sgx_trts/src/thread/task.rs

// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements.  See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.  The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License.  You may obtain a copy of the License at
//
//   http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied.  See the License for the
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// under the License..

use crate::sync::SpinMutex;
use crate::thread::Thread;
use alloc::boxed::Box;
use alloc::collections::linked_list::LinkedList;
use core::ffi::c_void;

static mut TASK_QUEUE: SpinMutex<LinkedList<Task>> = SpinMutex::new(LinkedList::new());

pub struct Task {
    p: Box<dyn FnOnce(*mut c_void) -> *mut c_void>,
    arg: *mut c_void,
    thread: Thread,
}

impl Task {
    pub fn new(
        p: Box<dyn FnOnce(*mut c_void) -> *mut c_void>,
        arg: *mut c_void,
        thread: Thread,
    ) -> Task {
        Task { p, arg, thread }
    }

    pub fn run(self) {
        let retval = (self.p)(self.arg);
        self.thread.set_retval(retval);
    }

    pub fn thread(&self) -> &Thread {
        &self.thread
    }
}

pub fn push(task: Task) {
    unsafe {
        TASK_QUEUE.lock().push_back(task);
    }
}

pub fn pop() -> Option<Task> {
    unsafe { TASK_QUEUE.lock().pop_front() }
}