| /* |
| * Copyright 2019 The Android Open Source Project |
| * |
| * 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 "reactive_semaphore.h" |
| |
| #include <string.h> |
| #include <sys/eventfd.h> |
| #include <unistd.h> |
| |
| #include <functional> |
| |
| #include "os/linux_generic/linux.h" |
| #include "os/log.h" |
| |
| namespace bluetooth { |
| namespace os { |
| |
| ReactiveSemaphore::ReactiveSemaphore(unsigned int value) : fd_(eventfd(value, EFD_SEMAPHORE | EFD_NONBLOCK)) { |
| ASSERT(fd_ != -1); |
| } |
| |
| ReactiveSemaphore::~ReactiveSemaphore() { |
| int close_status; |
| RUN_NO_INTR(close_status = close(fd_)); |
| ASSERT_LOG(close_status != -1, "close failed: %s", strerror(errno)); |
| } |
| |
| void ReactiveSemaphore::Decrease() { |
| uint64_t val = 0; |
| auto read_result = eventfd_read(fd_, &val); |
| ASSERT_LOG(read_result != -1, "decrease failed: %s", strerror(errno)); |
| } |
| |
| void ReactiveSemaphore::Increase() { |
| uint64_t val = 1; |
| auto write_result = eventfd_write(fd_, val); |
| ASSERT_LOG(write_result != -1, "increase failed: %s", strerror(errno)); |
| } |
| |
| int ReactiveSemaphore::GetFd() { |
| return fd_; |
| } |
| |
| } // namespace os |
| } // namespace bluetooth |