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From: | Barry deFreese |
Subject: | Re: Patch to retrieve send rights for shared memory objects |
Date: | Sat, 26 Feb 2005 19:53:19 -0800 |
User-agent: | Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.5) Gecko/20050105 Debian/1.7.5-1 |
Roland McGrath wrote:
Ok. Should we change diskfs_get_filemap to accept a flag that says we do not want to create the memory object if it doesn't exist already? That seems to be#define S_IMAPPED 000100000000 /* Might be mmap'd. */ #define S_IMAPPEDM 000200000000 /* Might be mmap'd more than once. */Actually, for compatibility purposes it's better to reverse the sense of those bits. i.e. #define S_IMMAP0 000100000000 /* Definitely no mmap's to this. */ #define S_IMMAP1 000100000000 /* Probably only one mmap to this. */
an important optimization to me if we call it in io_stat. Marcus -- Barry deFreese Debian 3.0r1 "Woody" GNU/Hurd Registered Linux "Newbie" #302256 - Hurd H4XX0r wannabe "Programming today is a race between software engineers striving to build bigger and better idiot-proof programs, and the Universe trying to produce bigger and better idiots. So far, the Universe is winning." Rich Cook.
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