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to reflect the new license. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351636
63 lines
2.1 KiB
C++
63 lines
2.1 KiB
C++
//===- llvm/Support/ThreadLocal.h - Thread Local Data ------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file declares the llvm::sys::ThreadLocal class.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_SUPPORT_THREADLOCAL_H
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#define LLVM_SUPPORT_THREADLOCAL_H
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#include "llvm/Support/DataTypes.h"
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#include "llvm/Support/Threading.h"
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#include <cassert>
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namespace llvm {
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namespace sys {
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// ThreadLocalImpl - Common base class of all ThreadLocal instantiations.
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// YOU SHOULD NEVER USE THIS DIRECTLY.
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class ThreadLocalImpl {
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typedef uint64_t ThreadLocalDataTy;
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/// Platform-specific thread local data.
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///
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/// This is embedded in the class and we avoid malloc'ing/free'ing it,
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/// to make this class more safe for use along with CrashRecoveryContext.
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union {
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char data[sizeof(ThreadLocalDataTy)];
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ThreadLocalDataTy align_data;
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};
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public:
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ThreadLocalImpl();
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virtual ~ThreadLocalImpl();
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void setInstance(const void* d);
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void *getInstance();
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void removeInstance();
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};
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/// ThreadLocal - A class used to abstract thread-local storage. It holds,
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/// for each thread, a pointer a single object of type T.
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template<class T>
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class ThreadLocal : public ThreadLocalImpl {
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public:
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ThreadLocal() : ThreadLocalImpl() { }
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/// get - Fetches a pointer to the object associated with the current
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/// thread. If no object has yet been associated, it returns NULL;
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T* get() { return static_cast<T*>(getInstance()); }
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// set - Associates a pointer to an object with the current thread.
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void set(T* d) { setInstance(d); }
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// erase - Removes the pointer associated with the current thread.
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void erase() { removeInstance(); }
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};
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}
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}
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#endif
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