Aren
/
NetBSD
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Increase the default limit of SEM_MAX, allow changing of limit 

dynamically via sysctl.  Closes PR/36979.
This commit is contained in:
rmind 2007-12-06 01:27:21 +00:00
parent f2fb0b3870
commit 6fcda0686a
1 changed files with 37 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

44
sys/kern/uipc_sem.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: uipc_sem.c,v 1.21 2007/06/15 18:27:13 ad Exp $ */
/* $NetBSD: uipc_sem.c,v 1.22 2007/12/06 01:27:21 rmind Exp $ */
/*-
* Copyright (c) 2003, 2007 The NetBSD Foundation, Inc.
@ -63,7 +63,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: uipc_sem.c,v 1.21 2007/06/15 18:27:13 ad Exp $");
__KERNEL_RCSID(0, "$NetBSD: uipc_sem.c,v 1.22 2007/12/06 01:27:21 rmind Exp $");
#include "opt_posix.h"
@ -78,15 +78,13 @@ __KERNEL_RCSID(0, "$NetBSD: uipc_sem.c,v 1.21 2007/06/15 18:27:13 ad Exp $");
#include <sys/kmem.h>
#include <sys/fcntl.h>
#include <sys/kauth.h>
#include <sys/sysctl.h>
#include <sys/mount.h>
#include <sys/syscallargs.h>
#ifndef SEM_MAX
#define SEM_MAX 30
#endif
#define SEM_MAX 128
#define SEM_MAX_NAMELEN 14
#define SEM_VALUE_MAX (~0U)
#define SEM_HASHTBL_SIZE 13
@ -136,6 +134,7 @@ LIST_HEAD(ksem_list, ksem);
static kmutex_t ksem_mutex;
static struct ksem_list ksem_head = LIST_HEAD_INITIALIZER(&ksem_head);
static struct ksem_list ksem_hash[SEM_HASHTBL_SIZE];
static u_int sem_max = SEM_MAX;
static int nsems = 0;
/*
@ -347,7 +346,7 @@ ksem_create(struct lwp *l, const char *name, struct ksem **ksret,
cv_init(&ret->ks_cv, "psem");
mutex_enter(&ksem_mutex);
if (nsems >= SEM_MAX) {
if (nsems >= sem_max) {
mutex_exit(&ksem_mutex);
if (ret->ks_name != NULL)
kmem_free(ret->ks_name, ret->ks_namelen);
@ -844,3 +843,34 @@ ksem_init(void)
ksem_proc_dtor);
KASSERT(error == 0);
}
/*
* Sysctl initialization and nodes.
*/
SYSCTL_SETUP(sysctl_posix_sem_setup, "sysctl kern.posix subtree setup")
{
const struct sysctlnode *node = NULL;
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT,
CTLTYPE_NODE, "kern", NULL,
NULL, 0, NULL, 0,
CTL_KERN, CTL_EOL);
sysctl_createv(clog, 0, NULL, &node,
CTLFLAG_PERMANENT,
CTLTYPE_NODE, "posix",
SYSCTL_DESCR("POSIX options"),
NULL, 0, NULL, 0,
CTL_KERN, CTL_CREATE, CTL_EOL);
if (node == NULL)
return;
sysctl_createv(clog, 0, &node, NULL,
CTLFLAG_PERMANENT | CTLFLAG_READWRITE,
CTLTYPE_INT, "semmax",
SYSCTL_DESCR("Maximal number of semaphores"),
NULL, 0, &sem_max, 0,
CTL_CREATE, CTL_EOL);
}