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split Thread to CurrentThread, refactor exception

This commit is contained in:
Runji Wang 2020-08-14 01:24:26 +08:00
parent 33d4836912
commit abe4792691
10 changed files with 218 additions and 195 deletions
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4
linux-loader/src/lib.rs
View File

@ -53,7 +53,7 @@ pub fn run(args: Vec<String>, envs: Vec<String>, rootfs: Arc<dyn FileSystem>) ->
/// - enter user mode
/// - handle trap/interrupt/syscall according to the return value
/// - return the context to the user thread
fn spawn(thread: Arc<Thread>) {
fn spawn(thread: CurrentThread) {
let vmtoken = thread.proc().vmar().table_phys();
let future = async move {
loop {
@ -102,7 +102,7 @@ fn spawn(thread: Arc<Thread>) {
}
/// syscall handler entry: create a struct `syscall: Syscall`, and call `syscall.syscall()`
async fn handle_syscall(thread: &Arc<Thread>, regs: &mut GeneralRegs) -> bool {
async fn handle_syscall(thread: &CurrentThread, regs: &mut GeneralRegs) -> bool {
trace!("syscall: {:#x?}", regs);
let num = regs.rax as u32;
let args = [regs.rdi, regs.rsi, regs.rdx, regs.r10, regs.r8, regs.r9];

8
linux-object/src/thread.rs
View File

@ -5,7 +5,7 @@ use alloc::sync::Arc;
use kernel_hal::user::{Out, UserOutPtr, UserPtr};
use kernel_hal::VirtAddr;
use spin::{Mutex, MutexGuard};
use zircon_object::task::{Process, Thread};
use zircon_object::task::{CurrentThread, Process, Thread};
use zircon_object::ZxResult;
/// Thread extension for linux
@ -16,6 +16,10 @@ pub trait ThreadExt {
fn lock_linux(&self) -> MutexGuard<'_, LinuxThread>;
/// Set pointer to thread ID.
fn set_tid_address(&self, tidptr: UserOutPtr<i32>);
}
/// CurrentThread extension for linux
pub trait CurrentThreadExt {
/// exit linux thread
fn exit_linux(&self, exit_code: i32);
}
@ -39,7 +43,9 @@ impl ThreadExt for Thread {
fn set_tid_address(&self, tidptr: UserPtr<i32, Out>) {
self.lock_linux().clear_child_tid = tidptr;
}
}
impl CurrentThreadExt for CurrentThread {
/// Exit current thread for Linux.
fn exit_linux(&self, _exit_code: i32) {
let mut linux_thread = self.lock_linux();

4
linux-syscall/src/lib.rs
View File

@ -54,13 +54,13 @@ mod vm;
/// The struct of Syscall which stores the information about making a syscall
pub struct Syscall<'a> {
/// the thread making a syscall
pub thread: &'a Arc<Thread>,
pub thread: &'a CurrentThread,
/// the entry of current syscall
pub syscall_entry: VirtAddr,
/// store the regs statues
pub regs: &'a mut GeneralRegs,
/// the spawn function in linux-loader
pub spawn_fn: fn(thread: Arc<Thread>),
pub spawn_fn: fn(thread: CurrentThread),
/// Set `true` to exit current task.
pub exit: bool,
}

2
linux-syscall/src/task.rs
View File

@ -15,7 +15,7 @@ use bitflags::bitflags;
use core::fmt::Debug;
use linux_object::fs::INodeExt;
use linux_object::loader::LinuxElfLoader;
use linux_object::thread::ThreadExt;
use linux_object::thread::{CurrentThreadExt, ThreadExt};
impl Syscall<'_> {
/// Fork the current process. Return the child's PID.

25
zircon-loader/src/lib.rs
View File

@ -172,22 +172,17 @@ kcounter!(EXCEPTIONS_USER, "exceptions.user");
kcounter!(EXCEPTIONS_TIMER, "exceptions.timer");
kcounter!(EXCEPTIONS_PGFAULT, "exceptions.pgfault");
fn spawn(thread: Arc<Thread>) {
fn spawn(thread: CurrentThread) {
let vmtoken = thread.proc().vmar().table_phys();
let future = async move {
kernel_hal::Thread::set_tid(thread.id(), thread.proc().id());
if thread.is_first_thread() {
Exception::create(&thread, ExceptionType::ProcessStarting, None)
.handle_with_exceptionates(
false,
JobDebuggerIterator::new(thread.proc().job()),
true,
)
.await;
let exception = Exception::create(&thread, ExceptionType::ProcessStarting, None);
thread.wait_for_exception_handling(exception).await;
};
Exception::create(&thread, ExceptionType::ThreadStarting, None)
.handle_with_exceptionates(false, Some(thread.proc().debug_exceptionate()), false)
.await;
let exception = Exception::create(&thread, ExceptionType::ThreadStarting, None);
thread.wait_for_exception_handling(exception).await;
loop {
let mut cx = thread.wait_for_run().await;
if thread.state() == ThreadState::Dying {
@ -243,7 +238,7 @@ fn spawn(thread: Arc<Thread>) {
error!("Page Fault from user mode: {:#x?}", cx);
let exception =
Exception::create(&thread, ExceptionType::FatalPageFault, Some(&cx));
exception.handle(true).await;
thread.wait_for_exception_handling(exception).await;
}
}
0x8 => {
@ -259,7 +254,7 @@ fn spawn(thread: Arc<Thread>) {
};
error!("User mode exception: {:?} {:#x?}", type_, cx);
let exception = Exception::create(&thread, type_, Some(&cx));
exception.handle(true).await;
thread.wait_for_exception_handling(exception).await;
}
}
thread.end_running(cx);
@ -277,7 +272,7 @@ fn spawn(thread: Arc<Thread>) {
kernel_hal::Thread::spawn(Box::pin(future), vmtoken);
}
async fn handle_syscall(thread: &Arc<Thread>, regs: &mut GeneralRegs) {
async fn handle_syscall(thread: &CurrentThread, regs: &mut GeneralRegs) {
#[cfg(target_arch = "x86_64")]
let num = regs.rax as u32;
#[cfg(target_arch = "aarch64")]
@ -305,7 +300,7 @@ async fn handle_syscall(thread: &Arc<Thread>, regs: &mut GeneralRegs) {
];
let mut syscall = Syscall {
regs,
thread: thread.clone(),
thread,
spawn_fn: spawn,
};
let ret = syscall.syscall(num, args).await as usize;

54
zircon-object/src/task/exception.rs
View File

@ -1,7 +1,6 @@
use {
super::*, crate::ipc::*, crate::object::*, alloc::sync::Arc, alloc::vec, alloc::vec::Vec,
core::mem::size_of, futures::channel::oneshot, futures::pin_mut, kernel_hal::UserContext,
spin::Mutex,
core::mem::size_of, futures::channel::oneshot, kernel_hal::UserContext, spin::Mutex,
};
/// Kernel-owned exception channel endpoint.
@ -197,6 +196,12 @@ pub enum ExceptionType {
ProcessStarting = 0x8308,
}
impl ExceptionType {
fn is_fatal(self) -> bool {
(self as u32) < 0x1000
}
}
/// Type of the exception channel
#[repr(u32)]
#[derive(Copy, Clone, Debug, PartialEq, Eq)]
@ -341,31 +346,32 @@ impl Exception {
///
/// Note that it's possible that this may returns before exception was send to any exception channel.
/// This happens only when the thread is killed before we send the exception.
pub async fn handle(self: &Arc<Self>, fatal: bool) {
self.handle_with_exceptionates(fatal, ExceptionateIterator::new(self), false)
.await
}
/// Same as `handle`, but use a customized iterator.
///
/// If `first_only` is true, this will only send exception to the first one that received the exception
/// even when the exception is not handled.
pub async fn handle_with_exceptionates(
self: &Arc<Self>,
fatal: bool,
exceptionates: impl IntoIterator<Item = Arc<Exceptionate>>,
first_only: bool,
) {
let future = self.handle_internal(exceptionates, first_only);
pin_mut!(future);
let result = self.thread.wait_for_exception(future, self.clone()).await;
if result == Err(ZxError::NEXT) && fatal {
pub(super) async fn handle(self: &Arc<Self>) {
let result = match self.type_ {
ExceptionType::ProcessStarting => {
self.handle_with(JobDebuggerIterator::new(self.thread.proc().job()), true)
.await
}
ExceptionType::ThreadStarting | ExceptionType::ThreadExiting => {
self.handle_with(Some(self.thread.proc().debug_exceptionate()), false)
.await
}
_ => {
self.handle_with(ExceptionateIterator::new(self), false)
.await
}
};
if result == Err(ZxError::NEXT) && self.type_.is_fatal() {
// Nobody handled the exception, kill myself
self.thread.proc().exit(TASK_RETCODE_SYSCALL_KILL);
}
}
async fn handle_internal(
/// Handle the exception with a customized iterator.
///
/// If `first_only` is true, this will only send exception to the first one that received the exception
/// even when the exception is not handled.
async fn handle_with(
self: &Arc<Self>,
exceptionates: impl IntoIterator<Item = Arc<Exceptionate>>,
first_only: bool,
@ -479,13 +485,13 @@ impl<'a> Iterator for ExceptionateIterator<'a> {
}
/// This is only used by ProcessStarting exceptions
pub struct JobDebuggerIterator {
struct JobDebuggerIterator {
job: Option<Arc<Job>>,
}
impl JobDebuggerIterator {
/// Create a new JobDebuggerIterator
pub fn new(job: Arc<Job>) -> Self {
fn new(job: Arc<Job>) -> Self {
JobDebuggerIterator { job: Some(job) }
}
}

3
zircon-object/src/task/process.rs
View File

@ -115,7 +115,6 @@ impl Process {
name: &str,
ext: impl Any + Send + Sync,
) -> ZxResult<Arc<Self>> {
// TODO: _options -> options
let proc = Arc::new(Process {
base: KObjectBase::with_name(name),
_counter: CountHelper::new(),
@ -145,7 +144,7 @@ impl Process {
stack: usize,
arg1: Option<Handle>,
arg2: usize,
spawn_fn: fn(thread: Arc<Thread>),
spawn_fn: fn(thread: CurrentThread),
) -> ZxResult {
let handle_value;
{

300
zircon-object/src/task/thread.rs
View File

@ -8,11 +8,12 @@ use {
core::{
any::Any,
future::Future,
ops::Deref,
pin::Pin,
task::{Context, Poll, Waker},
time::Duration,
},
futures::{channel::oneshot::*, future::FutureExt, select_biased},
futures::{channel::oneshot::*, future::FutureExt, pin_mut, select_biased},
kernel_hal::{sleep_until, GeneralRegs, UserContext},
spin::Mutex,
};
@ -216,7 +217,7 @@ impl Thread {
stack: usize,
arg1: usize,
arg2: usize,
spawn_fn: fn(thread: Arc<Thread>),
spawn_fn: fn(thread: CurrentThread),
) -> ZxResult {
{
let mut inner = self.inner.lock();
@ -239,7 +240,7 @@ impl Thread {
inner.state = ThreadState::Running;
inner.update_signal(&self.base);
}
spawn_fn(self.clone());
spawn_fn(CurrentThread(self.clone()));
Ok(())
}
@ -247,7 +248,7 @@ impl Thread {
pub fn start_with_regs(
self: &Arc<Self>,
regs: GeneralRegs,
spawn_fn: fn(thread: Arc<Thread>),
spawn_fn: fn(thread: CurrentThread),
) -> ZxResult {
{
let mut inner = self.inner.lock();
@ -261,7 +262,7 @@ impl Thread {
inner.update_signal(&self.base);
self.base.signal_set(Signal::THREAD_RUNNING);
}
spawn_fn(self.clone());
spawn_fn(CurrentThread(self.clone()));
Ok(())
}
@ -300,23 +301,6 @@ impl Thread {
}
}
/// Exit the thread.
/// The thread do not terminate immediately when exited. It is just made dying.
/// It will terminate after some cleanups (when `terminate` are called **explicitly** by upper layer).
pub fn exit(&self) {
self.stop(false);
}
/// Terminate the current running thread. This function should be called **explicitly**
/// by upper layer after cleanups are finished.
pub fn terminate(&self) {
let mut inner = self.inner.lock();
self.exceptionate.shutdown();
inner.state = ThreadState::Dead;
inner.update_signal(&self.base);
self.proc().remove_thread(self.base.id);
}
/// Read one aspect of thread state.
pub fn read_state(&self, kind: ThreadStateKind, buf: &mut [u8]) -> ZxResult<usize> {
let inner = self.inner.lock();
@ -331,38 +315,6 @@ impl Thread {
context.write_state(kind, buf)
}
/// Wait until the thread is ready to run (not suspended),
/// and then take away its context to run the thread.
pub fn wait_for_run(self: &Arc<Thread>) -> impl Future<Output = Box<UserContext>> {
#[must_use = "wait_for_run does nothing unless polled/`await`-ed"]
struct RunnableChecker {
thread: Arc<Thread>,
}
impl Future for RunnableChecker {
type Output = Box<UserContext>;
fn poll(self: Pin<&mut Self>, cx: &mut Context) -> Poll<Self::Output> {
let mut inner = self.thread.inner.lock();
if inner.suspend_count == 0 {
// resume: return the context token from thread object
Poll::Ready(inner.context.take().unwrap())
} else {
// suspend: put waker into the thread object
inner.waker = Some(cx.waker().clone());
Poll::Pending
}
}
}
RunnableChecker {
thread: self.clone(),
}
}
/// The thread ends running and takes back the context.
pub fn end_running(&self, context: Box<UserContext>) {
self.inner.lock().context = Some(context);
}
/// Get the thread's information.
pub fn get_thread_info(&self) -> ThreadInfo {
let inner = self.inner.lock();
@ -386,95 +338,6 @@ impl Thread {
Ok(report)
}
/// Run async future and change state while blocking.
pub async fn blocking_run<F, T, FT>(
&self,
future: F,
state: ThreadState,
deadline: Duration,
cancel_token: Option<Receiver<()>>,
) -> ZxResult<T>
where
F: Future<Output = FT> + Unpin,
FT: IntoResult<T>,
{
let (old_state, killed) = {
let mut inner = self.inner.lock();
if inner.get_state() == ThreadState::Dying {
return Err(ZxError::STOP);
}
let (sender, receiver) = channel();
inner.killer = Some(sender);
let old_state = core::mem::replace(&mut inner.state, state);
inner.update_signal(&self.base);
(old_state, receiver)
};
let ret = if let Some(cancel_token) = cancel_token {
select_biased! {
ret = future.fuse() => ret.into_result(),
_ = killed.fuse() => Err(ZxError::STOP),
_ = sleep_until(deadline).fuse() => Err(ZxError::TIMED_OUT),
_ = cancel_token.fuse() => Err(ZxError::CANCELED),
}
} else {
select_biased! {
ret = future.fuse() => ret.into_result(),
_ = killed.fuse() => Err(ZxError::STOP),
_ = sleep_until(deadline).fuse() => Err(ZxError::TIMED_OUT),
}
};
let mut inner = self.inner.lock();
inner.killer = None;
if inner.state == ThreadState::Dying {
return ret;
}
assert_eq!(inner.state, state);
inner.state = old_state;
inner.update_signal(&self.base);
ret
}
/// Run a blocking task when the thread is exited itself and dying.
///
/// The task will stop running if and once the thread is killed.
pub async fn dying_run<F, T, FT>(&self, future: F) -> ZxResult<T>
where
F: Future<Output = FT> + Unpin,
FT: IntoResult<T>,
{
let killed = {
let mut inner = self.inner.lock();
if inner.get_state() == ThreadState::Dead || inner.killed {
return Err(ZxError::STOP);
}
let (sender, receiver) = channel::<()>();
inner.killer = Some(sender);
receiver
};
select_biased! {
ret = future.fuse() => ret.into_result(),
_ = killed.fuse() => Err(ZxError::STOP),
}
}
pub(super) async fn wait_for_exception<T>(
&self,
future: impl Future<Output = ZxResult<T>> + Unpin,
exception: Arc<Exception>,
) -> ZxResult<T> {
self.inner.lock().exception = Some(exception);
let ret = self
.blocking_run(
future,
ThreadState::BlockedException,
Duration::from_nanos(u64::max_value()),
None,
)
.await;
self.inner.lock().exception = None;
ret
}
/// Get the thread state.
pub fn state(&self) -> ThreadState {
self.inner.lock().get_state()
@ -551,6 +414,157 @@ impl Task for Thread {
}
}
/// Current thread.
pub struct CurrentThread(Arc<Thread>);
impl Deref for CurrentThread {
type Target = Arc<Thread>;
fn deref(&self) -> &Self::Target {
&self.0
}
}
impl CurrentThread {
/// Exit the current thread.
///
/// The thread do not terminate immediately when exited. It is just made dying.
/// It will terminate after some cleanups (when `terminate` are called **explicitly** by upper layer).
pub fn exit(&self) {
self.stop(false);
}
/// Terminate the current running thread.
///
/// This function should be called **explicitly** by upper layer after cleanups are finished.
pub fn terminate(&self) {
let mut inner = self.inner.lock();
self.exceptionate.shutdown();
inner.state = ThreadState::Dead;
inner.update_signal(&self.base);
self.proc().remove_thread(self.base.id);
}
/// Wait until the thread is ready to run (not suspended),
/// and then take away its context to run the thread.
pub fn wait_for_run(&self) -> impl Future<Output = Box<UserContext>> {
#[must_use = "wait_for_run does nothing unless polled/`await`-ed"]
struct RunnableChecker {
thread: Arc<Thread>,
}
impl Future for RunnableChecker {
type Output = Box<UserContext>;
fn poll(self: Pin<&mut Self>, cx: &mut Context) -> Poll<Self::Output> {
let mut inner = self.thread.inner.lock();
if inner.suspend_count == 0 {
// resume: return the context token from thread object
Poll::Ready(inner.context.take().unwrap())
} else {
// suspend: put waker into the thread object
inner.waker = Some(cx.waker().clone());
Poll::Pending
}
}
}
RunnableChecker {
thread: self.0.clone(),
}
}
/// The thread ends running and takes back the context.
pub fn end_running(&self, context: Box<UserContext>) {
self.inner.lock().context = Some(context);
}
/// Run async future and change state while blocking.
pub async fn blocking_run<F, T, FT>(
&self,
future: F,
state: ThreadState,
deadline: Duration,
cancel_token: Option<Receiver<()>>,
) -> ZxResult<T>
where
F: Future<Output = FT> + Unpin,
FT: IntoResult<T>,
{
let (old_state, killed) = {
let mut inner = self.inner.lock();
if inner.get_state() == ThreadState::Dying {
return Err(ZxError::STOP);
}
let (sender, receiver) = channel();
inner.killer = Some(sender);
let old_state = core::mem::replace(&mut inner.state, state);
inner.update_signal(&self.base);
(old_state, receiver)
};
let ret = if let Some(cancel_token) = cancel_token {
select_biased! {
ret = future.fuse() => ret.into_result(),
_ = killed.fuse() => Err(ZxError::STOP),
_ = sleep_until(deadline).fuse() => Err(ZxError::TIMED_OUT),
_ = cancel_token.fuse() => Err(ZxError::CANCELED),
}
} else {
select_biased! {
ret = future.fuse() => ret.into_result(),
_ = killed.fuse() => Err(ZxError::STOP),
_ = sleep_until(deadline).fuse() => Err(ZxError::TIMED_OUT),
}
};
let mut inner = self.inner.lock();
inner.killer = None;
if inner.state == ThreadState::Dying {
return ret;
}
assert_eq!(inner.state, state);
inner.state = old_state;
inner.update_signal(&self.base);
ret
}
/// Blocked wait for exception handling.
pub async fn wait_for_exception_handling(&self, exception: Arc<Exception>) {
self.inner.lock().exception = Some(exception.clone());
let future = exception.handle();
pin_mut!(future);
self.blocking_run(
future,
ThreadState::BlockedException,
Duration::from_nanos(u64::max_value()),
None,
)
.await
.ok();
self.inner.lock().exception = None;
}
/// Run a blocking task when the thread is exited itself and dying.
///
/// The task will stop running if and once the thread is killed.
pub async fn dying_run<F, T, FT>(&self, future: F) -> ZxResult<T>
where
F: Future<Output = FT> + Unpin,
FT: IntoResult<T>,
{
let killed = {
let mut inner = self.inner.lock();
if inner.get_state() == ThreadState::Dead || inner.killed {
return Err(ZxError::STOP);
}
let (sender, receiver) = channel::<()>();
inner.killer = Some(sender);
receiver
};
select_biased! {
ret = future.fuse() => ret.into_result(),
_ = killed.fuse() => Err(ZxError::STOP),
}
}
}
/// `into_result` returns `Self` if the type parameter is already a `ZxResult`,
/// otherwise wraps the value in an `Ok`.
///

7
zircon-syscall/src/futex.rs
View File

@ -1,4 +1,7 @@
use {super::*, zircon_object::task::ThreadState};
use {
super::*,
zircon_object::task::{Thread, ThreadState},
};
impl Syscall<'_> {
/// Wait on a futex.
@ -27,7 +30,7 @@ impl Syscall<'_> {
} else {
Some(proc.get_object::<Thread>(new_futex_owner)?)
};
let future = futex.wait_with_owner(current_value, Some(self.thread.clone()), new_owner);
let future = futex.wait_with_owner(current_value, Some((*self.thread).clone()), new_owner);
self.thread
.blocking_run(future, ThreadState::BlockedFutex, deadline.into(), None)
.await?;

6
zircon-syscall/src/lib.rs
View File

@ -19,7 +19,7 @@ use {
futures::pin_mut,
kernel_hal::{user::*, GeneralRegs},
zircon_object::object::*,
zircon_object::task::Thread,
zircon_object::task::CurrentThread,
};
mod channel;
@ -51,8 +51,8 @@ use consts::SyscallType as Sys;
pub struct Syscall<'a> {
pub regs: &'a mut GeneralRegs,
pub thread: Arc<Thread>,
pub spawn_fn: fn(thread: Arc<Thread>),
pub thread: &'a CurrentThread,
pub spawn_fn: fn(thread: CurrentThread),
}
impl Syscall<'_> {