Blame view
lib/kref.c
2.6 KB
1da177e4c Linux-2.6.12-rc2 |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 |
/* * kref.c - library routines for handling generic reference counted objects * * Copyright (C) 2004 Greg Kroah-Hartman <greg@kroah.com> * Copyright (C) 2004 IBM Corp. * * based on lib/kobject.c which was: * Copyright (C) 2002-2003 Patrick Mochel <mochel@osdl.org> * * This file is released under the GPLv2. * */ #include <linux/kref.h> #include <linux/module.h> |
5a0e3ad6a include cleanup: ... |
16 |
#include <linux/slab.h> |
1da177e4c Linux-2.6.12-rc2 |
17 18 19 20 21 22 23 |
/** * kref_init - initialize object. * @kref: object in question. */ void kref_init(struct kref *kref) { |
db1afffab kref: remove kref... |
24 25 |
atomic_set(&kref->refcount, 1); smp_mb(); |
1da177e4c Linux-2.6.12-rc2 |
26 27 28 29 30 31 32 33 34 35 |
} /** * kref_get - increment refcount for object. * @kref: object. */ void kref_get(struct kref *kref) { WARN_ON(!atomic_read(&kref->refcount)); atomic_inc(&kref->refcount); |
1b0b3b998 kref: fix CPU ord... |
36 |
smp_mb__after_atomic_inc(); |
1da177e4c Linux-2.6.12-rc2 |
37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 |
} /** * kref_put - decrement refcount for object. * @kref: object. * @release: pointer to the function that will clean up the object when the * last reference to the object is released. * This pointer is required, and it is not acceptable to pass kfree * in as this function. * * Decrement the refcount, and if 0, call release(). * Return 1 if the object was removed, otherwise return 0. Beware, if this * function returns 0, you still can not count on the kref from remaining in * memory. Only use the return value if you want to see if the kref is now * gone, not present. */ int kref_put(struct kref *kref, void (*release)(struct kref *kref)) { WARN_ON(release == NULL); WARN_ON(release == (void (*)(struct kref *))kfree); |
f334b60b4 kref refcnt and f... |
57 |
if (atomic_dec_and_test(&kref->refcount)) { |
1da177e4c Linux-2.6.12-rc2 |
58 59 60 61 62 |
release(kref); return 1; } return 0; } |
ecf7ace9a kref: Add a kref_... |
63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 |
/** * kref_sub - subtract a number of refcounts for object. * @kref: object. * @count: Number of recounts to subtract. * @release: pointer to the function that will clean up the object when the * last reference to the object is released. * This pointer is required, and it is not acceptable to pass kfree * in as this function. * * Subtract @count from the refcount, and if 0, call release(). * Return 1 if the object was removed, otherwise return 0. Beware, if this * function returns 0, you still can not count on the kref from remaining in * memory. Only use the return value if you want to see if the kref is now * gone, not present. */ int kref_sub(struct kref *kref, unsigned int count, void (*release)(struct kref *kref)) { WARN_ON(release == NULL); WARN_ON(release == (void (*)(struct kref *))kfree); if (atomic_sub_and_test((int) count, &kref->refcount)) { release(kref); return 1; } return 0; } |
1da177e4c Linux-2.6.12-rc2 |
91 92 93 |
EXPORT_SYMBOL(kref_init); EXPORT_SYMBOL(kref_get); EXPORT_SYMBOL(kref_put); |
ecf7ace9a kref: Add a kref_... |
94 |
EXPORT_SYMBOL(kref_sub); |