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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
85 lines
2.3 KiB
C++
85 lines
2.3 KiB
C++
//===-- ManagedStatic.cpp - Static Global wrapper -------------------------===//
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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 implements the ManagedStatic class and llvm_shutdown().
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Support/ManagedStatic.h"
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#include "llvm/Config/config.h"
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#include "llvm/Support/Mutex.h"
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#include "llvm/Support/MutexGuard.h"
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#include "llvm/Support/Threading.h"
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#include <cassert>
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using namespace llvm;
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static const ManagedStaticBase *StaticList = nullptr;
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static sys::Mutex *ManagedStaticMutex = nullptr;
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static llvm::once_flag mutex_init_flag;
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static void initializeMutex() {
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ManagedStaticMutex = new sys::Mutex();
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}
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static sys::Mutex* getManagedStaticMutex() {
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llvm::call_once(mutex_init_flag, initializeMutex);
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return ManagedStaticMutex;
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}
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void ManagedStaticBase::RegisterManagedStatic(void *(*Creator)(),
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void (*Deleter)(void*)) const {
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assert(Creator);
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if (llvm_is_multithreaded()) {
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MutexGuard Lock(*getManagedStaticMutex());
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if (!Ptr.load(std::memory_order_relaxed)) {
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void *Tmp = Creator();
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Ptr.store(Tmp, std::memory_order_release);
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DeleterFn = Deleter;
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// Add to list of managed statics.
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Next = StaticList;
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StaticList = this;
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}
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} else {
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assert(!Ptr && !DeleterFn && !Next &&
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"Partially initialized ManagedStatic!?");
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Ptr = Creator();
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DeleterFn = Deleter;
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// Add to list of managed statics.
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Next = StaticList;
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StaticList = this;
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}
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}
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void ManagedStaticBase::destroy() const {
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assert(DeleterFn && "ManagedStatic not initialized correctly!");
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assert(StaticList == this &&
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"Not destroyed in reverse order of construction?");
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// Unlink from list.
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StaticList = Next;
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Next = nullptr;
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// Destroy memory.
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DeleterFn(Ptr);
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// Cleanup.
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Ptr = nullptr;
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DeleterFn = nullptr;
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}
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/// llvm_shutdown - Deallocate and destroy all ManagedStatic variables.
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void llvm::llvm_shutdown() {
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MutexGuard Lock(*getManagedStaticMutex());
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while (StaticList)
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StaticList->destroy();
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}
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