Date: Fri, 06 Oct 2000 12:22:19 -0700 From: Wilbert de Graaf <wilbertdg@hetnet.nl> To: freebsd-net@freebsd.org Subject: how to lock, but not using spl Message-ID: <39DE266B.E9975E2F@hetnet.nl>
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I have been working on some FreeBSD networking code, that used spl() to
protect a linked list. I want to change this using ? so that it would
run on SMP systems too. I monitored the SMP list and had a look in the
4.4BSD book but I haven't been able to find how to do it on BSD. Is
there any sample or can anybopdy give me a pointer ?
- Wilbert
Some more info about what I would like to do:
SLIST_HEAD slh;
// gets called from the ioctl (the api)
void my_ioctl(int n)
{
struct my_entry e = malloc(sizeof(struct my_entry), ...);
e->id = n;
// s = splnet();
... ? ...
SLIST_INSERT_HEAD(slh, e, e->link);
// splx(s);
... ? ...
}
// gets called from a timer
void my_timer(void)
{
struct my_entry e;
FOREACH(e, slh) {
if (e->done) {
// s = splnet();
... ? ...
SLIST_REMOVE(slh, e, struct my_entry, e->link);
// splx(s);
... ? ...
}
}
}
I have the impression simple_lock() can do this but I'm not sure if any
of these processes can block on the other. Like what if the net timer
mechanism has to block on a smiple api call.
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