| /* |
| * |
| * Copyright 2016 gRPC authors. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| * |
| */ |
| |
| #include "src/core/lib/surface/channel_init.h" |
| |
| #include <grpc/support/alloc.h> |
| #include <grpc/support/useful.h> |
| |
| typedef struct stage_slot { |
| grpc_channel_init_stage fn; |
| void *arg; |
| int priority; |
| size_t insertion_order; |
| } stage_slot; |
| |
| typedef struct stage_slots { |
| stage_slot *slots; |
| size_t num_slots; |
| size_t cap_slots; |
| } stage_slots; |
| |
| static stage_slots g_slots[GRPC_NUM_CHANNEL_STACK_TYPES]; |
| static bool g_finalized; |
| |
| void grpc_channel_init_init(void) { |
| for (int i = 0; i < GRPC_NUM_CHANNEL_STACK_TYPES; i++) { |
| g_slots[i].slots = NULL; |
| g_slots[i].num_slots = 0; |
| g_slots[i].cap_slots = 0; |
| } |
| g_finalized = false; |
| } |
| |
| void grpc_channel_init_register_stage(grpc_channel_stack_type type, |
| int priority, |
| grpc_channel_init_stage stage, |
| void *stage_arg) { |
| GPR_ASSERT(!g_finalized); |
| if (g_slots[type].cap_slots == g_slots[type].num_slots) { |
| g_slots[type].cap_slots = GPR_MAX(8, 3 * g_slots[type].cap_slots / 2); |
| g_slots[type].slots = (stage_slot *)gpr_realloc( |
| g_slots[type].slots, |
| g_slots[type].cap_slots * sizeof(*g_slots[type].slots)); |
| } |
| stage_slot *s = &g_slots[type].slots[g_slots[type].num_slots++]; |
| s->insertion_order = g_slots[type].num_slots; |
| s->priority = priority; |
| s->fn = stage; |
| s->arg = stage_arg; |
| } |
| |
| static int compare_slots(const void *a, const void *b) { |
| const stage_slot *sa = (const stage_slot *)a; |
| const stage_slot *sb = (const stage_slot *)b; |
| |
| int c = GPR_ICMP(sa->priority, sb->priority); |
| if (c != 0) return c; |
| return GPR_ICMP(sa->insertion_order, sb->insertion_order); |
| } |
| |
| void grpc_channel_init_finalize(void) { |
| GPR_ASSERT(!g_finalized); |
| for (int i = 0; i < GRPC_NUM_CHANNEL_STACK_TYPES; i++) { |
| qsort(g_slots[i].slots, g_slots[i].num_slots, sizeof(*g_slots[i].slots), |
| compare_slots); |
| } |
| g_finalized = true; |
| } |
| |
| void grpc_channel_init_shutdown(void) { |
| for (int i = 0; i < GRPC_NUM_CHANNEL_STACK_TYPES; i++) { |
| gpr_free(g_slots[i].slots); |
| g_slots[i].slots = (stage_slot *)(void *)(uintptr_t)0xdeadbeef; |
| } |
| } |
| |
| bool grpc_channel_init_create_stack(grpc_exec_ctx *exec_ctx, |
| grpc_channel_stack_builder *builder, |
| grpc_channel_stack_type type) { |
| GPR_ASSERT(g_finalized); |
| |
| grpc_channel_stack_builder_set_name(builder, |
| grpc_channel_stack_type_string(type)); |
| |
| for (size_t i = 0; i < g_slots[type].num_slots; i++) { |
| const stage_slot *slot = &g_slots[type].slots[i]; |
| if (!slot->fn(exec_ctx, builder, slot->arg)) { |
| return false; |
| } |
| } |
| |
| return true; |
| } |