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- Add nsems_total and track the use of all semaphores (not only named ones). 

Prevents ksem module from unloading while anonymous semaphore(s) are in use.
- ksem_free: add few asserts.
This commit is contained in:
rmind 2011-04-16 20:39:18 +00:00
parent 847614d665
commit d8dc3301a0
1 changed files with 18 additions and 5 deletions
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23
sys/kern/uipc_sem.c
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@ -1,4 +1,4 @@
/* $NetBSD: uipc_sem.c,v 1.33 2011/04/15 00:01:48 rmind Exp $ */
/* $NetBSD: uipc_sem.c,v 1.34 2011/04/16 20:39:18 rmind Exp $ */
/*-
* Copyright (c) 2011 The NetBSD Foundation, Inc.
@ -60,11 +60,12 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: uipc_sem.c,v 1.33 2011/04/15 00:01:48 rmind Exp $");
__KERNEL_RCSID(0, "$NetBSD: uipc_sem.c,v 1.34 2011/04/16 20:39:18 rmind Exp $");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/atomic.h>
#include <sys/proc.h>
#include <sys/ksem.h>
#include <sys/syscall.h>
@ -104,6 +105,7 @@ typedef struct ksem {
static kmutex_t ksem_lock __cacheline_aligned;
static LIST_HEAD(,ksem) ksem_head __cacheline_aligned;
static u_int nsems_total __cacheline_aligned;
static u_int nsems __cacheline_aligned;
static int ksem_sysinit(void);
@ -141,9 +143,10 @@ ksem_sysinit(void)
{
int error;
nsems = 0;
mutex_init(&ksem_lock, MUTEX_DEFAULT, IPL_NONE);
LIST_INIT(&ksem_head);
nsems_total = 0;
nsems = 0;
error = syscall_establish(NULL, ksem_syscalls);
if (error) {
@ -162,7 +165,11 @@ ksem_sysfini(bool interface)
if (error != 0) {
return error;
}
if (nsems != 0) {
/*
* Make sure that no semaphores are in use. Note: semops
* must be unused at this point.
*/
if (nsems_total) {
error = syscall_establish(NULL, ksem_syscalls);
KASSERT(error == 0);
return EBUSY;
@ -296,6 +303,7 @@ ksem_create(lwp_t *l, const char *name, ksem_t **ksret, mode_t mode, u_int val)
ks->ks_uid = kauth_cred_geteuid(uc);
ks->ks_gid = kauth_cred_getegid(uc);
atomic_inc_uint(&nsems_total);
*ksret = ks;
return 0;
}
@ -304,6 +312,9 @@ static void
ksem_free(ksem_t *ks)
{
KASSERT(ks->ks_ref == 0);
KASSERT(!cv_has_waiters(&ks->ks_cv));
if (ks->ks_name) {
KASSERT(ks->ks_namelen > 0);
kmem_free(ks->ks_name, ks->ks_namelen);
@ -311,6 +322,8 @@ ksem_free(ksem_t *ks)
mutex_destroy(&ks->ks_lock);
cv_destroy(&ks->ks_cv);
kmem_free(ks, sizeof(ksem_t));
atomic_dec_uint(&nsems_total);
}
int