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use std::env;
#[allow(deprecated)]
pub fn get_concurrency() -> usize {
return match env::var("RUST_TEST_THREADS") {
Ok(s) => {
let opt_n: Option<usize> = s.parse().ok();
match opt_n {
Some(n) if n > 0 => n,
_ => panic!("RUST_TEST_THREADS is `{}`, should be a positive integer.", s),
}
}
Err(..) => num_cpus(),
};
#[cfg(windows)]
#[allow(nonstandard_style)]
fn num_cpus() -> usize {
#[repr(C)]
struct SYSTEM_INFO {
wProcessorArchitecture: u16,
wReserved: u16,
dwPageSize: u32,
lpMinimumApplicationAddress: *mut u8,
lpMaximumApplicationAddress: *mut u8,
dwActiveProcessorMask: *mut u8,
dwNumberOfProcessors: u32,
dwProcessorType: u32,
dwAllocationGranularity: u32,
wProcessorLevel: u16,
wProcessorRevision: u16,
}
extern "system" {
fn GetSystemInfo(info: *mut SYSTEM_INFO) -> i32;
}
unsafe {
let mut sysinfo = std::mem::zeroed();
GetSystemInfo(&mut sysinfo);
sysinfo.dwNumberOfProcessors as usize
}
}
#[cfg(target_os = "vxworks")]
fn num_cpus() -> usize {
1
}
#[cfg(target_os = "redox")]
fn num_cpus() -> usize {
1
}
#[cfg(target_os = "hermit")]
fn num_cpus() -> usize {
1
}
#[cfg(any(
all(target_arch = "wasm32", not(target_os = "emscripten")),
all(target_vendor = "fortanix", target_env = "sgx")
))]
fn num_cpus() -> usize {
1
}
#[cfg(any(
target_os = "android",
target_os = "cloudabi",
target_os = "emscripten",
target_os = "fuchsia",
target_os = "ios",
target_os = "linux",
target_os = "macos",
target_os = "solaris",
target_os = "illumos",
))]
fn num_cpus() -> usize {
unsafe { libc::sysconf(libc::_SC_NPROCESSORS_ONLN) as usize }
}
#[cfg(any(target_os = "freebsd", target_os = "dragonfly", target_os = "netbsd"))]
fn num_cpus() -> usize {
use std::ptr;
let mut cpus: libc::c_uint = 0;
let mut cpus_size = std::mem::size_of_val(&cpus);
unsafe {
cpus = libc::sysconf(libc::_SC_NPROCESSORS_ONLN) as libc::c_uint;
}
if cpus < 1 {
let mut mib = [libc::CTL_HW, libc::HW_NCPU, 0, 0];
unsafe {
libc::sysctl(
mib.as_mut_ptr(),
2,
&mut cpus as *mut _ as *mut _,
&mut cpus_size as *mut _ as *mut _,
ptr::null_mut(),
0,
);
}
if cpus < 1 {
cpus = 1;
}
}
cpus as usize
}
#[cfg(target_os = "openbsd")]
fn num_cpus() -> usize {
use std::ptr;
let mut cpus: libc::c_uint = 0;
let mut cpus_size = std::mem::size_of_val(&cpus);
let mut mib = [libc::CTL_HW, libc::HW_NCPU, 0, 0];
unsafe {
libc::sysctl(
mib.as_mut_ptr(),
2,
&mut cpus as *mut _ as *mut _,
&mut cpus_size as *mut _ as *mut _,
ptr::null_mut(),
0,
);
}
if cpus < 1 {
cpus = 1;
}
cpus as usize
}
#[cfg(target_os = "haiku")]
fn num_cpus() -> usize {
1
}
#[cfg(target_os = "l4re")]
fn num_cpus() -> usize {
1
}
}