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#![no_std] #![deny(warnings)] #[derive(Debug, Clone, Copy)] pub struct CpuInfo { pub l1_cache_size: usize, pub l2_cache_size: usize, pub l3_cache_size: usize, pub num_cpus: usize, } impl CpuInfo { #[cfg(target_os = "linux")] pub fn try_new() -> Result<CpuInfo, ()> { use libc::sysconf; unsafe { let l1_cache_size = sysconf(libc::_SC_LEVEL1_DCACHE_SIZE); if l1_cache_size <= 0 { return Err(()); } let l2_cache_size = sysconf(libc::_SC_LEVEL2_CACHE_SIZE); if l2_cache_size <= 0 { return Err(()); } let l3_cache_size = sysconf(libc::_SC_LEVEL3_CACHE_SIZE); if l3_cache_size <= 0 { return Err(()); } let num_cpus = sysconf(libc::_SC_NPROCESSORS_CONF); if num_cpus <= 0 { return Err(()); } Ok(CpuInfo { l1_cache_size: l1_cache_size as usize, l2_cache_size: l2_cache_size as usize, l3_cache_size: l3_cache_size as usize, num_cpus: num_cpus as usize, }) } } #[cfg(target_os = "macos")] pub fn try_new() -> Result<CpuInfo, ()> { use core::{mem, ptr}; use libc::{c_int, c_void, sysconf, sysctl}; unsafe { let mut l1_cache_size: c_int = 0; let mut l2_cache_size: c_int = 0; let mut l3_cache_size: c_int = 0; let mut size = mem::size_of::<c_int>(); const NAMELEN: libc::c_uint = 2; let mut name = [libc::CTL_HW, libc::HW_L1DCACHESIZE]; if sysctl( name.as_mut_ptr(), NAMELEN, &mut l1_cache_size as *mut c_int as *mut c_void, &mut size, ptr::null_mut(), 0, ) != 0 { return Err(()); } name[1] = libc::HW_L2CACHESIZE; if sysctl( name.as_mut_ptr(), NAMELEN, &mut l2_cache_size as *mut c_int as *mut c_void, &mut size, ptr::null_mut(), 0, ) != 0 { return Err(()); } name[1] = libc::HW_L3CACHESIZE; if sysctl( name.as_mut_ptr(), NAMELEN, &mut l3_cache_size as *mut c_int as *mut c_void, &mut size, ptr::null_mut(), 0, ) != 0 { return Err(()); } if l1_cache_size <= 0 || l2_cache_size <= 0 || l3_cache_size <= 0 { return Err(()); } let num_cpus = sysconf(libc::_SC_NPROCESSORS_CONF); if num_cpus <= 0 { return Err(()); } Ok(CpuInfo { l1_cache_size: l1_cache_size as usize, l2_cache_size: l2_cache_size as usize, l3_cache_size: l3_cache_size as usize, num_cpus: num_cpus as usize, }) } } #[cfg(target_os = "windows")] pub fn try_new() -> Result<CpuInfo, ()> { use core::{mem, ptr}; use libc::{c_void, free, malloc}; use winapi::shared::minwindef::{FALSE, TRUE}; use winapi::shared::winerror::ERROR_INSUFFICIENT_BUFFER; use winapi::um::errhandlingapi::GetLastError; use winapi::um::sysinfoapi::GetLogicalProcessorInformation; use winapi::um::winnt::{ CacheData, RelationCache, RelationProcessorCore, SYSTEM_LOGICAL_PROCESSOR_INFORMATION, }; unsafe { let mut buffer = ptr::null_mut(); let mut len = 0; if TRUE == GetLogicalProcessorInformation(buffer, &mut len) { return Err(()); } if GetLastError() == ERROR_INSUFFICIENT_BUFFER { buffer = malloc(len as usize) as *mut SYSTEM_LOGICAL_PROCESSOR_INFORMATION; if buffer.is_null() { return Err(()); } } else { return Err(()); } if FALSE == GetLogicalProcessorInformation(buffer, &mut len) { free(buffer as *mut c_void); return Err(()); } let mut ptr = buffer; let mut l1_cache_size = 0; let mut l2_cache_size = 0; let mut l3_cache_size = 0; let mut num_cpus = 0; for _ in 0..len as usize / mem::size_of::<SYSTEM_LOGICAL_PROCESSOR_INFORMATION>() { let info = *ptr; if info.Relationship == RelationCache { let cache = info.u.Cache(); match cache.Level { 1 => { if cache.Type == CacheData { l1_cache_size = cache.Size } } 2 => l2_cache_size = cache.Size, 3 => l3_cache_size = cache.Size, _ => { free(buffer as *mut c_void); return Err(()); } } } else if info.Relationship == RelationProcessorCore { num_cpus += 1; } ptr = ptr.add(1); } free(buffer as *mut c_void); if l1_cache_size == 0 || l2_cache_size == 0 || l3_cache_size == 0 || num_cpus == 0 { return Err(()); } Ok(CpuInfo { l1_cache_size: l1_cache_size as usize, l2_cache_size: l2_cache_size as usize, l3_cache_size: l3_cache_size as usize, num_cpus, }) } } } #[cfg(test)] mod tests { use super::*; #[test] fn test_create_cpu_info() { let _info = CpuInfo::try_new().unwrap(); } }