| /** |
| * Copyright 2011-2015 Quickstep Technologies LLC. |
| * Copyright 2015 Pivotal Software, Inc. |
| * |
| * 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. |
| **/ |
| |
| #ifndef QUICKSTEP_THREADING_POSIX_CONDITION_VARIABLE_HPP_ |
| #define QUICKSTEP_THREADING_POSIX_CONDITION_VARIABLE_HPP_ |
| |
| #include <pthread.h> |
| #include <sys/time.h> |
| |
| #include <cerrno> |
| #include <cstdint> |
| #include <ctime> |
| |
| #include "threading/ConditionVariable.hpp" |
| #include "utility/Macros.hpp" |
| |
| #include "glog/logging.h" |
| |
| namespace quickstep { |
| |
| template <bool RECURSIVE> class MutexImplPosix; |
| |
| /** \addtogroup Threading |
| * @{ |
| */ |
| |
| /** |
| * @brief Implementation of ConditionVariable using POSIX threads. |
| **/ |
| class ConditionVariableImplPosix { |
| public: |
| ~ConditionVariableImplPosix() { |
| DO_AND_DEBUG_ASSERT_ZERO(pthread_cond_destroy(&internal_condition_var_)); |
| } |
| |
| inline void await() { |
| DO_AND_DEBUG_ASSERT_ZERO(pthread_cond_wait(&internal_condition_var_, parent_mutex_)); |
| } |
| |
| inline bool awaitWithTimeout(std::uint64_t milliseconds) { |
| struct timespec timeout_time; |
| struct timeval current_time; |
| gettimeofday(¤t_time, nullptr); |
| std::uint64_t nanoseconds |
| = (current_time.tv_usec + milliseconds * UINT64_C(1000)) * UINT64_C(1000); |
| timeout_time.tv_sec = current_time.tv_sec + nanoseconds / UINT64_C(1000000000); |
| timeout_time.tv_nsec = nanoseconds % UINT64_C(1000000000); |
| int error_code = pthread_cond_timedwait(&internal_condition_var_, |
| parent_mutex_, &timeout_time); |
| if (ETIMEDOUT == error_code) { |
| return false; |
| } else { |
| DCHECK_EQ(0, error_code); |
| return true; |
| } |
| } |
| |
| inline void signalOne() { |
| DO_AND_DEBUG_ASSERT_ZERO(pthread_cond_signal(&internal_condition_var_)); |
| } |
| |
| inline void signalAll() { |
| DO_AND_DEBUG_ASSERT_ZERO(pthread_cond_broadcast(&internal_condition_var_)); |
| } |
| |
| private: |
| explicit ConditionVariableImplPosix(pthread_mutex_t *parent_mutex) |
| : parent_mutex_(parent_mutex) { |
| DO_AND_DEBUG_ASSERT_ZERO(pthread_cond_init(&internal_condition_var_, nullptr)); |
| } |
| |
| pthread_mutex_t *parent_mutex_; |
| pthread_cond_t internal_condition_var_; |
| |
| friend class MutexImplPosix<true>; |
| friend class MutexImplPosix<false>; |
| |
| DISALLOW_COPY_AND_ASSIGN(ConditionVariableImplPosix); |
| }; |
| typedef ConditionVariableImplPosix ConditionVariable; |
| |
| /** @} */ |
| |
| } // namespace quickstep |
| |
| #endif // QUICKSTEP_THREADING_POSIX_CONDITION_VARIABLE_HPP_ |