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/*
*
* 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;
}
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