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Add llvm_start_multithreaded(), which starts up the LLVM internals in thread-safe mode. Provide double-check locking
initialization of ManagedStatic's when running in thread-safe mode. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@72151 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -14,8 +14,16 @@
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#ifndef LLVM_SUPPORT_MANAGED_STATIC_H
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#ifndef LLVM_SUPPORT_MANAGED_STATIC_H
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#define LLVM_SUPPORT_MANAGED_STATIC_H
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#define LLVM_SUPPORT_MANAGED_STATIC_H
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#include "llvm/System/Atomic.h"
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namespace llvm {
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namespace llvm {
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/// object_creator - Helper method for ManagedStatic.
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template<class C>
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void* object_creator() {
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return new C();
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}
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/// object_deleter - Helper method for ManagedStatic.
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/// object_deleter - Helper method for ManagedStatic.
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///
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///
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template<class C>
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template<class C>
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@ -32,7 +40,7 @@ protected:
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mutable void (*DeleterFn)(void*);
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mutable void (*DeleterFn)(void*);
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mutable const ManagedStaticBase *Next;
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mutable const ManagedStaticBase *Next;
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void RegisterManagedStatic(void *ObjPtr, void (*deleter)(void*)) const;
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void RegisterManagedStatic(void *(*creator)(), void (*deleter)(void*)) const;
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public:
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public:
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/// isConstructed - Return true if this object has not been created yet.
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/// isConstructed - Return true if this object has not been created yet.
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bool isConstructed() const { return Ptr != 0; }
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bool isConstructed() const { return Ptr != 0; }
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@ -51,25 +59,32 @@ public:
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// Accessors.
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// Accessors.
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C &operator*() {
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C &operator*() {
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if (!Ptr) LazyInit();
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void* tmp = Ptr;
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sys::MemoryFence();
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if (!tmp) RegisterManagedStatic(object_creator<C>, object_deleter<C>);
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return *static_cast<C*>(Ptr);
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return *static_cast<C*>(Ptr);
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}
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}
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C *operator->() {
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C *operator->() {
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if (!Ptr) LazyInit();
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void* tmp = Ptr;
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sys::MemoryFence();
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if (!tmp) RegisterManagedStatic(object_creator<C>, object_deleter<C>);
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return static_cast<C*>(Ptr);
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return static_cast<C*>(Ptr);
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}
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}
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const C &operator*() const {
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const C &operator*() const {
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if (!Ptr) LazyInit();
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void* tmp = Ptr;
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sys::MemoryFence();
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if (!tmp) RegisterManagedStatic(object_creator<C>, object_deleter<C>);
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return *static_cast<C*>(Ptr);
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return *static_cast<C*>(Ptr);
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}
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}
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const C *operator->() const {
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const C *operator->() const {
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if (!Ptr) LazyInit();
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void* tmp = Ptr;
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return static_cast<C*>(Ptr);
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sys::MemoryFence();
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}
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if (!tmp) RegisterManagedStatic(object_creator<C>, object_deleter<C>);
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public:
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return static_cast<C*>(Ptr);
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void LazyInit() const {
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RegisterManagedStatic(new C(), object_deleter<C>);
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}
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}
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};
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};
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@ -80,6 +95,10 @@ public:
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};
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};
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/// llvm_start_multithreaded - Allocate and initialize structures needed to
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/// make LLVM safe for multithreading.
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void llvm_start_multithreaded();
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/// llvm_shutdown - Deallocate and destroy all ManagedStatic variables.
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/// llvm_shutdown - Deallocate and destroy all ManagedStatic variables.
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void llvm_shutdown();
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void llvm_shutdown();
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@ -87,7 +106,10 @@ void llvm_shutdown();
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/// llvm_shutdown_obj - This is a simple helper class that calls
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/// llvm_shutdown_obj - This is a simple helper class that calls
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/// llvm_shutdown() when it is destroyed.
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/// llvm_shutdown() when it is destroyed.
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struct llvm_shutdown_obj {
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struct llvm_shutdown_obj {
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llvm_shutdown_obj() {}
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llvm_shutdown_obj() { }
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explicit llvm_shutdown_obj(bool multithreaded) {
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if (multithreaded) llvm_start_multithreaded();
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}
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~llvm_shutdown_obj() { llvm_shutdown(); }
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~llvm_shutdown_obj() { llvm_shutdown(); }
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};
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};
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@ -12,21 +12,44 @@
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//===----------------------------------------------------------------------===//
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//===----------------------------------------------------------------------===//
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#include "llvm/Support/ManagedStatic.h"
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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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#include <cassert>
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using namespace llvm;
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using namespace llvm;
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static const ManagedStaticBase *StaticList = 0;
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static const ManagedStaticBase *StaticList = 0;
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void ManagedStaticBase::RegisterManagedStatic(void *ObjPtr,
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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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void (*Deleter)(void*)) const {
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assert(Ptr == 0 && DeleterFn == 0 && Next == 0 &&
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if (ManagedStaticMutex) {
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"Partially init static?");
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ManagedStaticMutex->acquire();
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Ptr = ObjPtr;
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DeleterFn = Deleter;
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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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// Add to list of managed statics.
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Next = StaticList;
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Next = StaticList;
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StaticList = this;
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StaticList = this;
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}
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}
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}
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void ManagedStaticBase::destroy() const {
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void ManagedStaticBase::destroy() const {
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@ -45,9 +68,23 @@ void ManagedStaticBase::destroy() const {
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DeleterFn = 0;
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DeleterFn = 0;
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}
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}
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void 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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#else
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assert(0 && "LLVM built without multithreading support!");
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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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/// llvm_shutdown - Deallocate and destroy all ManagedStatic variables.
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void llvm::llvm_shutdown() {
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void llvm::llvm_shutdown() {
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while (StaticList)
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while (StaticList)
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StaticList->destroy();
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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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}
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