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[Reproducer] Disable parallel module import in SwiftASTContext during replay #211

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Merged
merged 1 commit into from
Nov 6, 2019
Merged

[Reproducer] Disable parallel module import in SwiftASTContext during replay #211

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5 changes: 4 additions & 1 deletion lldb/source/Symbol/SwiftASTContext.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -1948,7 +1948,10 @@ lldb::TypeSystemSP SwiftASTContext::CreateInstance(lldb::LanguageType language,
// the Clang modules that were imported in this module. This can
// be a lot of work (potentially ten seconds per module), but it
// can be performed in parallel.
llvm::ThreadPool pool;
const unsigned threads = repro::Reproducer::Instance().IsReplaying()
? 1
: llvm::hardware_concurrency();
llvm::ThreadPool pool(threads);
for (size_t mi = 0; mi != num_images; ++mi) {
auto module_sp = target.GetImages().GetModuleAtIndex(mi);
pool.async([=] {
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