llvm/llvm/include/llvm/Support/ThreadSafeAllocator.h

//===- ThreadSafeAllocator.h ------------------------------------*- 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
//
//===----------------------------------------------------------------------===//

#ifndef LLVM_SUPPORT_THREADSAFEALLOCATOR_H
#define LLVM_SUPPORT_THREADSAFEALLOCATOR_H

#include "llvm/ADT/STLExtras.h"
#include "llvm/Support/Allocator.h"
#include <atomic>

namespace llvm {

/// Thread-safe allocator adaptor. Uses a spin lock on the assumption that
/// contention here is extremely rare.
///
/// TODO: Using a spin lock on every allocation can be quite expensive when
/// contention is high. Since this is mainly used for BumpPtrAllocator and
/// SpecificBumpPtrAllocator, it'd be better to have a specific thread-safe
/// BumpPtrAllocator implementation that only use a fair lock when allocating a
/// new slab but otherwise using atomic and be lock-free.
template <class AllocatorType> class ThreadSafeAllocator { … };

} // namespace llvm

#endif // LLVM_SUPPORT_THREADSAFEALLOCATOR_H