src/type3_AndroidCloud/anbox-master/src/anbox/common/wait_handle.cpp

   1 /*
   2  * Copyright © 2012-2014 Canonical Ltd.
   3  *
   4  * This program is free software: you can redistribute it and/or modify it
   5  * under the terms of the GNU Lesser General Public License version 3,
   6  * as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU Lesser General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU Lesser General Public License
  14  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  15  *
  16  * Authored by: Kevin DuBois <kevin.dubois@canonical.com>
  17  *              Daniel van Vugt <daniel.van.vugt@canonical.com>
  18  */
  19
  20 #include "anbox/common/wait_handle.h"
  21
  22 namespace anbox {
  23 namespace common {
  24 WaitHandle::WaitHandle()
  25     : guard(), wait_condition(), expecting(0), received(0) {}
  26
  27 WaitHandle::~WaitHandle() {}
  28
  29 void WaitHandle::expect_result() {
  30   std::lock_guard<std::mutex> lock(guard);
  31
  32   expecting++;
  33 }
  34
  35 void WaitHandle::result_received() {
  36   std::lock_guard<std::mutex> lock(guard);
  37
  38   received++;
  39   wait_condition.notify_all();
  40 }
  41
  42 void WaitHandle::wait_for_all()  // wait for all results you expect
  43 {
  44   std::unique_lock<std::mutex> lock(guard);
  45
  46   wait_condition.wait(lock, [&] { return received == expecting; });
  47
  48   received = 0;
  49   expecting = 0;
  50 }
  51
  52 void WaitHandle::wait_for_pending(std::chrono::milliseconds limit) {
  53   std::unique_lock<std::mutex> lock(guard);
  54
  55   wait_condition.wait_for(lock, limit, [&] { return received == expecting; });
  56 }
  57
  58 void WaitHandle::wait_for_one()  // wait for any single result
  59 {
  60   std::unique_lock<std::mutex> lock(guard);
  61
  62   wait_condition.wait(lock, [&] { return received != 0; });
  63
  64   --received;
  65   --expecting;
  66 }
  67
  68 bool WaitHandle::has_result() {
  69   std::lock_guard<std::mutex> lock(guard);
  70
  71   return received > 0;
  72 }
  73
  74 bool WaitHandle::is_pending() {
  75   std::unique_lock<std::mutex> lock(guard);
  76   return expecting > 0 && received != expecting;
  77 }
  78 }  // namespace common
  79 }  // namespace anbox