Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 1 | /* |
| 2 | * |
Jan Tattermusch | 7897ae9 | 2017-06-07 22:57:36 +0200 | [diff] [blame] | 3 | * Copyright 2015 gRPC authors. |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 4 | * |
Jan Tattermusch | 7897ae9 | 2017-06-07 22:57:36 +0200 | [diff] [blame] | 5 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 6 | * you may not use this file except in compliance with the License. |
| 7 | * You may obtain a copy of the License at |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 8 | * |
Jan Tattermusch | 7897ae9 | 2017-06-07 22:57:36 +0200 | [diff] [blame] | 9 | * http://www.apache.org/licenses/LICENSE-2.0 |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 10 | * |
Jan Tattermusch | 7897ae9 | 2017-06-07 22:57:36 +0200 | [diff] [blame] | 11 | * Unless required by applicable law or agreed to in writing, software |
| 12 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 13 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 14 | * See the License for the specific language governing permissions and |
| 15 | * limitations under the License. |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 16 | * |
| 17 | */ |
| 18 | |
Craig Tiller | 9533d04 | 2016-03-25 17:11:06 -0700 | [diff] [blame] | 19 | #include "src/core/lib/transport/metadata.h" |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 20 | |
Craig Tiller | 9fa41b9 | 2015-04-10 15:08:03 -0700 | [diff] [blame] | 21 | #include <assert.h> |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 22 | #include <stddef.h> |
| 23 | #include <string.h> |
| 24 | |
Craig Tiller | ebdef9d | 2015-11-19 17:09:49 -0800 | [diff] [blame] | 25 | #include <grpc/compression.h> |
yang-g | cb7a802 | 2016-03-30 14:58:53 -0700 | [diff] [blame] | 26 | #include <grpc/grpc.h> |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 27 | #include <grpc/support/alloc.h> |
Craig Tiller | 9fa41b9 | 2015-04-10 15:08:03 -0700 | [diff] [blame] | 28 | #include <grpc/support/atm.h> |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 29 | #include <grpc/support/log.h> |
Craig Tiller | ebdef9d | 2015-11-19 17:09:49 -0800 | [diff] [blame] | 30 | #include <grpc/support/string_util.h> |
Craig Tiller | 9d35a1f | 2015-11-02 14:16:12 -0800 | [diff] [blame] | 31 | #include <grpc/support/time.h> |
Craig Tiller | 0cb803d | 2016-03-02 22:17:24 -0800 | [diff] [blame] | 32 | |
Craig Tiller | 9533d04 | 2016-03-25 17:11:06 -0700 | [diff] [blame] | 33 | #include "src/core/lib/iomgr/iomgr_internal.h" |
| 34 | #include "src/core/lib/profiling/timers.h" |
Craig Tiller | a59c16c | 2016-10-31 07:25:01 -0700 | [diff] [blame] | 35 | #include "src/core/lib/slice/slice_internal.h" |
Craig Tiller | 7c70b6c | 2017-01-23 07:48:42 -0800 | [diff] [blame] | 36 | #include "src/core/lib/slice/slice_string_helpers.h" |
Craig Tiller | 9533d04 | 2016-03-25 17:11:06 -0700 | [diff] [blame] | 37 | #include "src/core/lib/support/murmur_hash.h" |
| 38 | #include "src/core/lib/support/string.h" |
Craig Tiller | 9533d04 | 2016-03-25 17:11:06 -0700 | [diff] [blame] | 39 | #include "src/core/lib/transport/static_metadata.h" |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 40 | |
Craig Tiller | 70b080d | 2015-11-19 08:04:48 -0800 | [diff] [blame] | 41 | /* There are two kinds of mdelem and mdstr instances. |
| 42 | * Static instances are declared in static_metadata.{h,c} and |
| 43 | * are initialized by grpc_mdctx_global_init(). |
| 44 | * Dynamic instances are stored in hash tables on grpc_mdctx, and are backed |
| 45 | * by internal_string and internal_element structures. |
| 46 | * Internal helper functions here-in (is_mdstr_static, is_mdelem_static) are |
| 47 | * used to determine which kind of element a pointer refers to. |
| 48 | */ |
| 49 | |
ncteisen | 4b58405 | 2017-06-08 16:44:38 -0700 | [diff] [blame] | 50 | #ifndef NDEBUG |
| 51 | grpc_tracer_flag grpc_trace_metadata = GRPC_TRACER_INITIALIZER(false); |
Craig Tiller | 1a65a23 | 2015-07-06 10:22:32 -0700 | [diff] [blame] | 52 | #define DEBUG_ARGS , const char *file, int line |
| 53 | #define FWD_DEBUG_ARGS , file, line |
Craig Tiller | b2b4261 | 2015-11-20 12:02:17 -0800 | [diff] [blame] | 54 | #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] | 55 | #else |
| 56 | #define DEBUG_ARGS |
| 57 | #define FWD_DEBUG_ARGS |
Craig Tiller | b2b4261 | 2015-11-20 12:02:17 -0800 | [diff] [blame] | 58 | #define REF_MD_LOCKED(shard, s) ref_md_locked((shard), (s)) |
Craig Tiller | 1a65a23 | 2015-07-06 10:22:32 -0700 | [diff] [blame] | 59 | #endif |
| 60 | |
Craig Tiller | 7c70b6c | 2017-01-23 07:48:42 -0800 | [diff] [blame] | 61 | #define INITIAL_SHARD_CAPACITY 8 |
| 62 | #define LOG2_SHARD_COUNT 4 |
| 63 | #define SHARD_COUNT ((size_t)(1 << LOG2_SHARD_COUNT)) |
| 64 | |
| 65 | #define TABLE_IDX(hash, capacity) (((hash) >> (LOG2_SHARD_COUNT)) % (capacity)) |
| 66 | #define SHARD_IDX(hash) ((hash) & ((1 << (LOG2_SHARD_COUNT)) - 1)) |
Craig Tiller | b2b4261 | 2015-11-20 12:02:17 -0800 | [diff] [blame] | 67 | |
Craig Tiller | 8344daa | 2015-10-09 18:10:57 -0700 | [diff] [blame] | 68 | typedef void (*destroy_user_data_func)(void *user_data); |
| 69 | |
Craig Tiller | 7c70b6c | 2017-01-23 07:48:42 -0800 | [diff] [blame] | 70 | /* Shadow structure for grpc_mdelem_data for interned elements */ |
| 71 | typedef struct interned_metadata { |
| 72 | /* must be byte compatible with grpc_mdelem_data */ |
| 73 | grpc_slice key; |
| 74 | grpc_slice value; |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 75 | |
Craig Tiller | b2b4261 | 2015-11-20 12:02:17 -0800 | [diff] [blame] | 76 | /* private only data */ |
Craig Tiller | 9fa41b9 | 2015-04-10 15:08:03 -0700 | [diff] [blame] | 77 | gpr_atm refcnt; |
| 78 | |
Craig Tiller | 8390153 | 2015-07-10 14:02:45 -0700 | [diff] [blame] | 79 | gpr_mu mu_user_data; |
Craig Tiller | 8344daa | 2015-10-09 18:10:57 -0700 | [diff] [blame] | 80 | gpr_atm destroy_user_data; |
| 81 | gpr_atm user_data; |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 82 | |
Craig Tiller | 7c70b6c | 2017-01-23 07:48:42 -0800 | [diff] [blame] | 83 | struct interned_metadata *bucket_next; |
| 84 | } interned_metadata; |
Craig Tiller | 9ecadce | 2016-11-18 14:52:25 -0800 | [diff] [blame] | 85 | |
Craig Tiller | 7c70b6c | 2017-01-23 07:48:42 -0800 | [diff] [blame] | 86 | /* Shadow structure for grpc_mdelem_data for allocated elements */ |
| 87 | typedef struct allocated_metadata { |
| 88 | /* must be byte compatible with grpc_mdelem_data */ |
| 89 | grpc_slice key; |
| 90 | grpc_slice value; |
| 91 | |
| 92 | /* private only data */ |
| 93 | gpr_atm refcnt; |
| 94 | } allocated_metadata; |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 95 | |
Craig Tiller | b2b4261 | 2015-11-20 12:02:17 -0800 | [diff] [blame] | 96 | typedef struct mdtab_shard { |
| 97 | gpr_mu mu; |
Craig Tiller | 7c70b6c | 2017-01-23 07:48:42 -0800 | [diff] [blame] | 98 | interned_metadata **elems; |
Craig Tiller | b2b4261 | 2015-11-20 12:02:17 -0800 | [diff] [blame] | 99 | size_t count; |
| 100 | size_t capacity; |
Craig Tiller | 8d8f9a8 | 2016-06-03 08:49:11 -0700 | [diff] [blame] | 101 | /** Estimate of the number of unreferenced mdelems in the hash table. |
| 102 | This will eventually converge to the exact number, but it's instantaneous |
| 103 | accuracy is not guaranteed */ |
| 104 | gpr_atm free_estimate; |
Craig Tiller | b2b4261 | 2015-11-20 12:02:17 -0800 | [diff] [blame] | 105 | } mdtab_shard; |
Craig Tiller | 0e72ede | 2015-11-19 07:48:53 -0800 | [diff] [blame] | 106 | |
Craig Tiller | 7c70b6c | 2017-01-23 07:48:42 -0800 | [diff] [blame] | 107 | static mdtab_shard g_shards[SHARD_COUNT]; |
Craig Tiller | b2b4261 | 2015-11-20 12:02:17 -0800 | [diff] [blame] | 108 | |
Craig Tiller | a59c16c | 2016-10-31 07:25:01 -0700 | [diff] [blame] | 109 | static void gc_mdtab(grpc_exec_ctx *exec_ctx, mdtab_shard *shard); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 110 | |
Craig Tiller | 0e72ede | 2015-11-19 07:48:53 -0800 | [diff] [blame] | 111 | void grpc_mdctx_global_init(void) { |
Craig Tiller | b2b4261 | 2015-11-20 12:02:17 -0800 | [diff] [blame] | 112 | /* initialize shards */ |
Craig Tiller | 7c70b6c | 2017-01-23 07:48:42 -0800 | [diff] [blame] | 113 | for (size_t i = 0; i < SHARD_COUNT; i++) { |
| 114 | mdtab_shard *shard = &g_shards[i]; |
Craig Tiller | b2b4261 | 2015-11-20 12:02:17 -0800 | [diff] [blame] | 115 | gpr_mu_init(&shard->mu); |
| 116 | shard->count = 0; |
Craig Tiller | 8d8f9a8 | 2016-06-03 08:49:11 -0700 | [diff] [blame] | 117 | gpr_atm_no_barrier_store(&shard->free_estimate, 0); |
Craig Tiller | 7c70b6c | 2017-01-23 07:48:42 -0800 | [diff] [blame] | 118 | shard->capacity = INITIAL_SHARD_CAPACITY; |
Craig Tiller | 6f41788 | 2017-02-16 14:09:39 -0800 | [diff] [blame] | 119 | shard->elems = gpr_zalloc(sizeof(*shard->elems) * shard->capacity); |
Craig Tiller | 0e72ede | 2015-11-19 07:48:53 -0800 | [diff] [blame] | 120 | } |
| 121 | } |
| 122 | |
Craig Tiller | a59c16c | 2016-10-31 07:25:01 -0700 | [diff] [blame] | 123 | void grpc_mdctx_global_shutdown(grpc_exec_ctx *exec_ctx) { |
Craig Tiller | 7c70b6c | 2017-01-23 07:48:42 -0800 | [diff] [blame] | 124 | for (size_t i = 0; i < SHARD_COUNT; i++) { |
| 125 | mdtab_shard *shard = &g_shards[i]; |
Craig Tiller | b2b4261 | 2015-11-20 12:02:17 -0800 | [diff] [blame] | 126 | gpr_mu_destroy(&shard->mu); |
Craig Tiller | a59c16c | 2016-10-31 07:25:01 -0700 | [diff] [blame] | 127 | gc_mdtab(exec_ctx, shard); |
Craig Tiller | 3407544 | 2015-11-23 16:16:54 -0800 | [diff] [blame] | 128 | /* TODO(ctiller): GPR_ASSERT(shard->count == 0); */ |
| 129 | if (shard->count != 0) { |
Yuchen Zeng | 64c0e8d | 2016-06-10 11:19:51 -0700 | [diff] [blame] | 130 | gpr_log(GPR_DEBUG, "WARNING: %" PRIuPTR " metadata elements were leaked", |
yang-g | d88e1d8 | 2015-12-02 13:23:33 -0800 | [diff] [blame] | 131 | shard->count); |
Craig Tiller | 0cb803d | 2016-03-02 22:17:24 -0800 | [diff] [blame] | 132 | if (grpc_iomgr_abort_on_leaks()) { |
| 133 | abort(); |
| 134 | } |
Craig Tiller | 3407544 | 2015-11-23 16:16:54 -0800 | [diff] [blame] | 135 | } |
Craig Tiller | b2b4261 | 2015-11-20 12:02:17 -0800 | [diff] [blame] | 136 | gpr_free(shard->elems); |
| 137 | } |
Craig Tiller | 0e72ede | 2015-11-19 07:48:53 -0800 | [diff] [blame] | 138 | } |
| 139 | |
Craig Tiller | 7c70b6c | 2017-01-23 07:48:42 -0800 | [diff] [blame] | 140 | static int is_mdelem_static(grpc_mdelem e) { |
| 141 | return GRPC_MDELEM_DATA(e) >= &grpc_static_mdelem_table[0] && |
| 142 | GRPC_MDELEM_DATA(e) < |
| 143 | &grpc_static_mdelem_table[GRPC_STATIC_MDELEM_COUNT]; |
Craig Tiller | 0e72ede | 2015-11-19 07:48:53 -0800 | [diff] [blame] | 144 | } |
| 145 | |
Craig Tiller | b2b4261 | 2015-11-20 12:02:17 -0800 | [diff] [blame] | 146 | static void ref_md_locked(mdtab_shard *shard, |
Craig Tiller | 7c70b6c | 2017-01-23 07:48:42 -0800 | [diff] [blame] | 147 | interned_metadata *md DEBUG_ARGS) { |
ncteisen | 4b58405 | 2017-06-08 16:44:38 -0700 | [diff] [blame] | 148 | #ifndef NDEBUG |
| 149 | if (GRPC_TRACER_ON(grpc_trace_metadata)) { |
| 150 | char *key_str = grpc_slice_to_c_string(md->key); |
| 151 | char *value_str = grpc_slice_to_c_string(md->value); |
| 152 | gpr_log(file, line, GPR_LOG_SEVERITY_DEBUG, |
ncteisen | 3ac64f8 | 2017-06-19 17:35:44 -0700 | [diff] [blame^] | 153 | "ELM REF:%p:%" PRIdPTR "->%" PRIdPTR ": '%s' = '%s'", (void *)md, |
ncteisen | 4b58405 | 2017-06-08 16:44:38 -0700 | [diff] [blame] | 154 | gpr_atm_no_barrier_load(&md->refcnt), |
| 155 | gpr_atm_no_barrier_load(&md->refcnt) + 1, key_str, value_str); |
| 156 | gpr_free(key_str); |
| 157 | gpr_free(value_str); |
| 158 | } |
Craig Tiller | 1a65a23 | 2015-07-06 10:22:32 -0700 | [diff] [blame] | 159 | #endif |
Craig Tiller | 8d8f9a8 | 2016-06-03 08:49:11 -0700 | [diff] [blame] | 160 | if (0 == gpr_atm_no_barrier_fetch_add(&md->refcnt, 1)) { |
| 161 | gpr_atm_no_barrier_fetch_add(&shard->free_estimate, -1); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 162 | } |
| 163 | } |
| 164 | |
Craig Tiller | a59c16c | 2016-10-31 07:25:01 -0700 | [diff] [blame] | 165 | static void gc_mdtab(grpc_exec_ctx *exec_ctx, mdtab_shard *shard) { |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 166 | size_t i; |
Craig Tiller | 7c70b6c | 2017-01-23 07:48:42 -0800 | [diff] [blame] | 167 | interned_metadata **prev_next; |
| 168 | interned_metadata *md, *next; |
Craig Tiller | 8d8f9a8 | 2016-06-03 08:49:11 -0700 | [diff] [blame] | 169 | gpr_atm num_freed = 0; |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 170 | |
Craig Tiller | 9d35a1f | 2015-11-02 14:16:12 -0800 | [diff] [blame] | 171 | GPR_TIMER_BEGIN("gc_mdtab", 0); |
Craig Tiller | b2b4261 | 2015-11-20 12:02:17 -0800 | [diff] [blame] | 172 | for (i = 0; i < shard->capacity; i++) { |
| 173 | prev_next = &shard->elems[i]; |
| 174 | for (md = shard->elems[i]; md; md = next) { |
Craig Tiller | 8344daa | 2015-10-09 18:10:57 -0700 | [diff] [blame] | 175 | void *user_data = (void *)gpr_atm_no_barrier_load(&md->user_data); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 176 | next = md->bucket_next; |
Craig Tiller | 9fa41b9 | 2015-04-10 15:08:03 -0700 | [diff] [blame] | 177 | if (gpr_atm_acq_load(&md->refcnt) == 0) { |
Craig Tiller | 7c70b6c | 2017-01-23 07:48:42 -0800 | [diff] [blame] | 178 | grpc_slice_unref_internal(exec_ctx, md->key); |
| 179 | grpc_slice_unref_internal(exec_ctx, md->value); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 180 | if (md->user_data) { |
Craig Tiller | 8344daa | 2015-10-09 18:10:57 -0700 | [diff] [blame] | 181 | ((destroy_user_data_func)gpr_atm_no_barrier_load( |
| 182 | &md->destroy_user_data))(user_data); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 183 | } |
| 184 | gpr_free(md); |
| 185 | *prev_next = next; |
Craig Tiller | 8d8f9a8 | 2016-06-03 08:49:11 -0700 | [diff] [blame] | 186 | num_freed++; |
Craig Tiller | b2b4261 | 2015-11-20 12:02:17 -0800 | [diff] [blame] | 187 | shard->count--; |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 188 | } else { |
| 189 | prev_next = &md->bucket_next; |
| 190 | } |
| 191 | } |
| 192 | } |
Craig Tiller | 8d8f9a8 | 2016-06-03 08:49:11 -0700 | [diff] [blame] | 193 | gpr_atm_no_barrier_fetch_add(&shard->free_estimate, -num_freed); |
Craig Tiller | 9d35a1f | 2015-11-02 14:16:12 -0800 | [diff] [blame] | 194 | GPR_TIMER_END("gc_mdtab", 0); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 195 | } |
| 196 | |
Craig Tiller | b2b4261 | 2015-11-20 12:02:17 -0800 | [diff] [blame] | 197 | static void grow_mdtab(mdtab_shard *shard) { |
| 198 | size_t capacity = shard->capacity * 2; |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 199 | size_t i; |
Craig Tiller | 7c70b6c | 2017-01-23 07:48:42 -0800 | [diff] [blame] | 200 | interned_metadata **mdtab; |
| 201 | interned_metadata *md, *next; |
Craig Tiller | 7536af0 | 2015-12-22 13:49:30 -0800 | [diff] [blame] | 202 | uint32_t hash; |
Craig Tiller | 9d35a1f | 2015-11-02 14:16:12 -0800 | [diff] [blame] | 203 | |
| 204 | GPR_TIMER_BEGIN("grow_mdtab", 0); |
| 205 | |
Craig Tiller | 6f41788 | 2017-02-16 14:09:39 -0800 | [diff] [blame] | 206 | mdtab = gpr_zalloc(sizeof(interned_metadata *) * capacity); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 207 | |
Craig Tiller | b2b4261 | 2015-11-20 12:02:17 -0800 | [diff] [blame] | 208 | for (i = 0; i < shard->capacity; i++) { |
| 209 | for (md = shard->elems[i]; md; md = next) { |
| 210 | size_t idx; |
Craig Tiller | 7c70b6c | 2017-01-23 07:48:42 -0800 | [diff] [blame] | 211 | hash = GRPC_MDSTR_KV_HASH(grpc_slice_hash(md->key), |
| 212 | grpc_slice_hash(md->value)); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 213 | next = md->bucket_next; |
Craig Tiller | 7c70b6c | 2017-01-23 07:48:42 -0800 | [diff] [blame] | 214 | idx = TABLE_IDX(hash, capacity); |
Craig Tiller | b2b4261 | 2015-11-20 12:02:17 -0800 | [diff] [blame] | 215 | md->bucket_next = mdtab[idx]; |
| 216 | mdtab[idx] = md; |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 217 | } |
| 218 | } |
| 219 | |
Craig Tiller | b2b4261 | 2015-11-20 12:02:17 -0800 | [diff] [blame] | 220 | gpr_free(shard->elems); |
| 221 | shard->elems = mdtab; |
| 222 | shard->capacity = capacity; |
Craig Tiller | 9d35a1f | 2015-11-02 14:16:12 -0800 | [diff] [blame] | 223 | |
| 224 | GPR_TIMER_END("grow_mdtab", 0); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 225 | } |
| 226 | |
Craig Tiller | a59c16c | 2016-10-31 07:25:01 -0700 | [diff] [blame] | 227 | static void rehash_mdtab(grpc_exec_ctx *exec_ctx, mdtab_shard *shard) { |
Craig Tiller | 139098c | 2016-06-06 08:10:08 -0700 | [diff] [blame] | 228 | if (gpr_atm_no_barrier_load(&shard->free_estimate) > |
| 229 | (gpr_atm)(shard->capacity / 4)) { |
Craig Tiller | a59c16c | 2016-10-31 07:25:01 -0700 | [diff] [blame] | 230 | gc_mdtab(exec_ctx, shard); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 231 | } else { |
Craig Tiller | b2b4261 | 2015-11-20 12:02:17 -0800 | [diff] [blame] | 232 | grow_mdtab(shard); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 233 | } |
| 234 | } |
| 235 | |
Craig Tiller | 7c70b6c | 2017-01-23 07:48:42 -0800 | [diff] [blame] | 236 | grpc_mdelem grpc_mdelem_create( |
| 237 | grpc_exec_ctx *exec_ctx, grpc_slice key, grpc_slice value, |
| 238 | grpc_mdelem_data *compatible_external_backing_store) { |
| 239 | if (!grpc_slice_is_interned(key) || !grpc_slice_is_interned(value)) { |
| 240 | if (compatible_external_backing_store != NULL) { |
| 241 | return GRPC_MAKE_MDELEM(compatible_external_backing_store, |
| 242 | GRPC_MDELEM_STORAGE_EXTERNAL); |
| 243 | } |
| 244 | |
| 245 | allocated_metadata *allocated = gpr_malloc(sizeof(*allocated)); |
| 246 | allocated->key = grpc_slice_ref_internal(key); |
| 247 | allocated->value = grpc_slice_ref_internal(value); |
| 248 | gpr_atm_rel_store(&allocated->refcnt, 1); |
ncteisen | 4b58405 | 2017-06-08 16:44:38 -0700 | [diff] [blame] | 249 | #ifndef NDEBUG |
| 250 | if (GRPC_TRACER_ON(grpc_trace_metadata)) { |
| 251 | char *key_str = grpc_slice_to_c_string(allocated->key); |
| 252 | char *value_str = grpc_slice_to_c_string(allocated->value); |
ncteisen | 3ac64f8 | 2017-06-19 17:35:44 -0700 | [diff] [blame^] | 253 | gpr_log(GPR_DEBUG, "ELM ALLOC:%p:%" PRIdPTR ": '%s' = '%s'", |
| 254 | (void *)allocated, gpr_atm_no_barrier_load(&allocated->refcnt), |
| 255 | key_str, value_str); |
ncteisen | 4b58405 | 2017-06-08 16:44:38 -0700 | [diff] [blame] | 256 | gpr_free(key_str); |
| 257 | gpr_free(value_str); |
| 258 | } |
Craig Tiller | 7c70b6c | 2017-01-23 07:48:42 -0800 | [diff] [blame] | 259 | #endif |
| 260 | return GRPC_MAKE_MDELEM(allocated, GRPC_MDELEM_STORAGE_ALLOCATED); |
| 261 | } |
| 262 | |
| 263 | if (GRPC_IS_STATIC_METADATA_STRING(key) && |
| 264 | GRPC_IS_STATIC_METADATA_STRING(value)) { |
| 265 | grpc_mdelem static_elem = grpc_static_mdelem_for_static_strings( |
| 266 | GRPC_STATIC_METADATA_INDEX(key), GRPC_STATIC_METADATA_INDEX(value)); |
| 267 | if (!GRPC_MDISNULL(static_elem)) { |
| 268 | return static_elem; |
| 269 | } |
| 270 | } |
| 271 | |
| 272 | uint32_t hash = |
| 273 | GRPC_MDSTR_KV_HASH(grpc_slice_hash(key), grpc_slice_hash(value)); |
| 274 | interned_metadata *md; |
| 275 | mdtab_shard *shard = &g_shards[SHARD_IDX(hash)]; |
Craig Tiller | b2b4261 | 2015-11-20 12:02:17 -0800 | [diff] [blame] | 276 | size_t idx; |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 277 | |
Craig Tiller | 9d35a1f | 2015-11-02 14:16:12 -0800 | [diff] [blame] | 278 | GPR_TIMER_BEGIN("grpc_mdelem_from_metadata_strings", 0); |
| 279 | |
Craig Tiller | b2b4261 | 2015-11-20 12:02:17 -0800 | [diff] [blame] | 280 | gpr_mu_lock(&shard->mu); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 281 | |
Craig Tiller | 7c70b6c | 2017-01-23 07:48:42 -0800 | [diff] [blame] | 282 | idx = TABLE_IDX(hash, shard->capacity); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 283 | /* search for an existing pair */ |
Craig Tiller | b2b4261 | 2015-11-20 12:02:17 -0800 | [diff] [blame] | 284 | for (md = shard->elems[idx]; md; md = md->bucket_next) { |
Craig Tiller | 7c70b6c | 2017-01-23 07:48:42 -0800 | [diff] [blame] | 285 | if (grpc_slice_eq(key, md->key) && grpc_slice_eq(value, md->value)) { |
Craig Tiller | b2b4261 | 2015-11-20 12:02:17 -0800 | [diff] [blame] | 286 | REF_MD_LOCKED(shard, md); |
Craig Tiller | b2b4261 | 2015-11-20 12:02:17 -0800 | [diff] [blame] | 287 | gpr_mu_unlock(&shard->mu); |
Craig Tiller | 9d35a1f | 2015-11-02 14:16:12 -0800 | [diff] [blame] | 288 | GPR_TIMER_END("grpc_mdelem_from_metadata_strings", 0); |
Craig Tiller | 7c70b6c | 2017-01-23 07:48:42 -0800 | [diff] [blame] | 289 | return GRPC_MAKE_MDELEM(md, GRPC_MDELEM_STORAGE_INTERNED); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 290 | } |
| 291 | } |
| 292 | |
| 293 | /* not found: create a new pair */ |
Craig Tiller | 7c70b6c | 2017-01-23 07:48:42 -0800 | [diff] [blame] | 294 | md = gpr_malloc(sizeof(interned_metadata)); |
Craig Tiller | 8d8f9a8 | 2016-06-03 08:49:11 -0700 | [diff] [blame] | 295 | gpr_atm_rel_store(&md->refcnt, 1); |
Craig Tiller | 7c70b6c | 2017-01-23 07:48:42 -0800 | [diff] [blame] | 296 | md->key = grpc_slice_ref_internal(key); |
| 297 | md->value = grpc_slice_ref_internal(value); |
Craig Tiller | 8344daa | 2015-10-09 18:10:57 -0700 | [diff] [blame] | 298 | md->user_data = 0; |
| 299 | md->destroy_user_data = 0; |
Craig Tiller | b2b4261 | 2015-11-20 12:02:17 -0800 | [diff] [blame] | 300 | md->bucket_next = shard->elems[idx]; |
| 301 | shard->elems[idx] = md; |
Craig Tiller | 8390153 | 2015-07-10 14:02:45 -0700 | [diff] [blame] | 302 | gpr_mu_init(&md->mu_user_data); |
ncteisen | 4b58405 | 2017-06-08 16:44:38 -0700 | [diff] [blame] | 303 | #ifndef NDEBUG |
| 304 | if (GRPC_TRACER_ON(grpc_trace_metadata)) { |
| 305 | char *key_str = grpc_slice_to_c_string(md->key); |
| 306 | char *value_str = grpc_slice_to_c_string(md->value); |
ncteisen | 3ac64f8 | 2017-06-19 17:35:44 -0700 | [diff] [blame^] | 307 | gpr_log(GPR_DEBUG, "ELM NEW:%p:%" PRIdPTR ": '%s' = '%s'", (void *)md, |
ncteisen | 4b58405 | 2017-06-08 16:44:38 -0700 | [diff] [blame] | 308 | gpr_atm_no_barrier_load(&md->refcnt), key_str, value_str); |
| 309 | gpr_free(key_str); |
| 310 | gpr_free(value_str); |
| 311 | } |
Craig Tiller | 1a65a23 | 2015-07-06 10:22:32 -0700 | [diff] [blame] | 312 | #endif |
Craig Tiller | b2b4261 | 2015-11-20 12:02:17 -0800 | [diff] [blame] | 313 | shard->count++; |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 314 | |
Craig Tiller | b2b4261 | 2015-11-20 12:02:17 -0800 | [diff] [blame] | 315 | if (shard->count > shard->capacity * 2) { |
Craig Tiller | a59c16c | 2016-10-31 07:25:01 -0700 | [diff] [blame] | 316 | rehash_mdtab(exec_ctx, shard); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 317 | } |
| 318 | |
Craig Tiller | b2b4261 | 2015-11-20 12:02:17 -0800 | [diff] [blame] | 319 | gpr_mu_unlock(&shard->mu); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 320 | |
Craig Tiller | 9d35a1f | 2015-11-02 14:16:12 -0800 | [diff] [blame] | 321 | GPR_TIMER_END("grpc_mdelem_from_metadata_strings", 0); |
| 322 | |
Craig Tiller | 7c70b6c | 2017-01-23 07:48:42 -0800 | [diff] [blame] | 323 | return GRPC_MAKE_MDELEM(md, GRPC_MDELEM_STORAGE_INTERNED); |
Craig Tiller | 9ecadce | 2016-11-18 14:52:25 -0800 | [diff] [blame] | 324 | } |
| 325 | |
Craig Tiller | 7c70b6c | 2017-01-23 07:48:42 -0800 | [diff] [blame] | 326 | grpc_mdelem grpc_mdelem_from_slices(grpc_exec_ctx *exec_ctx, grpc_slice key, |
| 327 | grpc_slice value) { |
| 328 | grpc_mdelem out = grpc_mdelem_create(exec_ctx, key, value, NULL); |
| 329 | grpc_slice_unref_internal(exec_ctx, key); |
| 330 | grpc_slice_unref_internal(exec_ctx, value); |
| 331 | return out; |
Craig Tiller | 9ecadce | 2016-11-18 14:52:25 -0800 | [diff] [blame] | 332 | } |
| 333 | |
Craig Tiller | 7c70b6c | 2017-01-23 07:48:42 -0800 | [diff] [blame] | 334 | grpc_mdelem grpc_mdelem_from_grpc_metadata(grpc_exec_ctx *exec_ctx, |
| 335 | grpc_metadata *metadata) { |
| 336 | bool changed = false; |
| 337 | grpc_slice key_slice = |
| 338 | grpc_slice_maybe_static_intern(metadata->key, &changed); |
| 339 | grpc_slice value_slice = |
| 340 | grpc_slice_maybe_static_intern(metadata->value, &changed); |
| 341 | return grpc_mdelem_create(exec_ctx, key_slice, value_slice, |
| 342 | changed ? NULL : (grpc_mdelem_data *)metadata); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 343 | } |
| 344 | |
yang-g | 24ba7c1 | 2016-03-30 16:19:43 -0700 | [diff] [blame] | 345 | static size_t get_base64_encoded_size(size_t raw_length) { |
| 346 | static const uint8_t tail_xtra[3] = {0, 2, 3}; |
| 347 | return raw_length / 3 * 4 + tail_xtra[raw_length % 3]; |
| 348 | } |
| 349 | |
Craig Tiller | 7c70b6c | 2017-01-23 07:48:42 -0800 | [diff] [blame] | 350 | size_t grpc_mdelem_get_size_in_hpack_table(grpc_mdelem elem) { |
| 351 | size_t overhead_and_key = 32 + GRPC_SLICE_LENGTH(GRPC_MDKEY(elem)); |
| 352 | size_t value_len = GRPC_SLICE_LENGTH(GRPC_MDVALUE(elem)); |
| 353 | if (grpc_is_binary_header(GRPC_MDKEY(elem))) { |
| 354 | return overhead_and_key + get_base64_encoded_size(value_len); |
yang-g | cb7a802 | 2016-03-30 14:58:53 -0700 | [diff] [blame] | 355 | } else { |
Craig Tiller | 7c70b6c | 2017-01-23 07:48:42 -0800 | [diff] [blame] | 356 | return overhead_and_key + value_len; |
yang-g | cb7a802 | 2016-03-30 14:58:53 -0700 | [diff] [blame] | 357 | } |
| 358 | } |
| 359 | |
Craig Tiller | 7c70b6c | 2017-01-23 07:48:42 -0800 | [diff] [blame] | 360 | grpc_mdelem grpc_mdelem_ref(grpc_mdelem gmd DEBUG_ARGS) { |
| 361 | switch (GRPC_MDELEM_STORAGE(gmd)) { |
| 362 | case GRPC_MDELEM_STORAGE_EXTERNAL: |
| 363 | case GRPC_MDELEM_STORAGE_STATIC: |
| 364 | break; |
| 365 | case GRPC_MDELEM_STORAGE_INTERNED: { |
| 366 | interned_metadata *md = (interned_metadata *)GRPC_MDELEM_DATA(gmd); |
ncteisen | 4b58405 | 2017-06-08 16:44:38 -0700 | [diff] [blame] | 367 | #ifndef NDEBUG |
| 368 | if (GRPC_TRACER_ON(grpc_trace_metadata)) { |
| 369 | char *key_str = grpc_slice_to_c_string(md->key); |
| 370 | char *value_str = grpc_slice_to_c_string(md->value); |
| 371 | gpr_log(file, line, GPR_LOG_SEVERITY_DEBUG, |
ncteisen | 3ac64f8 | 2017-06-19 17:35:44 -0700 | [diff] [blame^] | 372 | "ELM REF:%p:%" PRIdPTR "->%" PRIdPTR ": '%s' = '%s'", |
| 373 | (void *)md, gpr_atm_no_barrier_load(&md->refcnt), |
ncteisen | 4b58405 | 2017-06-08 16:44:38 -0700 | [diff] [blame] | 374 | gpr_atm_no_barrier_load(&md->refcnt) + 1, key_str, value_str); |
| 375 | gpr_free(key_str); |
| 376 | gpr_free(value_str); |
| 377 | } |
Craig Tiller | 1a65a23 | 2015-07-06 10:22:32 -0700 | [diff] [blame] | 378 | #endif |
Craig Tiller | 7c70b6c | 2017-01-23 07:48:42 -0800 | [diff] [blame] | 379 | /* we can assume the ref count is >= 1 as the application is calling |
| 380 | this function - meaning that no adjustment to mdtab_free is necessary, |
| 381 | simplifying the logic here to be just an atomic increment */ |
| 382 | /* use C assert to have this removed in opt builds */ |
| 383 | GPR_ASSERT(gpr_atm_no_barrier_load(&md->refcnt) >= 1); |
| 384 | gpr_atm_no_barrier_fetch_add(&md->refcnt, 1); |
| 385 | break; |
| 386 | } |
| 387 | case GRPC_MDELEM_STORAGE_ALLOCATED: { |
| 388 | allocated_metadata *md = (allocated_metadata *)GRPC_MDELEM_DATA(gmd); |
ncteisen | 4b58405 | 2017-06-08 16:44:38 -0700 | [diff] [blame] | 389 | #ifndef NDEBUG |
| 390 | if (GRPC_TRACER_ON(grpc_trace_metadata)) { |
| 391 | char *key_str = grpc_slice_to_c_string(md->key); |
| 392 | char *value_str = grpc_slice_to_c_string(md->value); |
| 393 | gpr_log(file, line, GPR_LOG_SEVERITY_DEBUG, |
ncteisen | 3ac64f8 | 2017-06-19 17:35:44 -0700 | [diff] [blame^] | 394 | "ELM REF:%p:%" PRIdPTR "->%" PRIdPTR ": '%s' = '%s'", |
| 395 | (void *)md, gpr_atm_no_barrier_load(&md->refcnt), |
ncteisen | 4b58405 | 2017-06-08 16:44:38 -0700 | [diff] [blame] | 396 | gpr_atm_no_barrier_load(&md->refcnt) + 1, key_str, value_str); |
| 397 | gpr_free(key_str); |
| 398 | gpr_free(value_str); |
ncteisen | d39010e | 2017-06-08 17:08:07 -0700 | [diff] [blame] | 399 | } |
Craig Tiller | 7c70b6c | 2017-01-23 07:48:42 -0800 | [diff] [blame] | 400 | #endif |
| 401 | /* we can assume the ref count is >= 1 as the application is calling |
| 402 | this function - meaning that no adjustment to mdtab_free is necessary, |
| 403 | simplifying the logic here to be just an atomic increment */ |
| 404 | /* use C assert to have this removed in opt builds */ |
| 405 | gpr_atm_no_barrier_fetch_add(&md->refcnt, 1); |
| 406 | break; |
| 407 | } |
| 408 | } |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 409 | return gmd; |
| 410 | } |
| 411 | |
Craig Tiller | 7c70b6c | 2017-01-23 07:48:42 -0800 | [diff] [blame] | 412 | void grpc_mdelem_unref(grpc_exec_ctx *exec_ctx, grpc_mdelem gmd DEBUG_ARGS) { |
| 413 | switch (GRPC_MDELEM_STORAGE(gmd)) { |
| 414 | case GRPC_MDELEM_STORAGE_EXTERNAL: |
| 415 | case GRPC_MDELEM_STORAGE_STATIC: |
| 416 | break; |
| 417 | case GRPC_MDELEM_STORAGE_INTERNED: { |
| 418 | interned_metadata *md = (interned_metadata *)GRPC_MDELEM_DATA(gmd); |
ncteisen | 4b58405 | 2017-06-08 16:44:38 -0700 | [diff] [blame] | 419 | #ifndef NDEBUG |
| 420 | if (GRPC_TRACER_ON(grpc_trace_metadata)) { |
| 421 | char *key_str = grpc_slice_to_c_string(md->key); |
| 422 | char *value_str = grpc_slice_to_c_string(md->value); |
| 423 | gpr_log(file, line, GPR_LOG_SEVERITY_DEBUG, |
ncteisen | 3ac64f8 | 2017-06-19 17:35:44 -0700 | [diff] [blame^] | 424 | "ELM UNREF:%p:%" PRIdPTR "->%" PRIdPTR ": '%s' = '%s'", |
| 425 | (void *)md, gpr_atm_no_barrier_load(&md->refcnt), |
ncteisen | 4b58405 | 2017-06-08 16:44:38 -0700 | [diff] [blame] | 426 | gpr_atm_no_barrier_load(&md->refcnt) - 1, key_str, value_str); |
| 427 | gpr_free(key_str); |
| 428 | gpr_free(value_str); |
| 429 | } |
Craig Tiller | 1a65a23 | 2015-07-06 10:22:32 -0700 | [diff] [blame] | 430 | #endif |
Craig Tiller | 7c70b6c | 2017-01-23 07:48:42 -0800 | [diff] [blame] | 431 | uint32_t hash = GRPC_MDSTR_KV_HASH(grpc_slice_hash(md->key), |
| 432 | grpc_slice_hash(md->value)); |
| 433 | const gpr_atm prev_refcount = gpr_atm_full_fetch_add(&md->refcnt, -1); |
| 434 | GPR_ASSERT(prev_refcount >= 1); |
| 435 | if (1 == prev_refcount) { |
| 436 | /* once the refcount hits zero, some other thread can come along and |
| 437 | free md at any time: it's unsafe from this point on to access it */ |
| 438 | mdtab_shard *shard = &g_shards[SHARD_IDX(hash)]; |
| 439 | gpr_atm_no_barrier_fetch_add(&shard->free_estimate, 1); |
| 440 | } |
| 441 | break; |
Craig Tiller | 8390153 | 2015-07-10 14:02:45 -0700 | [diff] [blame] | 442 | } |
Craig Tiller | 7c70b6c | 2017-01-23 07:48:42 -0800 | [diff] [blame] | 443 | case GRPC_MDELEM_STORAGE_ALLOCATED: { |
| 444 | allocated_metadata *md = (allocated_metadata *)GRPC_MDELEM_DATA(gmd); |
ncteisen | 4b58405 | 2017-06-08 16:44:38 -0700 | [diff] [blame] | 445 | #ifndef NDEBUG |
| 446 | if (GRPC_TRACER_ON(grpc_trace_metadata)) { |
| 447 | char *key_str = grpc_slice_to_c_string(md->key); |
| 448 | char *value_str = grpc_slice_to_c_string(md->value); |
| 449 | gpr_log(file, line, GPR_LOG_SEVERITY_DEBUG, |
ncteisen | 3ac64f8 | 2017-06-19 17:35:44 -0700 | [diff] [blame^] | 450 | "ELM UNREF:%p:%" PRIdPTR "->%" PRIdPTR ": '%s' = '%s'", |
| 451 | (void *)md, gpr_atm_no_barrier_load(&md->refcnt), |
ncteisen | 4b58405 | 2017-06-08 16:44:38 -0700 | [diff] [blame] | 452 | gpr_atm_no_barrier_load(&md->refcnt) - 1, key_str, value_str); |
| 453 | gpr_free(key_str); |
| 454 | gpr_free(value_str); |
| 455 | } |
Craig Tiller | 7c70b6c | 2017-01-23 07:48:42 -0800 | [diff] [blame] | 456 | #endif |
| 457 | const gpr_atm prev_refcount = gpr_atm_full_fetch_add(&md->refcnt, -1); |
| 458 | GPR_ASSERT(prev_refcount >= 1); |
| 459 | if (1 == prev_refcount) { |
| 460 | grpc_slice_unref_internal(exec_ctx, md->key); |
| 461 | grpc_slice_unref_internal(exec_ctx, md->value); |
| 462 | gpr_free(md); |
| 463 | } |
| 464 | break; |
| 465 | } |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 466 | } |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 467 | } |
Craig Tiller | 0160de9 | 2016-11-18 08:46:46 -0800 | [diff] [blame] | 468 | |
Craig Tiller | 7c70b6c | 2017-01-23 07:48:42 -0800 | [diff] [blame] | 469 | void *grpc_mdelem_get_user_data(grpc_mdelem md, void (*destroy_func)(void *)) { |
| 470 | switch (GRPC_MDELEM_STORAGE(md)) { |
| 471 | case GRPC_MDELEM_STORAGE_EXTERNAL: |
| 472 | case GRPC_MDELEM_STORAGE_ALLOCATED: |
| 473 | return NULL; |
| 474 | case GRPC_MDELEM_STORAGE_STATIC: |
| 475 | return (void *)grpc_static_mdelem_user_data[GRPC_MDELEM_DATA(md) - |
| 476 | grpc_static_mdelem_table]; |
| 477 | case GRPC_MDELEM_STORAGE_INTERNED: { |
| 478 | interned_metadata *im = (interned_metadata *)GRPC_MDELEM_DATA(md); |
| 479 | void *result; |
| 480 | if (gpr_atm_acq_load(&im->destroy_user_data) == (gpr_atm)destroy_func) { |
| 481 | return (void *)gpr_atm_no_barrier_load(&im->user_data); |
| 482 | } else { |
| 483 | return NULL; |
| 484 | } |
| 485 | return result; |
| 486 | } |
Craig Tiller | 5e01e2a | 2017-01-20 18:11:52 -0800 | [diff] [blame] | 487 | } |
Craig Tiller | 7c70b6c | 2017-01-23 07:48:42 -0800 | [diff] [blame] | 488 | GPR_UNREACHABLE_CODE(return NULL); |
| 489 | } |
| 490 | |
| 491 | void *grpc_mdelem_set_user_data(grpc_mdelem md, void (*destroy_func)(void *), |
| 492 | void *user_data) { |
| 493 | switch (GRPC_MDELEM_STORAGE(md)) { |
| 494 | case GRPC_MDELEM_STORAGE_EXTERNAL: |
| 495 | case GRPC_MDELEM_STORAGE_ALLOCATED: |
| 496 | destroy_func(user_data); |
| 497 | return NULL; |
| 498 | case GRPC_MDELEM_STORAGE_STATIC: |
| 499 | destroy_func(user_data); |
| 500 | return (void *)grpc_static_mdelem_user_data[GRPC_MDELEM_DATA(md) - |
| 501 | grpc_static_mdelem_table]; |
| 502 | case GRPC_MDELEM_STORAGE_INTERNED: { |
| 503 | interned_metadata *im = (interned_metadata *)GRPC_MDELEM_DATA(md); |
| 504 | GPR_ASSERT(!is_mdelem_static(md)); |
| 505 | GPR_ASSERT((user_data == NULL) == (destroy_func == NULL)); |
| 506 | gpr_mu_lock(&im->mu_user_data); |
| 507 | if (gpr_atm_no_barrier_load(&im->destroy_user_data)) { |
| 508 | /* user data can only be set once */ |
| 509 | gpr_mu_unlock(&im->mu_user_data); |
| 510 | if (destroy_func != NULL) { |
| 511 | destroy_func(user_data); |
| 512 | } |
| 513 | return (void *)gpr_atm_no_barrier_load(&im->user_data); |
| 514 | } |
| 515 | gpr_atm_no_barrier_store(&im->user_data, (gpr_atm)user_data); |
| 516 | gpr_atm_rel_store(&im->destroy_user_data, (gpr_atm)destroy_func); |
| 517 | gpr_mu_unlock(&im->mu_user_data); |
| 518 | return user_data; |
| 519 | } |
| 520 | } |
| 521 | GPR_UNREACHABLE_CODE(return NULL); |
| 522 | } |
| 523 | |
| 524 | bool grpc_mdelem_eq(grpc_mdelem a, grpc_mdelem b) { |
| 525 | if (a.payload == b.payload) return true; |
| 526 | if (GRPC_MDELEM_IS_INTERNED(a) && GRPC_MDELEM_IS_INTERNED(b)) return false; |
| 527 | if (GRPC_MDISNULL(a) || GRPC_MDISNULL(b)) return false; |
| 528 | return grpc_slice_eq(GRPC_MDKEY(a), GRPC_MDKEY(b)) && |
| 529 | grpc_slice_eq(GRPC_MDVALUE(a), GRPC_MDVALUE(b)); |
Craig Tiller | 0160de9 | 2016-11-18 08:46:46 -0800 | [diff] [blame] | 530 | } |