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Sprinkle locking.

This commit is contained in:
ad 2008-04-23 12:50:53 +00:00
parent 50629393a5
commit a87ccd221c
1 changed files with 14 additions and 4 deletions
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18
sys/compat/linux/common/linux_exec.c
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@ -1,7 +1,7 @@
/* $NetBSD: linux_exec.c,v 1.102 2008/04/11 16:47:50 njoly Exp $ */
/* $NetBSD: linux_exec.c,v 1.103 2008/04/23 12:50:53 ad Exp $ */
/*-
* Copyright (c) 1994, 1995, 1998, 2000, 2007 The NetBSD Foundation, Inc.
* Copyright (c) 1994, 1995, 1998, 2000, 2007, 2008 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
@ -38,7 +38,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: linux_exec.c,v 1.102 2008/04/11 16:47:50 njoly Exp $");
__KERNEL_RCSID(0, "$NetBSD: linux_exec.c,v 1.103 2008/04/23 12:50:53 ad Exp $");
#include <sys/param.h>
#include <sys/systm.h>
@ -148,9 +148,11 @@ linux_e_proc_init(p, parent, forkflags)
MALLOC(e, void *, sizeof(struct linux_emuldata),
M_EMULDATA, M_WAITOK);
} else {
mutex_enter(&proclist_lock);
e->s->refs--;
if (e->s->refs == 0)
FREE(e->s, M_EMULDATA);
mutex_exit(&proclist_lock);
}
memset(e, '\0', sizeof(struct linux_emuldata));
@ -169,6 +171,7 @@ linux_e_proc_init(p, parent, forkflags)
}
#endif
s = ep->s;
mutex_enter(&proclist_lock);
s->refs++;
} else {
struct vmspace *vm;
@ -202,6 +205,7 @@ linux_e_proc_init(p, parent, forkflags)
s->xstat = 0;
s->flags = 0;
mutex_enter(&proclist_lock);
}
e->s = s;
@ -219,6 +223,7 @@ linux_e_proc_init(p, parent, forkflags)
}
#endif /* LINUX_NPTL */
mutex_exit(&proclist_lock);
p->p_emuldata = e;
}
@ -230,6 +235,7 @@ linux_e_proc_init(p, parent, forkflags)
static void
linux_e_proc_exec(struct proc *p, struct exec_package *epp)
{
/* exec, use our vmspace */
linux_e_proc_init(p, NULL, 0);
}
@ -245,15 +251,18 @@ linux_e_proc_exit(struct proc *p)
#ifdef LINUX_NPTL
linux_nptl_proc_exit(p);
#endif
/* Remove the thread for the group thread list */
mutex_enter(&proclist_lock);
LIST_REMOVE(e, threads);
/* free Linux emuldata and set the pointer to null */
e->s->refs--;
if (e->s->refs == 0)
FREE(e->s, M_EMULDATA);
FREE(e, M_EMULDATA);
p->p_emuldata = NULL;
mutex_exit(&proclist_lock);
FREE(e, M_EMULDATA);
}
/*
@ -264,6 +273,7 @@ linux_e_proc_fork(p, parent, forkflags)
struct proc *p, *parent;
int forkflags;
{
/*
* The new process might share some vmspace-related stuff
* with parent, depending on fork flags (CLONE_VM et.al).