mirror of
https://github.com/rust-lang/rust.git
synced 2024-11-27 17:24:06 +00:00
Ben Blum
parent
152f2eade8
commit
5d6d3d0565
@ -26,6 +26,7 @@
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import result::result;
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import dvec::extensions;
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import dvec_iter::extensions;
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import arc::methods;
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export task;
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export task_result;
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@ -563,7 +564,11 @@ unsafe fn unkillable(f: fn()) {
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}
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/* Internal */
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/****************************************************************************
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* Internal
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****************************************************************************/
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/* spawning */
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type sched_id = int;
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type task_id = int;
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@ -573,42 +578,185 @@ type task_id = int;
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type rust_task = libc::c_void;
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type rust_closure = libc::c_void;
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fn spawn_raw(opts: task_opts, +f: fn~()) {
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/* linked failure */
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let mut f = if opts.supervise {
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f
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} else {
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// FIXME (#1868, #1789): The runtime supervision API is weird here
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// because it was designed to let the child unsupervise itself,
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// when what we actually want is for parents to unsupervise new
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// children.
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fn~() {
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rustrt::unsupervise();
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f();
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type taskgroup_arc = arc::exclusive<option<dvec::dvec<option<*rust_task>>>>;
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class taskgroup {
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// FIXME (#2816): Change dvec to an O(1) data structure (and change 'me'
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// to a node-handle or somesuch when so done (or remove the field entirely
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// if keyed by *rust_task)).
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let tasks: taskgroup_arc; // 'none' means the group already failed.
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let me: *rust_task;
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let my_pos: uint;
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// let parent_group: taskgroup_arc; // TODO(bblum)
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// TODO XXX bblum: add a list of empty slots to get runtime back
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let mut failed: bool;
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new(-tasks: taskgroup_arc, me: *rust_task, my_pos: uint) {
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self.tasks = tasks; self.me = me; self.my_pos = my_pos;
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self.failed = true; // This will get un-set on successful exit.
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}
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// Runs on task exit.
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drop {
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if self.failed {
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// Take everybody down with us.
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kill_taskgroup(self.tasks, self.me, self.my_pos);
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} else {
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// Remove ourselves from the group.
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leave_taskgroup(self.tasks, self.me, self.my_pos);
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}
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}
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}
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fn taskgroup_key(+_group: @taskgroup) { } // For TLS
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fn enlist_in_taskgroup(group_arc: taskgroup_arc,
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me: *rust_task) -> option<uint> {
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do group_arc.with |_c, state| {
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// If 'none', the group was failing. Can't enlist.
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do state.map |tasks| {
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// Try to find an empty slot.
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alt tasks.position(|x| x == none) {
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some(empty_index) {
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tasks.set_elt(empty_index, some(me));
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empty_index
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}
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none {
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tasks.push(some(me));
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tasks.len() - 1
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}
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}
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}
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}
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}
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// NB: Runs in destructor/post-exit context. Can't 'fail'.
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fn leave_taskgroup(group_arc: taskgroup_arc, me: *rust_task, index: uint) {
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do group_arc.with |_c, state| {
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// If 'none', already failing and we've already gotten a kill signal.
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do state.map |tasks| {
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assert tasks[index] == some(me);
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tasks.set_elt(index, none);
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};
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};
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}
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// NB: Runs in destructor/post-exit context. Can't 'fail'.
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fn kill_taskgroup(group_arc: taskgroup_arc, me: *rust_task, index: uint) {
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// NB: We could do the killing iteration outside of the group arc, by
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// having "let mut newstate" here, swapping inside, and iterating after.
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// But that would let other exiting tasks fall-through and exit while we
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// were trying to kill them, causing potential use-after-free. A task's
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// presence in the arc guarantees it's alive only while we hold the lock,
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// so if we're failing, all concurrently exiting tasks must wait for us.
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// To do it differently, we'd have to use the runtime's task refcounting.
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do group_arc.with |_c, state| {
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let mut newstate = none;
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*state <-> newstate;
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// Might already be none, if somebody is failing simultaneously.
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// That's ok; only one task needs to do the dirty work. (Might also
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// see 'none' if somebody already failed and we got a kill signal.)
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do newstate.map |tasks| {
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// First remove ourself (killing ourself won't do much good). This
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// is duplicated here to avoid having to lock twice.
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assert tasks[index] == some(me);
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tasks.set_elt(index, none);
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// Now send takedown signal.
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for tasks.each |entry| {
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do entry.map |task| {
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rustrt::rust_task_kill_other(task);
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};
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}
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};
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};
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}
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fn share_parent_taskgroup() -> taskgroup_arc {
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let me = rustrt::rust_get_task();
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alt unsafe { local_get(me, taskgroup_key) } {
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some(group) {
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group.tasks.clone()
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}
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none {
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/* Main task, doing first spawn ever. */
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let tasks = arc::exclusive(some(dvec::from_elem(some(me))));
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let group = @taskgroup(tasks.clone(), me, 0);
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unsafe { local_set(me, taskgroup_key, group); }
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tasks
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}
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}
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}
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fn spawn_raw(opts: task_opts, +f: fn~()) {
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// Decide whether the child needs to be in a new linked failure group.
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let child_tg: taskgroup_arc = if opts.supervise {
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share_parent_taskgroup()
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} else {
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arc::exclusive(some(dvec::from_elem(none)))
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};
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unsafe {
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let fptr = ptr::addr_of(f);
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let closure: *rust_closure = unsafe::reinterpret_cast(fptr);
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let child_data_ptr = ~mut some((child_tg, f));
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// Being killed with the unsafe task/closure pointers would leak them.
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do unkillable {
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// Agh. Get move-mode items into the closure. FIXME (#2829)
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let mut child_data = none;
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*child_data_ptr <-> child_data;
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let (child_tg, f) = option::unwrap(child_data);
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// Create child task.
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let new_task = alt opts.sched {
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none { rustrt::new_task() }
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some(sched_opts) { new_task_in_new_sched(sched_opts) }
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};
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assert !new_task.is_null();
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// Getting killed after here would leak the task.
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let new_task = alt opts.sched {
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none {
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rustrt::new_task()
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}
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some(sched_opts) {
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new_task_in_new_sched(sched_opts)
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}
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};
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assert !new_task.is_null();
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let child_wrapper =
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make_child_wrapper(new_task, child_tg, opts.supervise, f);
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let fptr = ptr::addr_of(child_wrapper);
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let closure: *rust_closure = unsafe::reinterpret_cast(fptr);
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do option::iter(opts.notify_chan) |c| {
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// FIXME (#1087): Would like to do notification in Rust
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rustrt::rust_task_config_notify(new_task, c);
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do option::iter(opts.notify_chan) |c| {
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// FIXME (#1087): Would like to do notification in Rust
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rustrt::rust_task_config_notify(new_task, c);
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}
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// Getting killed between these two calls would free the child's
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// closure. (Reordering them wouldn't help - then getting killed
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// between them would leak.)
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rustrt::start_task(new_task, closure);
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unsafe::forget(child_wrapper);
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}
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}
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rustrt::start_task(new_task, closure);
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unsafe::forget(f);
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fn make_child_wrapper(child_task: *rust_task, -child_tg: taskgroup_arc,
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supervise: bool, -f: fn~()) -> fn~() {
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let child_tg_ptr = ~mut some(child_tg);
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fn~() {
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// Agh. Get move-mode items into the closure. FIXME (#2829)
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let mut child_tg_opt = none;
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*child_tg_ptr <-> child_tg_opt;
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let child_tg = option::unwrap(child_tg_opt);
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// Child task runs this code.
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if !supervise {
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// FIXME (#1868, #1789) take this out later
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rustrt::unsupervise();
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}
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// Set up membership in taskgroup. If this returns none, the
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// parent was already failing, so don't bother doing anything.
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alt enlist_in_taskgroup(child_tg, child_task) {
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some(my_index) {
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let group = @taskgroup(child_tg, child_task, my_index);
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unsafe { local_set(child_task, taskgroup_key, group); }
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// Run the child's body.
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f();
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// Report successful exit. (TLS cleanup code will tear
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// down the group.)
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group.failed = false;
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}
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none { }
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}
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}
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}
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fn new_task_in_new_sched(opts: sched_opts) -> *rust_task {
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@ -640,7 +788,6 @@ fn spawn_raw(opts: task_opts, +f: fn~()) {
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};
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rustrt::rust_new_task_in_sched(sched_id)
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}
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}
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/****************************************************************************
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@ -760,7 +907,7 @@ unsafe fn local_get<T>(task: *rust_task,
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local_get_helper(task, key, false)
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}
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unsafe fn local_set<T>(task: *rust_task, key: local_data_key<T>, -data: @T) {
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unsafe fn local_set<T>(task: *rust_task, key: local_data_key<T>, +data: @T) {
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let map = get_task_local_map(task);
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// Store key+data as *voids. Data is invisibly referenced once; key isn't.
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let keyval = key_to_key_value(key);
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@ -822,7 +969,7 @@ unsafe fn local_data_get<T>(key: local_data_key<T>) -> option<@T> {
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* Store a value in task-local data. If this key already has a value,
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* that value is overwritten (and its destructor is run).
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*/
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unsafe fn local_data_set<T>(key: local_data_key<T>, -data: @T) {
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unsafe fn local_data_set<T>(key: local_data_key<T>, +data: @T) {
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local_set(rustrt::rust_get_task(), key, data)
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}
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/**
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@ -853,11 +1000,12 @@ extern mod rustrt {
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fn start_task(task: *rust_task, closure: *rust_closure);
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fn rust_task_is_unwinding(rt: *rust_task) -> bool;
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fn rust_task_is_unwinding(task: *rust_task) -> bool;
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fn unsupervise();
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fn rust_osmain_sched_id() -> sched_id;
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fn rust_task_inhibit_kill();
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fn rust_task_allow_kill();
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fn rust_task_kill_other(task: *rust_task);
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#[rust_stack]
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fn rust_get_task_local_data(task: *rust_task) -> *libc::c_void;
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@ -1232,7 +1380,7 @@ fn test_unkillable() {
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let ch = po.chan();
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// We want to do this after failing
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do spawn {
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do spawn_raw({ supervise: false with default_task_opts() }) {
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for iter::repeat(10u) { yield() }
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ch.send(());
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}
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@ -1269,7 +1417,7 @@ fn test_unkillable_nested() {
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let ch = po.chan();
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// We want to do this after failing
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do spawn {
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do spawn_raw({ supervise: false with default_task_opts() }) {
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for iter::repeat(10u) { yield() }
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ch.send(());
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}
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@ -10,6 +10,8 @@
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#include "rust_env.h"
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#include "rust_port.h"
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// TODO(bblum): get rid of supervisors
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// Tasks
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rust_task::rust_task(rust_sched_loop *sched_loop, rust_task_state state,
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rust_task *spawner, const char *name,
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@ -146,13 +148,9 @@ cleanup_task(cleanup_args *args) {
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task->notify(!threw_exception);
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if (threw_exception) {
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#ifndef __WIN32__
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task->conclude_failure();
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#else
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assert(false && "Shouldn't happen");
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#ifdef __WIN32__
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assert(!threw_exception && "No exception-handling yet on windows builds");
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#endif
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}
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}
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extern "C" CDECL void upcall_exchange_free(void *ptr);
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@ -262,10 +260,7 @@ void
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rust_task::kill() {
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scoped_lock with(kill_lock);
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if (dead()) {
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// Task is already dead, can't kill what's already dead.
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fail_parent();
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}
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// XXX: bblum: kill/kill race
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// Note the distinction here: kill() is when you're in an upcall
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// from task A and want to force-fail task B, you do B->kill().
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@ -314,31 +309,11 @@ rust_task::begin_failure(char const *expr, char const *file, size_t line) {
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throw this;
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#else
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die();
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conclude_failure();
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// FIXME (#908): Need unwinding on windows. This will end up aborting
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sched_loop->fail();
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#endif
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}
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void
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rust_task::conclude_failure() {
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fail_parent();
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}
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void
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rust_task::fail_parent() {
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scoped_lock with(supervisor_lock);
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if (supervisor) {
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DLOG(sched_loop, task,
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"task %s @0x%" PRIxPTR
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" propagating failure to supervisor %s @0x%" PRIxPTR,
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name, this, supervisor->name, supervisor);
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supervisor->kill();
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}
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if (NULL == supervisor && propagate_failure)
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sched_loop->fail();
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}
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void
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rust_task::unsupervise()
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{
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@ -275,8 +275,6 @@ public:
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// Fail self, assuming caller-on-stack is this task.
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void fail();
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void fail(char const *expr, char const *file, size_t line);
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void conclude_failure();
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void fail_parent();
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// Disconnect from our supervisor.
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void unsupervise();
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