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|
use crate::Result;
use core::mem::size_of;
use std::fs::File;
use std::io::Read;
type MaskWordType = u32;
const MAX_CPUS: usize = 1024;
const MASK_WORD_BITS: usize = 8 * size_of::<MaskWordType>();
const MASK_WORD_COUNT: usize = (MAX_CPUS + MASK_WORD_BITS - 1) / MASK_WORD_BITS;
pub struct CpuSet {
// The maximum number of supported CPUs.
mask: [MaskWordType; MASK_WORD_COUNT],
}
impl CpuSet {
pub fn new() -> Self {
CpuSet {
mask: [0; MASK_WORD_COUNT],
}
}
pub fn get_count(&self) -> usize {
let mut result = 0 as usize;
for idx in 0..MASK_WORD_COUNT {
result += self.mask[idx].count_ones() as usize;
}
return result;
}
pub fn set_bit(&mut self, idx: usize) {
println!("Setting2 {}", idx);
if idx < MAX_CPUS {
self.mask[idx / MASK_WORD_BITS] |= 1 << (idx % MASK_WORD_BITS);
}
}
pub fn parse_sys_file(&mut self, file: &mut File) -> Result<()> {
let mut content = String::new();
file.read_to_string(&mut content)?;
// Expected format: comma-separated list of items, where each
// item can be a decimal integer, or two decimal integers separated
// by a dash.
// E.g.:
// 0
// 0,1,2,3
// 0-3
// 1,10-23
for items in content.split(',') {
let items = items.trim();
if items.is_empty() {
continue;
}
// TODO: ranges
println!("Setting {}", items);
let cores: std::result::Result<Vec<_>, _> =
items.split("-").map(|x| x.parse::<usize>()).collect();
let cores = cores?;
match cores.as_slice() {
[x] => self.set_bit(*x),
[x, y] => {
for core in *x..=*y {
self.set_bit(core)
}
}
_ => {
return Err(format!("Unparsable cores: {:?}", cores).into());
}
}
}
Ok(())
}
pub fn intersect_with(&mut self, other: &Self) {
for idx in 0..MASK_WORD_COUNT {
self.mask[idx] &= other.mask[idx];
}
}
}
#[cfg(test)]
mod tests {
use super::*;
// In tests we can have access to std
extern crate std;
use std::io::Write;
fn new_file(content: &str) -> File {
let mut file = tempfile::Builder::new()
.prefix("cpu_sets")
.tempfile()
.unwrap();
write!(file, "{}", content).unwrap();
std::fs::File::open(file).unwrap()
}
#[test]
fn test_empty_count() {
let set = CpuSet::new();
assert_eq!(set.get_count(), 0);
}
#[test]
fn test_one_cpu() {
let mut file = new_file("10");
let mut set = CpuSet::new();
let res = set.parse_sys_file(&mut file);
assert!(res.is_ok());
assert_eq!(set.get_count(), 1);
}
#[test]
fn test_one_cpu_newline() {
let mut file = new_file("10\n");
let mut set = CpuSet::new();
let res = set.parse_sys_file(&mut file);
assert!(res.is_ok());
assert_eq!(set.get_count(), 1);
}
#[test]
fn test_two_cpus() {
let mut file = new_file("1,10\n");
let mut set = CpuSet::new();
let res = set.parse_sys_file(&mut file);
assert!(res.is_ok());
assert_eq!(set.get_count(), 2);
// TODO: Actually check the cpus?!
}
#[test]
fn test_two_cpus_with_range() {
let mut file = new_file("1-2\n");
let mut set = CpuSet::new();
let res = set.parse_sys_file(&mut file);
assert!(res.is_ok());
assert_eq!(set.get_count(), 2);
// TODO: Actually check the cpus?!
}
#[test]
fn test_ten_cpus_with_range() {
let mut file = new_file("9-18\n");
let mut set = CpuSet::new();
let res = set.parse_sys_file(&mut file);
assert!(res.is_ok());
assert_eq!(set.get_count(), 10);
// TODO: Actually check the cpus?!
}
#[test]
fn test_multiple_items() {
let mut file = new_file("0, 2-4, 128\n");
let mut set = CpuSet::new();
let res = set.parse_sys_file(&mut file);
assert!(res.is_ok());
assert_eq!(set.get_count(), 5);
// TODO: Actually check the cpus?!
}
#[test]
fn test_intersects_with() {
let mut file1 = new_file("9-19\n");
let mut set1 = CpuSet::new();
let res = set1.parse_sys_file(&mut file1);
assert!(res.is_ok());
assert_eq!(set1.get_count(), 11);
// TODO: Actually check the cpus?!
let mut file2 = new_file("16-24\n");
let mut set2 = CpuSet::new();
let res = set2.parse_sys_file(&mut file2);
assert!(res.is_ok());
assert_eq!(set2.get_count(), 9);
set1.intersect_with(&set2);
assert_eq!(set1.get_count(), 4);
assert_eq!(set2.get_count(), 9);
}
#[test]
fn test_bad_input() {
let mut file = new_file("abc\n");
let mut set = CpuSet::new();
let res = set.parse_sys_file(&mut file);
assert!(res.is_err());
assert_eq!(set.get_count(), 0);
// TODO: Actually check the cpus?!
}
#[test]
fn test_bad_input_range() {
let mut file = new_file("1-abc\n");
let mut set = CpuSet::new();
let res = set.parse_sys_file(&mut file);
assert!(res.is_err());
assert_eq!(set.get_count(), 0);
// TODO: Actually check the cpus?!
}
}
/*
TEST(CpuSetTest, IntersectWith) {
ScopedTestFile file1("9-19");
ASSERT_TRUE(file1.IsOk());
CpuSet set1;
ASSERT_TRUE(set1.ParseSysFile(file1.GetFd()));
ASSERT_EQ(11, set1.GetCount());
ScopedTestFile file2("16-24");
ASSERT_TRUE(file2.IsOk());
CpuSet set2;
ASSERT_TRUE(set2.ParseSysFile(file2.GetFd()));
ASSERT_EQ(9, set2.GetCount());
set1.IntersectWith(set2);
ASSERT_EQ(4, set1.GetCount());
ASSERT_EQ(9, set2.GetCount());
}
TEST(CpuSetTest, SelfIntersection) {
ScopedTestFile file1("9-19");
ASSERT_TRUE(file1.IsOk());
CpuSet set1;
ASSERT_TRUE(set1.ParseSysFile(file1.GetFd()));
ASSERT_EQ(11, set1.GetCount());
set1.IntersectWith(set1);
ASSERT_EQ(11, set1.GetCount());
}
TEST(CpuSetTest, EmptyIntersection) {
ScopedTestFile file1("0-19");
ASSERT_TRUE(file1.IsOk());
CpuSet set1;
ASSERT_TRUE(set1.ParseSysFile(file1.GetFd()));
ASSERT_EQ(20, set1.GetCount());
ScopedTestFile file2("20-39");
ASSERT_TRUE(file2.IsOk());
CpuSet set2;
ASSERT_TRUE(set2.ParseSysFile(file2.GetFd()));
ASSERT_EQ(20, set2.GetCount());
set1.IntersectWith(set2);
ASSERT_EQ(0, set1.GetCount());
ASSERT_EQ(20, set2.GetCount());
}
*/
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