[PATCH] D150184: [ORC] Fix race-condition in RTDyldObjectLinkingLayer::onObjEmit.

[Moritz Kroll via Phabricator via llvm-commits]

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The blocking version of ExecutionSession::lookup() uses std::promise() to wait
for the result of a compilation.
In RTDyldObjectLinkingLayer::onObjEmit() another thread could have compiled
the object and notify the promise via R.notifyEmitted(), that the object was emitted, before
the memory manager of the object was registered with the resource tracker.
Thus the code could already be executed and the object removed from the
JIT, before the memory manager was registered, leading to a errors
about a defunct resource tracker.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D150184

Files:
  llvm/lib/ExecutionEngine/Orc/RTDyldObjectLinkingLayer.cpp
  llvm/unittests/ExecutionEngine/Orc/RTDyldObjectLinkingLayerTest.cpp

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