c34fbfaad3
This commit applies rustfmt with rust-lang/rust's default settings to files in src/libstd/sys *that are not involved in any currently open PR* to minimize merge conflicts. THe list of files involved in open PRs was determined by querying GitHub's GraphQL API with this script: https://gist.github.com/dtolnay/aa9c34993dc051a4f344d1b10e4487e8 With the list of files from the script in outstanding_files, the relevant commands were: $ find src/libstd/sys -name '*.rs' \ | xargs rustfmt --edition=2018 --unstable-features --skip-children $ rg libstd/sys outstanding_files | xargs git checkout -- Repeating this process several months apart should get us coverage of most of the rest of the files. To confirm no funny business: $ git checkout $THIS_COMMIT^ $ git show --pretty= --name-only $THIS_COMMIT \ | xargs rustfmt --edition=2018 --unstable-features --skip-children $ git diff $THIS_COMMIT # there should be no difference
93 lines
2.6 KiB
Rust
93 lines
2.6 KiB
Rust
#![cfg_attr(test, allow(dead_code))] // why is this necessary?
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use crate::ffi::CStr;
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use crate::io;
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use crate::time::Duration;
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use super::abi::usercalls;
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pub struct Thread(task_queue::JoinHandle);
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pub const DEFAULT_MIN_STACK_SIZE: usize = 4096;
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mod task_queue {
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use crate::sync::mpsc;
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use crate::sync::{Mutex, MutexGuard, Once};
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pub type JoinHandle = mpsc::Receiver<()>;
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pub(super) struct Task {
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p: Box<dyn FnOnce()>,
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done: mpsc::Sender<()>,
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}
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impl Task {
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pub(super) fn new(p: Box<dyn FnOnce()>) -> (Task, JoinHandle) {
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let (done, recv) = mpsc::channel();
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(Task { p, done }, recv)
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}
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pub(super) fn run(self) {
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(self.p)();
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let _ = self.done.send(());
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}
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}
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#[cfg_attr(test, linkage = "available_externally")]
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#[export_name = "_ZN16__rust_internals3std3sys3sgx6thread15TASK_QUEUE_INITE"]
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static TASK_QUEUE_INIT: Once = Once::new();
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#[cfg_attr(test, linkage = "available_externally")]
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#[export_name = "_ZN16__rust_internals3std3sys3sgx6thread10TASK_QUEUEE"]
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static mut TASK_QUEUE: Option<Mutex<Vec<Task>>> = None;
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pub(super) fn lock() -> MutexGuard<'static, Vec<Task>> {
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unsafe {
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TASK_QUEUE_INIT.call_once(|| TASK_QUEUE = Some(Default::default()));
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TASK_QUEUE.as_ref().unwrap().lock().unwrap()
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}
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}
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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 mut queue_lock = task_queue::lock();
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usercalls::launch_thread()?;
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let (task, handle) = task_queue::Task::new(p);
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queue_lock.push(task);
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Ok(Thread(handle))
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}
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pub(super) fn entry() {
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let mut pending_tasks = task_queue::lock();
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let task = rtunwrap!(Some, pending_tasks.pop());
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drop(pending_tasks); // make sure to not hold the task queue lock longer than necessary
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task.run()
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}
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pub fn yield_now() {
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let wait_error = rtunwrap!(Err, usercalls::wait(0, usercalls::raw::WAIT_NO));
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rtassert!(wait_error.kind() == io::ErrorKind::WouldBlock);
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}
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pub fn set_name(_name: &CStr) {
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// FIXME: could store this pointer in TLS somewhere
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}
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pub fn sleep(_dur: Duration) {
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rtabort!("can't sleep"); // FIXME
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}
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pub fn join(self) {
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let _ = self.0.recv();
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}
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}
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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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