wmcpuload/src/cpu_darwin.c

   1 /*
   2  * cpu_darwin - module to get cpu usage, for Darwin
   3  *
   4  * Copyright (C) 2002 Landon Fuller <landonblue@mac.com>
   5  *
   6  * Licensed under the GPL
   7  */
   8
   9 #ifdef HAVE_CONFIG_H
  10 #include "config.h"
  11 #endif
  12
  13 #include <stdio.h>
  14 #include <unistd.h>
  15 #include <stdlib.h>
  16 #include <string.h>
  17 #include "cpu.h"
  18
  19 #include <mach/host_info.h>
  20 #include <mach/mach_types.h>
  21 #include <mach/message.h>
  22
  23 static host_cpu_load_info_data_t prevcount, curcount;
  24 static mach_port_t host_priv_port;
  25
  26 static
  27 getload(host_cpu_load_info_t cpucounters)
  28 {
  29     mach_msg_type_number_t count;
  30     kern_return_t kr;
  31     count = HOST_CPU_LOAD_INFO_COUNT;
  32     kr = host_statistics (host_priv_port, HOST_CPU_LOAD_INFO, (host_info_t) cpucounters, &count);
  33     return (kr);
  34 }
  35
  36 void
  37 cpu_init(void)
  38 {
  39     host_priv_port = mach_host_self();
  40     getload(&prevcount);
  41     return;
  42 }
  43
  44 /* Returns the current CPU usage in percent */
  45 int
  46 cpu_get_usage(cpu_options *opts)
  47 {
  48     double userticks, systicks, idleticks, totalticks, usedticks;
  49     getload(&curcount);
  50
  51     userticks = curcount.cpu_ticks[CPU_STATE_USER] - prevcount.cpu_ticks[CPU_STATE_USER];
  52     systicks = curcount.cpu_ticks[CPU_STATE_SYSTEM] - prevcount.cpu_ticks[CPU_STATE_SYSTEM];
  53     idleticks = curcount.cpu_ticks[CPU_STATE_IDLE] - prevcount.cpu_ticks[CPU_STATE_IDLE];
  54     prevcount = curcount;
  55     usedticks = userticks + systicks;
  56     totalticks = usedticks + idleticks;
  57     return ((100 * (double) usedticks) / totalticks);
  58 }