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lock proc while calling psignal

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(plus related cleanups)

Submitted by:	davidxu
This commit is contained in:
Julian Elischer 2002-09-29 02:48:37 +00:00
parent 40eecdba73
commit 0cd3964f6d
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=104126
2 changed files with 34 additions and 18 deletions
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26
sys/kern/kern_kse.c
View File

@ -326,6 +326,7 @@ thread_free(struct thread *td)
int
thread_export_context(struct thread *td)
{
struct proc *p = td->td_proc;
struct ksegrp *kg;
uintptr_t mbx;
void *addr;
@ -346,7 +347,9 @@ thread_export_context(struct thread *td)
}
if (error) {
psignal(td->td_proc, SIGSEGV);
PROC_LOCK(p);
psignal(p, SIGSEGV);
PROC_UNLOCK(p);
return (error);
}
/* get address in latest mbox of list pointer */
@ -364,16 +367,18 @@ thread_export_context(struct thread *td)
for (;;) {
mbx = (uintptr_t)kg->kg_completed;
if (suword(addr, mbx)) {
psignal(kg->kg_proc, SIGSEGV);
PROC_LOCK(p);
psignal(p, SIGSEGV);
PROC_UNLOCK(p);
return (EFAULT);
}
PROC_LOCK(kg->kg_proc);
PROC_LOCK(p);
if (mbx == (uintptr_t)kg->kg_completed) {
kg->kg_completed = td->td_mailbox;
PROC_UNLOCK(kg->kg_proc);
PROC_UNLOCK(p);
break;
}
PROC_UNLOCK(kg->kg_proc);
PROC_UNLOCK(p);
}
return (0);
}
@ -385,6 +390,7 @@ thread_export_context(struct thread *td)
static int
thread_link_mboxes(struct ksegrp *kg, struct kse *ke)
{
struct proc *p = kg->kg_proc;
void *addr;
uintptr_t mbx;
@ -397,17 +403,19 @@ thread_link_mboxes(struct ksegrp *kg, struct kse *ke)
for (;;) {
mbx = (uintptr_t)kg->kg_completed;
if (suword(addr, mbx)) {
psignal(kg->kg_proc, SIGSEGV);
PROC_LOCK(p);
psignal(p, SIGSEGV);
PROC_UNLOCK(p);
return (EFAULT);
}
/* XXXKSE could use atomic CMPXCH here */
PROC_LOCK(kg->kg_proc);
PROC_LOCK(p);
if (mbx == (uintptr_t)kg->kg_completed) {
kg->kg_completed = NULL;
PROC_UNLOCK(kg->kg_proc);
PROC_UNLOCK(p);
break;
}
PROC_UNLOCK(kg->kg_proc);
PROC_UNLOCK(p);
}
return (0);
}

26
sys/kern/kern_thread.c
View File

@ -326,6 +326,7 @@ thread_free(struct thread *td)
int
thread_export_context(struct thread *td)
{
struct proc *p = td->td_proc;
struct ksegrp *kg;
uintptr_t mbx;
void *addr;
@ -346,7 +347,9 @@ thread_export_context(struct thread *td)
}
if (error) {
psignal(td->td_proc, SIGSEGV);
PROC_LOCK(p);
psignal(p, SIGSEGV);
PROC_UNLOCK(p);
return (error);
}
/* get address in latest mbox of list pointer */
@ -364,16 +367,18 @@ thread_export_context(struct thread *td)
for (;;) {
mbx = (uintptr_t)kg->kg_completed;
if (suword(addr, mbx)) {
psignal(kg->kg_proc, SIGSEGV);
PROC_LOCK(p);
psignal(p, SIGSEGV);
PROC_UNLOCK(p);
return (EFAULT);
}
PROC_LOCK(kg->kg_proc);
PROC_LOCK(p);
if (mbx == (uintptr_t)kg->kg_completed) {
kg->kg_completed = td->td_mailbox;
PROC_UNLOCK(kg->kg_proc);
PROC_UNLOCK(p);
break;
}
PROC_UNLOCK(kg->kg_proc);
PROC_UNLOCK(p);
}
return (0);
}
@ -385,6 +390,7 @@ thread_export_context(struct thread *td)
static int
thread_link_mboxes(struct ksegrp *kg, struct kse *ke)
{
struct proc *p = kg->kg_proc;
void *addr;
uintptr_t mbx;
@ -397,17 +403,19 @@ thread_link_mboxes(struct ksegrp *kg, struct kse *ke)
for (;;) {
mbx = (uintptr_t)kg->kg_completed;
if (suword(addr, mbx)) {
psignal(kg->kg_proc, SIGSEGV);
PROC_LOCK(p);
psignal(p, SIGSEGV);
PROC_UNLOCK(p);
return (EFAULT);
}
/* XXXKSE could use atomic CMPXCH here */
PROC_LOCK(kg->kg_proc);
PROC_LOCK(p);
if (mbx == (uintptr_t)kg->kg_completed) {
kg->kg_completed = NULL;
PROC_UNLOCK(kg->kg_proc);
PROC_UNLOCK(p);
break;
}
PROC_UNLOCK(kg->kg_proc);
PROC_UNLOCK(p);
}
return (0);
}