Ref T570 Measure sortHint using true CPU time routines.

src/blackmisc/cputime.cpp

@@ -0,0 +1,76 @@
+/* Copyright (C) 2019
+ * swift Project Community / Contributors
+ *
+ * This file is part of swift project. It is subject to the license terms in the LICENSE file found in the top-level
+ * directory of this distribution. No part of swift project, including this file, may be copied, modified, propagated,
+ * or distributed except according to the terms contained in the LICENSE file.
+ */
+
+#include "blackmisc/cputime.h"
+#include <QtGlobal>
+
+#if defined(Q_OS_WIN32)
+#include <windows.h>
+#elif defined(Q_OS_UNIX)
+#include <time.h>
+#endif
+
+namespace BlackMisc
+{
+
+#if defined(Q_OS_WIN32)
+
+    static int getCpuTimeMs(const FILETIME &kernelTime, const FILETIME &userTime)
+    {
+        const ULARGE_INTEGER kernel { { kernelTime.dwLowDateTime, kernelTime.dwHighDateTime } };
+        const ULARGE_INTEGER user { { userTime.dwLowDateTime, userTime.dwHighDateTime } };
+        const quint64 usecs = (kernel.QuadPart + user.QuadPart) / 10ull;
+        return static_cast<int>(usecs / 1000ull);
+    }
+    int getProcessCpuTimeMs()
+    {
+        FILETIME creationTime, exitTime, kernelTime, userTime;
+        GetProcessTimes(GetCurrentProcess(), &creationTime, &exitTime, &kernelTime, &userTime);
+        return getCpuTimeMs(kernelTime, userTime);
+    }
+    int getThreadCpuTimeMs()
+    {
+        FILETIME creationTime, exitTime, kernelTime, userTime;
+        GetThreadTimes(GetCurrentThread(), &creationTime, &exitTime, &kernelTime, &userTime);
+        return getCpuTimeMs(kernelTime, userTime);
+    }
+
+#elif defined(Q_OS_UNIX)
+
+    static int getCpuTimeMs(const timespec &ts)
+    {
+        const double secs = static_cast<double>(ts.tv_sec) + static_cast<double>(ts.tv_nsec) / 1e9;
+        return static_cast<int>(secs * 1000);
+    }
+    int getProcessCpuTimeMs()
+    {
+        timespec ts {};
+        clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &ts);
+        return getCpuTimeMs(ts);
+    }
+    int getThreadCpuTimeMs()
+    {
+        timespec ts {};
+        clock_gettime(CLOCK_THREAD_CPUTIME_ID, &ts);
+        return getCpuTimeMs(ts);
+    }
+
+#else // Q_OS_UNIX
+
+    int getProcessCpuTimeMs()
+    {
+        return 0; // not implemented
+    }
+    int getThreadCpuTimeMs()
+    {
+        return 0; // not implemented
+    }
+
+#endif
+
+}

src/blackmisc/cputime.h

@@ -0,0 +1,30 @@
+/* Copyright (C) 2019
+ * swift Project Community / Contributors
+ *
+ * This file is part of swift project. It is subject to the license terms in the LICENSE file found in the top-level
+ * directory of this distribution. No part of swift project, including this file, may be copied, modified, propagated,
+ * or distributed except according to the terms contained in the LICENSE file.
+ */
+
+//! \file
+
+#ifndef BLACKMISC_CPUTIME_H
+#define BLACKMISC_CPUTIME_H
+
+#include "blackmisc/blackmiscexport.h"
+
+namespace BlackMisc
+{
+    /*!
+     * Get the time in milliseconds that the CPU has spent executing the current process.
+     * This is the sum of getThreadCpuTimeMs() for all threads.
+     */
+    BLACKMISC_EXPORT int getProcessCpuTimeMs();
+
+    /*!
+     * Get the time in milliseconds that the CPU has spent executing the current thread.
+     */
+    BLACKMISC_EXPORT int getThreadCpuTimeMs();
+}
+
+#endif