[llvm] r284283 - hardware_physical_concurrency() should return 1 when LLVM is built with LLVM_ENABLE_THREADS=OFF

[Mehdi Amini via llvm-commits]

Author: mehdi_amini
Date: Fri Oct 14 16:32:35 2016
New Revision: 284283

URL: http://llvm.org/viewvc/llvm-project?rev=284283&view=rev
Log:
hardware_physical_concurrency() should return 1 when LLVM is built with LLVM_ENABLE_THREADS=OFF

Modified:
    llvm/trunk/include/llvm/Support/Threading.h
    llvm/trunk/lib/Support/Threading.cpp

Modified: llvm/trunk/include/llvm/Support/Threading.h
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/include/llvm/Support/Threading.h?rev=284283&r1=284282&r2=284283&view=diff
==============================================================================
--- llvm/trunk/include/llvm/Support/Threading.h (original)
+++ llvm/trunk/include/llvm/Support/Threading.h Fri Oct 14 16:32:35 2016
@@ -118,6 +118,7 @@ namespace llvm {
 
   /// Get the amount of currency based on physical cores, if available for the
   /// host system, otherwise falls back to thread::hardware_concurrency().
+  /// Returns 1 when LLVM is configured with LLVM_ENABLE_THREADS=OFF
   unsigned hardware_physical_concurrency();
 }
 

Modified: llvm/trunk/lib/Support/Threading.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Support/Threading.cpp?rev=284283&r1=284282&r2=284283&view=diff
==============================================================================
--- llvm/trunk/lib/Support/Threading.cpp (original)
+++ llvm/trunk/lib/Support/Threading.cpp Fri Oct 14 16:32:35 2016
@@ -119,6 +119,9 @@ void llvm::llvm_execute_on_thread(void (
 #endif
 
 unsigned llvm::hardware_physical_concurrency() {
+#if !LLVM_ENABLE_THREADS
+  return 1;
+#endif
   int NumPhysical = sys::getHostNumPhysicalCores();
   if (NumPhysical == -1)
     return thread::hardware_concurrency();