Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 1 | /* |
| 2 | * |
Craig Tiller | 6169d5f | 2016-03-31 07:46:18 -0700 | [diff] [blame] | 3 | * Copyright 2015, Google Inc. |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 4 | * All rights reserved. |
| 5 | * |
| 6 | * Redistribution and use in source and binary forms, with or without |
| 7 | * modification, are permitted provided that the following conditions are |
| 8 | * met: |
| 9 | * |
| 10 | * * Redistributions of source code must retain the above copyright |
| 11 | * notice, this list of conditions and the following disclaimer. |
| 12 | * * Redistributions in binary form must reproduce the above |
| 13 | * copyright notice, this list of conditions and the following disclaimer |
| 14 | * in the documentation and/or other materials provided with the |
| 15 | * distribution. |
| 16 | * * Neither the name of Google Inc. nor the names of its |
| 17 | * contributors may be used to endorse or promote products derived from |
| 18 | * this software without specific prior written permission. |
| 19 | * |
| 20 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 21 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 22 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| 23 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| 24 | * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 25 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| 26 | * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 27 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 28 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 29 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| 30 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 31 | * |
| 32 | */ |
| 33 | |
Craig Tiller | 9533d04 | 2016-03-25 17:11:06 -0700 | [diff] [blame] | 34 | #include "src/core/lib/transport/metadata.h" |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 35 | |
Craig Tiller | 9fa41b9 | 2015-04-10 15:08:03 -0700 | [diff] [blame] | 36 | #include <assert.h> |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 37 | #include <stddef.h> |
| 38 | #include <string.h> |
| 39 | |
Craig Tiller | ebdef9d | 2015-11-19 17:09:49 -0800 | [diff] [blame] | 40 | #include <grpc/compression.h> |
yang-g | cb7a802 | 2016-03-30 14:58:53 -0700 | [diff] [blame] | 41 | #include <grpc/grpc.h> |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 42 | #include <grpc/support/alloc.h> |
Craig Tiller | 9fa41b9 | 2015-04-10 15:08:03 -0700 | [diff] [blame] | 43 | #include <grpc/support/atm.h> |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 44 | #include <grpc/support/log.h> |
Craig Tiller | ebdef9d | 2015-11-19 17:09:49 -0800 | [diff] [blame] | 45 | #include <grpc/support/string_util.h> |
Craig Tiller | 9d35a1f | 2015-11-02 14:16:12 -0800 | [diff] [blame] | 46 | #include <grpc/support/time.h> |
Craig Tiller | 0cb803d | 2016-03-02 22:17:24 -0800 | [diff] [blame] | 47 | |
Craig Tiller | 9533d04 | 2016-03-25 17:11:06 -0700 | [diff] [blame] | 48 | #include "src/core/lib/iomgr/iomgr_internal.h" |
| 49 | #include "src/core/lib/profiling/timers.h" |
Craig Tiller | a59c16c | 2016-10-31 07:25:01 -0700 | [diff] [blame] | 50 | #include "src/core/lib/slice/slice_internal.h" |
Craig Tiller | 9533d04 | 2016-03-25 17:11:06 -0700 | [diff] [blame] | 51 | #include "src/core/lib/support/murmur_hash.h" |
| 52 | #include "src/core/lib/support/string.h" |
Craig Tiller | 9533d04 | 2016-03-25 17:11:06 -0700 | [diff] [blame] | 53 | #include "src/core/lib/transport/static_metadata.h" |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 54 | |
Craig Tiller | 70b080d | 2015-11-19 08:04:48 -0800 | [diff] [blame] | 55 | /* There are two kinds of mdelem and mdstr instances. |
| 56 | * Static instances are declared in static_metadata.{h,c} and |
| 57 | * are initialized by grpc_mdctx_global_init(). |
| 58 | * Dynamic instances are stored in hash tables on grpc_mdctx, and are backed |
| 59 | * by internal_string and internal_element structures. |
| 60 | * Internal helper functions here-in (is_mdstr_static, is_mdelem_static) are |
| 61 | * used to determine which kind of element a pointer refers to. |
| 62 | */ |
| 63 | |
Craig Tiller | 1a65a23 | 2015-07-06 10:22:32 -0700 | [diff] [blame] | 64 | #ifdef GRPC_METADATA_REFCOUNT_DEBUG |
| 65 | #define DEBUG_ARGS , const char *file, int line |
| 66 | #define FWD_DEBUG_ARGS , file, line |
Craig Tiller | b2b4261 | 2015-11-20 12:02:17 -0800 | [diff] [blame] | 67 | #define REF_MD_LOCKED(shard, s) ref_md_locked((shard), (s), __FILE__, __LINE__) |
Craig Tiller | 1a65a23 | 2015-07-06 10:22:32 -0700 | [diff] [blame] | 68 | #else |
| 69 | #define DEBUG_ARGS |
| 70 | #define FWD_DEBUG_ARGS |
Craig Tiller | b2b4261 | 2015-11-20 12:02:17 -0800 | [diff] [blame] | 71 | #define REF_MD_LOCKED(shard, s) ref_md_locked((shard), (s)) |
Craig Tiller | 1a65a23 | 2015-07-06 10:22:32 -0700 | [diff] [blame] | 72 | #endif |
| 73 | |
Craig Tiller | e52bbb1 | 2016-11-10 15:34:06 -0800 | [diff] [blame] | 74 | #define INITIAL_SHARD_CAPACITY 8 |
| 75 | #define LOG2_SHARD_COUNT 4 |
| 76 | #define SHARD_COUNT ((size_t)(1 << LOG2_SHARD_COUNT)) |
| 77 | |
| 78 | #define TABLE_IDX(hash, capacity) (((hash) >> (LOG2_SHARD_COUNT)) % (capacity)) |
| 79 | #define SHARD_IDX(hash) ((hash) & ((1 << (LOG2_SHARD_COUNT)) - 1)) |
Craig Tiller | b2b4261 | 2015-11-20 12:02:17 -0800 | [diff] [blame] | 80 | |
Craig Tiller | 8344daa | 2015-10-09 18:10:57 -0700 | [diff] [blame] | 81 | typedef void (*destroy_user_data_func)(void *user_data); |
| 82 | |
Craig Tiller | 9ecadce | 2016-11-18 14:52:25 -0800 | [diff] [blame^] | 83 | /* Shadow structure for grpc_mdelem_data for interned elements */ |
| 84 | typedef struct interned_metadata { |
| 85 | /* must be byte compatible with grpc_mdelem_data */ |
Craig Tiller | e52bbb1 | 2016-11-10 15:34:06 -0800 | [diff] [blame] | 86 | grpc_slice key; |
| 87 | grpc_slice value; |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 88 | |
Craig Tiller | b2b4261 | 2015-11-20 12:02:17 -0800 | [diff] [blame] | 89 | /* private only data */ |
Craig Tiller | 9fa41b9 | 2015-04-10 15:08:03 -0700 | [diff] [blame] | 90 | gpr_atm refcnt; |
| 91 | |
Craig Tiller | 8390153 | 2015-07-10 14:02:45 -0700 | [diff] [blame] | 92 | gpr_mu mu_user_data; |
Craig Tiller | 8344daa | 2015-10-09 18:10:57 -0700 | [diff] [blame] | 93 | gpr_atm destroy_user_data; |
| 94 | gpr_atm user_data; |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 95 | |
Craig Tiller | 9ecadce | 2016-11-18 14:52:25 -0800 | [diff] [blame^] | 96 | struct interned_metadata *bucket_next; |
| 97 | } interned_metadata; |
| 98 | |
| 99 | /* Shadow structure for grpc_mdelem_data for allocated elements */ |
| 100 | typedef struct allocated_metadata { |
| 101 | /* must be byte compatible with grpc_mdelem_data */ |
| 102 | grpc_slice key; |
| 103 | grpc_slice value; |
| 104 | |
| 105 | /* private only data */ |
| 106 | gpr_atm refcnt; |
| 107 | } allocated_metadata; |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 108 | |
Craig Tiller | b2b4261 | 2015-11-20 12:02:17 -0800 | [diff] [blame] | 109 | typedef struct mdtab_shard { |
| 110 | gpr_mu mu; |
Craig Tiller | 9ecadce | 2016-11-18 14:52:25 -0800 | [diff] [blame^] | 111 | interned_metadata **elems; |
Craig Tiller | b2b4261 | 2015-11-20 12:02:17 -0800 | [diff] [blame] | 112 | size_t count; |
| 113 | size_t capacity; |
Craig Tiller | 8d8f9a8 | 2016-06-03 08:49:11 -0700 | [diff] [blame] | 114 | /** Estimate of the number of unreferenced mdelems in the hash table. |
| 115 | This will eventually converge to the exact number, but it's instantaneous |
| 116 | accuracy is not guaranteed */ |
| 117 | gpr_atm free_estimate; |
Craig Tiller | b2b4261 | 2015-11-20 12:02:17 -0800 | [diff] [blame] | 118 | } mdtab_shard; |
Craig Tiller | 0e72ede | 2015-11-19 07:48:53 -0800 | [diff] [blame] | 119 | |
Craig Tiller | e52bbb1 | 2016-11-10 15:34:06 -0800 | [diff] [blame] | 120 | static mdtab_shard g_shards[SHARD_COUNT]; |
Craig Tiller | b2b4261 | 2015-11-20 12:02:17 -0800 | [diff] [blame] | 121 | |
Craig Tiller | a59c16c | 2016-10-31 07:25:01 -0700 | [diff] [blame] | 122 | static void gc_mdtab(grpc_exec_ctx *exec_ctx, mdtab_shard *shard); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 123 | |
Craig Tiller | 0e72ede | 2015-11-19 07:48:53 -0800 | [diff] [blame] | 124 | void grpc_mdctx_global_init(void) { |
Craig Tiller | b2b4261 | 2015-11-20 12:02:17 -0800 | [diff] [blame] | 125 | /* initialize shards */ |
Craig Tiller | 1ad51e0 | 2016-11-17 16:42:21 -0800 | [diff] [blame] | 126 | for (size_t i = 0; i < SHARD_COUNT; i++) { |
Craig Tiller | e52bbb1 | 2016-11-10 15:34:06 -0800 | [diff] [blame] | 127 | mdtab_shard *shard = &g_shards[i]; |
Craig Tiller | b2b4261 | 2015-11-20 12:02:17 -0800 | [diff] [blame] | 128 | gpr_mu_init(&shard->mu); |
| 129 | shard->count = 0; |
Craig Tiller | 8d8f9a8 | 2016-06-03 08:49:11 -0700 | [diff] [blame] | 130 | gpr_atm_no_barrier_store(&shard->free_estimate, 0); |
Craig Tiller | e52bbb1 | 2016-11-10 15:34:06 -0800 | [diff] [blame] | 131 | shard->capacity = INITIAL_SHARD_CAPACITY; |
Craig Tiller | b2b4261 | 2015-11-20 12:02:17 -0800 | [diff] [blame] | 132 | shard->elems = gpr_malloc(sizeof(*shard->elems) * shard->capacity); |
| 133 | memset(shard->elems, 0, sizeof(*shard->elems) * shard->capacity); |
Craig Tiller | 0e72ede | 2015-11-19 07:48:53 -0800 | [diff] [blame] | 134 | } |
| 135 | } |
| 136 | |
Craig Tiller | a59c16c | 2016-10-31 07:25:01 -0700 | [diff] [blame] | 137 | void grpc_mdctx_global_shutdown(grpc_exec_ctx *exec_ctx) { |
Craig Tiller | 1ad51e0 | 2016-11-17 16:42:21 -0800 | [diff] [blame] | 138 | for (size_t i = 0; i < SHARD_COUNT; i++) { |
Craig Tiller | e52bbb1 | 2016-11-10 15:34:06 -0800 | [diff] [blame] | 139 | mdtab_shard *shard = &g_shards[i]; |
Craig Tiller | b2b4261 | 2015-11-20 12:02:17 -0800 | [diff] [blame] | 140 | gpr_mu_destroy(&shard->mu); |
Craig Tiller | a59c16c | 2016-10-31 07:25:01 -0700 | [diff] [blame] | 141 | gc_mdtab(exec_ctx, shard); |
Craig Tiller | 3407544 | 2015-11-23 16:16:54 -0800 | [diff] [blame] | 142 | /* TODO(ctiller): GPR_ASSERT(shard->count == 0); */ |
| 143 | if (shard->count != 0) { |
Yuchen Zeng | 64c0e8d | 2016-06-10 11:19:51 -0700 | [diff] [blame] | 144 | gpr_log(GPR_DEBUG, "WARNING: %" PRIuPTR " metadata elements were leaked", |
yang-g | d88e1d8 | 2015-12-02 13:23:33 -0800 | [diff] [blame] | 145 | shard->count); |
Craig Tiller | 0cb803d | 2016-03-02 22:17:24 -0800 | [diff] [blame] | 146 | if (grpc_iomgr_abort_on_leaks()) { |
| 147 | abort(); |
| 148 | } |
Craig Tiller | 3407544 | 2015-11-23 16:16:54 -0800 | [diff] [blame] | 149 | } |
Craig Tiller | b2b4261 | 2015-11-20 12:02:17 -0800 | [diff] [blame] | 150 | gpr_free(shard->elems); |
| 151 | } |
Craig Tiller | 0e72ede | 2015-11-19 07:48:53 -0800 | [diff] [blame] | 152 | } |
| 153 | |
Craig Tiller | 0160de9 | 2016-11-18 08:46:46 -0800 | [diff] [blame] | 154 | static int is_mdelem_static(grpc_mdelem e) { |
Craig Tiller | 9ecadce | 2016-11-18 14:52:25 -0800 | [diff] [blame^] | 155 | return GRPC_MDELEM_DATA(e) >= &grpc_static_mdelem_table[0] && |
| 156 | GRPC_MDELEM_DATA(e) < |
| 157 | &grpc_static_mdelem_table[GRPC_STATIC_MDELEM_COUNT]; |
Craig Tiller | 0e72ede | 2015-11-19 07:48:53 -0800 | [diff] [blame] | 158 | } |
| 159 | |
Craig Tiller | b2b4261 | 2015-11-20 12:02:17 -0800 | [diff] [blame] | 160 | static void ref_md_locked(mdtab_shard *shard, |
Craig Tiller | 9ecadce | 2016-11-18 14:52:25 -0800 | [diff] [blame^] | 161 | interned_metadata *md DEBUG_ARGS) { |
Craig Tiller | 1a65a23 | 2015-07-06 10:22:32 -0700 | [diff] [blame] | 162 | #ifdef GRPC_METADATA_REFCOUNT_DEBUG |
| 163 | gpr_log(file, line, GPR_LOG_SEVERITY_DEBUG, |
David Garcia Quintas | 331b9c0 | 2016-09-12 18:37:05 -0700 | [diff] [blame] | 164 | "ELM REF:%p:%zu->%zu: '%s' = '%s'", (void *)md, |
Craig Tiller | 1a65a23 | 2015-07-06 10:22:32 -0700 | [diff] [blame] | 165 | gpr_atm_no_barrier_load(&md->refcnt), |
| 166 | gpr_atm_no_barrier_load(&md->refcnt) + 1, |
Craig Tiller | 5ef31ab | 2016-11-10 16:27:48 -0800 | [diff] [blame] | 167 | grpc_mdstr_as_c_string((grpc_slice)md->key), |
| 168 | grpc_mdstr_as_c_string((grpc_slice)md->value)); |
Craig Tiller | 1a65a23 | 2015-07-06 10:22:32 -0700 | [diff] [blame] | 169 | #endif |
Craig Tiller | 8d8f9a8 | 2016-06-03 08:49:11 -0700 | [diff] [blame] | 170 | if (0 == gpr_atm_no_barrier_fetch_add(&md->refcnt, 1)) { |
| 171 | gpr_atm_no_barrier_fetch_add(&shard->free_estimate, -1); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 172 | } |
| 173 | } |
| 174 | |
Craig Tiller | a59c16c | 2016-10-31 07:25:01 -0700 | [diff] [blame] | 175 | static void gc_mdtab(grpc_exec_ctx *exec_ctx, mdtab_shard *shard) { |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 176 | size_t i; |
Craig Tiller | 9ecadce | 2016-11-18 14:52:25 -0800 | [diff] [blame^] | 177 | interned_metadata **prev_next; |
| 178 | interned_metadata *md, *next; |
Craig Tiller | 8d8f9a8 | 2016-06-03 08:49:11 -0700 | [diff] [blame] | 179 | gpr_atm num_freed = 0; |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 180 | |
Craig Tiller | 9d35a1f | 2015-11-02 14:16:12 -0800 | [diff] [blame] | 181 | GPR_TIMER_BEGIN("gc_mdtab", 0); |
Craig Tiller | b2b4261 | 2015-11-20 12:02:17 -0800 | [diff] [blame] | 182 | for (i = 0; i < shard->capacity; i++) { |
| 183 | prev_next = &shard->elems[i]; |
| 184 | for (md = shard->elems[i]; md; md = next) { |
Craig Tiller | 8344daa | 2015-10-09 18:10:57 -0700 | [diff] [blame] | 185 | void *user_data = (void *)gpr_atm_no_barrier_load(&md->user_data); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 186 | next = md->bucket_next; |
Craig Tiller | 9fa41b9 | 2015-04-10 15:08:03 -0700 | [diff] [blame] | 187 | if (gpr_atm_acq_load(&md->refcnt) == 0) { |
Craig Tiller | e52bbb1 | 2016-11-10 15:34:06 -0800 | [diff] [blame] | 188 | grpc_slice_unref_internal(exec_ctx, md->key); |
| 189 | grpc_slice_unref_internal(exec_ctx, md->value); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 190 | if (md->user_data) { |
Craig Tiller | 8344daa | 2015-10-09 18:10:57 -0700 | [diff] [blame] | 191 | ((destroy_user_data_func)gpr_atm_no_barrier_load( |
| 192 | &md->destroy_user_data))(user_data); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 193 | } |
| 194 | gpr_free(md); |
| 195 | *prev_next = next; |
Craig Tiller | 8d8f9a8 | 2016-06-03 08:49:11 -0700 | [diff] [blame] | 196 | num_freed++; |
Craig Tiller | b2b4261 | 2015-11-20 12:02:17 -0800 | [diff] [blame] | 197 | shard->count--; |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 198 | } else { |
| 199 | prev_next = &md->bucket_next; |
| 200 | } |
| 201 | } |
| 202 | } |
Craig Tiller | 8d8f9a8 | 2016-06-03 08:49:11 -0700 | [diff] [blame] | 203 | gpr_atm_no_barrier_fetch_add(&shard->free_estimate, -num_freed); |
Craig Tiller | 9d35a1f | 2015-11-02 14:16:12 -0800 | [diff] [blame] | 204 | GPR_TIMER_END("gc_mdtab", 0); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 205 | } |
| 206 | |
Craig Tiller | b2b4261 | 2015-11-20 12:02:17 -0800 | [diff] [blame] | 207 | static void grow_mdtab(mdtab_shard *shard) { |
| 208 | size_t capacity = shard->capacity * 2; |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 209 | size_t i; |
Craig Tiller | 9ecadce | 2016-11-18 14:52:25 -0800 | [diff] [blame^] | 210 | interned_metadata **mdtab; |
| 211 | interned_metadata *md, *next; |
Craig Tiller | 7536af0 | 2015-12-22 13:49:30 -0800 | [diff] [blame] | 212 | uint32_t hash; |
Craig Tiller | 9d35a1f | 2015-11-02 14:16:12 -0800 | [diff] [blame] | 213 | |
| 214 | GPR_TIMER_BEGIN("grow_mdtab", 0); |
| 215 | |
Craig Tiller | 9ecadce | 2016-11-18 14:52:25 -0800 | [diff] [blame^] | 216 | mdtab = gpr_malloc(sizeof(interned_metadata *) * capacity); |
| 217 | memset(mdtab, 0, sizeof(interned_metadata *) * capacity); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 218 | |
Craig Tiller | b2b4261 | 2015-11-20 12:02:17 -0800 | [diff] [blame] | 219 | for (i = 0; i < shard->capacity; i++) { |
| 220 | for (md = shard->elems[i]; md; md = next) { |
| 221 | size_t idx; |
Craig Tiller | e52bbb1 | 2016-11-10 15:34:06 -0800 | [diff] [blame] | 222 | hash = GRPC_MDSTR_KV_HASH(grpc_slice_hash(md->key), |
| 223 | grpc_slice_hash(md->value)); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 224 | next = md->bucket_next; |
Craig Tiller | e52bbb1 | 2016-11-10 15:34:06 -0800 | [diff] [blame] | 225 | idx = TABLE_IDX(hash, capacity); |
Craig Tiller | b2b4261 | 2015-11-20 12:02:17 -0800 | [diff] [blame] | 226 | md->bucket_next = mdtab[idx]; |
| 227 | mdtab[idx] = md; |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 228 | } |
| 229 | } |
| 230 | |
Craig Tiller | b2b4261 | 2015-11-20 12:02:17 -0800 | [diff] [blame] | 231 | gpr_free(shard->elems); |
| 232 | shard->elems = mdtab; |
| 233 | shard->capacity = capacity; |
Craig Tiller | 9d35a1f | 2015-11-02 14:16:12 -0800 | [diff] [blame] | 234 | |
| 235 | GPR_TIMER_END("grow_mdtab", 0); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 236 | } |
| 237 | |
Craig Tiller | a59c16c | 2016-10-31 07:25:01 -0700 | [diff] [blame] | 238 | static void rehash_mdtab(grpc_exec_ctx *exec_ctx, mdtab_shard *shard) { |
Craig Tiller | 139098c | 2016-06-06 08:10:08 -0700 | [diff] [blame] | 239 | if (gpr_atm_no_barrier_load(&shard->free_estimate) > |
| 240 | (gpr_atm)(shard->capacity / 4)) { |
Craig Tiller | a59c16c | 2016-10-31 07:25:01 -0700 | [diff] [blame] | 241 | gc_mdtab(exec_ctx, shard); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 242 | } else { |
Craig Tiller | b2b4261 | 2015-11-20 12:02:17 -0800 | [diff] [blame] | 243 | grow_mdtab(shard); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 244 | } |
| 245 | } |
| 246 | |
Craig Tiller | 9ecadce | 2016-11-18 14:52:25 -0800 | [diff] [blame^] | 247 | grpc_mdelem grpc_mdelem_create( |
| 248 | grpc_exec_ctx *exec_ctx, grpc_slice key, grpc_slice value, |
| 249 | grpc_mdelem_data *compatible_external_backing_store) { |
| 250 | if (!grpc_slice_is_interned(key) || !grpc_slice_is_interned(value)) { |
| 251 | if (compatible_external_backing_store != NULL) { |
| 252 | return GRPC_MAKE_MDELEM(compatible_external_backing_store, |
| 253 | GRPC_MDELEM_STORAGE_EXTERNAL); |
| 254 | } |
| 255 | |
| 256 | allocated_metadata *allocated = gpr_malloc(sizeof(*allocated)); |
| 257 | allocated->key = grpc_slice_ref_internal(key); |
| 258 | allocated->value = grpc_slice_ref_internal(value); |
| 259 | gpr_atm_rel_store(&allocated->refcnt, 1); |
| 260 | return GRPC_MAKE_MDELEM(allocated, GRPC_MDELEM_STORAGE_ALLOCATED); |
| 261 | } |
Craig Tiller | 1ad51e0 | 2016-11-17 16:42:21 -0800 | [diff] [blame] | 262 | |
Craig Tiller | 0160de9 | 2016-11-18 08:46:46 -0800 | [diff] [blame] | 263 | grpc_mdelem static_elem = grpc_static_mdelem_for_static_strings( |
Craig Tiller | 1ad51e0 | 2016-11-17 16:42:21 -0800 | [diff] [blame] | 264 | grpc_static_metadata_index(key), grpc_static_metadata_index(value)); |
Craig Tiller | 0160de9 | 2016-11-18 08:46:46 -0800 | [diff] [blame] | 265 | if (!GRPC_MDISNULL(static_elem)) { |
Craig Tiller | 1ad51e0 | 2016-11-17 16:42:21 -0800 | [diff] [blame] | 266 | return static_elem; |
| 267 | } |
| 268 | |
Craig Tiller | e52bbb1 | 2016-11-10 15:34:06 -0800 | [diff] [blame] | 269 | uint32_t hash = |
| 270 | GRPC_MDSTR_KV_HASH(grpc_slice_hash(key), grpc_slice_hash(value)); |
Craig Tiller | 9ecadce | 2016-11-18 14:52:25 -0800 | [diff] [blame^] | 271 | interned_metadata *md; |
Craig Tiller | e52bbb1 | 2016-11-10 15:34:06 -0800 | [diff] [blame] | 272 | mdtab_shard *shard = &g_shards[SHARD_IDX(hash)]; |
Craig Tiller | b2b4261 | 2015-11-20 12:02:17 -0800 | [diff] [blame] | 273 | size_t idx; |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 274 | |
Craig Tiller | 9d35a1f | 2015-11-02 14:16:12 -0800 | [diff] [blame] | 275 | GPR_TIMER_BEGIN("grpc_mdelem_from_metadata_strings", 0); |
| 276 | |
Craig Tiller | b2b4261 | 2015-11-20 12:02:17 -0800 | [diff] [blame] | 277 | gpr_mu_lock(&shard->mu); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 278 | |
Craig Tiller | e52bbb1 | 2016-11-10 15:34:06 -0800 | [diff] [blame] | 279 | idx = TABLE_IDX(hash, shard->capacity); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 280 | /* search for an existing pair */ |
Craig Tiller | b2b4261 | 2015-11-20 12:02:17 -0800 | [diff] [blame] | 281 | for (md = shard->elems[idx]; md; md = md->bucket_next) { |
Craig Tiller | e52bbb1 | 2016-11-10 15:34:06 -0800 | [diff] [blame] | 282 | if (grpc_slice_cmp(key, md->key) == 0 && |
| 283 | grpc_slice_cmp(value, md->value) == 0) { |
Craig Tiller | b2b4261 | 2015-11-20 12:02:17 -0800 | [diff] [blame] | 284 | REF_MD_LOCKED(shard, md); |
Craig Tiller | b2b4261 | 2015-11-20 12:02:17 -0800 | [diff] [blame] | 285 | gpr_mu_unlock(&shard->mu); |
Craig Tiller | 9d35a1f | 2015-11-02 14:16:12 -0800 | [diff] [blame] | 286 | GPR_TIMER_END("grpc_mdelem_from_metadata_strings", 0); |
Craig Tiller | 9ecadce | 2016-11-18 14:52:25 -0800 | [diff] [blame^] | 287 | return GRPC_MAKE_MDELEM(md, GRPC_MDELEM_STORAGE_INTERNED); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 288 | } |
| 289 | } |
| 290 | |
| 291 | /* not found: create a new pair */ |
Craig Tiller | 9ecadce | 2016-11-18 14:52:25 -0800 | [diff] [blame^] | 292 | md = gpr_malloc(sizeof(interned_metadata)); |
Craig Tiller | 8d8f9a8 | 2016-06-03 08:49:11 -0700 | [diff] [blame] | 293 | gpr_atm_rel_store(&md->refcnt, 1); |
Craig Tiller | 9ecadce | 2016-11-18 14:52:25 -0800 | [diff] [blame^] | 294 | md->key = grpc_slice_ref_internal(key); |
| 295 | md->value = grpc_slice_ref_internal(value); |
Craig Tiller | 8344daa | 2015-10-09 18:10:57 -0700 | [diff] [blame] | 296 | md->user_data = 0; |
| 297 | md->destroy_user_data = 0; |
Craig Tiller | b2b4261 | 2015-11-20 12:02:17 -0800 | [diff] [blame] | 298 | md->bucket_next = shard->elems[idx]; |
| 299 | shard->elems[idx] = md; |
Craig Tiller | 8390153 | 2015-07-10 14:02:45 -0700 | [diff] [blame] | 300 | gpr_mu_init(&md->mu_user_data); |
Craig Tiller | 1a65a23 | 2015-07-06 10:22:32 -0700 | [diff] [blame] | 301 | #ifdef GRPC_METADATA_REFCOUNT_DEBUG |
David Garcia Quintas | 331b9c0 | 2016-09-12 18:37:05 -0700 | [diff] [blame] | 302 | gpr_log(GPR_DEBUG, "ELM NEW:%p:%zu: '%s' = '%s'", (void *)md, |
Craig Tiller | 1a65a23 | 2015-07-06 10:22:32 -0700 | [diff] [blame] | 303 | gpr_atm_no_barrier_load(&md->refcnt), |
Craig Tiller | 5ef31ab | 2016-11-10 16:27:48 -0800 | [diff] [blame] | 304 | grpc_mdstr_as_c_string((grpc_slice)md->key), |
| 305 | grpc_mdstr_as_c_string((grpc_slice)md->value)); |
Craig Tiller | 1a65a23 | 2015-07-06 10:22:32 -0700 | [diff] [blame] | 306 | #endif |
Craig Tiller | b2b4261 | 2015-11-20 12:02:17 -0800 | [diff] [blame] | 307 | shard->count++; |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 308 | |
Craig Tiller | b2b4261 | 2015-11-20 12:02:17 -0800 | [diff] [blame] | 309 | if (shard->count > shard->capacity * 2) { |
Craig Tiller | a59c16c | 2016-10-31 07:25:01 -0700 | [diff] [blame] | 310 | rehash_mdtab(exec_ctx, shard); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 311 | } |
| 312 | |
Craig Tiller | b2b4261 | 2015-11-20 12:02:17 -0800 | [diff] [blame] | 313 | gpr_mu_unlock(&shard->mu); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 314 | |
Craig Tiller | 9d35a1f | 2015-11-02 14:16:12 -0800 | [diff] [blame] | 315 | GPR_TIMER_END("grpc_mdelem_from_metadata_strings", 0); |
| 316 | |
Craig Tiller | 9ecadce | 2016-11-18 14:52:25 -0800 | [diff] [blame^] | 317 | return GRPC_MAKE_MDELEM(md, GRPC_MDELEM_STORAGE_INTERNED); |
| 318 | } |
| 319 | |
| 320 | grpc_mdelem grpc_mdelem_from_slices(grpc_exec_ctx *exec_ctx, grpc_slice key, |
| 321 | grpc_slice value) { |
| 322 | grpc_mdelem out = grpc_mdelem_create(exec_ctx, key, value, NULL); |
| 323 | grpc_slice_unref_internal(exec_ctx, key); |
| 324 | grpc_slice_unref_internal(exec_ctx, value); |
| 325 | return out; |
| 326 | } |
| 327 | |
| 328 | grpc_mdelem grpc_mdelem_from_grpc_metadata(grpc_exec_ctx *exec_ctx, |
| 329 | grpc_metadata *metadata) { |
| 330 | return grpc_mdelem_create(exec_ctx, metadata->key, metadata->value, |
| 331 | (grpc_mdelem_data *)metadata); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 332 | } |
| 333 | |
yang-g | 24ba7c1 | 2016-03-30 16:19:43 -0700 | [diff] [blame] | 334 | static size_t get_base64_encoded_size(size_t raw_length) { |
| 335 | static const uint8_t tail_xtra[3] = {0, 2, 3}; |
| 336 | return raw_length / 3 * 4 + tail_xtra[raw_length % 3]; |
| 337 | } |
| 338 | |
Craig Tiller | 0160de9 | 2016-11-18 08:46:46 -0800 | [diff] [blame] | 339 | size_t grpc_mdelem_get_size_in_hpack_table(grpc_mdelem elem) { |
| 340 | size_t overhead_and_key = 32 + GRPC_SLICE_LENGTH(GRPC_MDKEY(elem)); |
| 341 | size_t value_len = GRPC_SLICE_LENGTH(GRPC_MDVALUE(elem)); |
| 342 | if (grpc_is_binary_header(GRPC_MDKEY(elem))) { |
Craig Tiller | e52bbb1 | 2016-11-10 15:34:06 -0800 | [diff] [blame] | 343 | return overhead_and_key + get_base64_encoded_size(value_len); |
yang-g | cb7a802 | 2016-03-30 14:58:53 -0700 | [diff] [blame] | 344 | } else { |
Craig Tiller | e52bbb1 | 2016-11-10 15:34:06 -0800 | [diff] [blame] | 345 | return overhead_and_key + value_len; |
yang-g | cb7a802 | 2016-03-30 14:58:53 -0700 | [diff] [blame] | 346 | } |
| 347 | } |
| 348 | |
Craig Tiller | 0160de9 | 2016-11-18 08:46:46 -0800 | [diff] [blame] | 349 | grpc_mdelem grpc_mdelem_ref(grpc_mdelem gmd DEBUG_ARGS) { |
Craig Tiller | 9ecadce | 2016-11-18 14:52:25 -0800 | [diff] [blame^] | 350 | switch (GRPC_MDELEM_STORAGE(gmd)) { |
| 351 | case GRPC_MDELEM_STORAGE_EXTERNAL: |
| 352 | case GRPC_MDELEM_STORAGE_STATIC: |
| 353 | break; |
| 354 | case GRPC_MDELEM_STORAGE_INTERNED: { |
| 355 | interned_metadata *md = (interned_metadata *)GRPC_MDELEM_DATA(gmd); |
Craig Tiller | 1a65a23 | 2015-07-06 10:22:32 -0700 | [diff] [blame] | 356 | #ifdef GRPC_METADATA_REFCOUNT_DEBUG |
Craig Tiller | 9ecadce | 2016-11-18 14:52:25 -0800 | [diff] [blame^] | 357 | gpr_log(file, line, GPR_LOG_SEVERITY_DEBUG, |
| 358 | "ELM REF:%p:%zu->%zu: '%s' = '%s'", (void *)md, |
| 359 | gpr_atm_no_barrier_load(&md->refcnt), |
| 360 | gpr_atm_no_barrier_load(&md->refcnt) + 1, |
| 361 | grpc_mdstr_as_c_string((grpc_slice)md->key), |
| 362 | grpc_mdstr_as_c_string((grpc_slice)md->value)); |
Craig Tiller | 1a65a23 | 2015-07-06 10:22:32 -0700 | [diff] [blame] | 363 | #endif |
Craig Tiller | 9ecadce | 2016-11-18 14:52:25 -0800 | [diff] [blame^] | 364 | /* we can assume the ref count is >= 1 as the application is calling |
| 365 | this function - meaning that no adjustment to mdtab_free is necessary, |
| 366 | simplifying the logic here to be just an atomic increment */ |
| 367 | /* use C assert to have this removed in opt builds */ |
| 368 | GPR_ASSERT(gpr_atm_no_barrier_load(&md->refcnt) >= 1); |
| 369 | gpr_atm_no_barrier_fetch_add(&md->refcnt, 1); |
| 370 | break; |
| 371 | } |
| 372 | case GRPC_MDELEM_STORAGE_ALLOCATED: { |
| 373 | allocated_metadata *md = (allocated_metadata *)GRPC_MDELEM_DATA(gmd); |
| 374 | #ifdef GRPC_METADATA_REFCOUNT_DEBUG |
| 375 | gpr_log(file, line, GPR_LOG_SEVERITY_DEBUG, |
| 376 | "ELM REF:%p:%zu->%zu: '%s' = '%s'", (void *)md, |
| 377 | gpr_atm_no_barrier_load(&md->refcnt), |
| 378 | gpr_atm_no_barrier_load(&md->refcnt) + 1, |
| 379 | grpc_mdstr_as_c_string((grpc_slice)md->key), |
| 380 | grpc_mdstr_as_c_string((grpc_slice)md->value)); |
| 381 | #endif |
| 382 | /* we can assume the ref count is >= 1 as the application is calling |
| 383 | this function - meaning that no adjustment to mdtab_free is necessary, |
| 384 | simplifying the logic here to be just an atomic increment */ |
| 385 | /* use C assert to have this removed in opt builds */ |
| 386 | gpr_atm_no_barrier_fetch_add(&md->refcnt, 1); |
| 387 | break; |
| 388 | } |
| 389 | } |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 390 | return gmd; |
| 391 | } |
| 392 | |
Craig Tiller | 0160de9 | 2016-11-18 08:46:46 -0800 | [diff] [blame] | 393 | void grpc_mdelem_unref(grpc_exec_ctx *exec_ctx, grpc_mdelem gmd DEBUG_ARGS) { |
Craig Tiller | 9ecadce | 2016-11-18 14:52:25 -0800 | [diff] [blame^] | 394 | switch (GRPC_MDELEM_STORAGE(gmd)) { |
| 395 | case GRPC_MDELEM_STORAGE_EXTERNAL: |
| 396 | case GRPC_MDELEM_STORAGE_STATIC: |
| 397 | break; |
| 398 | case GRPC_MDELEM_STORAGE_INTERNED: { |
| 399 | interned_metadata *md = (interned_metadata *)GRPC_MDELEM_DATA(gmd); |
Craig Tiller | 1a65a23 | 2015-07-06 10:22:32 -0700 | [diff] [blame] | 400 | #ifdef GRPC_METADATA_REFCOUNT_DEBUG |
Craig Tiller | 9ecadce | 2016-11-18 14:52:25 -0800 | [diff] [blame^] | 401 | gpr_log(file, line, GPR_LOG_SEVERITY_DEBUG, |
| 402 | "ELM UNREF:%p:%zu->%zu: '%s' = '%s'", (void *)md, |
| 403 | gpr_atm_no_barrier_load(&md->refcnt), |
| 404 | gpr_atm_no_barrier_load(&md->refcnt) - 1, |
| 405 | grpc_mdstr_as_c_string((grpc_slice)md->key), |
| 406 | grpc_mdstr_as_c_string((grpc_slice)md->value)); |
Craig Tiller | 1a65a23 | 2015-07-06 10:22:32 -0700 | [diff] [blame] | 407 | #endif |
Craig Tiller | 9ecadce | 2016-11-18 14:52:25 -0800 | [diff] [blame^] | 408 | uint32_t hash = GRPC_MDSTR_KV_HASH(grpc_slice_hash(md->key), |
| 409 | grpc_slice_hash(md->value)); |
| 410 | const gpr_atm prev_refcount = gpr_atm_full_fetch_add(&md->refcnt, -1); |
| 411 | GPR_ASSERT(prev_refcount >= 1); |
| 412 | if (1 == prev_refcount) { |
| 413 | /* once the refcount hits zero, some other thread can come along and |
| 414 | free md at any time: it's unsafe from this point on to access it */ |
| 415 | mdtab_shard *shard = &g_shards[SHARD_IDX(hash)]; |
| 416 | gpr_atm_no_barrier_fetch_add(&shard->free_estimate, 1); |
| 417 | } |
| 418 | break; |
| 419 | } |
| 420 | case GRPC_MDELEM_STORAGE_ALLOCATED: { |
| 421 | allocated_metadata *md = (allocated_metadata *)GRPC_MDELEM_DATA(gmd); |
| 422 | #ifdef GRPC_METADATA_REFCOUNT_DEBUG |
| 423 | gpr_log(file, line, GPR_LOG_SEVERITY_DEBUG, |
| 424 | "ELM UNREF:%p:%zu->%zu: '%s' = '%s'", (void *)md, |
| 425 | gpr_atm_no_barrier_load(&md->refcnt), |
| 426 | gpr_atm_no_barrier_load(&md->refcnt) - 1, |
| 427 | grpc_mdstr_as_c_string((grpc_slice)md->key), |
| 428 | grpc_mdstr_as_c_string((grpc_slice)md->value)); |
| 429 | #endif |
| 430 | const gpr_atm prev_refcount = gpr_atm_full_fetch_add(&md->refcnt, -1); |
| 431 | GPR_ASSERT(prev_refcount >= 1); |
| 432 | if (1 == prev_refcount) { |
| 433 | grpc_slice_unref_internal(exec_ctx, md->key); |
| 434 | grpc_slice_unref_internal(exec_ctx, md->value); |
| 435 | gpr_free(md); |
| 436 | } |
| 437 | break; |
| 438 | } |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 439 | } |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 440 | } |
| 441 | |
Craig Tiller | 0160de9 | 2016-11-18 08:46:46 -0800 | [diff] [blame] | 442 | void *grpc_mdelem_get_user_data(grpc_mdelem md, void (*destroy_func)(void *)) { |
Craig Tiller | 9ecadce | 2016-11-18 14:52:25 -0800 | [diff] [blame^] | 443 | switch (GRPC_MDELEM_STORAGE(md)) { |
| 444 | case GRPC_MDELEM_STORAGE_EXTERNAL: |
| 445 | case GRPC_MDELEM_STORAGE_ALLOCATED: |
| 446 | return NULL; |
| 447 | case GRPC_MDELEM_STORAGE_STATIC: |
| 448 | return (void *)grpc_static_mdelem_user_data[GRPC_MDELEM_DATA(md) - |
| 449 | grpc_static_mdelem_table]; |
| 450 | case GRPC_MDELEM_STORAGE_INTERNED: { |
| 451 | interned_metadata *im = (interned_metadata *)GRPC_MDELEM_DATA(md); |
| 452 | void *result; |
| 453 | if (gpr_atm_acq_load(&im->destroy_user_data) == (gpr_atm)destroy_func) { |
| 454 | return (void *)gpr_atm_no_barrier_load(&im->user_data); |
| 455 | } else { |
| 456 | return NULL; |
| 457 | } |
| 458 | return result; |
| 459 | } |
Craig Tiller | b2b4261 | 2015-11-20 12:02:17 -0800 | [diff] [blame] | 460 | } |
Craig Tiller | 9ecadce | 2016-11-18 14:52:25 -0800 | [diff] [blame^] | 461 | GPR_UNREACHABLE_CODE(return NULL); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 462 | } |
| 463 | |
Craig Tiller | 0160de9 | 2016-11-18 08:46:46 -0800 | [diff] [blame] | 464 | void *grpc_mdelem_set_user_data(grpc_mdelem md, void (*destroy_func)(void *), |
Craig Tiller | 738e6db | 2016-11-15 09:29:44 -0800 | [diff] [blame] | 465 | void *user_data) { |
Craig Tiller | 9ecadce | 2016-11-18 14:52:25 -0800 | [diff] [blame^] | 466 | switch (GRPC_MDELEM_STORAGE(md)) { |
| 467 | case GRPC_MDELEM_STORAGE_EXTERNAL: |
| 468 | case GRPC_MDELEM_STORAGE_ALLOCATED: |
Craig Tiller | 8390153 | 2015-07-10 14:02:45 -0700 | [diff] [blame] | 469 | destroy_func(user_data); |
Craig Tiller | 9ecadce | 2016-11-18 14:52:25 -0800 | [diff] [blame^] | 470 | return NULL; |
| 471 | case GRPC_MDELEM_STORAGE_STATIC: |
| 472 | destroy_func(user_data); |
| 473 | return (void *)grpc_static_mdelem_user_data[GRPC_MDELEM_DATA(md) - |
| 474 | grpc_static_mdelem_table]; |
| 475 | case GRPC_MDELEM_STORAGE_INTERNED: { |
| 476 | interned_metadata *im = (interned_metadata *)GRPC_MDELEM_DATA(md); |
| 477 | GPR_ASSERT(!is_mdelem_static(md)); |
| 478 | GPR_ASSERT((user_data == NULL) == (destroy_func == NULL)); |
| 479 | gpr_mu_lock(&im->mu_user_data); |
| 480 | if (gpr_atm_no_barrier_load(&im->destroy_user_data)) { |
| 481 | /* user data can only be set once */ |
| 482 | gpr_mu_unlock(&im->mu_user_data); |
| 483 | if (destroy_func != NULL) { |
| 484 | destroy_func(user_data); |
| 485 | } |
| 486 | return (void *)gpr_atm_no_barrier_load(&im->user_data); |
| 487 | } |
| 488 | gpr_atm_no_barrier_store(&im->user_data, (gpr_atm)user_data); |
| 489 | gpr_atm_rel_store(&im->destroy_user_data, (gpr_atm)destroy_func); |
| 490 | gpr_mu_unlock(&im->mu_user_data); |
| 491 | return user_data; |
Craig Tiller | 8390153 | 2015-07-10 14:02:45 -0700 | [diff] [blame] | 492 | } |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 493 | } |
Craig Tiller | 9ecadce | 2016-11-18 14:52:25 -0800 | [diff] [blame^] | 494 | GPR_UNREACHABLE_CODE(return NULL); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 495 | } |
Craig Tiller | 0160de9 | 2016-11-18 08:46:46 -0800 | [diff] [blame] | 496 | |
| 497 | bool grpc_mdelem_eq(grpc_mdelem a, grpc_mdelem b) { |
| 498 | if (a.payload == b.payload) return true; |
| 499 | return 0 == grpc_slice_cmp(GRPC_MDKEY(a), GRPC_MDKEY(b)) && |
| 500 | 0 == grpc_slice_cmp(GRPC_MDVALUE(a), GRPC_MDVALUE(b)); |
| 501 | } |