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Add llvm_start_multithreaded(), which starts up the LLVM internals in thread-safe mode. Provide double-check locking

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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
This commit is contained in:
Owen Anderson
2009-05-20 00:39:20 +00:00
parent 513fae2db5
commit b4d97b78df
2 changed files with 78 additions and 19 deletions
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44
include/llvm/Support/ManagedStatic.h
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@@ -14,8 +14,16 @@
#ifndef LLVM_SUPPORT_MANAGED_STATIC_H
#define LLVM_SUPPORT_MANAGED_STATIC_H
#include "llvm/System/Atomic.h"
namespace llvm {
/// object_creator - Helper method for ManagedStatic.
template<class C>
void* object_creator() {
return new C();
}
/// object_deleter - Helper method for ManagedStatic.
///
template<class C>
@@ -32,7 +40,7 @@ protected:
mutable void (*DeleterFn)(void*);
mutable const ManagedStaticBase *Next;
void RegisterManagedStatic(void *ObjPtr, void (*deleter)(void*)) const;
void RegisterManagedStatic(void *(*creator)(), void (*deleter)(void*)) const;
public:
/// isConstructed - Return true if this object has not been created yet.
bool isConstructed() const { return Ptr != 0; }
@@ -51,25 +59,32 @@ public:
// Accessors.
C &operator*() {
if (!Ptr) LazyInit();
void* tmp = Ptr;
sys::MemoryFence();
if (!tmp) RegisterManagedStatic(object_creator<C>, object_deleter<C>);
return *static_cast<C*>(Ptr);
}
C *operator->() {
if (!Ptr) LazyInit();
void* tmp = Ptr;
sys::MemoryFence();
if (!tmp) RegisterManagedStatic(object_creator<C>, object_deleter<C>);
return static_cast<C*>(Ptr);
}
const C &operator*() const {
if (!Ptr) LazyInit();
void* tmp = Ptr;
sys::MemoryFence();
if (!tmp) RegisterManagedStatic(object_creator<C>, object_deleter<C>);
return *static_cast<C*>(Ptr);
}
const C *operator->() const {
if (!Ptr) LazyInit();
return static_cast<C*>(Ptr);
}
void* tmp = Ptr;
sys::MemoryFence();
if (!tmp) RegisterManagedStatic(object_creator<C>, object_deleter<C>);
public:
void LazyInit() const {
RegisterManagedStatic(new C(), object_deleter<C>);
return static_cast<C*>(Ptr);
}
};
@@ -80,6 +95,10 @@ public:
};
/// llvm_start_multithreaded - Allocate and initialize structures needed to
/// make LLVM safe for multithreading.
void llvm_start_multithreaded();
/// llvm_shutdown - Deallocate and destroy all ManagedStatic variables.
void llvm_shutdown();
@@ -87,7 +106,10 @@ void llvm_shutdown();
/// llvm_shutdown_obj - This is a simple helper class that calls
/// llvm_shutdown() when it is destroyed.
struct llvm_shutdown_obj {
llvm_shutdown_obj() {}
llvm_shutdown_obj() { }
explicit llvm_shutdown_obj(bool multithreaded) {
if (multithreaded) llvm_start_multithreaded();
}
~llvm_shutdown_obj() { llvm_shutdown(); }
};