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#
#
# Nim's Runtime Library
# (c) Copyright 2015 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(freebsd) or defined(macosx):
{.emit:"#include <sys/types.h>".}
when defined(openbsd) or defined(netbsd):
{.emit:"#include <sys/param.h>".}
when defined(macosx) or defined(bsd):
# we HAVE to emit param.h before sysctl.h so we cannot use .header here
# either. The amount of archaic bullshit in Poonix based OSes is just insane.
{.emit:"#include <sys/sysctl.h>".}
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", nodecl.}
when defined(genode):
include genode/env
proc affinitySpaceTotal(env: GenodeEnvPtr): cuint {.
importcpp: "@->cpu().affinity_space().total()".}
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):
type
SYSTEM_INFO {.final, pure.} = object
u1: int32
dwPageSize: int32
lpMinimumApplicationAddress: pointer
lpMaximumApplicationAddress: pointer
dwActiveProcessorMask: ptr int32
dwNumberOfProcessors: int32
dwProcessorType: int32
dwAllocationGranularity: int32
wProcessorLevel: int16
wProcessorRevision: int16
proc GetSystemInfo(lpSystemInfo: var SYSTEM_INFO) {.stdcall, dynlib: "kernel32", importc: "GetSystemInfo".}
var
si: SYSTEM_INFO
GetSystemInfo(si)
result = si.dwNumberOfProcessors
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)
elif defined(genode):
result = runtimeEnv.affinitySpaceTotal().int
else:
result = sysconf(SC_NPROCESSORS_ONLN)
if result <= 0: result = 0
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