forked from OSchip/llvm-project
92 lines
2.3 KiB
C++
92 lines
2.3 KiB
C++
//===-- ManagedStatic.cpp - Static Global wrapper -------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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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/System/Atomic.h"
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#include "llvm/System/Mutex.h"
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#include <cassert>
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using namespace llvm;
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static const ManagedStaticBase *StaticList = 0;
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static sys::Mutex* ManagedStaticMutex = 0;
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void ManagedStaticBase::RegisterManagedStatic(void *(*Creator)(),
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void (*Deleter)(void*)) const {
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if (ManagedStaticMutex) {
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ManagedStaticMutex->acquire();
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if (Ptr == 0) {
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void* tmp = Creator ? Creator() : 0;
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sys::MemoryFence();
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Ptr = tmp;
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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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ManagedStaticMutex->release();
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} else {
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assert(Ptr == 0 && DeleterFn == 0 && Next == 0 &&
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"Partially initialized ManagedStatic!?");
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Ptr = Creator ? Creator() : 0;
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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 = 0;
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// Destroy memory.
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DeleterFn(Ptr);
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// Cleanup.
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Ptr = 0;
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DeleterFn = 0;
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}
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bool llvm::llvm_start_multithreaded() {
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#if LLVM_MULTITHREADED
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assert(ManagedStaticMutex == 0 && "Multithreaded LLVM already initialized!");
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ManagedStaticMutex = new sys::Mutex(true);
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return true;
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#else
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return false;
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#endif
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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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while (StaticList)
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StaticList->destroy();
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if (ManagedStaticMutex) {
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delete ManagedStaticMutex;
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ManagedStaticMutex = 0;
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}
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}
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