Date: Wed, 29 May 2002 10:36:47 +0800 From: "kai ouyang" <oykai@msn.com> To: "Julian Elischer" <julian@elischer.org>, <current@FreeBSD.org>, <oyk@wtwh.com.cn> Subject: Re:why change: from proc to thread? Message-ID: <OE160GIpGPnLajJwb1S00006520@hotmail.com>
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[-- Attachment #1 --] Thank you! I know a little more. From the kthread_create() function, I find Both 4.x and 5.0 are implemented by fork1(). I am puzzled about the structure thread and the structure proc only are different terms. How or what part source code can I find the difference thread realization between 4.x and 5.0? On Mon, 27 May 2002, kai ouyang wrote: > Hi,everybody > I found many v_operations, such as VOP_UNLOCK, VOP_OPEN....., there > all have a parameter(struct proc) in FreeBSD4.x, but, there all be > changed to thread in FreeBSD5.0. why? And what relation of the proc > and thread ? > Thank you! > FreeBSD is plannig on supporting threads at a kernel level. To do this, the basic scheduling element becomes the thread instead of the process. For this reason, for example, locks must be held by threads instead of processes, and contexts are owned by threads instead of processes. This means that most functions will need a thread pointer instead of a process pointer. The "process" becomes basically an accounting abstraction and the holder of resources, where most of the kernel is more interested in the thread. Each process has at least one thread, possibly many. Each thread is associated with exactly one process. julian从网站得到更多信息。MSN Explorer 免费下载:http://explorer.msn.com/lccn [-- Attachment #2 --] <HTML><BODY STYLE="font:10pt verdana; border:none;"><DIV> </DIV> <DIV>Thank you! I know a little more.</DIV> <DIV>From the kthread_create() function, I find Both 4.x and 5.0 are implemented by fork1().</DIV> <DIV>I am puzzled about the structure thread and the structure proc only are different terms.</DIV> <DIV>How or what part source code can I find the difference thread realization between 4.x and 5.0?</DIV> <BLOCKQUOTE style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px"> <DIV><BR>On Mon, 27 May 2002, kai ouyang wrote:<BR><BR>> Hi,everybody<BR>> I found many v_operations, such as VOP_UNLOCK, VOP_OPEN....., there<BR>> all have a parameter(struct proc) in FreeBSD4.x, but, there all be<BR>> changed to thread in FreeBSD5.0. why? And what relation of the proc<BR>> and thread ?<BR>> Thank you!<BR>><BR><BR>FreeBSD is plannig on supporting threads at a kernel level.<BR>To do this, the basic scheduling element becomes the thread instead of the<BR>process. For this reason, for example, locks must be held by threads<BR>instead of processes, and contexts are owned by threads instead of<BR>processes. This means that most functions will need a thread pointer<BR>instead of a process pointer. The "process" becomes basically an<BR>accounting abstraction and the holder of resources, where most of the<BR>kernel is more interested in the thread.<BR><BR>Each process has at least one thread, possibly many. Each thread is<BR>associated with exactly one process.<BR><BR><BR><BR>julian<BR><BR><BR></DIV></BLOCKQUOTE></BODY></HTML><br clear=all><hr>从网站得到更多信息。MSN Explorer 免费下载：<a href='http://explorer.msn.com/lccn'>http://explorer.msn.com/lccn</a><br></p>;help
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