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Fix a threaded LLVM bug due the need for operator= on reference counted AttrListImpl's. It might

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be possible to implement this very carefully to allow a lock-free implementation while still
avoiding illegal interleavings, but I haven't been able to figure one out.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@114046 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Owen Anderson 2010-09-16 00:27:35 +00:00
parent f6a129a24b
commit cb86def1c2
1 changed files with 1 additions and 0 deletions
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lib/VMCore/Attributes.cpp
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@ -195,6 +195,7 @@ AttrListPtr::AttrListPtr(const AttrListPtr &P) : AttrList(P.AttrList) {
}
const AttrListPtr &AttrListPtr::operator=(const AttrListPtr &RHS) {
sys::SmartScopedLock<true> Lock(*ALMutex);
if (AttrList == RHS.AttrList) return *this;
if (AttrList) AttrList->DropRef();
AttrList = RHS.AttrList;