From cb034b9b374927c7552e36dcbc306d8456b2a0cb Mon Sep 17 00:00:00 2001 From: Damjan Marion Date: Wed, 28 Dec 2016 18:38:59 +0100 Subject: Move java,lua api and remaining plugins to src/ Change-Id: I1c3b87e886603678368428ae56a6bd3327cbc90d Signed-off-by: Damjan Marion --- src/plugins/lb/refcount.h | 67 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 67 insertions(+) create mode 100644 src/plugins/lb/refcount.h (limited to 'src/plugins/lb/refcount.h') diff --git a/src/plugins/lb/refcount.h b/src/plugins/lb/refcount.h new file mode 100644 index 00000000..8c26e7be --- /dev/null +++ b/src/plugins/lb/refcount.h @@ -0,0 +1,67 @@ +/* + * Copyright (c) 2016 Cisco and/or its affiliates. + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at: + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +/* + * vlib provides lock-free counters but those + * - Have 16bits per-CPU counter, which may overflow. + * - Would only increment. + * + * This is very similar to vlib counters, but may be used to count reference. + * Such a counter includes an arbitrary number of counters. Each counter + * is identified by its index. This is used to aggregate per-cpu memory. + * + * Warning: + * This reference counter is lock-free but is not race-condition free. + * The counting result is approximate and another mechanism needs to be used + * in order to ensure that an object may be freed. + * + */ + +#include + +typedef struct { + u32 *counters; + u32 length; + u32 *reader_lengths; + CLIB_CACHE_LINE_ALIGN_MARK(o); +} vlib_refcount_per_cpu_t; + +typedef struct { + vlib_refcount_per_cpu_t *per_cpu; +} vlib_refcount_t; + +void __vlib_refcount_resize(vlib_refcount_per_cpu_t *per_cpu, u32 size); + +static_always_inline +void vlib_refcount_add(vlib_refcount_t *r, u32 cpu_index, u32 counter_index, i32 v) +{ + vlib_refcount_per_cpu_t *per_cpu = &r->per_cpu[cpu_index]; + if (PREDICT_FALSE(counter_index >= per_cpu->length)) + __vlib_refcount_resize(per_cpu, clib_max(counter_index + 16, per_cpu->length * 2)); + + per_cpu->counters[counter_index] += v; +} + +u64 vlib_refcount_get(vlib_refcount_t *r, u32 index); + +static_always_inline +void vlib_refcount_init(vlib_refcount_t *r) +{ + vlib_thread_main_t *tm = vlib_get_thread_main (); + r->per_cpu = 0; + vec_validate (r->per_cpu, tm->n_vlib_mains - 1); +} + + -- cgit 1.2.3-korg