Delete dead code.

llvm-svn: 317633

lld/Common/ErrorHandler.cpp

@@ -46,7 +46,6 @@ ErrorHandler &lld::errorHandler() {
 }
 
 void lld::exitLld(int Val) {
-  waitForBackgroundThreads();
   // Dealloc/destroy ManagedStatic variables before calling
   // _exit(). In a non-LTO build, this is a nop. In an LTO
   // build allows us to get the output of -time-passes.

lld/Common/Threads.cpp

@@ -8,25 +8,5 @@
 //===----------------------------------------------------------------------===//
 
 #include "lld/Common/Threads.h"
-#include <thread>
-#include <vector>
-
-static std::vector<std::thread> Threads;
 
 bool lld::ThreadsEnabled = true;
-
-// Runs a given function in a new thread.
-void lld::runBackground(std::function<void()> Fn) {
-  Threads.emplace_back(Fn);
-}
-
-// Wait for all threads spawned for runBackground() to finish.
-//
-// You need to call this function from the main thread before exiting
-// because it is not defined what will happen to non-main threads when
-// the main thread exits.
-void lld::waitForBackgroundThreads() {
-  for (std::thread &T : Threads)
-    if (T.joinable())
-      T.join();
-}

lld/ELF/Driver.cpp

@@ -93,7 +93,6 @@ bool elf::link(ArrayRef<const char *> Args, bool CanExitEarly,
   Config->Argv = {Args.begin(), Args.end()};
 
   Driver->main(Args, CanExitEarly);
-  waitForBackgroundThreads();
 
   // Exit immediately if we don't need to return to the caller.
   // This saves time because the overhead of calling destructors

lld/include/lld/Common/Threads.h

@@ -81,9 +81,6 @@ inline void parallelForEachN(size_t Begin, size_t End,
     for_each_n(llvm::parallel::seq, Begin, End, Fn);
 }
 
-void runBackground(std::function<void()> Fn);
-void waitForBackgroundThreads();
-
 } // namespace lld
 
 #endif