1 files changed, 0 insertions, 153 deletions
diff --git a/library/std/src/sys/cloudabi/mutex.rs b/library/std/src/sys/cloudabi/mutex.rs
deleted file mode 100644
index 9dafcbc1fba..00000000000
--- a/library/std/src/sys/cloudabi/mutex.rs
+++ /dev/null
@@ -1,153 +0,0 @@
-use crate::cell::Cell;
-use crate::mem;
-use crate::mem::MaybeUninit;
-use crate::sync::atomic::{AtomicU32, Ordering};
-use crate::sys::cloudabi::abi;
-use crate::sys::rwlock::{self, RWLock};
-
-extern "C" {
-    #[thread_local]
-    static __pthread_thread_id: abi::tid;
-}
-
-// Implement Mutex using an RWLock. This doesn't introduce any
-// performance overhead in this environment, as the operations would be
-// implemented identically.
-pub struct Mutex(RWLock);
-
-pub type MovableMutex = Mutex;
-
-pub unsafe fn raw(m: &Mutex) -> &AtomicU32 {
-    rwlock::raw(&m.0)
-}
-
-impl Mutex {
-    pub const fn new() -> Mutex {
-        Mutex(RWLock::new())
-    }
-
-    pub unsafe fn init(&mut self) {
-        // This function should normally reinitialize the mutex after
-        // moving it to a different memory address. This implementation
-        // does not require adjustments after moving.
-    }
-
-    pub unsafe fn try_lock(&self) -> bool {
-        self.0.try_write()
-    }
-
-    pub unsafe fn lock(&self) {
-        self.0.write()
-    }
-
-    pub unsafe fn unlock(&self) {
-        self.0.write_unlock()
-    }
-
-    pub unsafe fn destroy(&self) {
-        self.0.destroy()
-    }
-}
-
-pub struct ReentrantMutex {
-    lock: AtomicU32,
-    recursion: Cell<u32>,
-}
-
-unsafe impl Send for ReentrantMutex {}
-unsafe impl Sync for ReentrantMutex {}
-
-impl ReentrantMutex {
-    pub const unsafe fn uninitialized() -> ReentrantMutex {
-        ReentrantMutex { lock: AtomicU32::new(abi::LOCK_UNLOCKED.0), recursion: Cell::new(0) }
-    }
-
-    pub unsafe fn init(&self) {}
-
-    pub unsafe fn try_lock(&self) -> bool {
-        // Attempt to acquire the lock.
-        if let Err(old) = self.lock.compare_exchange(
-            abi::LOCK_UNLOCKED.0,
-            __pthread_thread_id.0 | abi::LOCK_WRLOCKED.0,
-            Ordering::Acquire,
-            Ordering::Relaxed,
-        ) {
-            // If we fail to acquire the lock, it may be the case
-            // that we've already acquired it and may need to recurse.
-            if old & !abi::LOCK_KERNEL_MANAGED.0 == __pthread_thread_id.0 | abi::LOCK_WRLOCKED.0 {
-                self.recursion.set(self.recursion.get() + 1);
-                true
-            } else {
-                false
-            }
-        } else {
-            // Success.
-            assert_eq!(self.recursion.get(), 0, "Mutex has invalid recursion count");
-            true
-        }
-    }
-
-    pub unsafe fn lock(&self) {
-        if !self.try_lock() {
-            // Call into the kernel to acquire a write lock.
-            let lock = &self.lock as *const AtomicU32;
-            let subscription = abi::subscription {
-                type_: abi::eventtype::LOCK_WRLOCK,
-                union: abi::subscription_union {
-                    lock: abi::subscription_lock {
-                        lock: lock as *mut abi::lock,
-                        lock_scope: abi::scope::PRIVATE,
-                    },
-                },
-                ..mem::zeroed()
-            };
-            let mut event = MaybeUninit::<abi::event>::uninit();
-            let mut nevents = MaybeUninit::<usize>::uninit();
-            // SAFE: The caller must to ensure that `event` and `nevents` are initialized.
-            let ret =
-                unsafe { abi::poll(&subscription, event.as_mut_ptr(), 1, nevents.as_mut_ptr()) };
-            assert_eq!(ret, abi::errno::SUCCESS, "Failed to acquire mutex");
-            let event = event.assume_init();
-            assert_eq!(event.error, abi::errno::SUCCESS, "Failed to acquire mutex");
-        }
-    }
-
-    pub unsafe fn unlock(&self) {
-        assert_eq!(
-            self.lock.load(Ordering::Relaxed) & !abi::LOCK_KERNEL_MANAGED.0,
-            __pthread_thread_id.0 | abi::LOCK_WRLOCKED.0,
-            "This mutex is locked by a different thread"
-        );
-
-        let r = self.recursion.get();
-        if r > 0 {
-            self.recursion.set(r - 1);
-        } else if !self
-            .lock
-            .compare_exchange(
-                __pthread_thread_id.0 | abi::LOCK_WRLOCKED.0,
-                abi::LOCK_UNLOCKED.0,
-                Ordering::Release,
-                Ordering::Relaxed,
-            )
-            .is_ok()
-        {
-            // Lock is managed by kernelspace. Call into the kernel
-            // to unblock waiting threads.
-            let ret = abi::lock_unlock(
-                &self.lock as *const AtomicU32 as *mut abi::lock,
-                abi::scope::PRIVATE,
-            );
-            assert_eq!(ret, abi::errno::SUCCESS, "Failed to unlock a mutex");
-        }
-    }
-
-    pub unsafe fn destroy(&self) {
-        assert_eq!(
-            self.lock.load(Ordering::Relaxed),
-            abi::LOCK_UNLOCKED.0,
-            "Attempted to destroy locked mutex"
-        );
-        assert_eq!(self.recursion.get(), 0, "Recursion counter invalid");
-    }
-}