| /* |
| * |
| * Copyright 2016, Google Inc. |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions are |
| * met: |
| * |
| * * Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * * Redistributions in binary form must reproduce the above |
| * copyright notice, this list of conditions and the following disclaimer |
| * in the documentation and/or other materials provided with the |
| * distribution. |
| * * Neither the name of Google Inc. nor the names of its |
| * contributors may be used to endorse or promote products derived from |
| * this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| * |
| */ |
| |
| #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 = |
| 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 = a; |
| const stage_slot *sb = 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 = (void *)(uintptr_t)0xdeadbeef; |
| } |
| } |
| |
| static const char *name_for_type(grpc_channel_stack_type type) { |
| switch (type) { |
| case GRPC_CLIENT_CHANNEL: |
| return "CLIENT_CHANNEL"; |
| case GRPC_CLIENT_SUBCHANNEL: |
| return "CLIENT_SUBCHANNEL"; |
| case GRPC_SERVER_CHANNEL: |
| return "SERVER_CHANNEL"; |
| case GRPC_CLIENT_LAME_CHANNEL: |
| return "CLIENT_LAME_CHANNEL"; |
| case GRPC_CLIENT_DIRECT_CHANNEL: |
| return "CLIENT_DIRECT_CHANNEL"; |
| case GRPC_NUM_CHANNEL_STACK_TYPES: |
| break; |
| } |
| GPR_UNREACHABLE_CODE(return "UNKNOWN"); |
| } |
| |
| 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, name_for_type(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; |
| } |