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 |
ncteisen | 7712c7c | 2017-07-12 23:11:27 -0700 | [diff] [blame^] | 51 | grpc_tracer_flag grpc_trace_metadata = |
| 52 | GRPC_TRACER_INITIALIZER(false, "metadata"); |
Craig Tiller | 1a65a23 | 2015-07-06 10:22:32 -0700 | [diff] [blame] | 53 | #define DEBUG_ARGS , const char *file, int line |
| 54 | #define FWD_DEBUG_ARGS , file, line |
Craig Tiller | b2b4261 | 2015-11-20 12:02:17 -0800 | [diff] [blame] | 55 | #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] | 56 | #else |
| 57 | #define DEBUG_ARGS |
| 58 | #define FWD_DEBUG_ARGS |
Craig Tiller | b2b4261 | 2015-11-20 12:02:17 -0800 | [diff] [blame] | 59 | #define REF_MD_LOCKED(shard, s) ref_md_locked((shard), (s)) |
Craig Tiller | 1a65a23 | 2015-07-06 10:22:32 -0700 | [diff] [blame] | 60 | #endif |
| 61 | |
Craig Tiller | 7c70b6c | 2017-01-23 07:48:42 -0800 | [diff] [blame] | 62 | #define INITIAL_SHARD_CAPACITY 8 |
| 63 | #define LOG2_SHARD_COUNT 4 |
| 64 | #define SHARD_COUNT ((size_t)(1 << LOG2_SHARD_COUNT)) |
| 65 | |
| 66 | #define TABLE_IDX(hash, capacity) (((hash) >> (LOG2_SHARD_COUNT)) % (capacity)) |
| 67 | #define SHARD_IDX(hash) ((hash) & ((1 << (LOG2_SHARD_COUNT)) - 1)) |
Craig Tiller | b2b4261 | 2015-11-20 12:02:17 -0800 | [diff] [blame] | 68 | |
Craig Tiller | 8344daa | 2015-10-09 18:10:57 -0700 | [diff] [blame] | 69 | typedef void (*destroy_user_data_func)(void *user_data); |
| 70 | |
Craig Tiller | 7c70b6c | 2017-01-23 07:48:42 -0800 | [diff] [blame] | 71 | /* Shadow structure for grpc_mdelem_data for interned elements */ |
| 72 | typedef struct interned_metadata { |
| 73 | /* must be byte compatible with grpc_mdelem_data */ |
| 74 | grpc_slice key; |
| 75 | grpc_slice value; |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 76 | |
Craig Tiller | b2b4261 | 2015-11-20 12:02:17 -0800 | [diff] [blame] | 77 | /* private only data */ |
Craig Tiller | 9fa41b9 | 2015-04-10 15:08:03 -0700 | [diff] [blame] | 78 | gpr_atm refcnt; |
| 79 | |
Craig Tiller | 8390153 | 2015-07-10 14:02:45 -0700 | [diff] [blame] | 80 | gpr_mu mu_user_data; |
Craig Tiller | 8344daa | 2015-10-09 18:10:57 -0700 | [diff] [blame] | 81 | gpr_atm destroy_user_data; |
| 82 | gpr_atm user_data; |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 83 | |
Craig Tiller | 7c70b6c | 2017-01-23 07:48:42 -0800 | [diff] [blame] | 84 | struct interned_metadata *bucket_next; |
| 85 | } interned_metadata; |
Craig Tiller | 9ecadce | 2016-11-18 14:52:25 -0800 | [diff] [blame] | 86 | |
Craig Tiller | 7c70b6c | 2017-01-23 07:48:42 -0800 | [diff] [blame] | 87 | /* Shadow structure for grpc_mdelem_data for allocated elements */ |
| 88 | typedef struct allocated_metadata { |
| 89 | /* must be byte compatible with grpc_mdelem_data */ |
| 90 | grpc_slice key; |
| 91 | grpc_slice value; |
| 92 | |
| 93 | /* private only data */ |
| 94 | gpr_atm refcnt; |
| 95 | } allocated_metadata; |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 96 | |
Craig Tiller | b2b4261 | 2015-11-20 12:02:17 -0800 | [diff] [blame] | 97 | typedef struct mdtab_shard { |
| 98 | gpr_mu mu; |
Craig Tiller | 7c70b6c | 2017-01-23 07:48:42 -0800 | [diff] [blame] | 99 | interned_metadata **elems; |
Craig Tiller | b2b4261 | 2015-11-20 12:02:17 -0800 | [diff] [blame] | 100 | size_t count; |
| 101 | size_t capacity; |
Craig Tiller | 8d8f9a8 | 2016-06-03 08:49:11 -0700 | [diff] [blame] | 102 | /** Estimate of the number of unreferenced mdelems in the hash table. |
| 103 | This will eventually converge to the exact number, but it's instantaneous |
| 104 | accuracy is not guaranteed */ |
| 105 | gpr_atm free_estimate; |
Craig Tiller | b2b4261 | 2015-11-20 12:02:17 -0800 | [diff] [blame] | 106 | } mdtab_shard; |
Craig Tiller | 0e72ede | 2015-11-19 07:48:53 -0800 | [diff] [blame] | 107 | |
Craig Tiller | 7c70b6c | 2017-01-23 07:48:42 -0800 | [diff] [blame] | 108 | static mdtab_shard g_shards[SHARD_COUNT]; |
Craig Tiller | b2b4261 | 2015-11-20 12:02:17 -0800 | [diff] [blame] | 109 | |
Craig Tiller | a59c16c | 2016-10-31 07:25:01 -0700 | [diff] [blame] | 110 | static void gc_mdtab(grpc_exec_ctx *exec_ctx, mdtab_shard *shard); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 111 | |
Craig Tiller | 0e72ede | 2015-11-19 07:48:53 -0800 | [diff] [blame] | 112 | void grpc_mdctx_global_init(void) { |
Craig Tiller | b2b4261 | 2015-11-20 12:02:17 -0800 | [diff] [blame] | 113 | /* initialize shards */ |
Craig Tiller | 7c70b6c | 2017-01-23 07:48:42 -0800 | [diff] [blame] | 114 | for (size_t i = 0; i < SHARD_COUNT; i++) { |
| 115 | mdtab_shard *shard = &g_shards[i]; |
Craig Tiller | b2b4261 | 2015-11-20 12:02:17 -0800 | [diff] [blame] | 116 | gpr_mu_init(&shard->mu); |
| 117 | shard->count = 0; |
Craig Tiller | 8d8f9a8 | 2016-06-03 08:49:11 -0700 | [diff] [blame] | 118 | gpr_atm_no_barrier_store(&shard->free_estimate, 0); |
Craig Tiller | 7c70b6c | 2017-01-23 07:48:42 -0800 | [diff] [blame] | 119 | shard->capacity = INITIAL_SHARD_CAPACITY; |
Craig Tiller | 6f41788 | 2017-02-16 14:09:39 -0800 | [diff] [blame] | 120 | shard->elems = gpr_zalloc(sizeof(*shard->elems) * shard->capacity); |
Craig Tiller | 0e72ede | 2015-11-19 07:48:53 -0800 | [diff] [blame] | 121 | } |
| 122 | } |
| 123 | |
Craig Tiller | a59c16c | 2016-10-31 07:25:01 -0700 | [diff] [blame] | 124 | void grpc_mdctx_global_shutdown(grpc_exec_ctx *exec_ctx) { |
Craig Tiller | 7c70b6c | 2017-01-23 07:48:42 -0800 | [diff] [blame] | 125 | for (size_t i = 0; i < SHARD_COUNT; i++) { |
| 126 | mdtab_shard *shard = &g_shards[i]; |
Craig Tiller | b2b4261 | 2015-11-20 12:02:17 -0800 | [diff] [blame] | 127 | gpr_mu_destroy(&shard->mu); |
Craig Tiller | a59c16c | 2016-10-31 07:25:01 -0700 | [diff] [blame] | 128 | gc_mdtab(exec_ctx, shard); |
Craig Tiller | 3407544 | 2015-11-23 16:16:54 -0800 | [diff] [blame] | 129 | /* TODO(ctiller): GPR_ASSERT(shard->count == 0); */ |
| 130 | if (shard->count != 0) { |
Yuchen Zeng | 64c0e8d | 2016-06-10 11:19:51 -0700 | [diff] [blame] | 131 | gpr_log(GPR_DEBUG, "WARNING: %" PRIuPTR " metadata elements were leaked", |
yang-g | d88e1d8 | 2015-12-02 13:23:33 -0800 | [diff] [blame] | 132 | shard->count); |
Craig Tiller | 0cb803d | 2016-03-02 22:17:24 -0800 | [diff] [blame] | 133 | if (grpc_iomgr_abort_on_leaks()) { |
| 134 | abort(); |
| 135 | } |
Craig Tiller | 3407544 | 2015-11-23 16:16:54 -0800 | [diff] [blame] | 136 | } |
Craig Tiller | b2b4261 | 2015-11-20 12:02:17 -0800 | [diff] [blame] | 137 | gpr_free(shard->elems); |
| 138 | } |
Craig Tiller | 0e72ede | 2015-11-19 07:48:53 -0800 | [diff] [blame] | 139 | } |
| 140 | |
Craig Tiller | 7c70b6c | 2017-01-23 07:48:42 -0800 | [diff] [blame] | 141 | static int is_mdelem_static(grpc_mdelem e) { |
| 142 | return GRPC_MDELEM_DATA(e) >= &grpc_static_mdelem_table[0] && |
| 143 | GRPC_MDELEM_DATA(e) < |
| 144 | &grpc_static_mdelem_table[GRPC_STATIC_MDELEM_COUNT]; |
Craig Tiller | 0e72ede | 2015-11-19 07:48:53 -0800 | [diff] [blame] | 145 | } |
| 146 | |
Craig Tiller | b2b4261 | 2015-11-20 12:02:17 -0800 | [diff] [blame] | 147 | static void ref_md_locked(mdtab_shard *shard, |
Craig Tiller | 7c70b6c | 2017-01-23 07:48:42 -0800 | [diff] [blame] | 148 | interned_metadata *md DEBUG_ARGS) { |
ncteisen | 4b58405 | 2017-06-08 16:44:38 -0700 | [diff] [blame] | 149 | #ifndef NDEBUG |
| 150 | if (GRPC_TRACER_ON(grpc_trace_metadata)) { |
| 151 | char *key_str = grpc_slice_to_c_string(md->key); |
| 152 | char *value_str = grpc_slice_to_c_string(md->value); |
| 153 | gpr_log(file, line, GPR_LOG_SEVERITY_DEBUG, |
ncteisen | 3ac64f8 | 2017-06-19 17:35:44 -0700 | [diff] [blame] | 154 | "ELM REF:%p:%" PRIdPTR "->%" PRIdPTR ": '%s' = '%s'", (void *)md, |
ncteisen | 4b58405 | 2017-06-08 16:44:38 -0700 | [diff] [blame] | 155 | gpr_atm_no_barrier_load(&md->refcnt), |
| 156 | gpr_atm_no_barrier_load(&md->refcnt) + 1, key_str, value_str); |
| 157 | gpr_free(key_str); |
| 158 | gpr_free(value_str); |
| 159 | } |
Craig Tiller | 1a65a23 | 2015-07-06 10:22:32 -0700 | [diff] [blame] | 160 | #endif |
Craig Tiller | 8d8f9a8 | 2016-06-03 08:49:11 -0700 | [diff] [blame] | 161 | if (0 == gpr_atm_no_barrier_fetch_add(&md->refcnt, 1)) { |
| 162 | gpr_atm_no_barrier_fetch_add(&shard->free_estimate, -1); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 163 | } |
| 164 | } |
| 165 | |
Craig Tiller | a59c16c | 2016-10-31 07:25:01 -0700 | [diff] [blame] | 166 | static void gc_mdtab(grpc_exec_ctx *exec_ctx, mdtab_shard *shard) { |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 167 | size_t i; |
Craig Tiller | 7c70b6c | 2017-01-23 07:48:42 -0800 | [diff] [blame] | 168 | interned_metadata **prev_next; |
| 169 | interned_metadata *md, *next; |
Craig Tiller | 8d8f9a8 | 2016-06-03 08:49:11 -0700 | [diff] [blame] | 170 | gpr_atm num_freed = 0; |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 171 | |
Craig Tiller | 9d35a1f | 2015-11-02 14:16:12 -0800 | [diff] [blame] | 172 | GPR_TIMER_BEGIN("gc_mdtab", 0); |
Craig Tiller | b2b4261 | 2015-11-20 12:02:17 -0800 | [diff] [blame] | 173 | for (i = 0; i < shard->capacity; i++) { |
| 174 | prev_next = &shard->elems[i]; |
| 175 | for (md = shard->elems[i]; md; md = next) { |
Craig Tiller | 8344daa | 2015-10-09 18:10:57 -0700 | [diff] [blame] | 176 | void *user_data = (void *)gpr_atm_no_barrier_load(&md->user_data); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 177 | next = md->bucket_next; |
Craig Tiller | 9fa41b9 | 2015-04-10 15:08:03 -0700 | [diff] [blame] | 178 | if (gpr_atm_acq_load(&md->refcnt) == 0) { |
Craig Tiller | 7c70b6c | 2017-01-23 07:48:42 -0800 | [diff] [blame] | 179 | grpc_slice_unref_internal(exec_ctx, md->key); |
| 180 | grpc_slice_unref_internal(exec_ctx, md->value); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 181 | if (md->user_data) { |
Craig Tiller | 8344daa | 2015-10-09 18:10:57 -0700 | [diff] [blame] | 182 | ((destroy_user_data_func)gpr_atm_no_barrier_load( |
| 183 | &md->destroy_user_data))(user_data); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 184 | } |
| 185 | gpr_free(md); |
| 186 | *prev_next = next; |
Craig Tiller | 8d8f9a8 | 2016-06-03 08:49:11 -0700 | [diff] [blame] | 187 | num_freed++; |
Craig Tiller | b2b4261 | 2015-11-20 12:02:17 -0800 | [diff] [blame] | 188 | shard->count--; |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 189 | } else { |
| 190 | prev_next = &md->bucket_next; |
| 191 | } |
| 192 | } |
| 193 | } |
Craig Tiller | 8d8f9a8 | 2016-06-03 08:49:11 -0700 | [diff] [blame] | 194 | gpr_atm_no_barrier_fetch_add(&shard->free_estimate, -num_freed); |
Craig Tiller | 9d35a1f | 2015-11-02 14:16:12 -0800 | [diff] [blame] | 195 | GPR_TIMER_END("gc_mdtab", 0); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 196 | } |
| 197 | |
Craig Tiller | b2b4261 | 2015-11-20 12:02:17 -0800 | [diff] [blame] | 198 | static void grow_mdtab(mdtab_shard *shard) { |
| 199 | size_t capacity = shard->capacity * 2; |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 200 | size_t i; |
Craig Tiller | 7c70b6c | 2017-01-23 07:48:42 -0800 | [diff] [blame] | 201 | interned_metadata **mdtab; |
| 202 | interned_metadata *md, *next; |
Craig Tiller | 7536af0 | 2015-12-22 13:49:30 -0800 | [diff] [blame] | 203 | uint32_t hash; |
Craig Tiller | 9d35a1f | 2015-11-02 14:16:12 -0800 | [diff] [blame] | 204 | |
| 205 | GPR_TIMER_BEGIN("grow_mdtab", 0); |
| 206 | |
Craig Tiller | 6f41788 | 2017-02-16 14:09:39 -0800 | [diff] [blame] | 207 | mdtab = gpr_zalloc(sizeof(interned_metadata *) * capacity); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 208 | |
Craig Tiller | b2b4261 | 2015-11-20 12:02:17 -0800 | [diff] [blame] | 209 | for (i = 0; i < shard->capacity; i++) { |
| 210 | for (md = shard->elems[i]; md; md = next) { |
| 211 | size_t idx; |
Craig Tiller | 7c70b6c | 2017-01-23 07:48:42 -0800 | [diff] [blame] | 212 | hash = GRPC_MDSTR_KV_HASH(grpc_slice_hash(md->key), |
| 213 | grpc_slice_hash(md->value)); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 214 | next = md->bucket_next; |
Craig Tiller | 7c70b6c | 2017-01-23 07:48:42 -0800 | [diff] [blame] | 215 | idx = TABLE_IDX(hash, capacity); |
Craig Tiller | b2b4261 | 2015-11-20 12:02:17 -0800 | [diff] [blame] | 216 | md->bucket_next = mdtab[idx]; |
| 217 | mdtab[idx] = md; |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 218 | } |
| 219 | } |
| 220 | |
Craig Tiller | b2b4261 | 2015-11-20 12:02:17 -0800 | [diff] [blame] | 221 | gpr_free(shard->elems); |
| 222 | shard->elems = mdtab; |
| 223 | shard->capacity = capacity; |
Craig Tiller | 9d35a1f | 2015-11-02 14:16:12 -0800 | [diff] [blame] | 224 | |
| 225 | GPR_TIMER_END("grow_mdtab", 0); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 226 | } |
| 227 | |
Craig Tiller | a59c16c | 2016-10-31 07:25:01 -0700 | [diff] [blame] | 228 | static void rehash_mdtab(grpc_exec_ctx *exec_ctx, mdtab_shard *shard) { |
Craig Tiller | 139098c | 2016-06-06 08:10:08 -0700 | [diff] [blame] | 229 | if (gpr_atm_no_barrier_load(&shard->free_estimate) > |
| 230 | (gpr_atm)(shard->capacity / 4)) { |
Craig Tiller | a59c16c | 2016-10-31 07:25:01 -0700 | [diff] [blame] | 231 | gc_mdtab(exec_ctx, shard); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 232 | } else { |
Craig Tiller | b2b4261 | 2015-11-20 12:02:17 -0800 | [diff] [blame] | 233 | grow_mdtab(shard); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 234 | } |
| 235 | } |
| 236 | |
Craig Tiller | 7c70b6c | 2017-01-23 07:48:42 -0800 | [diff] [blame] | 237 | grpc_mdelem grpc_mdelem_create( |
| 238 | grpc_exec_ctx *exec_ctx, grpc_slice key, grpc_slice value, |
| 239 | grpc_mdelem_data *compatible_external_backing_store) { |
| 240 | if (!grpc_slice_is_interned(key) || !grpc_slice_is_interned(value)) { |
| 241 | if (compatible_external_backing_store != NULL) { |
| 242 | return GRPC_MAKE_MDELEM(compatible_external_backing_store, |
| 243 | GRPC_MDELEM_STORAGE_EXTERNAL); |
| 244 | } |
| 245 | |
| 246 | allocated_metadata *allocated = gpr_malloc(sizeof(*allocated)); |
| 247 | allocated->key = grpc_slice_ref_internal(key); |
| 248 | allocated->value = grpc_slice_ref_internal(value); |
| 249 | gpr_atm_rel_store(&allocated->refcnt, 1); |
ncteisen | 4b58405 | 2017-06-08 16:44:38 -0700 | [diff] [blame] | 250 | #ifndef NDEBUG |
| 251 | if (GRPC_TRACER_ON(grpc_trace_metadata)) { |
| 252 | char *key_str = grpc_slice_to_c_string(allocated->key); |
| 253 | char *value_str = grpc_slice_to_c_string(allocated->value); |
ncteisen | 3ac64f8 | 2017-06-19 17:35:44 -0700 | [diff] [blame] | 254 | gpr_log(GPR_DEBUG, "ELM ALLOC:%p:%" PRIdPTR ": '%s' = '%s'", |
| 255 | (void *)allocated, gpr_atm_no_barrier_load(&allocated->refcnt), |
| 256 | key_str, value_str); |
ncteisen | 4b58405 | 2017-06-08 16:44:38 -0700 | [diff] [blame] | 257 | gpr_free(key_str); |
| 258 | gpr_free(value_str); |
| 259 | } |
Craig Tiller | 7c70b6c | 2017-01-23 07:48:42 -0800 | [diff] [blame] | 260 | #endif |
| 261 | return GRPC_MAKE_MDELEM(allocated, GRPC_MDELEM_STORAGE_ALLOCATED); |
| 262 | } |
| 263 | |
| 264 | if (GRPC_IS_STATIC_METADATA_STRING(key) && |
| 265 | GRPC_IS_STATIC_METADATA_STRING(value)) { |
| 266 | grpc_mdelem static_elem = grpc_static_mdelem_for_static_strings( |
| 267 | GRPC_STATIC_METADATA_INDEX(key), GRPC_STATIC_METADATA_INDEX(value)); |
| 268 | if (!GRPC_MDISNULL(static_elem)) { |
| 269 | return static_elem; |
| 270 | } |
| 271 | } |
| 272 | |
| 273 | uint32_t hash = |
| 274 | GRPC_MDSTR_KV_HASH(grpc_slice_hash(key), grpc_slice_hash(value)); |
| 275 | interned_metadata *md; |
| 276 | mdtab_shard *shard = &g_shards[SHARD_IDX(hash)]; |
Craig Tiller | b2b4261 | 2015-11-20 12:02:17 -0800 | [diff] [blame] | 277 | size_t idx; |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 278 | |
Craig Tiller | 9d35a1f | 2015-11-02 14:16:12 -0800 | [diff] [blame] | 279 | GPR_TIMER_BEGIN("grpc_mdelem_from_metadata_strings", 0); |
| 280 | |
Craig Tiller | b2b4261 | 2015-11-20 12:02:17 -0800 | [diff] [blame] | 281 | gpr_mu_lock(&shard->mu); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 282 | |
Craig Tiller | 7c70b6c | 2017-01-23 07:48:42 -0800 | [diff] [blame] | 283 | idx = TABLE_IDX(hash, shard->capacity); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 284 | /* search for an existing pair */ |
Craig Tiller | b2b4261 | 2015-11-20 12:02:17 -0800 | [diff] [blame] | 285 | for (md = shard->elems[idx]; md; md = md->bucket_next) { |
Craig Tiller | 7c70b6c | 2017-01-23 07:48:42 -0800 | [diff] [blame] | 286 | 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] | 287 | REF_MD_LOCKED(shard, md); |
Craig Tiller | b2b4261 | 2015-11-20 12:02:17 -0800 | [diff] [blame] | 288 | gpr_mu_unlock(&shard->mu); |
Craig Tiller | 9d35a1f | 2015-11-02 14:16:12 -0800 | [diff] [blame] | 289 | GPR_TIMER_END("grpc_mdelem_from_metadata_strings", 0); |
Craig Tiller | 7c70b6c | 2017-01-23 07:48:42 -0800 | [diff] [blame] | 290 | return GRPC_MAKE_MDELEM(md, GRPC_MDELEM_STORAGE_INTERNED); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 291 | } |
| 292 | } |
| 293 | |
| 294 | /* not found: create a new pair */ |
Craig Tiller | 7c70b6c | 2017-01-23 07:48:42 -0800 | [diff] [blame] | 295 | md = gpr_malloc(sizeof(interned_metadata)); |
Craig Tiller | 8d8f9a8 | 2016-06-03 08:49:11 -0700 | [diff] [blame] | 296 | gpr_atm_rel_store(&md->refcnt, 1); |
Craig Tiller | 7c70b6c | 2017-01-23 07:48:42 -0800 | [diff] [blame] | 297 | md->key = grpc_slice_ref_internal(key); |
| 298 | md->value = grpc_slice_ref_internal(value); |
Craig Tiller | 8344daa | 2015-10-09 18:10:57 -0700 | [diff] [blame] | 299 | md->user_data = 0; |
| 300 | md->destroy_user_data = 0; |
Craig Tiller | b2b4261 | 2015-11-20 12:02:17 -0800 | [diff] [blame] | 301 | md->bucket_next = shard->elems[idx]; |
| 302 | shard->elems[idx] = md; |
Craig Tiller | 8390153 | 2015-07-10 14:02:45 -0700 | [diff] [blame] | 303 | gpr_mu_init(&md->mu_user_data); |
ncteisen | 4b58405 | 2017-06-08 16:44:38 -0700 | [diff] [blame] | 304 | #ifndef NDEBUG |
| 305 | if (GRPC_TRACER_ON(grpc_trace_metadata)) { |
| 306 | char *key_str = grpc_slice_to_c_string(md->key); |
| 307 | char *value_str = grpc_slice_to_c_string(md->value); |
ncteisen | 3ac64f8 | 2017-06-19 17:35:44 -0700 | [diff] [blame] | 308 | gpr_log(GPR_DEBUG, "ELM NEW:%p:%" PRIdPTR ": '%s' = '%s'", (void *)md, |
ncteisen | 4b58405 | 2017-06-08 16:44:38 -0700 | [diff] [blame] | 309 | gpr_atm_no_barrier_load(&md->refcnt), key_str, value_str); |
| 310 | gpr_free(key_str); |
| 311 | gpr_free(value_str); |
| 312 | } |
Craig Tiller | 1a65a23 | 2015-07-06 10:22:32 -0700 | [diff] [blame] | 313 | #endif |
Craig Tiller | b2b4261 | 2015-11-20 12:02:17 -0800 | [diff] [blame] | 314 | shard->count++; |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 315 | |
Craig Tiller | b2b4261 | 2015-11-20 12:02:17 -0800 | [diff] [blame] | 316 | if (shard->count > shard->capacity * 2) { |
Craig Tiller | a59c16c | 2016-10-31 07:25:01 -0700 | [diff] [blame] | 317 | rehash_mdtab(exec_ctx, shard); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 318 | } |
| 319 | |
Craig Tiller | b2b4261 | 2015-11-20 12:02:17 -0800 | [diff] [blame] | 320 | gpr_mu_unlock(&shard->mu); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 321 | |
Craig Tiller | 9d35a1f | 2015-11-02 14:16:12 -0800 | [diff] [blame] | 322 | GPR_TIMER_END("grpc_mdelem_from_metadata_strings", 0); |
| 323 | |
Craig Tiller | 7c70b6c | 2017-01-23 07:48:42 -0800 | [diff] [blame] | 324 | return GRPC_MAKE_MDELEM(md, GRPC_MDELEM_STORAGE_INTERNED); |
Craig Tiller | 9ecadce | 2016-11-18 14:52:25 -0800 | [diff] [blame] | 325 | } |
| 326 | |
Craig Tiller | 7c70b6c | 2017-01-23 07:48:42 -0800 | [diff] [blame] | 327 | grpc_mdelem grpc_mdelem_from_slices(grpc_exec_ctx *exec_ctx, grpc_slice key, |
| 328 | grpc_slice value) { |
| 329 | grpc_mdelem out = grpc_mdelem_create(exec_ctx, key, value, NULL); |
| 330 | grpc_slice_unref_internal(exec_ctx, key); |
| 331 | grpc_slice_unref_internal(exec_ctx, value); |
| 332 | return out; |
Craig Tiller | 9ecadce | 2016-11-18 14:52:25 -0800 | [diff] [blame] | 333 | } |
| 334 | |
Craig Tiller | 7c70b6c | 2017-01-23 07:48:42 -0800 | [diff] [blame] | 335 | grpc_mdelem grpc_mdelem_from_grpc_metadata(grpc_exec_ctx *exec_ctx, |
| 336 | grpc_metadata *metadata) { |
| 337 | bool changed = false; |
| 338 | grpc_slice key_slice = |
| 339 | grpc_slice_maybe_static_intern(metadata->key, &changed); |
| 340 | grpc_slice value_slice = |
| 341 | grpc_slice_maybe_static_intern(metadata->value, &changed); |
| 342 | return grpc_mdelem_create(exec_ctx, key_slice, value_slice, |
| 343 | changed ? NULL : (grpc_mdelem_data *)metadata); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 344 | } |
| 345 | |
yang-g | 24ba7c1 | 2016-03-30 16:19:43 -0700 | [diff] [blame] | 346 | static size_t get_base64_encoded_size(size_t raw_length) { |
| 347 | static const uint8_t tail_xtra[3] = {0, 2, 3}; |
| 348 | return raw_length / 3 * 4 + tail_xtra[raw_length % 3]; |
| 349 | } |
| 350 | |
Craig Tiller | 7c70b6c | 2017-01-23 07:48:42 -0800 | [diff] [blame] | 351 | size_t grpc_mdelem_get_size_in_hpack_table(grpc_mdelem elem) { |
| 352 | size_t overhead_and_key = 32 + GRPC_SLICE_LENGTH(GRPC_MDKEY(elem)); |
| 353 | size_t value_len = GRPC_SLICE_LENGTH(GRPC_MDVALUE(elem)); |
| 354 | if (grpc_is_binary_header(GRPC_MDKEY(elem))) { |
| 355 | return overhead_and_key + get_base64_encoded_size(value_len); |
yang-g | cb7a802 | 2016-03-30 14:58:53 -0700 | [diff] [blame] | 356 | } else { |
Craig Tiller | 7c70b6c | 2017-01-23 07:48:42 -0800 | [diff] [blame] | 357 | return overhead_and_key + value_len; |
yang-g | cb7a802 | 2016-03-30 14:58:53 -0700 | [diff] [blame] | 358 | } |
| 359 | } |
| 360 | |
Craig Tiller | 7c70b6c | 2017-01-23 07:48:42 -0800 | [diff] [blame] | 361 | grpc_mdelem grpc_mdelem_ref(grpc_mdelem gmd DEBUG_ARGS) { |
| 362 | switch (GRPC_MDELEM_STORAGE(gmd)) { |
| 363 | case GRPC_MDELEM_STORAGE_EXTERNAL: |
| 364 | case GRPC_MDELEM_STORAGE_STATIC: |
| 365 | break; |
| 366 | case GRPC_MDELEM_STORAGE_INTERNED: { |
| 367 | interned_metadata *md = (interned_metadata *)GRPC_MDELEM_DATA(gmd); |
ncteisen | 4b58405 | 2017-06-08 16:44:38 -0700 | [diff] [blame] | 368 | #ifndef NDEBUG |
| 369 | if (GRPC_TRACER_ON(grpc_trace_metadata)) { |
| 370 | char *key_str = grpc_slice_to_c_string(md->key); |
| 371 | char *value_str = grpc_slice_to_c_string(md->value); |
| 372 | gpr_log(file, line, GPR_LOG_SEVERITY_DEBUG, |
ncteisen | 3ac64f8 | 2017-06-19 17:35:44 -0700 | [diff] [blame] | 373 | "ELM REF:%p:%" PRIdPTR "->%" PRIdPTR ": '%s' = '%s'", |
| 374 | (void *)md, gpr_atm_no_barrier_load(&md->refcnt), |
ncteisen | 4b58405 | 2017-06-08 16:44:38 -0700 | [diff] [blame] | 375 | gpr_atm_no_barrier_load(&md->refcnt) + 1, key_str, value_str); |
| 376 | gpr_free(key_str); |
| 377 | gpr_free(value_str); |
| 378 | } |
Craig Tiller | 1a65a23 | 2015-07-06 10:22:32 -0700 | [diff] [blame] | 379 | #endif |
Craig Tiller | 7c70b6c | 2017-01-23 07:48:42 -0800 | [diff] [blame] | 380 | /* we can assume the ref count is >= 1 as the application is calling |
| 381 | this function - meaning that no adjustment to mdtab_free is necessary, |
| 382 | simplifying the logic here to be just an atomic increment */ |
| 383 | /* use C assert to have this removed in opt builds */ |
| 384 | GPR_ASSERT(gpr_atm_no_barrier_load(&md->refcnt) >= 1); |
| 385 | gpr_atm_no_barrier_fetch_add(&md->refcnt, 1); |
| 386 | break; |
| 387 | } |
| 388 | case GRPC_MDELEM_STORAGE_ALLOCATED: { |
| 389 | allocated_metadata *md = (allocated_metadata *)GRPC_MDELEM_DATA(gmd); |
ncteisen | 4b58405 | 2017-06-08 16:44:38 -0700 | [diff] [blame] | 390 | #ifndef NDEBUG |
| 391 | if (GRPC_TRACER_ON(grpc_trace_metadata)) { |
| 392 | char *key_str = grpc_slice_to_c_string(md->key); |
| 393 | char *value_str = grpc_slice_to_c_string(md->value); |
| 394 | gpr_log(file, line, GPR_LOG_SEVERITY_DEBUG, |
ncteisen | 3ac64f8 | 2017-06-19 17:35:44 -0700 | [diff] [blame] | 395 | "ELM REF:%p:%" PRIdPTR "->%" PRIdPTR ": '%s' = '%s'", |
| 396 | (void *)md, gpr_atm_no_barrier_load(&md->refcnt), |
ncteisen | 4b58405 | 2017-06-08 16:44:38 -0700 | [diff] [blame] | 397 | gpr_atm_no_barrier_load(&md->refcnt) + 1, key_str, value_str); |
| 398 | gpr_free(key_str); |
| 399 | gpr_free(value_str); |
ncteisen | d39010e | 2017-06-08 17:08:07 -0700 | [diff] [blame] | 400 | } |
Craig Tiller | 7c70b6c | 2017-01-23 07:48:42 -0800 | [diff] [blame] | 401 | #endif |
| 402 | /* we can assume the ref count is >= 1 as the application is calling |
| 403 | this function - meaning that no adjustment to mdtab_free is necessary, |
| 404 | simplifying the logic here to be just an atomic increment */ |
| 405 | /* use C assert to have this removed in opt builds */ |
| 406 | gpr_atm_no_barrier_fetch_add(&md->refcnt, 1); |
| 407 | break; |
| 408 | } |
| 409 | } |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 410 | return gmd; |
| 411 | } |
| 412 | |
Craig Tiller | 7c70b6c | 2017-01-23 07:48:42 -0800 | [diff] [blame] | 413 | void grpc_mdelem_unref(grpc_exec_ctx *exec_ctx, grpc_mdelem gmd DEBUG_ARGS) { |
| 414 | switch (GRPC_MDELEM_STORAGE(gmd)) { |
| 415 | case GRPC_MDELEM_STORAGE_EXTERNAL: |
| 416 | case GRPC_MDELEM_STORAGE_STATIC: |
| 417 | break; |
| 418 | case GRPC_MDELEM_STORAGE_INTERNED: { |
| 419 | interned_metadata *md = (interned_metadata *)GRPC_MDELEM_DATA(gmd); |
ncteisen | 4b58405 | 2017-06-08 16:44:38 -0700 | [diff] [blame] | 420 | #ifndef NDEBUG |
| 421 | if (GRPC_TRACER_ON(grpc_trace_metadata)) { |
| 422 | char *key_str = grpc_slice_to_c_string(md->key); |
| 423 | char *value_str = grpc_slice_to_c_string(md->value); |
| 424 | gpr_log(file, line, GPR_LOG_SEVERITY_DEBUG, |
ncteisen | 3ac64f8 | 2017-06-19 17:35:44 -0700 | [diff] [blame] | 425 | "ELM UNREF:%p:%" PRIdPTR "->%" PRIdPTR ": '%s' = '%s'", |
| 426 | (void *)md, gpr_atm_no_barrier_load(&md->refcnt), |
ncteisen | 4b58405 | 2017-06-08 16:44:38 -0700 | [diff] [blame] | 427 | gpr_atm_no_barrier_load(&md->refcnt) - 1, key_str, value_str); |
| 428 | gpr_free(key_str); |
| 429 | gpr_free(value_str); |
| 430 | } |
Craig Tiller | 1a65a23 | 2015-07-06 10:22:32 -0700 | [diff] [blame] | 431 | #endif |
Craig Tiller | 7c70b6c | 2017-01-23 07:48:42 -0800 | [diff] [blame] | 432 | uint32_t hash = GRPC_MDSTR_KV_HASH(grpc_slice_hash(md->key), |
| 433 | grpc_slice_hash(md->value)); |
| 434 | const gpr_atm prev_refcount = gpr_atm_full_fetch_add(&md->refcnt, -1); |
| 435 | GPR_ASSERT(prev_refcount >= 1); |
| 436 | if (1 == prev_refcount) { |
| 437 | /* once the refcount hits zero, some other thread can come along and |
| 438 | free md at any time: it's unsafe from this point on to access it */ |
| 439 | mdtab_shard *shard = &g_shards[SHARD_IDX(hash)]; |
| 440 | gpr_atm_no_barrier_fetch_add(&shard->free_estimate, 1); |
| 441 | } |
| 442 | break; |
Craig Tiller | 8390153 | 2015-07-10 14:02:45 -0700 | [diff] [blame] | 443 | } |
Craig Tiller | 7c70b6c | 2017-01-23 07:48:42 -0800 | [diff] [blame] | 444 | case GRPC_MDELEM_STORAGE_ALLOCATED: { |
| 445 | allocated_metadata *md = (allocated_metadata *)GRPC_MDELEM_DATA(gmd); |
ncteisen | 4b58405 | 2017-06-08 16:44:38 -0700 | [diff] [blame] | 446 | #ifndef NDEBUG |
| 447 | if (GRPC_TRACER_ON(grpc_trace_metadata)) { |
| 448 | char *key_str = grpc_slice_to_c_string(md->key); |
| 449 | char *value_str = grpc_slice_to_c_string(md->value); |
| 450 | gpr_log(file, line, GPR_LOG_SEVERITY_DEBUG, |
ncteisen | 3ac64f8 | 2017-06-19 17:35:44 -0700 | [diff] [blame] | 451 | "ELM UNREF:%p:%" PRIdPTR "->%" PRIdPTR ": '%s' = '%s'", |
| 452 | (void *)md, gpr_atm_no_barrier_load(&md->refcnt), |
ncteisen | 4b58405 | 2017-06-08 16:44:38 -0700 | [diff] [blame] | 453 | gpr_atm_no_barrier_load(&md->refcnt) - 1, key_str, value_str); |
| 454 | gpr_free(key_str); |
| 455 | gpr_free(value_str); |
| 456 | } |
Craig Tiller | 7c70b6c | 2017-01-23 07:48:42 -0800 | [diff] [blame] | 457 | #endif |
| 458 | const gpr_atm prev_refcount = gpr_atm_full_fetch_add(&md->refcnt, -1); |
| 459 | GPR_ASSERT(prev_refcount >= 1); |
| 460 | if (1 == prev_refcount) { |
| 461 | grpc_slice_unref_internal(exec_ctx, md->key); |
| 462 | grpc_slice_unref_internal(exec_ctx, md->value); |
| 463 | gpr_free(md); |
| 464 | } |
| 465 | break; |
| 466 | } |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 467 | } |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 468 | } |
Craig Tiller | 0160de9 | 2016-11-18 08:46:46 -0800 | [diff] [blame] | 469 | |
Craig Tiller | 7c70b6c | 2017-01-23 07:48:42 -0800 | [diff] [blame] | 470 | void *grpc_mdelem_get_user_data(grpc_mdelem md, void (*destroy_func)(void *)) { |
| 471 | switch (GRPC_MDELEM_STORAGE(md)) { |
| 472 | case GRPC_MDELEM_STORAGE_EXTERNAL: |
| 473 | case GRPC_MDELEM_STORAGE_ALLOCATED: |
| 474 | return NULL; |
| 475 | case GRPC_MDELEM_STORAGE_STATIC: |
| 476 | return (void *)grpc_static_mdelem_user_data[GRPC_MDELEM_DATA(md) - |
| 477 | grpc_static_mdelem_table]; |
| 478 | case GRPC_MDELEM_STORAGE_INTERNED: { |
| 479 | interned_metadata *im = (interned_metadata *)GRPC_MDELEM_DATA(md); |
| 480 | void *result; |
| 481 | if (gpr_atm_acq_load(&im->destroy_user_data) == (gpr_atm)destroy_func) { |
| 482 | return (void *)gpr_atm_no_barrier_load(&im->user_data); |
| 483 | } else { |
| 484 | return NULL; |
| 485 | } |
| 486 | return result; |
| 487 | } |
Craig Tiller | 5e01e2a | 2017-01-20 18:11:52 -0800 | [diff] [blame] | 488 | } |
Craig Tiller | 7c70b6c | 2017-01-23 07:48:42 -0800 | [diff] [blame] | 489 | GPR_UNREACHABLE_CODE(return NULL); |
| 490 | } |
| 491 | |
| 492 | void *grpc_mdelem_set_user_data(grpc_mdelem md, void (*destroy_func)(void *), |
| 493 | void *user_data) { |
| 494 | switch (GRPC_MDELEM_STORAGE(md)) { |
| 495 | case GRPC_MDELEM_STORAGE_EXTERNAL: |
| 496 | case GRPC_MDELEM_STORAGE_ALLOCATED: |
| 497 | destroy_func(user_data); |
| 498 | return NULL; |
| 499 | case GRPC_MDELEM_STORAGE_STATIC: |
| 500 | destroy_func(user_data); |
| 501 | return (void *)grpc_static_mdelem_user_data[GRPC_MDELEM_DATA(md) - |
| 502 | grpc_static_mdelem_table]; |
| 503 | case GRPC_MDELEM_STORAGE_INTERNED: { |
| 504 | interned_metadata *im = (interned_metadata *)GRPC_MDELEM_DATA(md); |
| 505 | GPR_ASSERT(!is_mdelem_static(md)); |
| 506 | GPR_ASSERT((user_data == NULL) == (destroy_func == NULL)); |
| 507 | gpr_mu_lock(&im->mu_user_data); |
| 508 | if (gpr_atm_no_barrier_load(&im->destroy_user_data)) { |
| 509 | /* user data can only be set once */ |
| 510 | gpr_mu_unlock(&im->mu_user_data); |
| 511 | if (destroy_func != NULL) { |
| 512 | destroy_func(user_data); |
| 513 | } |
| 514 | return (void *)gpr_atm_no_barrier_load(&im->user_data); |
| 515 | } |
| 516 | gpr_atm_no_barrier_store(&im->user_data, (gpr_atm)user_data); |
| 517 | gpr_atm_rel_store(&im->destroy_user_data, (gpr_atm)destroy_func); |
| 518 | gpr_mu_unlock(&im->mu_user_data); |
| 519 | return user_data; |
| 520 | } |
| 521 | } |
| 522 | GPR_UNREACHABLE_CODE(return NULL); |
| 523 | } |
| 524 | |
| 525 | bool grpc_mdelem_eq(grpc_mdelem a, grpc_mdelem b) { |
| 526 | if (a.payload == b.payload) return true; |
| 527 | if (GRPC_MDELEM_IS_INTERNED(a) && GRPC_MDELEM_IS_INTERNED(b)) return false; |
| 528 | if (GRPC_MDISNULL(a) || GRPC_MDISNULL(b)) return false; |
| 529 | return grpc_slice_eq(GRPC_MDKEY(a), GRPC_MDKEY(b)) && |
| 530 | grpc_slice_eq(GRPC_MDVALUE(a), GRPC_MDVALUE(b)); |
Craig Tiller | 0160de9 | 2016-11-18 08:46:46 -0800 | [diff] [blame] | 531 | } |