From: Grigory Batalov <bga@altlinux.ru> To: devel@altlinux.ru Subject: [devel] Fw: Re: [sisyphus] Shared memory Date: Thu, 25 Mar 2004 11:10:59 +0300 Message-ID: <20040325111059.0162db1e.bga@altlinux.ru> (raw) Date: Thu, 25 Mar 2004 02:59:41 -0500 From: Ivan Adzhubey <iadzhubey@rics.bwh.harvard.edu> To: ALT Linux Sisyphus discussion list <sisyphus@altlinux.ru> Subject: Re: [sisyphus] Shared memory - HELP PLEASE! <skip> Так, слегка запутался: man shmget: int shmget(key_t key, int size, int shmflg); ...shmget() returns the identifier of the shared memory segment associated with the value of the argument key. A new shared memory segment, with size equal to the value of size rounded up to a multiple of PAGE_SIZE, ... PAGE_SIZE у нас вроде бы 0x400 == 1024 bytes shm.h: #define SHMMIN 1 /* min shared seg size (bytes) */ но shmget работает как-то странно: shmtest.c: shmid = shmget(IPC_PRIVATE, 1, IPC_CREAT|0700); ipcs: ------ Shared Memory Segments -------- key shmid owner perms bytes nattch status 0x00000000 1966087 ivan 700 0 1 <size=2...1022> аналогично shmtest.c: shmid = shmget(IPC_PRIVATE, 1023, IPC_CREAT|0700); ipcs: ------ Shared Memory Segments -------- key shmid owner perms bytes nattch status 0x00000000 1966087 ivan 700 0 1 то есть никакой памяти не выделяется, хотя и ошибки тоже не генерируется. shmtest.c: shmid = shmget(IPC_PRIVATE, 1024, IPC_CREAT|0700); ipcs: ------ Shared Memory Segments -------- key shmid owner perms bytes nattch status 0x00000000 1966087 ivan 700 4096 1 Опа, сразу 4 страницы! shmtest.c: shmid = shmget(IPC_PRIVATE, 2*1024, IPC_CREAT|0700); ipcs: ------ Shared Memory Segments -------- key shmid owner perms bytes nattch status 0x00000000 1966087 ivan 700 8192 1 И так далее, в два раза больше чем запрошено. Грустно, но курение манов совершенно не помогает. Не перекинет ли кто из подписантов этот тред в devel@? Может гуру курят что-то более подходящее к случаю и смогут помочь мне узреть истину? -- Иван _______________________________________________ Sisyphus mailing list Sisyphus@altlinux.ru http://lists.altlinux.ru/mailman/listinfo/sisyphus
next reply other threads:[~2004-03-25 8:10 UTC|newest] Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top 2004-03-25 8:10 Grigory Batalov [this message] 2004-03-25 8:25 ` Denis Ovsienko 2004-03-25 8:43 ` Grigory Batalov 2004-03-25 8:44 ` Grigory Batalov
Reply instructions: You may reply publicly to this message via plain-text email using any one of the following methods: * Save the following mbox file, import it into your mail client, and reply-to-all from there: mbox Avoid top-posting and favor interleaved quoting: https://en.wikipedia.org/wiki/Posting_style#Interleaved_style * Reply using the --to, --cc, and --in-reply-to switches of git-send-email(1): git send-email \ --in-reply-to=20040325111059.0162db1e.bga@altlinux.ru \ --to=bga@altlinux.ru \ --cc=devel@altlinux.ru \ /path/to/YOUR_REPLY https://kernel.org/pub/software/scm/git/docs/git-send-email.html * If your mail client supports setting the In-Reply-To header via mailto: links, try the mailto: link
ALT Linux Team development discussions This inbox may be cloned and mirrored by anyone: git clone --mirror http://lore.altlinux.org/devel/0 devel/git/0.git # If you have public-inbox 1.1+ installed, you may # initialize and index your mirror using the following commands: public-inbox-init -V2 devel devel/ http://lore.altlinux.org/devel \ devel@altlinux.org devel@altlinux.ru devel@lists.altlinux.org devel@lists.altlinux.ru devel@linux.iplabs.ru mandrake-russian@linuxteam.iplabs.ru sisyphus@linuxteam.iplabs.ru public-inbox-index devel Example config snippet for mirrors. Newsgroup available over NNTP: nntp://lore.altlinux.org/org.altlinux.lists.devel AGPL code for this site: git clone https://public-inbox.org/public-inbox.git