Release based on cl/313536507.

Signed-off-by: Alexey Polyudov <apolyudov@google.com>
Change-Id: I83ec7dee1a7ef6f4bdfd47482c94d03910525b7e

cpp/platform_v2/impl/shared/BUILD

@@ -0,0 +1,48 @@
+# Copyright 2020 Google LLC
+#
+# 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
+#
+#     https://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.
+
+cc_library(
+    name = "posix_mutex",
+    srcs = [
+        "posix_mutex.cc",
+    ],
+    hdrs = [
+        "posix_mutex.h",
+    ],
+    visibility = [
+        "//platform_v2/impl:__subpackages__",
+    ],
+    deps = [
+        "//platform_v2/api",
+        "//platform_v2/base",
+    ],
+)
+
+cc_library(
+    name = "posix_condition_variable",
+    srcs = [
+        "posix_condition_variable.cc",
+    ],
+    hdrs = [
+        "posix_condition_variable.h",
+    ],
+    visibility = [
+        "//platform_v2/impl:__subpackages__",
+    ],
+    deps = [
+        ":posix_mutex",
+        "//platform_v2/api",
+        "//platform_v2/base",
+    ],
+)

cpp/platform_v2/impl/shared/posix_condition_variable.cc

@@ -0,0 +1,44 @@
+// Copyright 2020 Google LLC
+//
+// 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
+//
+//     https://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 "platform_v2/impl/shared/posix_condition_variable.h"
+
+namespace location {
+namespace nearby {
+namespace posix {
+
+ConditionVariable::ConditionVariable(Mutex* mutex)
+    : mutex_(mutex), attr_(), cond_() {
+  pthread_condattr_init(&attr_);
+
+  pthread_cond_init(&cond_, &attr_);
+}
+
+ConditionVariable::~ConditionVariable() {
+  pthread_cond_destroy(&cond_);
+
+  pthread_condattr_destroy(&attr_);
+}
+
+void ConditionVariable::Notify() { pthread_cond_broadcast(&cond_); }
+
+Exception ConditionVariable::Wait() {
+  pthread_cond_wait(&cond_, &(mutex_->mutex_));
+
+  return {Exception::kSuccess};
+}
+
+}  // namespace posix
+}  // namespace nearby
+}  // namespace location

cpp/platform_v2/impl/shared/posix_condition_variable.h

@@ -0,0 +1,45 @@
+// Copyright 2020 Google LLC
+//
+// 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
+//
+//     https://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 PLATFORM_V2_IMPL_SHARED_POSIX_CONDITION_VARIABLE_H_
+#define PLATFORM_V2_IMPL_SHARED_POSIX_CONDITION_VARIABLE_H_
+
+#include <pthread.h>
+
+#include "platform_v2/api/condition_variable.h"
+#include "platform_v2/impl/shared/posix_mutex.h"
+
+namespace location {
+namespace nearby {
+namespace posix {
+
+class ConditionVariable : public api::ConditionVariable {
+ public:
+  explicit ConditionVariable(Mutex* mutex);
+  ~ConditionVariable() override;
+
+  void Notify() override;
+  Exception Wait() override;
+
+ private:
+  Mutex* mutex_;
+  pthread_condattr_t attr_;
+  pthread_cond_t cond_;
+};
+
+}  // namespace posix
+}  // namespace nearby
+}  // namespace location
+
+#endif  // PLATFORM_V2_IMPL_SHARED_POSIX_CONDITION_VARIABLE_H_

cpp/platform_v2/impl/shared/posix_mutex.cc

@@ -0,0 +1,40 @@
+// Copyright 2020 Google LLC
+//
+// 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
+//
+//     https://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 "platform_v2/impl/shared/posix_mutex.h"
+
+namespace location {
+namespace nearby {
+namespace posix {
+
+Mutex::Mutex() : attr_(), mutex_() {
+  pthread_mutexattr_init(&attr_);
+  pthread_mutexattr_settype(&attr_, PTHREAD_MUTEX_RECURSIVE);
+
+  pthread_mutex_init(&mutex_, &attr_);
+}
+
+Mutex::~Mutex() {
+  pthread_mutex_destroy(&mutex_);
+
+  pthread_mutexattr_destroy(&attr_);
+}
+
+void Mutex::Lock() { pthread_mutex_lock(&mutex_); }
+
+void Mutex::Unlock() { pthread_mutex_unlock(&mutex_); }
+
+}  // namespace posix
+}  // namespace nearby
+}  // namespace location

cpp/platform_v2/impl/shared/posix_mutex.h

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+// Copyright 2020 Google LLC
+//
+// 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
+//
+//     https://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 PLATFORM_V2_IMPL_SHARED_POSIX_MUTEX_H_
+#define PLATFORM_V2_IMPL_SHARED_POSIX_MUTEX_H_
+
+#include <pthread.h>
+
+#include "platform_v2/api/mutex.h"
+
+namespace location {
+namespace nearby {
+namespace posix {
+
+class ABSL_LOCKABLE Mutex : public api::Mutex {
+ public:
+  Mutex();
+  ~Mutex() override;
+
+  void Lock() ABSL_EXCLUSIVE_LOCK_FUNCTION() override;
+  void Unlock() ABSL_UNLOCK_FUNCTION() override;
+
+ private:
+  friend class ConditionVariable;
+
+  pthread_mutexattr_t attr_;
+  pthread_mutex_t mutex_;
+};
+
+}  // namespace posix
+}  // namespace nearby
+}  // namespace location
+
+#endif  // PLATFORM_V2_IMPL_SHARED_POSIX_MUTEX_H_