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use boxed::FnBox;
use cmp;
use ffi::CStr;
use io;
use libc;
use mem;
use ptr;
use sys::os;
use time::Duration;
use sys_common::thread::*;
#[cfg(not(target_os = "l4re"))]
pub const DEFAULT_MIN_STACK_SIZE: usize = 2 * 1024 * 1024;
#[cfg(target_os = "l4re")]
pub const DEFAULT_MIN_STACK_SIZE: usize = 1024 * 1024;
pub struct Thread {
id: libc::pthread_t,
}
unsafe impl Send for Thread {}
unsafe impl Sync for Thread {}
#[cfg(not(target_os = "emscripten"))]
unsafe fn pthread_attr_setstacksize(attr: *mut libc::pthread_attr_t,
stack_size: libc::size_t) -> libc::c_int {
libc::pthread_attr_setstacksize(attr, stack_size)
}
#[cfg(target_os = "emscripten")]
unsafe fn pthread_attr_setstacksize(_attr: *mut libc::pthread_attr_t,
_stack_size: libc::size_t) -> libc::c_int {
panic!()
}
impl Thread {
pub unsafe fn new<'a>(stack: usize, p: Box<dyn FnBox() + 'a>)
-> io::Result<Thread> {
let p = box 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);
let stack_size = cmp::max(stack, min_stack_size(&attr));
match 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 *const _ as *mut _);
assert_eq!(libc::pthread_attr_destroy(&mut attr), 0);
return if ret != 0 {
Err(io::Error::from_raw_os_error(ret))
} else {
mem::forget(p);
Ok(Thread { id: native })
};
extern fn thread_start(main: *mut libc::c_void) -> *mut libc::c_void {
unsafe { start_thread(main as *mut u8); }
ptr::null_mut()
}
}
pub fn yield_now() {
let ret = unsafe { libc::sched_yield() };
debug_assert_eq!(ret, 0);
}
#[cfg(any(target_os = "linux",
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() as libc::c_ulong, 0, 0, 0);
}
}
#[cfg(any(target_os = "freebsd",
target_os = "dragonfly",
target_os = "bitrig",
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"))]
pub fn set_name(name: &CStr) {
unsafe {
libc::pthread_setname_np(name.as_ptr());
}
}
#[cfg(target_os = "netbsd")]
pub fn set_name(name: &CStr) {
use ffi::CString;
let cname = CString::new(&b"%s"[..]).unwrap();
unsafe {
libc::pthread_setname_np(libc::pthread_self(), cname.as_ptr(),
name.as_ptr() as *mut libc::c_void);
}
}
#[cfg(any(target_env = "newlib",
target_os = "solaris",
target_os = "haiku",
target_os = "l4re",
target_os = "emscripten",
target_os = "hermit"))]
pub fn set_name(_name: &CStr) {
}
#[cfg(target_os = "fuchsia")]
pub fn set_name(_name: &CStr) {
}
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_value() as u64, secs) as libc::time_t,
tv_nsec: nsecs,
};
secs -= ts.tv_sec as u64;
if libc::nanosleep(&ts, &mut ts) == -1 {
assert_eq!(os::errno(), libc::EINTR);
secs += ts.tv_sec as u64;
nsecs = ts.tv_nsec;
} else {
nsecs = 0;
}
}
}
}
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(all(not(all(target_os = "linux", not(target_env = "musl"))),
not(target_os = "freebsd"),
not(target_os = "macos"),
not(target_os = "bitrig"),
not(all(target_os = "netbsd", not(target_vendor = "rumprun"))),
not(target_os = "openbsd"),
not(target_os = "solaris")))]
#[cfg_attr(test, allow(dead_code))]
pub mod guard {
use ops::Range;
pub type Guard = Range<usize>;
pub unsafe fn current() -> Option<Guard> { None }
pub unsafe fn init() -> Option<Guard> { None }
pub unsafe fn deinit() {}
}
#[cfg(any(all(target_os = "linux", not(target_env = "musl")),
target_os = "freebsd",
target_os = "macos",
target_os = "bitrig",
all(target_os = "netbsd", not(target_vendor = "rumprun")),
target_os = "openbsd",
target_os = "solaris"))]
#[cfg_attr(test, allow(dead_code))]
pub mod guard {
use libc;
use libc::{mmap, mprotect};
use libc::{PROT_NONE, PROT_READ, PROT_WRITE, MAP_PRIVATE, MAP_ANON, MAP_FAILED, MAP_FIXED};
use ops::Range;
use sys::os;
static mut PAGE_SIZE: usize = 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 = ::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 stackaddr = libc::pthread_get_stackaddr_np(libc::pthread_self()) as usize -
libc::pthread_get_stacksize_np(libc::pthread_self());
Some(stackaddr as *mut libc::c_void)
}
#[cfg(any(target_os = "openbsd", target_os = "bitrig"))]
unsafe fn get_stack_start() -> Option<*mut libc::c_void> {
let mut current_stack: libc::stack_t = ::mem::zeroed();
assert_eq!(libc::pthread_stackseg_np(libc::pthread_self(),
&mut current_stack), 0);
let extra = if cfg!(target_os = "bitrig") {3} else {1} * PAGE_SIZE;
let stackaddr = if libc::pthread_main_np() == 1 {
current_stack.ss_sp as usize - current_stack.ss_size + extra
} else {
current_stack.ss_sp as usize - current_stack.ss_size
};
Some(stackaddr as *mut libc::c_void)
}
#[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 = ::mem::zeroed();
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 = ::ptr::null_mut();
let mut stacksize = 0;
assert_eq!(libc::pthread_attr_getstack(&attr, &mut stackaddr,
&mut stacksize), 0);
ret = Some(stackaddr);
}
assert_eq!(libc::pthread_attr_destroy(&mut attr), 0);
ret
}
unsafe fn get_stack_start_aligned() -> Option<*mut libc::c_void> {
assert!(PAGE_SIZE != 0);
let stackaddr = get_stack_start()?;
let remainder = (stackaddr as usize) % PAGE_SIZE;
Some(if remainder == 0 {
stackaddr
} else {
((stackaddr as usize) + PAGE_SIZE - remainder) as *mut libc::c_void
})
}
pub unsafe fn init() -> Option<Guard> {
PAGE_SIZE = os::page_size();
let stackaddr = get_stack_start_aligned()?;
if cfg!(target_os = "linux") {
let stackaddr = stackaddr as usize;
Some(stackaddr - PAGE_SIZE..stackaddr)
} else {
let result = mmap(stackaddr, PAGE_SIZE, PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_ANON | MAP_FIXED, -1, 0);
if result != stackaddr || result == MAP_FAILED {
panic!("failed to allocate a guard page");
}
let result = mprotect(stackaddr, PAGE_SIZE, PROT_NONE);
if result != 0 {
panic!("failed to protect the guard page");
}
let guardaddr = stackaddr as usize;
let offset = if cfg!(target_os = "freebsd") {
2
} else {
1
};
Some(guardaddr..guardaddr + offset * PAGE_SIZE)
}
}
pub unsafe fn deinit() {
if !cfg!(target_os = "linux") {
if let Some(stackaddr) = get_stack_start_aligned() {
let result = mprotect(stackaddr, PAGE_SIZE, PROT_READ | PROT_WRITE);
if result != 0 {
panic!("unable to reset the guard page");
}
}
}
}
#[cfg(any(target_os = "macos",
target_os = "bitrig",
target_os = "openbsd",
target_os = "solaris"))]
pub unsafe fn current() -> Option<Guard> {
let stackaddr = get_stack_start()? as usize;
Some(stackaddr - PAGE_SIZE..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 = ::mem::zeroed();
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 {
panic!("there is no guard page");
}
let mut stackaddr = ::ptr::null_mut();
let mut size = 0;
assert_eq!(libc::pthread_attr_getstack(&attr, &mut stackaddr,
&mut size), 0);
let stackaddr = stackaddr as usize;
ret = if cfg!(target_os = "freebsd") {
let guardaddr = stackaddr - guardsize;
Some(guardaddr - PAGE_SIZE..guardaddr)
} else if cfg!(target_os = "netbsd") {
Some(stackaddr - guardsize..stackaddr)
} else if cfg!(all(target_os = "linux", target_env = "gnu")) {
Some(stackaddr - guardsize..stackaddr + guardsize)
} else {
Some(stackaddr..stackaddr + guardsize)
};
}
assert_eq!(libc::pthread_attr_destroy(&mut attr), 0);
ret
}
}
#[cfg(target_os = "linux")]
#[allow(deprecated)]
fn min_stack_size(attr: *const libc::pthread_attr_t) -> usize {
weak!(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(target_os = "linux"),
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
}