110 lines
3.3 KiB
Rust
110 lines
3.3 KiB
Rust
use crate::ffi::CStr;
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use crate::io;
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use crate::ptr;
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use crate::sys::c;
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use crate::sys::handle::Handle;
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use crate::sys::stack_overflow;
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use crate::time::Duration;
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use libc::c_void;
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use super::to_u16s;
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pub const DEFAULT_MIN_STACK_SIZE: usize = 2 * 1024 * 1024;
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pub struct Thread {
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handle: Handle,
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}
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impl Thread {
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// unsafe: see thread::Builder::spawn_unchecked for safety requirements
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pub unsafe fn new(stack: usize, p: Box<dyn FnOnce()>) -> io::Result<Thread> {
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let p = Box::into_raw(box p);
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// FIXME On UNIX, we guard against stack sizes that are too small but
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// that's because pthreads enforces that stacks are at least
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// PTHREAD_STACK_MIN bytes big. Windows has no such lower limit, it's
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// just that below a certain threshold you can't do anything useful.
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// That threshold is application and architecture-specific, however.
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// Round up to the next 64 kB because that's what the NT kernel does,
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// might as well make it explicit.
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let stack_size = (stack + 0xfffe) & (!0xfffe);
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let ret = c::CreateThread(
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ptr::null_mut(),
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stack_size,
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thread_start,
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p as *mut _,
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c::STACK_SIZE_PARAM_IS_A_RESERVATION,
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ptr::null_mut(),
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);
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return if ret as usize == 0 {
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// The thread failed to start and as a result p was not consumed. Therefore, it is
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// safe to reconstruct the box so that it gets deallocated.
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drop(Box::from_raw(p));
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Err(io::Error::last_os_error())
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} else {
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Ok(Thread { handle: Handle::new(ret) })
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};
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extern "system" fn thread_start(main: *mut c_void) -> c::DWORD {
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unsafe {
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// Next, set up our stack overflow handler which may get triggered if we run
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// out of stack.
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let _handler = stack_overflow::Handler::new();
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// Finally, let's run some code.
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Box::from_raw(main as *mut Box<dyn FnOnce()>)();
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}
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0
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}
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}
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pub fn set_name(name: &CStr) {
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if let Ok(utf8) = name.to_str() {
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if let Ok(utf16) = to_u16s(utf8) {
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unsafe {
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c::SetThreadDescription(c::GetCurrentThread(), utf16.as_ptr());
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};
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};
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};
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}
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pub fn join(self) {
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let rc = unsafe { c::WaitForSingleObject(self.handle.raw(), c::INFINITE) };
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if rc == c::WAIT_FAILED {
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panic!("failed to join on thread: {}", io::Error::last_os_error());
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}
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}
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pub fn yield_now() {
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// This function will return 0 if there are no other threads to execute,
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// but this also means that the yield was useless so this isn't really a
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// case that needs to be worried about.
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unsafe {
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c::SwitchToThread();
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}
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}
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pub fn sleep(dur: Duration) {
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unsafe { c::Sleep(super::dur2timeout(dur)) }
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}
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pub fn handle(&self) -> &Handle {
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&self.handle
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}
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pub fn into_handle(self) -> Handle {
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self.handle
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}
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}
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#[cfg_attr(test, allow(dead_code))]
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pub mod guard {
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pub type Guard = !;
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pub unsafe fn current() -> Option<Guard> {
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None
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}
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pub unsafe fn init() -> Option<Guard> {
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None
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}
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}
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