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libnm: make NMLldpNeighbor ref-counting thread-safe

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At least ref-counting should be thread safe for our public API.

Note that NMLldpNeighbor has no public API for mutating a neighbor
instance. Especially for immutable types, it is very attractive that
ref-counting is thread-safe.

Also use slice allocator for NMLldpNeighbor structs.
This commit is contained in:
Thomas Haller 2021-03-11 08:24:47 +01:00
parent cc7bf676eb
commit f8e19f805f
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GPG key ID: 29C2366E4DFC5728
1 changed files with 16 additions and 8 deletions
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24
src/libnm-client-impl/nm-device.c
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@ -134,7 +134,7 @@ static NMLldpNeighbor *nm_lldp_neighbor_dup(NMLldpNeighbor *neighbor);
/*****************************************************************************/
struct _NMLldpNeighbor {
guint refcount;
int refcount;
GHashTable *attrs;
};
@ -2881,10 +2881,14 @@ nm_lldp_neighbor_new(void)
{
NMLldpNeighbor *neigh;
neigh = g_new0(NMLldpNeighbor, 1);
neigh->refcount = 1;
neigh->attrs =
g_hash_table_new_full(nm_str_hash, g_str_equal, g_free, (GDestroyNotify) g_variant_unref);
neigh = g_slice_new(NMLldpNeighbor);
*neigh = (NMLldpNeighbor){
.refcount = 1,
.attrs = g_hash_table_new_full(nm_str_hash,
g_str_equal,
g_free,
(GDestroyNotify) g_variant_unref),
};
return neigh;
}
@ -2912,6 +2916,8 @@ nm_lldp_neighbor_dup(NMLldpNeighbor *neighbor)
*
* Increases the reference count of the object.
*
* Since 1.32, ref-counting of #NMLldpNeighbor is thread-safe.
*
* Since: 1.2
**/
void
@ -2919,7 +2925,7 @@ nm_lldp_neighbor_ref(NMLldpNeighbor *neighbor)
{
g_return_if_fail(NM_IS_LLDP_NEIGHBOR(neighbor));
neighbor->refcount++;
g_atomic_int_inc(&neighbor->refcount);
}
/**
@ -2929,6 +2935,8 @@ nm_lldp_neighbor_ref(NMLldpNeighbor *neighbor)
* Decreases the reference count of the object. If the reference count
* reaches zero, the object will be destroyed.
*
* Since 1.32, ref-counting of #NMLldpNeighbor is thread-safe.
*
* Since: 1.2
**/
void
@ -2936,9 +2944,9 @@ nm_lldp_neighbor_unref(NMLldpNeighbor *neighbor)
{
g_return_if_fail(NM_IS_LLDP_NEIGHBOR(neighbor));
if (--neighbor->refcount == 0) {
if (g_atomic_int_dec_and_test(&neighbor->refcount)) {
g_hash_table_unref(neighbor->attrs);
g_free(neighbor);
nm_g_slice_free(neighbor);
}
}