...redi.hu>, Theodore T'so <tytso@....edu>, Christoph Hellwig <hch@....de>, Chris Mason <clm@...com>, Dave Chinner <david@...morbit.com>, Linux-Fsdevel <linux-fsdevel@...r.kernel.org>, "J. Bruce Fields" <bfields@...i.umich.edu>, Yongzhi Pan <panyongzhi@...il.com> Subject: Re: Update of file offset on write() etc. is non-atomic with I/O On Thu, Feb 20, 2014 at 06:15:15PM +0000, Zuckerman, Boris wrote: > Hi, > > You probably already considered that - sorry, if so… > > Instead of the mutex Windows use ExecutiveResource with shared and exclusive semantics. Readers serialize by taking the resource shared and writers take it exclusive. I have that implemented for Linux. Please, let me know if there is any interest! See include/linux/rwsem.h... Anyway, the really interesting question here is what does POSIX promise wrt lseek() vs. write(). What warranties are given there? -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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