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std::thread::available_parallelism merging linux/android/freebsd version #120589

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std::thread::available_parallelism merging linux/android/freebsd version #120589

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33 changes: 11 additions & 22 deletions library/std/src/sys/pal/unix/thread.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -353,6 +353,7 @@ pub fn available_parallelism() -> io::Result<NonZero<usize>> {
target_os = "hurd",
target_os = "linux",
target_os = "aix",
target_os = "freebsd",
target_vendor = "apple",
))] {
#[allow(unused_assignments)]
Expand All @@ -362,9 +363,17 @@ pub fn available_parallelism() -> io::Result<NonZero<usize>> {
#[cfg(any(target_os = "android", target_os = "linux"))]
{
quota = cgroups::quota().max(1);
let mut set: libc::cpu_set_t = unsafe { mem::zeroed() };
}

#[cfg(any(target_os = "android", target_os = "linux", target_os = "freebsd"))]
{
#[cfg(not(target_os = "freebsd"))]
type cpuset = libc::cpu_set_t;
#[cfg(target_os = "freebsd")]
type cpuset = libc::cpuset_t;
let mut set: cpuset = unsafe { mem::zeroed() };
unsafe {
if libc::sched_getaffinity(0, mem::size_of::<libc::cpu_set_t>(), &mut set) == 0 {
if libc::sched_getaffinity(0, mem::size_of::<cpuset>(), &mut set) == 0 {
let count = libc::CPU_COUNT(&set) as usize;
let count = count.min(quota);

Expand All @@ -389,32 +398,12 @@ pub fn available_parallelism() -> io::Result<NonZero<usize>> {
}
}
} else if #[cfg(any(
target_os = "freebsd",
target_os = "dragonfly",
target_os = "openbsd",
target_os = "netbsd",
))] {
use crate::ptr;

#[cfg(target_os = "freebsd")]
{
let mut set: libc::cpuset_t = unsafe { mem::zeroed() };
unsafe {
if libc::cpuset_getaffinity(
libc::CPU_LEVEL_WHICH,
libc::CPU_WHICH_PID,
-1,
mem::size_of::<libc::cpuset_t>(),
&mut set,
) == 0 {
let count = libc::CPU_COUNT(&set) as usize;
if count > 0 {
return Ok(NonZero::new_unchecked(count));
}
}
}
}

#[cfg(target_os = "netbsd")]
{
unsafe {
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