Messages in this thread | | | From | Christian Widmer <> | Subject | Re: does the request function block | Date | Tue, 28 Aug 2001 21:15:59 +0200 |
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On Tuesday 28 August 2001 20:28, you wrote: > No they don't. NBD moves the requests to an internal queue when the > request function is run. The function does not block. The internal > queue is later emptied by another means, in another context.
ok - does result = sock_sendmsg(sock, &msg, size); block? something in the back of my brains sais yes, but i might be wrong since i'm new to linux kernel programing. if it does block nbd blocks. it realeases the io_request_lock lock and calls nbd_send_req which calls nbd_xmit and that results in a call to sock_sendmst.
in the documention ob the brbd it sais: that the request function is allways called in the context of a process doing I/O the kflushd or the kupdate kernel thread.
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