http://llvm.org/bugs/show_bug.cgi?id=15749
Bug ID: 15749
Summary: llvm::sys::Memory not thread-safe
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: Support Libraries
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
Memory::allocateMappedMemory() has a block-scope static that caches the size of
a page (in both Posix and Windows versions). When LLVM is built by a pre-C++11
compiler (note 1), multiple threads may race on examining and setting the
hidden boolean. In the case of MS Visual Studio this is disastrous because it
sets the flag before setting the value, which results in other threads using
the not-yet-set value.
static const size_t PageSize = Process::GetPageSize();
const size_t NumPages = (NumBytes+PageSize-1)/PageSize;
(1) C++11 says concurrent access must be serialized, previous Standards did
not.
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