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/* Copyright (C) 2005-2013 Shugo Maeda <shugo@ruby-lang.org> and Charlie Savage <cfis@savagexi.com>
Please see the LICENSE file for copyright and distribution information */
#include "ruby_prof.h"
static VALUE cMeasureCpuTime;
/* The _WIN32 check is needed for msys (and maybe cygwin?) */
#if defined(_WIN32)
static unsigned long long get_cpu_time()
{
LARGE_INTEGER time;
QueryPerformanceCounter(&time);
return time.QuadPart;
}
static unsigned long long get_cpu_frequency()
{
static unsigned long long cpu_frequency;
if(!cpu_frequency) {
LARGE_INTEGER cpu_frequency_struct;
QueryPerformanceFrequency(&cpu_frequency_struct);
cpu_frequency = cpu_frequency_struct.QuadPart;
}
return cpu_frequency;
}
static double measure_cpu_time()
{
return ((double)get_cpu_time()) / get_cpu_frequency();
}
#else
#include <sys/resource.h>
#include <stdint.h>
#include <time.h>
static unsigned long long get_cpu_time()
{
#if defined(__i386__) || defined(__x86_64__)
uint32_t a, d;
__asm__ volatile("rdtsc" : "=a" (a), "=d" (d));
return ((uint64_t)d << 32) + a;
#elif defined(__powerpc__) || defined(__ppc__)
unsigned long long x, y;
__asm__ __volatile__ ("\n\
1: mftbu %1\n\
mftb %L0\n\
mftbu %0\n\
cmpw %0,%1\n\
bne- 1b"
: "=r" (x), "=r" (y));
return x;
#endif
}
static unsigned long long get_cpu_frequency()
{
static unsigned long long cpu_frequency;
if(!cpu_frequency) {
unsigned long long x, y;
struct timespec ts;
ts.tv_sec = 0;
ts.tv_nsec = 500000000;
x = get_cpu_time();
nanosleep(&ts, NULL);
y = get_cpu_time();
cpu_frequency = (y - x) * 2;
}
return cpu_frequency;
}
static double measure_cpu_time()
{
struct rusage rusage;
getrusage(RUSAGE_SELF, &rusage);
double seconds = 0;
seconds += rusage.ru_utime.tv_sec;
seconds += rusage.ru_stime.tv_sec;
seconds += rusage.ru_utime.tv_usec / 1000000.0;
seconds += rusage.ru_stime.tv_usec / 1000000.0;
return seconds;
}
#endif
prof_measurer_t* prof_measurer_cpu_time()
{
prof_measurer_t* measure = ALLOC(prof_measurer_t);
measure->measure = measure_cpu_time;
return measure;
}
/* call-seq:
measure -> float
Returns the cpu time.*/
static VALUE
prof_measure_cpu_time(VALUE self)
{
return rb_float_new(measure_cpu_time());
}
/* call-seq:
cpu_frequency -> int
Returns the cpu's frequency. This value is needed when
RubyProf::measure_mode is set to CPU_TIME. */
static VALUE
prof_get_cpu_frequency(VALUE self)
{
return ULL2NUM(get_cpu_frequency());
}
void rp_init_measure_cpu_time()
{
rb_define_const(mProf, "CPU_TIME", INT2NUM(MEASURE_CPU_TIME));
rb_define_const(mProf, "CPU_TIME_ENABLED", Qtrue);
cMeasureCpuTime = rb_define_class_under(mMeasure, "CpuTime", rb_cObject);
rb_define_singleton_method(cMeasureCpuTime, "measure", prof_measure_cpu_time, 0);
rb_define_singleton_method(cMeasureCpuTime, "frequency", prof_get_cpu_frequency, 0);
}
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