Repo created

TMessagesProj/jni/voip/webrtc/rtc_base/platform_thread.h

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+/*
+ *  Copyright (c) 2015 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef RTC_BASE_PLATFORM_THREAD_H_
+#define RTC_BASE_PLATFORM_THREAD_H_
+
+#include <functional>
+#include <string>
+#if !defined(WEBRTC_WIN)
+#include <pthread.h>
+#endif
+
+#include "absl/strings/string_view.h"
+#include "absl/types/optional.h"
+#include "rtc_base/platform_thread_types.h"
+
+namespace rtc {
+
+enum class ThreadPriority {
+  kLow = 1,
+  kNormal,
+  kHigh,
+  kRealtime,
+};
+
+struct ThreadAttributes {
+  ThreadPriority priority = ThreadPriority::kNormal;
+  ThreadAttributes& SetPriority(ThreadPriority priority_param) {
+    priority = priority_param;
+    return *this;
+  }
+};
+
+// Represents a simple worker thread.
+class PlatformThread final {
+ public:
+  // Handle is the base platform thread handle.
+#if defined(WEBRTC_WIN)
+  using Handle = HANDLE;
+#else
+  using Handle = pthread_t;
+#endif  // defined(WEBRTC_WIN)
+  // This ctor creates the PlatformThread with an unset handle (returning true
+  // in empty()) and is provided for convenience.
+  // TODO(bugs.webrtc.org/12727) Look into if default and move support can be
+  // removed.
+  PlatformThread() = default;
+
+  // Moves `rhs` into this, storing an empty state in `rhs`.
+  // TODO(bugs.webrtc.org/12727) Look into if default and move support can be
+  // removed.
+  PlatformThread(PlatformThread&& rhs);
+
+  // Copies won't work since we'd have problems with joinable threads.
+  PlatformThread(const PlatformThread&) = delete;
+  PlatformThread& operator=(const PlatformThread&) = delete;
+
+  // Moves `rhs` into this, storing an empty state in `rhs`.
+  // TODO(bugs.webrtc.org/12727) Look into if default and move support can be
+  // removed.
+  PlatformThread& operator=(PlatformThread&& rhs);
+
+  // For a PlatformThread that's been spawned joinable, the destructor suspends
+  // the calling thread until the created thread exits unless the thread has
+  // already exited.
+  virtual ~PlatformThread();
+
+  // Finalizes any allocated resources.
+  // For a PlatformThread that's been spawned joinable, Finalize() suspends
+  // the calling thread until the created thread exits unless the thread has
+  // already exited.
+  // empty() returns true after completion.
+  void Finalize();
+
+  // Returns true if default constructed, moved from, or Finalize()ed.
+  bool empty() const { return !handle_.has_value(); }
+
+  // Creates a started joinable thread which will be joined when the returned
+  // PlatformThread destructs or Finalize() is called.
+  static PlatformThread SpawnJoinable(
+      std::function<void()> thread_function,
+      absl::string_view name,
+      ThreadAttributes attributes = ThreadAttributes());
+
+  // Creates a started detached thread. The caller has to use external
+  // synchronization as nothing is provided by the PlatformThread construct.
+  static PlatformThread SpawnDetached(
+      std::function<void()> thread_function,
+      absl::string_view name,
+      ThreadAttributes attributes = ThreadAttributes());
+
+  // Returns the base platform thread handle of this thread.
+  absl::optional<Handle> GetHandle() const;
+
+#if defined(WEBRTC_WIN)
+  // Queue a Windows APC function that runs when the thread is alertable.
+  bool QueueAPC(PAPCFUNC apc_function, ULONG_PTR data);
+#endif
+
+ private:
+  PlatformThread(Handle handle, bool joinable);
+  static PlatformThread SpawnThread(std::function<void()> thread_function,
+                                    absl::string_view name,
+                                    ThreadAttributes attributes,
+                                    bool joinable);
+
+  absl::optional<Handle> handle_;
+  bool joinable_ = false;
+};
+
+}  // namespace rtc
+
+#endif  // RTC_BASE_PLATFORM_THREAD_H_