Restoring authorship annotation for <anastasy888@yandex-team.ru>. Commit 1 of 2.

1 files changed, 214 insertions, 214 deletions

diff --git a/contrib/restricted/abseil-cpp/absl/base/call_once.h b/contrib/restricted/abseil-cpp/absl/base/call_once.h
index 96109f537c..548824e3d5 100644
--- a/contrib/restricted/abseil-cpp/absl/base/call_once.h
+++ b/contrib/restricted/abseil-cpp/absl/base/call_once.h
@@ -1,219 +1,219 @@
-// Copyright 2017 The Abseil Authors.
-//
-// 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.
-//
-// -----------------------------------------------------------------------------
-// File: call_once.h
-// -----------------------------------------------------------------------------
-//
-// This header file provides an Abseil version of `std::call_once` for invoking
-// a given function at most once, across all threads. This Abseil version is
-// faster than the C++11 version and incorporates the C++17 argument-passing
-// fix, so that (for example) non-const references may be passed to the invoked
-// function.
-
-#ifndef ABSL_BASE_CALL_ONCE_H_
-#define ABSL_BASE_CALL_ONCE_H_
-
-#include <algorithm>
-#include <atomic>
-#include <cstdint>
-#include <type_traits>
-#include <utility>
-
-#include "absl/base/internal/invoke.h"
-#include "absl/base/internal/low_level_scheduling.h"
-#include "absl/base/internal/raw_logging.h"
-#include "absl/base/internal/scheduling_mode.h"
-#include "absl/base/internal/spinlock_wait.h"
-#include "absl/base/macros.h"
-#include "absl/base/optimization.h"
-#include "absl/base/port.h"
-
-namespace absl {
+// Copyright 2017 The Abseil Authors. 
+// 
+// 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. 
+// 
+// ----------------------------------------------------------------------------- 
+// File: call_once.h 
+// ----------------------------------------------------------------------------- 
+// 
+// This header file provides an Abseil version of `std::call_once` for invoking 
+// a given function at most once, across all threads. This Abseil version is 
+// faster than the C++11 version and incorporates the C++17 argument-passing 
+// fix, so that (for example) non-const references may be passed to the invoked 
+// function. 
+ 
+#ifndef ABSL_BASE_CALL_ONCE_H_ 
+#define ABSL_BASE_CALL_ONCE_H_ 
+ 
+#include <algorithm> 
+#include <atomic> 
+#include <cstdint> 
+#include <type_traits> 
+#include <utility> 
+ 
+#include "absl/base/internal/invoke.h" 
+#include "absl/base/internal/low_level_scheduling.h" 
+#include "absl/base/internal/raw_logging.h" 
+#include "absl/base/internal/scheduling_mode.h" 
+#include "absl/base/internal/spinlock_wait.h" 
+#include "absl/base/macros.h" 
+#include "absl/base/optimization.h" 
+#include "absl/base/port.h" 
+ 
+namespace absl { 
 ABSL_NAMESPACE_BEGIN
-
-class once_flag;
-
-namespace base_internal {
-std::atomic<uint32_t>* ControlWord(absl::once_flag* flag);
-}  // namespace base_internal
-
-// call_once()
-//
-// For all invocations using a given `once_flag`, invokes a given `fn` exactly
-// once across all threads. The first call to `call_once()` with a particular
-// `once_flag` argument (that does not throw an exception) will run the
-// specified function with the provided `args`; other calls with the same
-// `once_flag` argument will not run the function, but will wait
-// for the provided function to finish running (if it is still running).
-//
-// This mechanism provides a safe, simple, and fast mechanism for one-time
-// initialization in a multi-threaded process.
-//
-// Example:
-//
-// class MyInitClass {
-//  public:
-//  ...
-//  mutable absl::once_flag once_;
-//
-//  MyInitClass* init() const {
-//    absl::call_once(once_, &MyInitClass::Init, this);
-//    return ptr_;
-//  }
-//
-template <typename Callable, typename... Args>
-void call_once(absl::once_flag& flag, Callable&& fn, Args&&... args);
-
-// once_flag
-//
-// Objects of this type are used to distinguish calls to `call_once()` and
-// ensure the provided function is only invoked once across all threads. This
-// type is not copyable or movable. However, it has a `constexpr`
-// constructor, and is safe to use as a namespace-scoped global variable.
-class once_flag {
- public:
-  constexpr once_flag() : control_(0) {}
-  once_flag(const once_flag&) = delete;
-  once_flag& operator=(const once_flag&) = delete;
-
- private:
-  friend std::atomic<uint32_t>* base_internal::ControlWord(once_flag* flag);
-  std::atomic<uint32_t> control_;
-};
-
-//------------------------------------------------------------------------------
-// End of public interfaces.
-// Implementation details follow.
-//------------------------------------------------------------------------------
-
-namespace base_internal {
-
-// Like call_once, but uses KERNEL_ONLY scheduling. Intended to be used to
-// initialize entities used by the scheduler implementation.
-template <typename Callable, typename... Args>
-void LowLevelCallOnce(absl::once_flag* flag, Callable&& fn, Args&&... args);
-
-// Disables scheduling while on stack when scheduling mode is non-cooperative.
-// No effect for cooperative scheduling modes.
-class SchedulingHelper {
- public:
-  explicit SchedulingHelper(base_internal::SchedulingMode mode) : mode_(mode) {
-    if (mode_ == base_internal::SCHEDULE_KERNEL_ONLY) {
-      guard_result_ = base_internal::SchedulingGuard::DisableRescheduling();
-    }
-  }
-
-  ~SchedulingHelper() {
-    if (mode_ == base_internal::SCHEDULE_KERNEL_ONLY) {
-      base_internal::SchedulingGuard::EnableRescheduling(guard_result_);
-    }
-  }
-
- private:
-  base_internal::SchedulingMode mode_;
-  bool guard_result_;
-};
-
-// Bit patterns for call_once state machine values.  Internal implementation
-// detail, not for use by clients.
-//
-// The bit patterns are arbitrarily chosen from unlikely values, to aid in
-// debugging.  However, kOnceInit must be 0, so that a zero-initialized
-// once_flag will be valid for immediate use.
-enum {
-  kOnceInit = 0,
-  kOnceRunning = 0x65C2937B,
-  kOnceWaiter = 0x05A308D2,
-  // A very small constant is chosen for kOnceDone so that it fit in a single
-  // compare with immediate instruction for most common ISAs.  This is verified
-  // for x86, POWER and ARM.
-  kOnceDone = 221,    // Random Number
-};
-
-template <typename Callable, typename... Args>
-ABSL_ATTRIBUTE_NOINLINE
-void CallOnceImpl(std::atomic<uint32_t>* control,
-                  base_internal::SchedulingMode scheduling_mode, Callable&& fn,
-                  Args&&... args) {
-#ifndef NDEBUG
-  {
-    uint32_t old_control = control->load(std::memory_order_relaxed);
-    if (old_control != kOnceInit &&
-        old_control != kOnceRunning &&
-        old_control != kOnceWaiter &&
-        old_control != kOnceDone) {
-      ABSL_RAW_LOG(FATAL, "Unexpected value for control word: 0x%lx",
-                   static_cast<unsigned long>(old_control));  // NOLINT
-    }
-  }
-#endif  // NDEBUG
-  static const base_internal::SpinLockWaitTransition trans[] = {
-      {kOnceInit, kOnceRunning, true},
-      {kOnceRunning, kOnceWaiter, false},
-      {kOnceDone, kOnceDone, true}};
-
-  // Must do this before potentially modifying control word's state.
-  base_internal::SchedulingHelper maybe_disable_scheduling(scheduling_mode);
-  // Short circuit the simplest case to avoid procedure call overhead.
-  // The base_internal::SpinLockWait() call returns either kOnceInit or
-  // kOnceDone. If it returns kOnceDone, it must have loaded the control word
-  // with std::memory_order_acquire and seen a value of kOnceDone.
-  uint32_t old_control = kOnceInit;
-  if (control->compare_exchange_strong(old_control, kOnceRunning,
-                                       std::memory_order_relaxed) ||
-      base_internal::SpinLockWait(control, ABSL_ARRAYSIZE(trans), trans,
-                                  scheduling_mode) == kOnceInit) {
+ 
+class once_flag; 
+ 
+namespace base_internal { 
+std::atomic<uint32_t>* ControlWord(absl::once_flag* flag); 
+}  // namespace base_internal 
+ 
+// call_once() 
+// 
+// For all invocations using a given `once_flag`, invokes a given `fn` exactly 
+// once across all threads. The first call to `call_once()` with a particular 
+// `once_flag` argument (that does not throw an exception) will run the 
+// specified function with the provided `args`; other calls with the same 
+// `once_flag` argument will not run the function, but will wait 
+// for the provided function to finish running (if it is still running). 
+// 
+// This mechanism provides a safe, simple, and fast mechanism for one-time 
+// initialization in a multi-threaded process. 
+// 
+// Example: 
+// 
+// class MyInitClass { 
+//  public: 
+//  ... 
+//  mutable absl::once_flag once_; 
+// 
+//  MyInitClass* init() const { 
+//    absl::call_once(once_, &MyInitClass::Init, this); 
+//    return ptr_; 
+//  } 
+// 
+template <typename Callable, typename... Args> 
+void call_once(absl::once_flag& flag, Callable&& fn, Args&&... args); 
+ 
+// once_flag 
+// 
+// Objects of this type are used to distinguish calls to `call_once()` and 
+// ensure the provided function is only invoked once across all threads. This 
+// type is not copyable or movable. However, it has a `constexpr` 
+// constructor, and is safe to use as a namespace-scoped global variable. 
+class once_flag { 
+ public: 
+  constexpr once_flag() : control_(0) {} 
+  once_flag(const once_flag&) = delete; 
+  once_flag& operator=(const once_flag&) = delete; 
+ 
+ private: 
+  friend std::atomic<uint32_t>* base_internal::ControlWord(once_flag* flag); 
+  std::atomic<uint32_t> control_; 
+}; 
+ 
+//------------------------------------------------------------------------------ 
+// End of public interfaces. 
+// Implementation details follow. 
+//------------------------------------------------------------------------------ 
+ 
+namespace base_internal { 
+ 
+// Like call_once, but uses KERNEL_ONLY scheduling. Intended to be used to 
+// initialize entities used by the scheduler implementation. 
+template <typename Callable, typename... Args> 
+void LowLevelCallOnce(absl::once_flag* flag, Callable&& fn, Args&&... args); 
+ 
+// Disables scheduling while on stack when scheduling mode is non-cooperative. 
+// No effect for cooperative scheduling modes. 
+class SchedulingHelper { 
+ public: 
+  explicit SchedulingHelper(base_internal::SchedulingMode mode) : mode_(mode) { 
+    if (mode_ == base_internal::SCHEDULE_KERNEL_ONLY) { 
+      guard_result_ = base_internal::SchedulingGuard::DisableRescheduling(); 
+    } 
+  } 
+ 
+  ~SchedulingHelper() { 
+    if (mode_ == base_internal::SCHEDULE_KERNEL_ONLY) { 
+      base_internal::SchedulingGuard::EnableRescheduling(guard_result_); 
+    } 
+  } 
+ 
+ private: 
+  base_internal::SchedulingMode mode_; 
+  bool guard_result_; 
+}; 
+ 
+// Bit patterns for call_once state machine values.  Internal implementation 
+// detail, not for use by clients. 
+// 
+// The bit patterns are arbitrarily chosen from unlikely values, to aid in 
+// debugging.  However, kOnceInit must be 0, so that a zero-initialized 
+// once_flag will be valid for immediate use. 
+enum { 
+  kOnceInit = 0, 
+  kOnceRunning = 0x65C2937B, 
+  kOnceWaiter = 0x05A308D2, 
+  // A very small constant is chosen for kOnceDone so that it fit in a single 
+  // compare with immediate instruction for most common ISAs.  This is verified 
+  // for x86, POWER and ARM. 
+  kOnceDone = 221,    // Random Number 
+}; 
+ 
+template <typename Callable, typename... Args> 
+ABSL_ATTRIBUTE_NOINLINE 
+void CallOnceImpl(std::atomic<uint32_t>* control, 
+                  base_internal::SchedulingMode scheduling_mode, Callable&& fn, 
+                  Args&&... args) { 
+#ifndef NDEBUG 
+  { 
+    uint32_t old_control = control->load(std::memory_order_relaxed); 
+    if (old_control != kOnceInit && 
+        old_control != kOnceRunning && 
+        old_control != kOnceWaiter && 
+        old_control != kOnceDone) { 
+      ABSL_RAW_LOG(FATAL, "Unexpected value for control word: 0x%lx", 
+                   static_cast<unsigned long>(old_control));  // NOLINT 
+    } 
+  } 
+#endif  // NDEBUG 
+  static const base_internal::SpinLockWaitTransition trans[] = { 
+      {kOnceInit, kOnceRunning, true}, 
+      {kOnceRunning, kOnceWaiter, false}, 
+      {kOnceDone, kOnceDone, true}}; 
+ 
+  // Must do this before potentially modifying control word's state. 
+  base_internal::SchedulingHelper maybe_disable_scheduling(scheduling_mode); 
+  // Short circuit the simplest case to avoid procedure call overhead. 
+  // The base_internal::SpinLockWait() call returns either kOnceInit or 
+  // kOnceDone. If it returns kOnceDone, it must have loaded the control word 
+  // with std::memory_order_acquire and seen a value of kOnceDone. 
+  uint32_t old_control = kOnceInit; 
+  if (control->compare_exchange_strong(old_control, kOnceRunning, 
+                                       std::memory_order_relaxed) || 
+      base_internal::SpinLockWait(control, ABSL_ARRAYSIZE(trans), trans, 
+                                  scheduling_mode) == kOnceInit) { 
     base_internal::invoke(std::forward<Callable>(fn),
-                          std::forward<Args>(args)...);
+                          std::forward<Args>(args)...); 
     old_control =
         control->exchange(base_internal::kOnceDone, std::memory_order_release);
-    if (old_control == base_internal::kOnceWaiter) {
-      base_internal::SpinLockWake(control, true);
-    }
-  }  // else *control is already kOnceDone
-}
-
-inline std::atomic<uint32_t>* ControlWord(once_flag* flag) {
-  return &flag->control_;
-}
-
-template <typename Callable, typename... Args>
-void LowLevelCallOnce(absl::once_flag* flag, Callable&& fn, Args&&... args) {
-  std::atomic<uint32_t>* once = base_internal::ControlWord(flag);
-  uint32_t s = once->load(std::memory_order_acquire);
-  if (ABSL_PREDICT_FALSE(s != base_internal::kOnceDone)) {
-    base_internal::CallOnceImpl(once, base_internal::SCHEDULE_KERNEL_ONLY,
-                                std::forward<Callable>(fn),
-                                std::forward<Args>(args)...);
-  }
-}
-
-}  // namespace base_internal
-
-template <typename Callable, typename... Args>
-void call_once(absl::once_flag& flag, Callable&& fn, Args&&... args) {
-  std::atomic<uint32_t>* once = base_internal::ControlWord(&flag);
-  uint32_t s = once->load(std::memory_order_acquire);
-  if (ABSL_PREDICT_FALSE(s != base_internal::kOnceDone)) {
-    base_internal::CallOnceImpl(
-        once, base_internal::SCHEDULE_COOPERATIVE_AND_KERNEL,
-        std::forward<Callable>(fn), std::forward<Args>(args)...);
-  }
-}
-
+    if (old_control == base_internal::kOnceWaiter) { 
+      base_internal::SpinLockWake(control, true); 
+    } 
+  }  // else *control is already kOnceDone 
+} 
+ 
+inline std::atomic<uint32_t>* ControlWord(once_flag* flag) { 
+  return &flag->control_; 
+} 
+ 
+template <typename Callable, typename... Args> 
+void LowLevelCallOnce(absl::once_flag* flag, Callable&& fn, Args&&... args) { 
+  std::atomic<uint32_t>* once = base_internal::ControlWord(flag); 
+  uint32_t s = once->load(std::memory_order_acquire); 
+  if (ABSL_PREDICT_FALSE(s != base_internal::kOnceDone)) { 
+    base_internal::CallOnceImpl(once, base_internal::SCHEDULE_KERNEL_ONLY, 
+                                std::forward<Callable>(fn), 
+                                std::forward<Args>(args)...); 
+  } 
+} 
+ 
+}  // namespace base_internal 
+ 
+template <typename Callable, typename... Args> 
+void call_once(absl::once_flag& flag, Callable&& fn, Args&&... args) { 
+  std::atomic<uint32_t>* once = base_internal::ControlWord(&flag); 
+  uint32_t s = once->load(std::memory_order_acquire); 
+  if (ABSL_PREDICT_FALSE(s != base_internal::kOnceDone)) { 
+    base_internal::CallOnceImpl( 
+        once, base_internal::SCHEDULE_COOPERATIVE_AND_KERNEL, 
+        std::forward<Callable>(fn), std::forward<Args>(args)...); 
+  } 
+} 
+ 
 ABSL_NAMESPACE_END
-}  // namespace absl
-
-#endif  // ABSL_BASE_CALL_ONCE_H_
+}  // namespace absl 
+ 
+#endif  // ABSL_BASE_CALL_ONCE_H_