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-rw-r--r--include/llvm/Support/MutexGuard.h40
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diff --git a/include/llvm/Support/MutexGuard.h b/include/llvm/Support/MutexGuard.h
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--- a/include/llvm/Support/MutexGuard.h
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-//===-- Support/MutexGuard.h - Acquire/Release Mutex In Scope ---*- C++ -*-===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-//
-// This file defines a guard for a block of code that ensures a Mutex is locked
-// upon construction and released upon destruction.
-//
-//===----------------------------------------------------------------------===//
-
-#ifndef LLVM_SUPPORT_MUTEXGUARD_H
-#define LLVM_SUPPORT_MUTEXGUARD_H
-
-#include "llvm/Support/Mutex.h"
-
-namespace llvm {
- /// Instances of this class acquire a given Mutex Lock when constructed and
- /// hold that lock until destruction. The intention is to instantiate one of
- /// these on the stack at the top of some scope to be assured that C++
- /// destruction of the object will always release the Mutex and thus avoid
- /// a host of nasty multi-threading problems in the face of exceptions, etc.
- /// Guard a section of code with a Mutex.
- class MutexGuard {
- sys::Mutex &M;
- MutexGuard(const MutexGuard &) = delete;
- void operator=(const MutexGuard &) = delete;
- public:
- MutexGuard(sys::Mutex &m) : M(m) { M.lock(); }
- ~MutexGuard() { M.unlock(); }
- /// holds - Returns true if this locker instance holds the specified lock.
- /// This is mostly used in assertions to validate that the correct mutex
- /// is held.
- bool holds(const sys::Mutex& lock) const { return &M == &lock; }
- };
-}
-
-#endif // LLVM_SUPPORT_MUTEXGUARD_H