mv std libs to library/

1 files changed, 0 insertions, 184 deletions

diff --git a/src/libstd/sys/windows/mutex.rs b/src/libstd/sys/windows/mutex.rs
deleted file mode 100644
index 63dfc640908..00000000000
--- a/src/libstd/sys/windows/mutex.rs
+++ /dev/null
@@ -1,184 +0,0 @@
-//! System Mutexes
-//!
-//! The Windows implementation of mutexes is a little odd and it may not be
-//! immediately obvious what's going on. The primary oddness is that SRWLock is
-//! used instead of CriticalSection, and this is done because:
-//!
-//! 1. SRWLock is several times faster than CriticalSection according to
-//!    benchmarks performed on both Windows 8 and Windows 7.
-//!
-//! 2. CriticalSection allows recursive locking while SRWLock deadlocks. The
-//!    Unix implementation deadlocks so consistency is preferred. See #19962 for
-//!    more details.
-//!
-//! 3. While CriticalSection is fair and SRWLock is not, the current Rust policy
-//!    is that there are no guarantees of fairness.
-//!
-//! The downside of this approach, however, is that SRWLock is not available on
-//! Windows XP, so we continue to have a fallback implementation where
-//! CriticalSection is used and we keep track of who's holding the mutex to
-//! detect recursive locks.
-
-use crate::cell::UnsafeCell;
-use crate::mem::{self, MaybeUninit};
-use crate::sync::atomic::{AtomicUsize, Ordering};
-use crate::sys::c;
-use crate::sys::compat;
-
-pub struct Mutex {
-    lock: AtomicUsize,
-    held: UnsafeCell<bool>,
-}
-
-unsafe impl Send for Mutex {}
-unsafe impl Sync for Mutex {}
-
-#[derive(Clone, Copy)]
-enum Kind {
-    SRWLock = 1,
-    CriticalSection = 2,
-}
-
-#[inline]
-pub unsafe fn raw(m: &Mutex) -> c::PSRWLOCK {
-    debug_assert!(mem::size_of::<c::SRWLOCK>() <= mem::size_of_val(&m.lock));
-    &m.lock as *const _ as *mut _
-}
-
-impl Mutex {
-    pub const fn new() -> Mutex {
-        Mutex {
-            // This works because SRWLOCK_INIT is 0 (wrapped in a struct), so we are also properly
-            // initializing an SRWLOCK here.
-            lock: AtomicUsize::new(0),
-            held: UnsafeCell::new(false),
-        }
-    }
-    #[inline]
-    pub unsafe fn init(&mut self) {}
-    pub unsafe fn lock(&self) {
-        match kind() {
-            Kind::SRWLock => c::AcquireSRWLockExclusive(raw(self)),
-            Kind::CriticalSection => {
-                let re = self.remutex();
-                (*re).lock();
-                if !self.flag_locked() {
-                    (*re).unlock();
-                    panic!("cannot recursively lock a mutex");
-                }
-            }
-        }
-    }
-    pub unsafe fn try_lock(&self) -> bool {
-        match kind() {
-            Kind::SRWLock => c::TryAcquireSRWLockExclusive(raw(self)) != 0,
-            Kind::CriticalSection => {
-                let re = self.remutex();
-                if !(*re).try_lock() {
-                    false
-                } else if self.flag_locked() {
-                    true
-                } else {
-                    (*re).unlock();
-                    false
-                }
-            }
-        }
-    }
-    pub unsafe fn unlock(&self) {
-        *self.held.get() = false;
-        match kind() {
-            Kind::SRWLock => c::ReleaseSRWLockExclusive(raw(self)),
-            Kind::CriticalSection => (*self.remutex()).unlock(),
-        }
-    }
-    pub unsafe fn destroy(&self) {
-        match kind() {
-            Kind::SRWLock => {}
-            Kind::CriticalSection => match self.lock.load(Ordering::SeqCst) {
-                0 => {}
-                n => {
-                    Box::from_raw(n as *mut ReentrantMutex).destroy();
-                }
-            },
-        }
-    }
-
-    unsafe fn remutex(&self) -> *mut ReentrantMutex {
-        match self.lock.load(Ordering::SeqCst) {
-            0 => {}
-            n => return n as *mut _,
-        }
-        let re = box ReentrantMutex::uninitialized();
-        re.init();
-        let re = Box::into_raw(re);
-        match self.lock.compare_and_swap(0, re as usize, Ordering::SeqCst) {
-            0 => re,
-            n => {
-                Box::from_raw(re).destroy();
-                n as *mut _
-            }
-        }
-    }
-
-    unsafe fn flag_locked(&self) -> bool {
-        if *self.held.get() {
-            false
-        } else {
-            *self.held.get() = true;
-            true
-        }
-    }
-}
-
-fn kind() -> Kind {
-    static KIND: AtomicUsize = AtomicUsize::new(0);
-
-    let val = KIND.load(Ordering::SeqCst);
-    if val == Kind::SRWLock as usize {
-        return Kind::SRWLock;
-    } else if val == Kind::CriticalSection as usize {
-        return Kind::CriticalSection;
-    }
-
-    let ret = match compat::lookup("kernel32", "AcquireSRWLockExclusive") {
-        None => Kind::CriticalSection,
-        Some(..) => Kind::SRWLock,
-    };
-    KIND.store(ret as usize, Ordering::SeqCst);
-    ret
-}
-
-pub struct ReentrantMutex {
-    inner: UnsafeCell<MaybeUninit<c::CRITICAL_SECTION>>,
-}
-
-unsafe impl Send for ReentrantMutex {}
-unsafe impl Sync for ReentrantMutex {}
-
-impl ReentrantMutex {
-    pub const fn uninitialized() -> ReentrantMutex {
-        ReentrantMutex { inner: UnsafeCell::new(MaybeUninit::uninit()) }
-    }
-
-    pub unsafe fn init(&self) {
-        c::InitializeCriticalSection((&mut *self.inner.get()).as_mut_ptr());
-    }
-
-    pub unsafe fn lock(&self) {
-        c::EnterCriticalSection((&mut *self.inner.get()).as_mut_ptr());
-    }
-
-    #[inline]
-    pub unsafe fn try_lock(&self) -> bool {
-        c::TryEnterCriticalSection((&mut *self.inner.get()).as_mut_ptr()) != 0
-    }
-
-    pub unsafe fn unlock(&self) {
-        c::LeaveCriticalSection((&mut *self.inner.get()).as_mut_ptr());
-    }
-
-    pub unsafe fn destroy(&self) {
-        c::DeleteCriticalSection((&mut *self.inner.get()).as_mut_ptr());
-    }
-}