| // Copyright 2014-2018 The Rust Project Developers. See the COPYRIGHT |
| // file at the top-level directory of this distribution and at |
| // http://rust-lang.org/COPYRIGHT. |
| // |
| // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or |
| // http://www.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 boxed::FnBox; |
| use cmp; |
| use ffi::CStr; |
| use io; |
| use libc; |
| use mem; |
| use ptr; |
| use sys::cloudabi::abi; |
| use sys::time::dur2intervals; |
| use sys_common::thread::*; |
| use time::Duration; |
| |
| pub const DEFAULT_MIN_STACK_SIZE: usize = 2 * 1024 * 1024; |
| |
| pub struct Thread { |
| id: libc::pthread_t, |
| } |
| |
| // CloudABI has pthread_t as a pointer in which case we still want |
| // a thread to be Send/Sync |
| unsafe impl Send for Thread {} |
| unsafe impl Sync for Thread {} |
| |
| impl Thread { |
| // unsafe: see thread::Builder::spawn_unchecked for safety requirements |
| pub unsafe fn new(stack: usize, p: Box<dyn FnBox()>) -> 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)); |
| 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); // ownership passed to pthread_create |
| Ok(Thread { id: native }) |
| }; |
| |
| extern "C" 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 { abi::thread_yield() }; |
| debug_assert_eq!(ret, abi::errno::SUCCESS); |
| } |
| |
| pub fn set_name(_name: &CStr) { |
| // CloudABI has no way to set a thread name. |
| } |
| |
| pub fn sleep(dur: Duration) { |
| unsafe { |
| let subscription = abi::subscription { |
| type_: abi::eventtype::CLOCK, |
| union: abi::subscription_union { |
| clock: abi::subscription_clock { |
| clock_id: abi::clockid::MONOTONIC, |
| timeout: dur2intervals(&dur), |
| ..mem::zeroed() |
| }, |
| }, |
| ..mem::zeroed() |
| }; |
| let mut event: abi::event = mem::uninitialized(); |
| let mut nevents: usize = mem::uninitialized(); |
| let ret = abi::poll(&subscription, &mut event, 1, &mut nevents); |
| assert_eq!(ret, abi::errno::SUCCESS); |
| assert_eq!(event.error, abi::errno::SUCCESS); |
| } |
| } |
| |
| 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) |
| ); |
| } |
| } |
| } |
| |
| impl Drop for Thread { |
| fn drop(&mut self) { |
| let ret = unsafe { libc::pthread_detach(self.id) }; |
| debug_assert_eq!(ret, 0); |
| } |
| } |
| |
| #[cfg_attr(test, allow(dead_code))] |
| pub mod guard { |
| pub type Guard = !; |
| pub unsafe fn current() -> Option<Guard> { |
| None |
| } |
| pub unsafe fn init() -> Option<Guard> { |
| None |
| } |
| pub unsafe fn deinit() {} |
| } |
| |
| fn min_stack_size(_: *const libc::pthread_attr_t) -> usize { |
| libc::PTHREAD_STACK_MIN |
| } |