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Restore some code removed in revision 1.193 and 1.194, julian said

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he'd like to keep these code.
This commit is contained in:
David Xu 2004-10-06 00:49:41 +00:00
parent 906ac69d08
commit e0cfeb44a8
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=136178
1 changed files with 23 additions and 4 deletions
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27
sys/kern/kern_kse.c
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@ -1157,11 +1157,22 @@ thread_switchout(struct thread *td, int flags, struct thread *nextthread)
void
thread_user_enter(struct thread *td)
{
struct proc *p = td->td_proc;
struct ksegrp *kg;
struct kse_upcall *ku;
struct kse_thr_mailbox *tmbx;
uint32_t flags;
/*
* First check that we shouldn't just abort. we
* can suspend it here or just exit.
*/
if (__predict_false(P_SHOULDSTOP(p))) {
PROC_LOCK(p);
thread_suspend_check(0);
PROC_UNLOCK(p);
}
if (!(td->td_pflags & TDP_SA))
return;
@ -1198,7 +1209,7 @@ thread_user_enter(struct thread *td)
} else {
td->td_mailbox = tmbx;
td->td_pflags |= TDP_CAN_UNBIND;
if (__predict_false(td->td_proc->p_flag & P_TRACED)) {
if (__predict_false(p->p_flag & P_TRACED)) {
flags = fuword32(&tmbx->tm_dflags);
if (flags & TMDF_SUSPEND) {
mtx_lock_spin(&sched_lock);
@ -1379,9 +1390,17 @@ thread_userret(struct thread *td, struct trapframe *frame)
* the process.
* how do we do that?
*/
PROC_LOCK(td->td_proc);
psignal(td->td_proc, SIGSEGV);
PROC_UNLOCK(td->td_proc);
PROC_LOCK(p);
psignal(p, SIGSEGV);
PROC_UNLOCK(p);
} else {
/*
* Optimisation:
* Ensure that we have a spare thread available,
* for when we re-enter the kernel.
*/
if (td->td_standin == NULL)
thread_alloc_spare(td);
}
ku->ku_mflags = 0;