added benchmark utility command `bench` (#298)

currently this implements a way (`zen bench --purge`) to purge the standby lists on Windows. This basically flushes the file system cache and is useful to put your system in a consistent state before running benchmarks

1 files changed, 19 insertions, 0 deletions

diff --git a/src/zencore/thread.cpp b/src/zencore/thread.cpp
index fe81cc786..52b1e5d4e 100644
--- a/src/zencore/thread.cpp
+++ b/src/zencore/thread.cpp
@@ -679,6 +679,25 @@ ProcessHandle::Wait(int TimeoutMs)
 	ThrowLastError("Process::Wait failed"sv);
 }
 
+int
+ProcessHandle::WaitExitCode()
+{
+	Wait(-1);
+
+#if ZEN_PLATFORM_WINDOWS
+	DWORD ExitCode = 0;
+	GetExitCodeProcess(m_ProcessHandle, &ExitCode);
+
+	ZEN_ASSERT(ExitCode != STILL_ACTIVE);
+
+	return ExitCode;
+#else
+	ZEN_NOT_IMPLEMENTED();
+
+	return 0;
+#endif
+}
+
 //////////////////////////////////////////////////////////////////////////
 
 #if !ZEN_PLATFORM_WINDOWS || ZEN_WITH_TESTS