Module: AbsoluteTime

Defined in:
ext/absolute_time.c,
ext/absolute_time.c

Overview

Ruby interface to monotonically-increasing system timer.

Class Method Summary collapse

Class Method Details

.monotonic? ⇒ Boolean

Returns true if this module is able to use a guaranteed monotonically-increasing clock, false otherwise.

Returns:

  • (Boolean) 


88
89
90
91
92
93
94
95
96
 
# File 'ext/absolute_time.c', line 88

static VALUE
module_is_monotonic(VALUE self_)
{
#if defined(HAVE_CLOCK_GETTIME) && defined(CLOCK_MONOTONIC) || defined(HAVE_MACH_MACH_TIME_H)
    return Qtrue;
#else
    return Qfalse;
#endif
}

.now ⇒ Float

Returns the current value of the system timer as a floating-point number of seconds. Although the units of the return value are seconds, they cannot be safely interpreted as a wall clock time. The return value is only useful when compared to the return value of a previous or subsequent call to AbsoluteTime.now().

If a monotonically increasing system clock is not available, this function falls back to using the wall clock time. You can check to see whether a monotonic clock is available using AbsoluteTime.monotonic?()

Returns:

  • (Float) 


56
57
58
59
60
 
# File 'ext/absolute_time.c', line 56

static VALUE
module_now(VALUE self_)
{
    return rb_float_new(get_absolute_time());
}

.realtime { ... } ⇒ Float

Like Benchmark.realtime(), returns the elapsed time to execute the specified block, as a floating-point number of seconds.

Yields:

  • []

Returns:

  • (Float) 


69
70
71
72
73
74
75
76
77
78
79
 
# File 'ext/absolute_time.c', line 69

static VALUE
module_realtime(VALUE self_)
{
    double start_time, end_time;
    
    start_time = get_absolute_time();
    rb_yield(Qnil);
    end_time = get_absolute_time();
    
    return rb_float_new(end_time - start_time);
}