Run TLS destructors for wasm32-wasip1-threads
The target has support for pthreads and allows registration of TLS destructors.
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2 changed files with 74 additions and 0 deletions
71
library/std/src/sys/thread_local/guard/wasi.rs
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71
library/std/src/sys/thread_local/guard/wasi.rs
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@ -0,0 +1,71 @@
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//! wasm32-wasip1 has pthreads support.
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use crate::cell::Cell;
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use crate::sync::atomic::{AtomicBool, Ordering};
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use crate::sys::thread_local::destructors;
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use crate::{ffi, ptr};
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// Add a few symbols not in upstream `libc` just yet.
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mod libc {
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pub use libc::*;
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use crate::ffi;
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#[allow(non_camel_case_types)]
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pub type pthread_key_t = ffi::c_uint;
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extern "C" {
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pub fn pthread_key_create(
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key: *mut pthread_key_t,
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destructor: unsafe extern "C" fn(*mut ffi::c_void),
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) -> ffi::c_int;
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pub fn pthread_setspecific(key: pthread_key_t, value: *const ffi::c_void) -> ffi::c_int;
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}
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}
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pub fn enable() {
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enable_main();
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enable_thread();
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}
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fn enable_main() {
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static REGISTERED: AtomicBool = AtomicBool::new(false);
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if !REGISTERED.swap(true, Ordering::AcqRel) {
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unsafe {
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assert_eq!(libc::atexit(run_main_dtors), 0);
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}
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}
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extern "C" fn run_main_dtors() {
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unsafe {
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destructors::run();
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crate::rt::thread_cleanup();
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}
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}
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}
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fn enable_thread() {
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#[thread_local]
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static REGISTERED: Cell<bool> = Cell::new(false);
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if !REGISTERED.replace(true) {
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unsafe {
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let mut key: libc::pthread_key_t = 0;
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assert_eq!(libc::pthread_key_create(&mut key, run_thread_dtors), 0);
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// We must set the value to a non-NULL pointer value so that
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// the destructor is run on thread exit. The pointer is only
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// passed to run_dtors and never dereferenced.
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assert_eq!(libc::pthread_setspecific(key, ptr::without_provenance(1)), 0);
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}
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}
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extern "C" fn run_thread_dtors(_: *mut ffi::c_void) {
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unsafe {
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destructors::run();
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crate::rt::thread_cleanup();
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}
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}
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}
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@ -85,6 +85,9 @@ pub(crate) mod guard {
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} else if #[cfg(target_os = "windows")] {
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mod windows;
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pub(crate) use windows::enable;
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} else if #[cfg(all(target_os = "wasi"))] {
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mod wasi;
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pub(crate) use wasi::enable;
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} else if #[cfg(any(
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target_family = "wasm",
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target_os = "uefi",
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