Adding upstream version 1.65.0+dfsg1.upstream/1.65.0+dfsg1

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 113 insertions, 0 deletions

diff --git a/library/std/src/sys/unix/thread_parker/netbsd.rs b/library/std/src/sys/unix/thread_parker/netbsd.rs
new file mode 100644
index 000000000..7657605b5
--- /dev/null
+++ b/library/std/src/sys/unix/thread_parker/netbsd.rs
@@ -0,0 +1,113 @@
+use crate::ffi::{c_int, c_void};
+use crate::pin::Pin;
+use crate::ptr::{null, null_mut};
+use crate::sync::atomic::{
+    AtomicU64,
+    Ordering::{Acquire, Relaxed, Release},
+};
+use crate::time::Duration;
+use libc::{_lwp_self, clockid_t, lwpid_t, time_t, timespec, CLOCK_MONOTONIC};
+
+extern "C" {
+    fn ___lwp_park60(
+        clock_id: clockid_t,
+        flags: c_int,
+        ts: *mut timespec,
+        unpark: lwpid_t,
+        hint: *const c_void,
+        unparkhint: *const c_void,
+    ) -> c_int;
+    fn _lwp_unpark(lwp: lwpid_t, hint: *const c_void) -> c_int;
+}
+
+/// The thread is not parked and the token is not available.
+///
+/// Zero cannot be a valid LWP id, since it is used as empty value for the unpark
+/// argument in _lwp_park.
+const EMPTY: u64 = 0;
+/// The token is available. Do not park anymore.
+const NOTIFIED: u64 = u64::MAX;
+
+pub struct Parker {
+    /// The parker state. Contains either one of the two state values above or the LWP
+    /// id of the parked thread.
+    state: AtomicU64,
+}
+
+impl Parker {
+    pub unsafe fn new(parker: *mut Parker) {
+        parker.write(Parker { state: AtomicU64::new(EMPTY) })
+    }
+
+    // Does not actually need `unsafe` or `Pin`, but the pthread implementation does.
+    pub unsafe fn park(self: Pin<&Self>) {
+        // If the token has already been made available, we can skip
+        // a bit of work, so check for it here.
+        if self.state.load(Acquire) != NOTIFIED {
+            let parked = _lwp_self() as u64;
+            let hint = self.state.as_mut_ptr().cast();
+            if self.state.compare_exchange(EMPTY, parked, Relaxed, Acquire).is_ok() {
+                // Loop to guard against spurious wakeups.
+                loop {
+                    ___lwp_park60(0, 0, null_mut(), 0, hint, null());
+                    if self.state.load(Acquire) == NOTIFIED {
+                        break;
+                    }
+                }
+            }
+        }
+
+        // At this point, the change to NOTIFIED has always been observed with acquire
+        // ordering, so we can just use a relaxed store here (instead of a swap).
+        self.state.store(EMPTY, Relaxed);
+    }
+
+    // Does not actually need `unsafe` or `Pin`, but the pthread implementation does.
+    pub unsafe fn park_timeout(self: Pin<&Self>, dur: Duration) {
+        if self.state.load(Acquire) != NOTIFIED {
+            let parked = _lwp_self() as u64;
+            let hint = self.state.as_mut_ptr().cast();
+            let mut timeout = timespec {
+                // Saturate so that the operation will definitely time out
+                // (even if it is after the heat death of the universe).
+                tv_sec: dur.as_secs().try_into().ok().unwrap_or(time_t::MAX),
+                tv_nsec: dur.subsec_nanos().into(),
+            };
+
+            if self.state.compare_exchange(EMPTY, parked, Relaxed, Acquire).is_ok() {
+                // Timeout needs to be mutable since it is modified on NetBSD 9.0 and
+                // above.
+                ___lwp_park60(CLOCK_MONOTONIC, 0, &mut timeout, 0, hint, null());
+                // Use a swap to get acquire ordering even if the token was set after
+                // the timeout occurred.
+                self.state.swap(EMPTY, Acquire);
+                return;
+            }
+        }
+
+        self.state.store(EMPTY, Relaxed);
+    }
+
+    // Does not actually need `Pin`, but the pthread implementation does.
+    pub fn unpark(self: Pin<&Self>) {
+        let state = self.state.swap(NOTIFIED, Release);
+        if !matches!(state, EMPTY | NOTIFIED) {
+            let lwp = state as lwpid_t;
+            let hint = self.state.as_mut_ptr().cast();
+
+            // If the parking thread terminated and did not actually park, this will
+            // probably return an error, which is OK. In the worst case, another
+            // thread has received the same LWP id. It will then receive a spurious
+            // wakeup, but those are allowable per the API contract. The same reasoning
+            // applies if a timeout occurred before this call, but the state was not
+            // yet reset.
+
+            // SAFETY:
+            // The syscall has no invariants to hold. Only unsafe because it is an
+            // extern function.
+            unsafe {
+                _lwp_unpark(lwp, hint);
+            }
+        }
+    }
+}