Date: Thu, 31 Mar 2005 09:24:51 +0800 From: "dragonfly dragonfly" <dragonylffly@hotmail.com> To: freebsd-arch@freebsd.org Subject: FreeBSD module inference count problem Message-ID: <BAY19-F23ED19BA60458B19900181DE470@phx.gbl>
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Hi all,
Recently I am doing some programming on FreeBSD KLD.
In my KLD codes,I will start some kernel threads to serve requests,but i
can not find how to increase the module reference count,something like
'MOD_INC_USE_COUNT' in Linux.If not do so,if the user
downloaded the module before all kernel threads exit,
the system must be panic.I searched the file 'module.h'
carefully,only find module_reference().But it seemed in
total kernel source,the function does not be used.Even
use it,when i use kldstat to see its reference count,it keep __1__!
When i download the module before the kernel thread wake up,
system panic as expect.
my KLD codes like below:
module_t curmod;
void do_job(void *arg)
{
if (!curmod)
printf("Module not found\n");
else
module_reference(curmod);
tsleep(curproc,PRIBIO,"foo worker",15*hz);
printf("Wake up\n");
if (curmod)
module_release(curmod);
kthread_exit(0);
}
static int foo_loader(struct module *m, int what, void *arg)
{
int err = 0;
struct proc *newpp;
switch (what) {
case MOD_LOAD:
curmod=m;
kthread_create(do_job,NULL,&newpp,0,0,"foo worker");
printf("foo loaded\n");
break;
case MOD_UNLOAD:
case MOD_SHUTDOWN:
printf("foo unloaded.\n");
break;
default:
err = EOPNOTSUPP;
break;
}
return(err);
}
Could you help me?
Thanks.
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