runtime: simplify nr_cpus(), add a test for nr_jobs()

vlib/runtime/runtime.v

@@ -14,13 +14,6 @@ fn C.sysconf(name int) i64
 fn C.GetCurrentProcessorNumber() u32
 //}
 
-pub fn nr_cpus() int {
-	$if windows {
-		return nr_cpus_win()
-	}
-	return nr_cpus_nix()
-}
-
 pub fn nr_jobs() int {
 	mut cpus := nr_cpus()
 	// allow for overrides, for example using `VJOBS=32 ./v test .`
@@ -32,25 +25,21 @@ pub fn nr_jobs() int {
 }
 
 pub fn is_32bit() bool {
-	mut x := false
-	$if x32 { x = true }
-	return x
+	$if x32 { return true }
+	return false
 }
 
 pub fn is_64bit() bool {
-	mut x := false
-	$if x64 { x = true }
-	return x
+	$if x64 { return true }
+	return false
 }
 
 pub fn is_little_endian() bool {
-	mut x := false
-	$if little_endian { x = true }
-	return x
+	$if little_endian { return true }
+	return false
 }
 
 pub fn is_big_endian() bool {
-	mut x := false
-	$if big_endian { x = true }
-	return x
+	$if big_endian { return true }
+	return false
 }

vlib/runtime/runtime_nix.c.v

@@ -1,6 +1,6 @@
 module runtime
 
-fn nr_cpus_nix() int {
+pub fn nr_cpus() int {
 	$if linux {
 		return int(C.sysconf(C._SC_NPROCESSORS_ONLN))
 	}
@@ -12,8 +12,3 @@ fn nr_cpus_nix() int {
 	}
 	return 1
 }
-
-fn nr_cpus_win() int {
-	eprintln('nr_cpus_win should be callable only for windows')
-	return 1
-}

vlib/runtime/runtime_test.v

@@ -5,6 +5,11 @@ fn test_nr_cpus() {
 	assert nr_cpus > 0
 }
 
+fn test_nr_jobs() {
+	nr_jobs := runtime.nr_jobs()
+	assert nr_jobs > 0
+}
+
 fn test_is_32bit(){
 	x := runtime.is_32bit().str()
 	assert x == 'true' || x == 'false'

vlib/runtime/runtime_windows.c.v

@@ -2,15 +2,10 @@ module runtime
 
 import os
 
-fn nr_cpus_win() int {
+pub fn nr_cpus() int {
 	mut nr := int(C.GetCurrentProcessorNumber())
 	if nr == 0 {
 		nr = os.getenv('NUMBER_OF_PROCESSORS').int()
 	}
 	return nr
 }
-
-fn nr_cpus_nix() int {
-	eprintln('nr_cpus_nix should be callable only for nix platforms')
-	return 1
-}