legacy-libs/grpc/deps/grpc/src/core/lib/iomgr/wakeup_fd_posix.cc

   1 /*
   2  *
   3  * Copyright 2015 gRPC authors.
   4  *
   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
   8  *
   9  *     http://www.apache.org/licenses/LICENSE-2.0
  10  *
  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.
  16  *
  17  */
  18
  19 #include <grpc/support/port_platform.h>
  20
  21 #include "src/core/lib/iomgr/port.h"
  22
  23 #ifdef GRPC_POSIX_WAKEUP_FD
  24
  25 #include <stddef.h>
  26 #include "src/core/lib/iomgr/wakeup_fd_pipe.h"
  27 #include "src/core/lib/iomgr/wakeup_fd_posix.h"
  28
  29 static const grpc_wakeup_fd_vtable* wakeup_fd_vtable = nullptr;
  30
  31 int grpc_allow_specialized_wakeup_fd = 1;
  32 int grpc_allow_pipe_wakeup_fd = 1;
  33
  34 int has_real_wakeup_fd = 1;
  35 int cv_wakeup_fds_enabled = 0;
  36
  37 void grpc_wakeup_fd_global_init(void) {
  38   if (grpc_allow_specialized_wakeup_fd &&
  39       grpc_specialized_wakeup_fd_vtable.check_availability()) {
  40     wakeup_fd_vtable = &grpc_specialized_wakeup_fd_vtable;
  41   } else if (grpc_allow_pipe_wakeup_fd &&
  42              grpc_pipe_wakeup_fd_vtable.check_availability()) {
  43     wakeup_fd_vtable = &grpc_pipe_wakeup_fd_vtable;
  44   } else {
  45     has_real_wakeup_fd = 0;
  46   }
  47 }
  48
  49 void grpc_wakeup_fd_global_destroy(void) { wakeup_fd_vtable = nullptr; }
  50
  51 int grpc_has_wakeup_fd(void) { return has_real_wakeup_fd; }
  52
  53 grpc_error* grpc_wakeup_fd_init(grpc_wakeup_fd* fd_info) {
  54   return wakeup_fd_vtable->init(fd_info);
  55 }
  56
  57 grpc_error* grpc_wakeup_fd_consume_wakeup(grpc_wakeup_fd* fd_info) {
  58   return wakeup_fd_vtable->consume(fd_info);
  59 }
  60
  61 grpc_error* grpc_wakeup_fd_wakeup(grpc_wakeup_fd* fd_info) {
  62   return wakeup_fd_vtable->wakeup(fd_info);
  63 }
  64
  65 void grpc_wakeup_fd_destroy(grpc_wakeup_fd* fd_info) {
  66   wakeup_fd_vtable->destroy(fd_info);
  67 }
  68
  69 #endif /* GRPC_POSIX_WAKEUP_FD */