      1
      2
      3
      4
      5
      6
      7
      8
      9
     10
     11
     12
     13
     14
     15
     16
     17
     18
     19
     20
     21
     22
     23
     24
     25
     26
     27
     28
     29
     30
     31
     32
     33
     34
     35
     36
     37
     38
     39
     40
     41
     42
     43
     44
     45
     46
     47
     48
     49
     50
     51
     52
     53
     54
     55
     56
     57
     58
     59
     60
     61
     62
     63
     64
     65
     66
     67
     68
     69
     70
     71
     72
     73
     74
     75
     76
     77
     78
     79
     80
     81
     82
     83
     84
     85
     86
     87
     88
     89
     90
     91
     92
     93
     94
     95
     96
     97
     98
     99
    100
    101
    102
    103
    104
    105
    106
    107

    // 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 libc;
    use mem;

    pub struct Mutex { inner: UnsafeCell<libc::pthread_mutex_t> }

    #[inline]
    pub unsafe fn raw(m: &Mutex) -> *mut libc::pthread_mutex_t {
        m.inner.get()
    }

    unsafe impl Send for Mutex {}
    unsafe impl Sync for Mutex {}

    #[allow(dead_code)] // sys isn't exported yet
    impl Mutex {
        pub const fn new() -> Mutex {
            // Might be moved and address is changing it is better to avoid
            // initialization of potentially opaque OS data before it landed
            Mutex { inner: UnsafeCell::new(libc::PTHREAD_MUTEX_INITIALIZER) }
        }
        #[inline]
        pub unsafe fn lock(&self) {
            let r = libc::pthread_mutex_lock(self.inner.get());
            debug_assert_eq!(r, 0);
        }
        #[inline]
        pub unsafe fn unlock(&self) {
            let r = libc::pthread_mutex_unlock(self.inner.get());
            debug_assert_eq!(r, 0);
        }
        #[inline]
        pub unsafe fn try_lock(&self) -> bool {
            libc::pthread_mutex_trylock(self.inner.get()) == 0
        }
        #[inline]
        #[cfg(not(target_os = "dragonfly"))]
        pub unsafe fn destroy(&self) {
            let r = libc::pthread_mutex_destroy(self.inner.get());
            debug_assert_eq!(r, 0);
        }
        #[inline]
        #[cfg(target_os = "dragonfly")]
        pub unsafe fn destroy(&self) {
            use libc;
            let r = libc::pthread_mutex_destroy(self.inner.get());
            // On DragonFly pthread_mutex_destroy() returns EINVAL if called on a
            // mutex that was just initialized with libc::PTHREAD_MUTEX_INITIALIZER.
            // Once it is used (locked/unlocked) or pthread_mutex_init() is called,
            // this behaviour no longer occurs.
            debug_assert!(r == 0 || r == libc::EINVAL);
        }
    }

    pub struct ReentrantMutex { inner: UnsafeCell<libc::pthread_mutex_t> }

    unsafe impl Send for ReentrantMutex {}
    unsafe impl Sync for ReentrantMutex {}

    impl ReentrantMutex {
        pub unsafe fn uninitialized() -> ReentrantMutex {
            ReentrantMutex { inner: mem::uninitialized() }
        }

        pub unsafe fn init(&mut self) {
            let mut attr: libc::pthread_mutexattr_t = mem::uninitialized();
            let result = libc::pthread_mutexattr_init(&mut attr as *mut _);
            debug_assert_eq!(result, 0);
            let result = libc::pthread_mutexattr_settype(&mut attr as *mut _,
                                                        libc::PTHREAD_MUTEX_RECURSIVE);
            debug_assert_eq!(result, 0);
            let result = libc::pthread_mutex_init(self.inner.get(), &attr as *const _);
            debug_assert_eq!(result, 0);
            let result = libc::pthread_mutexattr_destroy(&mut attr as *mut _);
            debug_assert_eq!(result, 0);
        }

        pub unsafe fn lock(&self) {
            let result = libc::pthread_mutex_lock(self.inner.get());
            debug_assert_eq!(result, 0);
        }

        #[inline]
        pub unsafe fn try_lock(&self) -> bool {
            libc::pthread_mutex_trylock(self.inner.get()) == 0
        }

        pub unsafe fn unlock(&self) {
            let result = libc::pthread_mutex_unlock(self.inner.get());
            debug_assert_eq!(result, 0);
        }

        pub unsafe fn destroy(&self) {
            let result = libc::pthread_mutex_destroy(self.inner.get());
            debug_assert_eq!(result, 0);
        }
    }

# Help

## Keyboard Shortcuts

?
  Show this help dialog
S
  Focus the search field
⇤
  Move up in search results
⇥
  Move down in search results
⏎
  Go to active search result

## Search Tricks

Prefix searches with a type followed by a colon (e.g. `fn:`) to restrict the search to a given type.

Accepted types are: `fn`, `mod`, `struct`, `enum`, `trait`, `type`, `macro`, and `const`.

Search functions by type signature (e.g. `vec -> usize` or `* -> vec`)