mono/utils/mono-proclib-windows.c

   1 /*
   2  * mono-proclib-windows.c: Windows proclib support for Mono.
   3  *
   4  * Copyright 2016 Microsoft
   5  * Licensed under the MIT license. See LICENSE file in the project root for full license information.
   6 */
   7
   8 #include <config.h>
   9 #include <glib.h>
  10
  11 #ifdef HOST_WIN32
  12 #include <windows.h>
  13 #include "mono/utils/mono-proclib.h"
  14
  15 int
  16 mono_process_current_pid ()
  17 {
  18         return (int) GetCurrentProcessId ();
  19 }
  20
  21 /**
  22  * mono_cpu_count:
  23  *
  24  * Return the number of processors on the system.
  25  */
  26 int
  27 mono_cpu_count (void)
  28 {
  29         SYSTEM_INFO info;
  30         GetSystemInfo (&info);
  31         return info.dwNumberOfProcessors;
  32 }
  33
  34 /*
  35  * This function returns the cpu usage in percentage,
  36  * normalized on the number of cores.
  37  *
  38  * Warning : the percentage returned can be > 100%. This
  39  * might happens on systems like Android which, for
  40  * battery and performance reasons, shut down cores and
  41  * lie about the number of active cores.
  42  */
  43 #if G_HAVE_API_SUPPORT(HAVE_CLASSIC_WINAPI_SUPPORT)
  44 gint32
  45 mono_cpu_usage (MonoCpuUsageState *prev)
  46 {
  47         gint32 cpu_usage = 0;
  48         gint64 cpu_total_time;
  49         gint64 cpu_busy_time;
  50         guint64 idle_time;
  51         guint64 kernel_time;
  52         guint64 user_time;
  53
  54         if (!GetSystemTimes ((FILETIME*) &idle_time, (FILETIME*) &kernel_time, (FILETIME*) &user_time)) {
  55                 g_error ("GetSystemTimes() failed, error code is %d\n", GetLastError ());
  56                 return -1;
  57         }
  58
  59         cpu_total_time = (gint64)((user_time - (prev ? prev->user_time : 0)) + (kernel_time - (prev ? prev->kernel_time : 0)));
  60         cpu_busy_time = (gint64)(cpu_total_time - (idle_time - (prev ? prev->idle_time : 0)));
  61
  62         if (prev) {
  63                 prev->idle_time = idle_time;
  64                 prev->kernel_time = kernel_time;
  65                 prev->user_time = user_time;
  66         }
  67
  68         if (cpu_total_time > 0 && cpu_busy_time > 0)
  69                 cpu_usage = (gint32)(cpu_busy_time * 100 / cpu_total_time);
  70
  71         return cpu_usage;
  72 }
  73 #endif /* G_HAVE_API_SUPPORT(HAVE_CLASSIC_WINAPI_SUPPORT) */
  74 #endif /* HOST_WIN32*/