| // Copyright 2014 The Rust Project Developers. See the COPYRIGHT |
| // file at the top-level directory of this distribution and at |
| // http://rust-lang.org/COPYRIGHT. |
| // |
| // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or |
| // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license |
| // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your |
| // option. This file may not be copied, modified, or distributed |
| // except according to those terms. |
| |
| use cell::UnsafeCell; |
| use sys::c; |
| |
| pub struct RWLock { inner: UnsafeCell<c::SRWLOCK> } |
| |
| unsafe impl Send for RWLock {} |
| unsafe impl Sync for RWLock {} |
| |
| impl RWLock { |
| pub const fn new() -> RWLock { |
| RWLock { inner: UnsafeCell::new(c::SRWLOCK_INIT) } |
| } |
| #[inline] |
| pub unsafe fn read(&self) { |
| c::AcquireSRWLockShared(self.inner.get()) |
| } |
| #[inline] |
| pub unsafe fn try_read(&self) -> bool { |
| c::TryAcquireSRWLockShared(self.inner.get()) != 0 |
| } |
| #[inline] |
| pub unsafe fn write(&self) { |
| c::AcquireSRWLockExclusive(self.inner.get()) |
| } |
| #[inline] |
| pub unsafe fn try_write(&self) -> bool { |
| c::TryAcquireSRWLockExclusive(self.inner.get()) != 0 |
| } |
| #[inline] |
| pub unsafe fn read_unlock(&self) { |
| c::ReleaseSRWLockShared(self.inner.get()) |
| } |
| #[inline] |
| pub unsafe fn write_unlock(&self) { |
| c::ReleaseSRWLockExclusive(self.inner.get()) |
| } |
| |
| #[inline] |
| pub unsafe fn destroy(&self) { |
| // ... |
| } |
| } |