e4a683c899
Add kref_test_and_get() function, which atomically add a reference only if refcount is not zero. This prevent to add a reference to an object that is already being removed. Signed-off-by: Jerome Marchand <jmarchan@redhat.com> Cc: stable@kernel.org Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
29 lines
680 B
C
29 lines
680 B
C
/*
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* kref.h - library routines for handling generic reference counted objects
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*
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* Copyright (C) 2004 Greg Kroah-Hartman <greg@kroah.com>
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* Copyright (C) 2004 IBM Corp.
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*
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* based on kobject.h which was:
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* Copyright (C) 2002-2003 Patrick Mochel <mochel@osdl.org>
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* Copyright (C) 2002-2003 Open Source Development Labs
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*
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* This file is released under the GPLv2.
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*
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*/
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#ifndef _KREF_H_
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#define _KREF_H_
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#include <linux/types.h>
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struct kref {
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atomic_t refcount;
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};
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void kref_init(struct kref *kref);
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void kref_get(struct kref *kref);
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int kref_test_and_get(struct kref *kref);
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int kref_put(struct kref *kref, void (*release) (struct kref *kref));
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#endif /* _KREF_H_ */
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