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[ORC] Fix a data race in the lookup function.

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The Error locals need to be protected by a mutex. (This could be fixed by
having the promises / futures contain Expected and Error values, but
MSVC's future implementation does not support this yet).

Hopefully this will fix some of the errors seen on the builders due to
r327474.

llvm-svn: 327477
This commit is contained in:
Lang Hames 2018-03-14 06:25:08 +00:00
parent 738674c4c6
commit f193da763c
1 changed files with 24 additions and 10 deletions
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16
lib/ExecutionEngine/Orc/Core.cpp
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@ -353,21 +353,28 @@ Expected<SymbolMap> lookup(const std::vector<VSO *> &VSOs, SymbolNameSet Names,
#if LLVM_ENABLE_THREADS
// In the threaded case we use promises to return the results.
std::promise<SymbolMap> PromisedResult;
std::mutex ErrMutex;
Error ResolutionError = Error::success();
std::promise<void> PromisedReady;
Error ReadyError = Error::success();
auto OnResolve = [&](Expected<SymbolMap> Result) {
ErrorAsOutParameter _(&ResolutionError);
if (Result)
PromisedResult.set_value(std::move(*Result));
else {
{
ErrorAsOutParameter _(&ResolutionError);
std::lock_guard<std::mutex> Lock(ErrMutex);
ResolutionError = Result.takeError();
}
PromisedResult.set_value(SymbolMap());
}
};
auto OnReady = [&](Error Err) {
if (Err) {
ErrorAsOutParameter _(&ReadyError);
std::lock_guard<std::mutex> Lock(ErrMutex);
ReadyError = std::move(Err);
}
PromisedReady.set_value();
};
#else
@ -416,17 +423,24 @@ Expected<SymbolMap> lookup(const std::vector<VSO *> &VSOs, SymbolNameSet Names,
#if LLVM_ENABLE_THREADS
auto ResultFuture = PromisedResult.get_future();
auto Result = ResultFuture.get();
{
std::lock_guard<std::mutex> Lock(ErrMutex);
if (ResolutionError) {
// ReadyError will never be assigned. Consume the success value.
cantFail(std::move(ReadyError));
return std::move(ResolutionError);
}
}
auto ReadyFuture = PromisedReady.get_future();
ReadyFuture.get();
{
std::lock_guard<std::mutex> Lock(ErrMutex);
if (ReadyError)
return std::move(ReadyError);
}
return std::move(Result);