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#
#
# Nimrod's Runtime Library
# (c) Copyright 2014 Andreas Rumpf
#
# See the file "copying.txt", included in this
# distribution, for details about the copyright.
#
## This module implements procs to determine the number of CPUs / cores.
include "system/inclrtl"
import strutils, os
when not defined(windows):
import posix
when defined(linux):
import linux
when defined(macosx) or defined(bsd):
const
CTL_HW = 6
HW_AVAILCPU = 25
HW_NCPU = 3
proc sysctl(x: ptr array[0..3, cint], y: cint, z: pointer,
a: var csize, b: pointer, c: int): cint {.
importc: "sysctl", header: "<sys/sysctl.h>".}
proc countProcessors*(): int {.rtl, extern: "ncpi$1".} =
## returns the numer of the processors/cores the machine has.
## Returns 0 if it cannot be detected.
when defined(windows):
var x = getEnv("NUMBER_OF_PROCESSORS")
if x.len > 0: result = parseInt(x.string)
elif defined(macosx) or defined(bsd):
var
mib: array[0..3, cint]
numCPU: int
len: csize
mib[0] = CTL_HW
mib[1] = HW_AVAILCPU
len = sizeof(numCPU)
discard sysctl(addr(mib), 2, addr(numCPU), len, nil, 0)
if numCPU < 1:
mib[1] = HW_NCPU
discard sysctl(addr(mib), 2, addr(numCPU), len, nil, 0)
result = numCPU
elif defined(hpux):
result = mpctl(MPC_GETNUMSPUS, nil, nil)
elif defined(irix):
var SC_NPROC_ONLN {.importc: "_SC_NPROC_ONLN", header: "<unistd.h>".}: cint
result = sysconf(SC_NPROC_ONLN)
else:
result = sysconf(SC_NPROCESSORS_ONLN)
if result <= 0: result = 1
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