Use the new ThreadPoolInterface base class instead of the concrete implementation (NFC)

bolt/include/bolt/Core/ParallelUtilities.h

@@ -49,8 +49,8 @@ enum SchedulingPolicy {
   SP_BB_QUADRATIC,   /// cost is estimated by the square of the BB count
 };
 
-/// Return the managed thread pool and initialize it if not initiliazed.
-ThreadPool &getThreadPool();
+/// Return the managed thread pool and initialize it if not initialized.
+ThreadPoolInterface &getThreadPool();
 
 /// Perform the work on each BinaryFunction except those that are accepted
 /// by SkipPredicate, scheduling heuristic is based on SchedPolicy.

bolt/lib/Core/ParallelUtilities.cpp

@@ -102,7 +102,7 @@ inline unsigned estimateTotalCost(const BinaryContext &BC,
 
 } // namespace
 
-ThreadPool &getThreadPool() {
+ThreadPoolInterface &getThreadPool() {
   if (ThreadPoolPtr.get())
     return *ThreadPoolPtr;
 
@@ -145,7 +145,7 @@ void runOnEachFunction(BinaryContext &BC, SchedulingPolicy SchedPolicy,
       TotalCost > BlocksCount ? TotalCost / BlocksCount : 1;
 
   // Divide work into blocks of equal cost
-  ThreadPool &Pool = getThreadPool();
+  ThreadPoolInterface &Pool = getThreadPool();
   auto BlockBegin = BC.getBinaryFunctions().begin();
   unsigned CurrentCost = 0;
 
@@ -202,7 +202,7 @@ void runOnEachFunctionWithUniqueAllocId(
       TotalCost > BlocksCount ? TotalCost / BlocksCount : 1;
 
   // Divide work into blocks of equal cost
-  ThreadPool &Pool = getThreadPool();
+  ThreadPoolInterface &Pool = getThreadPool();
   auto BlockBegin = BC.getBinaryFunctions().begin();
   unsigned CurrentCost = 0;
   unsigned AllocId = 1;

bolt/lib/Passes/IdenticalCodeFolding.cpp

@@ -397,7 +397,7 @@ Error IdenticalCodeFolding::runOnFunctions(BinaryContext &BC) {
     Timer SinglePass("single fold pass", "single fold pass");
     LLVM_DEBUG(SinglePass.startTimer());
 
-    ThreadPool *ThPool;
+    ThreadPoolInterface *ThPool;
     if (!opts::NoThreads)
       ThPool = &ParallelUtilities::getThreadPool();
 

bolt/lib/Rewrite/DWARFRewriter.cpp

@@ -784,7 +784,7 @@ void DWARFRewriter::updateDebugInfo() {
     }
   } else {
     // Update unit debug info in parallel
-    ThreadPool &ThreadPool = ParallelUtilities::getThreadPool();
+    ThreadPoolInterface &ThreadPool = ParallelUtilities::getThreadPool();
     for (std::unique_ptr<DWARFUnit> &CU : BC.DwCtx->compile_units())
       ThreadPool.async(processUnitDIE, CU.get(), &DIEBlder);
     ThreadPool.wait();

llvm/tools/llvm-reduce/deltas/Delta.cpp

@@ -219,7 +219,7 @@ void llvm::runDeltaPass(TestRunner &Test, ReductionFunc ExtractChunksFromModule,
   }
 
   std::atomic<bool> AnyReduced;
-  std::unique_ptr<ThreadPool> ChunkThreadPoolPtr;
+  std::unique_ptr<ThreadPoolInterface> ChunkThreadPoolPtr;
   if (NumJobs > 1)
     ChunkThreadPoolPtr =
         std::make_unique<ThreadPool>(hardware_concurrency(NumJobs));
@@ -251,7 +251,7 @@ void llvm::runDeltaPass(TestRunner &Test, ReductionFunc ExtractChunksFromModule,
         unsigned NumInitialTasks = std::min(WorkLeft, unsigned(NumJobs));
         unsigned NumChunksProcessed = 0;
 
-        ThreadPool &ChunkThreadPool = *ChunkThreadPoolPtr;
+        ThreadPoolInterface &ChunkThreadPool = *ChunkThreadPoolPtr;
         assert(TaskQueue.empty());
 
         AnyReduced = false;

mlir/lib/ExecutionEngine/AsyncRuntime.cpp

@@ -57,7 +57,7 @@ class AsyncRuntime {
     return numRefCountedObjects.load(std::memory_order_relaxed);
   }
 
-  llvm::ThreadPool &getThreadPool() { return threadPool; }
+  llvm::ThreadPoolInterface &getThreadPool() { return threadPool; }
 
 private:
   friend class RefCounted;