63 lines
2.1 KiB
C
63 lines
2.1 KiB
C
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//===- 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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