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Factor out some common code, fix more typoes, and add a memory fence that might be needed.

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llvm-svn: 71853
This commit is contained in:
Owen Anderson 2009-05-15 08:22:07 +00:00
parent c69f0d9a11
commit f77567f7ac
1 changed files with 16 additions and 32 deletions
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48
include/llvm/Support/ManagedStatic.h
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@ -51,51 +51,35 @@ public:
/// ///
template<class C> template<class C>
class ManagedStatic : public ManagedStaticBase { class ManagedStatic : public ManagedStaticBase {
private:
void checkInit() {
sys::cas_flag OldFlag = sys::CompareAndSwap(&InitFlag, 1, 0);
if (OldFlag == 0) {
LazyInit();
sys::MemoryFence();
InitFlag = 2;
} else if (OldFlag == 1) {
while (InitFlag == 1) ;
sys::MemoryFence();
}
}
public: public:
// Accessors. // Accessors.
C &operator*() { C &operator*() {
sys::cas_flag OldFlag = sys::CompareAndSwap(&InitFlag, 1, 0); checkInit();
if (OldFlag == 0) {
LazyInit();
sys::MemoryFence();
InitFlag = 2;
} else if (OldFlag == 1)
while (OldFlag == 1) ;
return *static_cast<C*>(Ptr); return *static_cast<C*>(Ptr);
} }
C *operator->() { C *operator->() {
sys::cas_flag OldFlag = sys::CompareAndSwap(&InitFlag, 1, 0); checkInit();
if (OldFlag == 0) {
LazyInit();
sys::MemoryFence();
InitFlag = 2;
} else if (OldFlag == 1)
while (OldFlag == 1) ;
return static_cast<C*>(Ptr); return static_cast<C*>(Ptr);
} }
const C &operator*() const { const C &operator*() const {
sys::cas_flag OldFlag = sys::CompareAndSwap(&InitFlag, 1, 0); checkInit();
if (OldFlag == 0) {
LazyInit();
sys::MemoryFence();
InitFlag = 2;
} else if (OldFlag == 1)
while (InitFlag == 1) ;
return *static_cast<C*>(Ptr); return *static_cast<C*>(Ptr);
} }
const C *operator->() const { const C *operator->() const {
sys::cas_flag OldFlag = sys::CompareAndSwap(&InitFlag, 1, 0); checkInit();
if (OldFlag == 0) {
LazyInit();
sys::MemoryFence();
InitFlag = 2;
} else if (OldFlag == 1)
while (OldFlag == 1) ;
return static_cast<C*>(Ptr); return static_cast<C*>(Ptr);
} }