third_party/rust_crates/vendor/parking_lot_core-0.3.1/src/thread_parker/linux.rs

// Copyright 2016 Amanieu d'Antras
//
// Licensed under the Apache License, Version 2.0, <LICENSE-APACHE or
// http://apache.org/licenses/LICENSE-2.0> or the MIT license <LICENSE-MIT or
// http://opensource.org/licenses/MIT>, at your option. This file may not be
// copied, modified, or distributed except according to those terms.

use libc;
use std::sync::atomic::{AtomicI32, Ordering};
use std::time::Instant;

const FUTEX_WAIT: i32 = 0;
const FUTEX_WAKE: i32 = 1;
const FUTEX_PRIVATE: i32 = 128;

// x32 Linux uses a non-standard type for tv_nsec in timespec.
// See https://sourceware.org/bugzilla/show_bug.cgi?id=16437
#[cfg(all(target_arch = "x86_64", target_pointer_width = "32"))]
#[allow(non_camel_case_types)]
type tv_nsec_t = i64;
#[cfg(not(all(target_arch = "x86_64", target_pointer_width = "32")))]
#[allow(non_camel_case_types)]
type tv_nsec_t = libc::c_long;

// Helper type for putting a thread to sleep until some other thread wakes it up
pub struct ThreadParker {
    futex: AtomicI32,
}

impl ThreadParker {
    pub fn new() -> ThreadParker {
        ThreadParker {
            futex: AtomicI32::new(0),
        }
    }

    // Prepares the parker. This should be called before adding it to the queue.
    pub unsafe fn prepare_park(&self) {
        self.futex.store(1, Ordering::Relaxed);
    }

    // Checks if the park timed out. This should be called while holding the
    // queue lock after park_until has returned false.
    pub unsafe fn timed_out(&self) -> bool {
        self.futex.load(Ordering::Relaxed) != 0
    }

    // Parks the thread until it is unparked. This should be called after it has
    // been added to the queue, after unlocking the queue.
    pub unsafe fn park(&self) {
        while self.futex.load(Ordering::Acquire) != 0 {
            let r = libc::syscall(
                libc::SYS_futex,
                &self.futex,
                FUTEX_WAIT | FUTEX_PRIVATE,
                1,
                0,
            );
            debug_assert!(r == 0 || r == -1);
            if r == -1 {
                debug_assert!(
                    *libc::__errno_location() == libc::EINTR
                        || *libc::__errno_location() == libc::EAGAIN
                );
            }
        }
    }

    // Parks the thread until it is unparked or the timeout is reached. This
    // should be called after it has been added to the queue, after unlocking
    // the queue. Returns true if we were unparked and false if we timed out.
    pub unsafe fn park_until(&self, timeout: Instant) -> bool {
        while self.futex.load(Ordering::Acquire) != 0 {
            let now = Instant::now();
            if timeout <= now {
                return false;
            }
            let diff = timeout - now;
            if diff.as_secs() as libc::time_t as u64 != diff.as_secs() {
                // Timeout overflowed, just sleep indefinitely
                self.park();
                return true;
            }
            let ts = libc::timespec {
                tv_sec: diff.as_secs() as libc::time_t,
                tv_nsec: diff.subsec_nanos() as tv_nsec_t,
            };
            let r = libc::syscall(
                libc::SYS_futex,
                &self.futex,
                FUTEX_WAIT | FUTEX_PRIVATE,
                1,
                &ts,
            );
            debug_assert!(r == 0 || r == -1);
            if r == -1 {
                debug_assert!(
                    *libc::__errno_location() == libc::EINTR
                        || *libc::__errno_location() == libc::EAGAIN
                        || *libc::__errno_location() == libc::ETIMEDOUT
                );
            }
        }
        true
    }

    // Locks the parker to prevent the target thread from exiting. This is
    // necessary to ensure that thread-local ThreadData objects remain valid.
    // This should be called while holding the queue lock.
    pub unsafe fn unpark_lock(&self) -> UnparkHandle {
        // We don't need to lock anything, just clear the state
        self.futex.store(0, Ordering::Release);

        UnparkHandle { futex: &self.futex }
    }
}

// Handle for a thread that is about to be unparked. We need to mark the thread
// as unparked while holding the queue lock, but we delay the actual unparking
// until after the queue lock is released.
pub struct UnparkHandle {
    futex: *const AtomicI32,
}

impl UnparkHandle {
    // Wakes up the parked thread. This should be called after the queue lock is
    // released to avoid blocking the queue for too long.
    pub unsafe fn unpark(self) {
        // The thread data may have been freed at this point, but it doesn't
        // matter since the syscall will just return EFAULT in that case.
        let r = libc::syscall(libc::SYS_futex, self.futex, FUTEX_WAKE | FUTEX_PRIVATE, 1);
        debug_assert!(r == 0 || r == 1 || r == -1);
        if r == -1 {
            debug_assert_eq!(*libc::__errno_location(), libc::EFAULT);
        }
    }
}