1 // Copyright 2018 The Rust Project Developers. See the COPYRIGHT
2 // file at the top-level directory of this distribution and at
3 // http://rust-lang.org/COPYRIGHT.
5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
8 // option. This file may not be copied, modified, or distributed
9 // except according to those terms.
14 mode: UnsafeCell<isize>,
17 unsafe impl Send for RWLock {}
18 unsafe impl Sync for RWLock {} // FIXME
21 pub const fn new() -> RWLock {
23 mode: UnsafeCell::new(0),
28 pub unsafe fn read(&self) {
29 let mode = self.mode.get();
33 rtabort!("rwlock locked for writing");
38 pub unsafe fn try_read(&self) -> bool {
39 let mode = self.mode.get();
49 pub unsafe fn write(&self) {
50 let mode = self.mode.get();
54 rtabort!("rwlock locked for reading")
59 pub unsafe fn try_write(&self) -> bool {
60 let mode = self.mode.get();
70 pub unsafe fn read_unlock(&self) {
71 *self.mode.get() -= 1;
75 pub unsafe fn write_unlock(&self) {
76 *self.mode.get() += 1;
80 pub unsafe fn destroy(&self) {