use crate::cmp;
use crate::ffi::CStr;
use crate::io;
use crate::mem;
use crate::num::NonZeroUsize;
use crate::ptr;
use crate::sys::{os, stack_overflow};
use crate::time::Duration;
#[cfg(all(target_os = "linux", target_env = "gnu"))]
use crate::sys::weak::dlsym;
#[cfg(any(target_os = "solaris", target_os = "illumos", target_os = "nto"))]
use crate::sys::weak::weak;
#[cfg(not(any(target_os = "l4re", target_os = "vxworks", target_os = "espidf")))]
pub const DEFAULT_MIN_STACK_SIZE: usize = 2 * 1024 * 1024;
#[cfg(target_os = "l4re")]
pub const DEFAULT_MIN_STACK_SIZE: usize = 1024 * 1024;
#[cfg(target_os = "vxworks")]
pub const DEFAULT_MIN_STACK_SIZE: usize = 256 * 1024;
#[cfg(target_os = "espidf")]
pub const DEFAULT_MIN_STACK_SIZE: usize = 0; #[cfg(target_os = "fuchsia")]
mod zircon {
type zx_handle_t = u32;
type zx_status_t = i32;
pub const ZX_PROP_NAME: u32 = 3;
extern "C" {
pub fn zx_object_set_property(
handle: zx_handle_t,
property: u32,
value: *const libc::c_void,
value_size: libc::size_t,
) -> zx_status_t;
pub fn zx_thread_self() -> zx_handle_t;
}
}
pub struct Thread {
id: libc::pthread_t,
}
unsafe impl Send for Thread {}
unsafe impl Sync for Thread {}
impl Thread {
pub unsafe fn new(stack: usize, p: Box<dyn FnOnce()>) -> io::Result<Thread> {
let p = Box::into_raw(Box::new(p));
let mut native: libc::pthread_t = mem::zeroed();
let mut attr: libc::pthread_attr_t = mem::zeroed();
assert_eq!(libc::pthread_attr_init(&mut attr), 0);
#[cfg(target_os = "espidf")]
if stack > 0 {
assert_eq!(
libc::pthread_attr_setstacksize(&mut attr, cmp::max(stack, min_stack_size(&attr))),
0
);
}
#[cfg(not(target_os = "espidf"))]
{
let stack_size = cmp::max(stack, min_stack_size(&attr));
match libc::pthread_attr_setstacksize(&mut attr, stack_size) {
0 => {}
n => {
assert_eq!(n, libc::EINVAL);
let page_size = os::page_size();
let stack_size =
(stack_size + page_size - 1) & (-(page_size as isize - 1) as usize - 1);
assert_eq!(libc::pthread_attr_setstacksize(&mut attr, stack_size), 0);
}
};
}
let ret = libc::pthread_create(&mut native, &attr, thread_start, p as *mut _);
assert_eq!(libc::pthread_attr_destroy(&mut attr), 0);
return if ret != 0 {
drop(Box::from_raw(p));
Err(io::Error::from_raw_os_error(ret))
} else {
Ok(Thread { id: native })
};
extern "C" fn thread_start(main: *mut libc::c_void) -> *mut libc::c_void {
unsafe {
let _handler = stack_overflow::Handler::new();
Box::from_raw(main as *mut Box<dyn FnOnce()>)();
}
ptr::null_mut()
}
}
pub fn yield_now() {
let ret = unsafe { libc::sched_yield() };
debug_assert_eq!(ret, 0);
}
#[cfg(target_os = "android")]
pub fn set_name(name: &CStr) {
const PR_SET_NAME: libc::c_int = 15;
unsafe {
libc::prctl(
PR_SET_NAME,
name.as_ptr(),
0 as libc::c_ulong,
0 as libc::c_ulong,
0 as libc::c_ulong,
);
}
}
#[cfg(target_os = "linux")]
pub fn set_name(name: &CStr) {
const TASK_COMM_LEN: usize = 16;
unsafe {
let name = truncate_cstr::<{ TASK_COMM_LEN }>(name);
let res = libc::pthread_setname_np(libc::pthread_self(), name.as_ptr());
debug_assert_eq!(res, 0);
}
}
#[cfg(any(target_os = "freebsd", target_os = "dragonfly", target_os = "openbsd"))]
pub fn set_name(name: &CStr) {
unsafe {
libc::pthread_set_name_np(libc::pthread_self(), name.as_ptr());
}
}
#[cfg(any(target_os = "macos", target_os = "ios", target_os = "tvos", target_os = "watchos"))]
pub fn set_name(name: &CStr) {
unsafe {
let name = truncate_cstr::<{ libc::MAXTHREADNAMESIZE }>(name);
let res = libc::pthread_setname_np(name.as_ptr());
debug_assert_eq!(res, 0);
}
}
#[cfg(target_os = "netbsd")]
pub fn set_name(name: &CStr) {
unsafe {
let cname = CStr::from_bytes_with_nul_unchecked(b"%s\0".as_slice());
let res = libc::pthread_setname_np(
libc::pthread_self(),
cname.as_ptr(),
name.as_ptr() as *mut libc::c_void,
);
debug_assert_eq!(res, 0);
}
}
#[cfg(any(target_os = "solaris", target_os = "illumos", target_os = "nto"))]
pub fn set_name(name: &CStr) {
weak! {
fn pthread_setname_np(
libc::pthread_t, *const libc::c_char
) -> libc::c_int
}
if let Some(f) = pthread_setname_np.get() {
let res = unsafe { f(libc::pthread_self(), name.as_ptr()) };
debug_assert_eq!(res, 0);
}
}
#[cfg(target_os = "fuchsia")]
pub fn set_name(name: &CStr) {
use self::zircon::*;
unsafe {
zx_object_set_property(
zx_thread_self(),
ZX_PROP_NAME,
name.as_ptr() as *const libc::c_void,
name.to_bytes().len(),
);
}
}
#[cfg(target_os = "haiku")]
pub fn set_name(name: &CStr) {
unsafe {
let thread_self = libc::find_thread(ptr::null_mut());
libc::rename_thread(thread_self, name.as_ptr());
}
}
#[cfg(any(
target_env = "newlib",
target_os = "l4re",
target_os = "emscripten",
target_os = "redox",
target_os = "vxworks"
))]
pub fn set_name(_name: &CStr) {
}
#[cfg(not(target_os = "espidf"))]
pub fn sleep(dur: Duration) {
let mut secs = dur.as_secs();
let mut nsecs = dur.subsec_nanos() as _;
unsafe {
while secs > 0 || nsecs > 0 {
let mut ts = libc::timespec {
tv_sec: cmp::min(libc::time_t::MAX as u64, secs) as libc::time_t,
tv_nsec: nsecs,
};
secs -= ts.tv_sec as u64;
let ts_ptr = &mut ts as *mut _;
if libc::nanosleep(ts_ptr, ts_ptr) == -1 {
assert_eq!(os::errno(), libc::EINTR);
secs += ts.tv_sec as u64;
nsecs = ts.tv_nsec;
} else {
nsecs = 0;
}
}
}
}
#[cfg(target_os = "espidf")]
pub fn sleep(dur: Duration) {
let mut micros = dur.as_micros();
unsafe {
while micros > 0 {
let st = if micros > u32::MAX as u128 { u32::MAX } else { micros as u32 };
libc::usleep(st);
micros -= st as u128;
}
}
}
pub fn join(self) {
unsafe {
let ret = libc::pthread_join(self.id, ptr::null_mut());
mem::forget(self);
assert!(ret == 0, "failed to join thread: {}", io::Error::from_raw_os_error(ret));
}
}
pub fn id(&self) -> libc::pthread_t {
self.id
}
pub fn into_id(self) -> libc::pthread_t {
let id = self.id;
mem::forget(self);
id
}
}
impl Drop for Thread {
fn drop(&mut self) {
let ret = unsafe { libc::pthread_detach(self.id) };
debug_assert_eq!(ret, 0);
}
}
#[cfg(any(
target_os = "linux",
target_os = "macos",
target_os = "ios",
target_os = "tvos",
target_os = "watchos",
))]
fn truncate_cstr<const MAX_WITH_NUL: usize>(cstr: &CStr) -> [libc::c_char; MAX_WITH_NUL] {
let mut result = [0; MAX_WITH_NUL];
for (src, dst) in cstr.to_bytes().iter().zip(&mut result[..MAX_WITH_NUL - 1]) {
*dst = *src as libc::c_char;
}
result
}
pub fn available_parallelism() -> io::Result<NonZeroUsize> {
cfg_if::cfg_if! {
if #[cfg(any(
target_os = "android",
target_os = "emscripten",
target_os = "fuchsia",
target_os = "ios",
target_os = "tvos",
target_os = "linux",
target_os = "macos",
target_os = "solaris",
target_os = "illumos",
))] {
#[cfg(any(target_os = "android", target_os = "linux"))]
{
let quota = cgroups::quota().max(1);
let mut set: libc::cpu_set_t = unsafe { mem::zeroed() };
unsafe {
if libc::sched_getaffinity(0, mem::size_of::<libc::cpu_set_t>(), &mut set) == 0 {
let count = libc::CPU_COUNT(&set) as usize;
let count = count.min(quota);
return Ok(NonZeroUsize::new_unchecked(count));
}
}
}
match unsafe { libc::sysconf(libc::_SC_NPROCESSORS_ONLN) } {
-1 => Err(io::Error::last_os_error()),
0 => Err(io::const_io_error!(io::ErrorKind::NotFound, "The number of hardware threads is not known for the target platform")),
cpus => Ok(unsafe { NonZeroUsize::new_unchecked(cpus as usize) }),
}
} else if #[cfg(any(target_os = "freebsd", target_os = "dragonfly", 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(NonZeroUsize::new_unchecked(count));
}
}
}
}
#[cfg(target_os = "netbsd")]
{
unsafe {
let set = libc::_cpuset_create();
if !set.is_null() {
let mut count: usize = 0;
if libc::pthread_getaffinity_np(libc::pthread_self(), libc::_cpuset_size(set), set) == 0 {
for i in 0..u64::MAX {
match libc::_cpuset_isset(i, set) {
-1 => break,
0 => continue,
_ => count = count + 1,
}
}
}
libc::_cpuset_destroy(set);
if let Some(count) = NonZeroUsize::new(count) {
return Ok(count);
}
}
}
}
let mut cpus: libc::c_uint = 0;
let mut cpus_size = crate::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];
let res = 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 res == -1 {
return Err(io::Error::last_os_error());
} else if cpus == 0 {
return Err(io::const_io_error!(io::ErrorKind::NotFound, "The number of hardware threads is not known for the target platform"));
}
}
Ok(unsafe { NonZeroUsize::new_unchecked(cpus as usize) })
} else if #[cfg(target_os = "openbsd")] {
use crate::ptr;
let mut cpus: libc::c_uint = 0;
let mut cpus_size = crate::mem::size_of_val(&cpus);
let mut mib = [libc::CTL_HW, libc::HW_NCPU, 0, 0];
let res = 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 res == -1 {
return Err(io::Error::last_os_error());
} else if cpus == 0 {
return Err(io::const_io_error!(io::ErrorKind::NotFound, "The number of hardware threads is not known for the target platform"));
}
Ok(unsafe { NonZeroUsize::new_unchecked(cpus as usize) })
} else if #[cfg(target_os = "nto")] {
unsafe {
use libc::_syspage_ptr;
if _syspage_ptr.is_null() {
Err(io::const_io_error!(io::ErrorKind::NotFound, "No syspage available"))
} else {
let cpus = (*_syspage_ptr).num_cpu;
NonZeroUsize::new(cpus as usize)
.ok_or(io::const_io_error!(io::ErrorKind::NotFound, "The number of hardware threads is not known for the target platform"))
}
}
} else if #[cfg(target_os = "haiku")] {
unsafe {
let mut sinfo: libc::system_info = crate::mem::zeroed();
let res = libc::get_system_info(&mut sinfo);
if res != libc::B_OK {
return Err(io::const_io_error!(io::ErrorKind::NotFound, "The number of hardware threads is not known for the target platform"));
}
Ok(NonZeroUsize::new_unchecked(sinfo.cpu_count as usize))
}
} else {
Err(io::const_io_error!(io::ErrorKind::Unsupported, "Getting the number of hardware threads is not supported on the target platform"))
}
}
}
#[cfg(any(target_os = "android", target_os = "linux"))]
mod cgroups {
use crate::borrow::Cow;
use crate::ffi::OsString;
use crate::fs::{try_exists, File};
use crate::io::Read;
use crate::io::{BufRead, BufReader};
use crate::os::unix::ffi::OsStringExt;
use crate::path::Path;
use crate::path::PathBuf;
use crate::str::from_utf8;
#[derive(PartialEq)]
enum Cgroup {
V1,
V2,
}
pub(super) fn quota() -> usize {
let mut quota = usize::MAX;
if cfg!(miri) {
return quota;
}
let _: Option<()> = try {
let mut buf = Vec::with_capacity(128);
File::open("/proc/self/cgroup").ok()?.read_to_end(&mut buf).ok()?;
let (cgroup_path, version) =
buf.split(|&c| c == b'\n').fold(None, |previous, line| {
let mut fields = line.splitn(3, |&c| c == b':');
let version = match fields.nth(1) {
Some(b"") => Cgroup::V2,
Some(controllers)
if from_utf8(controllers)
.is_ok_and(|c| c.split(',').any(|c| c == "cpu")) =>
{
Cgroup::V1
}
_ => return previous,
};
if previous.is_some() && version == Cgroup::V2 {
return previous;
}
let path = fields.last()?;
Some((path[1..].to_owned(), version))
})?;
let cgroup_path = PathBuf::from(OsString::from_vec(cgroup_path));
quota = match version {
Cgroup::V1 => quota_v1(cgroup_path),
Cgroup::V2 => quota_v2(cgroup_path),
};
};
quota
}
fn quota_v2(group_path: PathBuf) -> usize {
let mut quota = usize::MAX;
let mut path = PathBuf::with_capacity(128);
let mut read_buf = String::with_capacity(20);
let cgroup_mount = "/sys/fs/cgroup";
path.push(cgroup_mount);
path.push(&group_path);
path.push("cgroup.controllers");
if matches!(try_exists(&path), Err(_) | Ok(false)) {
return usize::MAX;
};
path.pop();
let _: Option<()> = try {
while path.starts_with(cgroup_mount) {
path.push("cpu.max");
read_buf.clear();
if File::open(&path).and_then(|mut f| f.read_to_string(&mut read_buf)).is_ok() {
let raw_quota = read_buf.lines().next()?;
let mut raw_quota = raw_quota.split(' ');
let limit = raw_quota.next()?;
let period = raw_quota.next()?;
match (limit.parse::<usize>(), period.parse::<usize>()) {
(Ok(limit), Ok(period)) if period > 0 => {
quota = quota.min(limit / period);
}
_ => {}
}
}
path.pop(); path.pop(); }
};
quota
}
fn quota_v1(group_path: PathBuf) -> usize {
let mut quota = usize::MAX;
let mut path = PathBuf::with_capacity(128);
let mut read_buf = String::with_capacity(20);
let mounts: &[fn(&Path) -> Option<(_, &Path)>] = &[
|p| Some((Cow::Borrowed("/sys/fs/cgroup/cpu"), p)),
|p| Some((Cow::Borrowed("/sys/fs/cgroup/cpu,cpuacct"), p)),
find_mountpoint,
];
for mount in mounts {
let Some((mount, group_path)) = mount(&group_path) else { continue };
path.clear();
path.push(mount.as_ref());
path.push(&group_path);
if matches!(try_exists(&path), Err(_) | Ok(false)) {
continue;
}
while path.starts_with(mount.as_ref()) {
let mut parse_file = |name| {
path.push(name);
read_buf.clear();
let f = File::open(&path);
path.pop(); f.ok()?.read_to_string(&mut read_buf).ok()?;
let parsed = read_buf.trim().parse::<usize>().ok()?;
Some(parsed)
};
let limit = parse_file("cpu.cfs_quota_us");
let period = parse_file("cpu.cfs_period_us");
match (limit, period) {
(Some(limit), Some(period)) if period > 0 => quota = quota.min(limit / period),
_ => {}
}
path.pop();
}
break;
}
quota
}
fn find_mountpoint(group_path: &Path) -> Option<(Cow<'static, str>, &Path)> {
let mut reader = BufReader::new(File::open("/proc/self/mountinfo").ok()?);
let mut line = String::with_capacity(256);
loop {
line.clear();
if reader.read_line(&mut line).ok()? == 0 {
break;
}
let line = line.trim();
let mut items = line.split(' ');
let sub_path = items.nth(3)?;
let mount_point = items.next()?;
let mount_opts = items.next_back()?;
let filesystem_type = items.nth_back(1)?;
if filesystem_type != "cgroup" || !mount_opts.split(',').any(|opt| opt == "cpu") {
continue;
}
let sub_path = Path::new(sub_path).strip_prefix("/").ok()?;
if !group_path.starts_with(sub_path) {
continue;
}
let trimmed_group_path = group_path.strip_prefix(sub_path).ok()?;
return Some((Cow::Owned(mount_point.to_owned()), trimmed_group_path));
}
None
}
}
#[cfg(all(
not(target_os = "linux"),
not(target_os = "freebsd"),
not(target_os = "macos"),
not(target_os = "netbsd"),
not(target_os = "openbsd"),
not(target_os = "solaris")
))]
#[cfg_attr(test, allow(dead_code))]
pub mod guard {
use crate::ops::Range;
pub type Guard = Range<usize>;
pub unsafe fn current() -> Option<Guard> {
None
}
pub unsafe fn init() -> Option<Guard> {
None
}
}
#[cfg(any(
target_os = "linux",
target_os = "freebsd",
target_os = "macos",
target_os = "netbsd",
target_os = "openbsd",
target_os = "solaris"
))]
#[cfg_attr(test, allow(dead_code))]
pub mod guard {
#[cfg(not(all(target_os = "linux", target_env = "gnu")))]
use libc::{mmap as mmap64, mprotect};
#[cfg(all(target_os = "linux", target_env = "gnu"))]
use libc::{mmap64, mprotect};
use libc::{MAP_ANON, MAP_FAILED, MAP_FIXED, MAP_PRIVATE, PROT_NONE, PROT_READ, PROT_WRITE};
use crate::io;
use crate::ops::Range;
use crate::sync::atomic::{AtomicUsize, Ordering};
use crate::sys::os;
static PAGE_SIZE: AtomicUsize = AtomicUsize::new(0);
pub type Guard = Range<usize>;
#[cfg(target_os = "solaris")]
unsafe fn get_stack_start() -> Option<*mut libc::c_void> {
let mut current_stack: libc::stack_t = crate::mem::zeroed();
assert_eq!(libc::stack_getbounds(&mut current_stack), 0);
Some(current_stack.ss_sp)
}
#[cfg(target_os = "macos")]
unsafe fn get_stack_start() -> Option<*mut libc::c_void> {
let th = libc::pthread_self();
let stackptr = libc::pthread_get_stackaddr_np(th);
Some(stackptr.map_addr(|addr| addr - libc::pthread_get_stacksize_np(th)))
}
#[cfg(target_os = "openbsd")]
unsafe fn get_stack_start() -> Option<*mut libc::c_void> {
let mut current_stack: libc::stack_t = crate::mem::zeroed();
assert_eq!(libc::pthread_stackseg_np(libc::pthread_self(), &mut current_stack), 0);
let stack_ptr = current_stack.ss_sp;
let stackaddr = if libc::pthread_main_np() == 1 {
stack_ptr.addr() - current_stack.ss_size + PAGE_SIZE.load(Ordering::Relaxed)
} else {
stack_ptr.addr() - current_stack.ss_size
};
Some(stack_ptr.with_addr(stackaddr))
}
#[cfg(any(
target_os = "android",
target_os = "freebsd",
target_os = "linux",
target_os = "netbsd",
target_os = "l4re"
))]
unsafe fn get_stack_start() -> Option<*mut libc::c_void> {
let mut ret = None;
let mut attr: libc::pthread_attr_t = crate::mem::zeroed();
#[cfg(target_os = "freebsd")]
assert_eq!(libc::pthread_attr_init(&mut attr), 0);
#[cfg(target_os = "freebsd")]
let e = libc::pthread_attr_get_np(libc::pthread_self(), &mut attr);
#[cfg(not(target_os = "freebsd"))]
let e = libc::pthread_getattr_np(libc::pthread_self(), &mut attr);
if e == 0 {
let mut stackaddr = crate::ptr::null_mut();
let mut stacksize = 0;
assert_eq!(libc::pthread_attr_getstack(&attr, &mut stackaddr, &mut stacksize), 0);
ret = Some(stackaddr);
}
if e == 0 || cfg!(target_os = "freebsd") {
assert_eq!(libc::pthread_attr_destroy(&mut attr), 0);
}
ret
}
unsafe fn get_stack_start_aligned() -> Option<*mut libc::c_void> {
let page_size = PAGE_SIZE.load(Ordering::Relaxed);
assert!(page_size != 0);
let stackptr = get_stack_start()?;
let stackaddr = stackptr.addr();
let remainder = stackaddr % page_size;
Some(if remainder == 0 {
stackptr
} else {
stackptr.with_addr(stackaddr + page_size - remainder)
})
}
pub unsafe fn init() -> Option<Guard> {
let page_size = os::page_size();
PAGE_SIZE.store(page_size, Ordering::Relaxed);
if cfg!(all(target_os = "linux", not(target_env = "musl"))) {
let stackptr = get_stack_start_aligned()?;
let stackaddr = stackptr.addr();
Some(stackaddr - page_size..stackaddr)
} else if cfg!(all(target_os = "linux", target_env = "musl")) {
None
} else if cfg!(target_os = "freebsd") {
let stackptr = get_stack_start_aligned()?;
let guardaddr = stackptr.addr();
const GUARD_PAGES: usize = 1;
let guard = guardaddr..guardaddr + GUARD_PAGES * page_size;
Some(guard)
} else if cfg!(target_os = "openbsd") {
let stackptr = get_stack_start_aligned()?;
let stackaddr = stackptr.addr();
Some(stackaddr - page_size..stackaddr)
} else {
let stackptr = get_stack_start_aligned()?;
let result = mmap64(
stackptr,
page_size,
PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_ANON | MAP_FIXED,
-1,
0,
);
if result != stackptr || result == MAP_FAILED {
panic!("failed to allocate a guard page: {}", io::Error::last_os_error());
}
let result = mprotect(stackptr, page_size, PROT_NONE);
if result != 0 {
panic!("failed to protect the guard page: {}", io::Error::last_os_error());
}
let guardaddr = stackptr.addr();
Some(guardaddr..guardaddr + page_size)
}
}
#[cfg(any(target_os = "macos", target_os = "openbsd", target_os = "solaris"))]
pub unsafe fn current() -> Option<Guard> {
let stackptr = get_stack_start()?;
let stackaddr = stackptr.addr();
Some(stackaddr - PAGE_SIZE.load(Ordering::Relaxed)..stackaddr)
}
#[cfg(any(
target_os = "android",
target_os = "freebsd",
target_os = "linux",
target_os = "netbsd",
target_os = "l4re"
))]
pub unsafe fn current() -> Option<Guard> {
let mut ret = None;
let mut attr: libc::pthread_attr_t = crate::mem::zeroed();
#[cfg(target_os = "freebsd")]
assert_eq!(libc::pthread_attr_init(&mut attr), 0);
#[cfg(target_os = "freebsd")]
let e = libc::pthread_attr_get_np(libc::pthread_self(), &mut attr);
#[cfg(not(target_os = "freebsd"))]
let e = libc::pthread_getattr_np(libc::pthread_self(), &mut attr);
if e == 0 {
let mut guardsize = 0;
assert_eq!(libc::pthread_attr_getguardsize(&attr, &mut guardsize), 0);
if guardsize == 0 {
if cfg!(all(target_os = "linux", target_env = "musl")) {
guardsize = PAGE_SIZE.load(Ordering::Relaxed);
} else {
panic!("there is no guard page");
}
}
let mut stackptr = crate::ptr::null_mut::<libc::c_void>();
let mut size = 0;
assert_eq!(libc::pthread_attr_getstack(&attr, &mut stackptr, &mut size), 0);
let stackaddr = stackptr.addr();
ret = if cfg!(any(target_os = "freebsd", target_os = "netbsd")) {
Some(stackaddr - guardsize..stackaddr)
} else if cfg!(all(target_os = "linux", target_env = "musl")) {
Some(stackaddr - guardsize..stackaddr)
} else if cfg!(all(target_os = "linux", any(target_env = "gnu", target_env = "uclibc")))
{
Some(stackaddr - guardsize..stackaddr + guardsize)
} else {
Some(stackaddr..stackaddr + guardsize)
};
}
if e == 0 || cfg!(target_os = "freebsd") {
assert_eq!(libc::pthread_attr_destroy(&mut attr), 0);
}
ret
}
}
#[cfg(all(target_os = "linux", target_env = "gnu"))]
fn min_stack_size(attr: *const libc::pthread_attr_t) -> usize {
dlsym!(fn __pthread_get_minstack(*const libc::pthread_attr_t) -> libc::size_t);
match __pthread_get_minstack.get() {
None => libc::PTHREAD_STACK_MIN,
Some(f) => unsafe { f(attr) },
}
}
#[cfg(all(not(all(target_os = "linux", target_env = "gnu")), not(target_os = "netbsd")))]
fn min_stack_size(_: *const libc::pthread_attr_t) -> usize {
libc::PTHREAD_STACK_MIN
}
#[cfg(target_os = "netbsd")]
fn min_stack_size(_: *const libc::pthread_attr_t) -> usize {
2048 }