bjoernager/rust
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Add thread Builder::no_hooks().

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This commit is contained in:
Mara Bos 2024-10-24 11:19:02 +02:00
parent 947354fbec
commit f2bf9e198e
2 changed files with 24 additions and 7 deletions
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22
library/std/src/thread/mod.rs
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@ -264,6 +264,8 @@ pub struct Builder {
name: Option<String>,
// The size of the stack for the spawned thread in bytes
stack_size: Option<usize>,
// Skip running and inheriting the thread spawn hooks
no_hooks: bool,
}
impl Builder {
@ -287,7 +289,7 @@ impl Builder {
/// ```
#[stable(feature = "rust1", since = "1.0.0")]
pub fn new() -> Builder {
Builder { name: None, stack_size: None }
Builder { name: None, stack_size: None, no_hooks: false }
}
/// Names the thread-to-be. Currently the name is used for identification
@ -343,6 +345,16 @@ impl Builder {
self
}
/// Disables running and inheriting [spawn hooks](add_spawn_hook).
///
/// Use this if the parent thread is in no way relevant for the child thread.
/// For example, when lazily spawning threads for a thread pool.
#[unstable(feature = "thread_spawn_hook", issue = "none")]
pub fn no_hooks(mut self) -> Builder {
self.no_hooks = true;
self
}
/// Spawns a new thread by taking ownership of the `Builder`, and returns an
/// [`io::Result`] to its [`JoinHandle`].
///
@ -465,7 +477,7 @@ impl Builder {
F: Send,
T: Send,
{
let Builder { name, stack_size } = self;
let Builder { name, stack_size, no_hooks } = self;
let stack_size = stack_size.unwrap_or_else(|| {
static MIN: AtomicUsize = AtomicUsize::new(0);
@ -491,7 +503,11 @@ impl Builder {
None => Thread::new_unnamed(id),
};
let hooks = spawnhook::run_spawn_hooks(&my_thread);
let hooks = if no_hooks {
spawnhook::ChildSpawnHooks::default()
} else {
spawnhook::run_spawn_hooks(&my_thread)
};
let their_thread = my_thread.clone();