/
mutex.rs
713 lines (637 loc) · 22.9 KB
/
mutex.rs
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// Copyright 2013-2014 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.
//! A native mutex and condition variable type.
//!
//! This module contains bindings to the platform's native mutex/condition
//! variable primitives. It provides two types: `StaticNativeMutex`, which can
//! be statically initialized via the `NATIVE_MUTEX_INIT` value, and a simple
//! wrapper `NativeMutex` that has a destructor to clean up after itself. These
//! objects serve as both mutexes and condition variables simultaneously.
//!
//! The static lock is lazily initialized, but it can only be unsafely
//! destroyed. A statically initialized lock doesn't necessarily have a time at
//! which it can get deallocated. For this reason, there is no `Drop`
//! implementation of the static mutex, but rather the `destroy()` method must
//! be invoked manually if destruction of the mutex is desired.
//!
//! The non-static `NativeMutex` type does have a destructor, but cannot be
//! statically initialized.
//!
//! It is not recommended to use this type for idiomatic rust use. These types
//! are appropriate where no other options are available, but other rust
//! concurrency primitives should be used before them: the `sync` crate defines
//! `StaticMutex` and `Mutex` types.
//!
//! # Example
//!
//! ```rust
//! use std::rt::mutex::{NativeMutex, StaticNativeMutex, NATIVE_MUTEX_INIT};
//!
//! // Use a statically initialized mutex
//! static mut LOCK: StaticNativeMutex = NATIVE_MUTEX_INIT;
//!
//! unsafe {
//! let _guard = LOCK.lock();
//! } // automatically unlocked here
//!
//! // Use a normally initialized mutex
//! unsafe {
//! let mut lock = NativeMutex::new();
//!
//! {
//! let _guard = lock.lock();
//! } // unlocked here
//!
//! // sometimes the RAII guard isn't appropriate
//! lock.lock_noguard();
//! lock.unlock_noguard();
//! } // `lock` is deallocated here
//! ```
#![allow(non_camel_case_types)]
use core::prelude::*;
/// A native mutex suitable for storing in statics (that is, it has
/// the `destroy` method rather than a destructor).
///
/// Prefer the `NativeMutex` type where possible, since that does not
/// require manual deallocation.
pub struct StaticNativeMutex {
inner: imp::Mutex,
}
/// A native mutex with a destructor for clean-up.
///
/// See `StaticNativeMutex` for a version that is suitable for storing in
/// statics.
pub struct NativeMutex {
inner: StaticNativeMutex
}
/// Automatically unlocks the mutex that it was created from on
/// destruction.
///
/// Using this makes lock-based code resilient to unwinding/task
/// failure, because the lock will be automatically unlocked even
/// then.
#[must_use]
pub struct LockGuard<'a> {
lock: &'a StaticNativeMutex
}
pub const NATIVE_MUTEX_INIT: StaticNativeMutex = StaticNativeMutex {
inner: imp::MUTEX_INIT,
};
impl StaticNativeMutex {
/// Creates a new mutex.
///
/// Note that a mutex created in this way needs to be explicit
/// freed with a call to `destroy` or it will leak.
/// Also it is important to avoid locking until mutex has stopped moving
pub unsafe fn new() -> StaticNativeMutex {
StaticNativeMutex { inner: imp::Mutex::new() }
}
/// Acquires this lock. This assumes that the current thread does not
/// already hold the lock.
///
/// # Example
///
/// ```rust
/// use std::rt::mutex::{StaticNativeMutex, NATIVE_MUTEX_INIT};
/// static mut LOCK: StaticNativeMutex = NATIVE_MUTEX_INIT;
/// unsafe {
/// let _guard = LOCK.lock();
/// // critical section...
/// } // automatically unlocked in `_guard`'s destructor
/// ```
///
/// # Unsafety
///
/// This method is unsafe because it will not function correctly if this
/// mutex has been *moved* since it was last used. The mutex can move an
/// arbitrary number of times before its first usage, but once a mutex has
/// been used once it is no longer allowed to move (or otherwise it invokes
/// undefined behavior).
///
/// Additionally, this type does not take into account any form of
/// scheduling model. This will unconditionally block the *os thread* which
/// is not always desired.
pub unsafe fn lock<'a>(&'a self) -> LockGuard<'a> {
self.inner.lock();
LockGuard { lock: self }
}
/// Attempts to acquire the lock. The value returned is `Some` if
/// the attempt succeeded.
///
/// # Unsafety
///
/// This method is unsafe for the same reasons as `lock`.
pub unsafe fn trylock<'a>(&'a self) -> Option<LockGuard<'a>> {
if self.inner.trylock() {
Some(LockGuard { lock: self })
} else {
None
}
}
/// Acquire the lock without creating a `LockGuard`.
///
/// These needs to be paired with a call to `.unlock_noguard`. Prefer using
/// `.lock`.
///
/// # Unsafety
///
/// This method is unsafe for the same reasons as `lock`. Additionally, this
/// does not guarantee that the mutex will ever be unlocked, and it is
/// undefined to drop an already-locked mutex.
pub unsafe fn lock_noguard(&self) { self.inner.lock() }
/// Attempts to acquire the lock without creating a
/// `LockGuard`. The value returned is whether the lock was
/// acquired or not.
///
/// If `true` is returned, this needs to be paired with a call to
/// `.unlock_noguard`. Prefer using `.trylock`.
///
/// # Unsafety
///
/// This method is unsafe for the same reasons as `lock_noguard`.
pub unsafe fn trylock_noguard(&self) -> bool {
self.inner.trylock()
}
/// Unlocks the lock. This assumes that the current thread already holds the
/// lock.
///
/// # Unsafety
///
/// This method is unsafe for the same reasons as `lock`. Additionally, it
/// is not guaranteed that this is unlocking a previously locked mutex. It
/// is undefined to unlock an unlocked mutex.
pub unsafe fn unlock_noguard(&self) { self.inner.unlock() }
/// Block on the internal condition variable.
///
/// This function assumes that the lock is already held. Prefer
/// using `LockGuard.wait` since that guarantees that the lock is
/// held.
///
/// # Unsafety
///
/// This method is unsafe for the same reasons as `lock`. Additionally, this
/// is unsafe because the mutex may not be currently locked.
pub unsafe fn wait_noguard(&self) { self.inner.wait() }
/// Signals a thread in `wait` to wake up
///
/// # Unsafety
///
/// This method is unsafe for the same reasons as `lock`. Additionally, this
/// is unsafe because the mutex may not be currently locked.
pub unsafe fn signal_noguard(&self) { self.inner.signal() }
/// This function is especially unsafe because there are no guarantees made
/// that no other thread is currently holding the lock or waiting on the
/// condition variable contained inside.
pub unsafe fn destroy(&self) { self.inner.destroy() }
}
impl NativeMutex {
/// Creates a new mutex.
///
/// The user must be careful to ensure the mutex is not locked when its is
/// being destroyed.
/// Also it is important to avoid locking until mutex has stopped moving
pub unsafe fn new() -> NativeMutex {
NativeMutex { inner: StaticNativeMutex::new() }
}
/// Acquires this lock. This assumes that the current thread does not
/// already hold the lock.
///
/// # Example
///
/// ```rust
/// use std::rt::mutex::NativeMutex;
/// unsafe {
/// let mut lock = NativeMutex::new();
///
/// {
/// let _guard = lock.lock();
/// // critical section...
/// } // automatically unlocked in `_guard`'s destructor
/// }
/// ```
///
/// # Unsafety
///
/// This method is unsafe due to the same reasons as
/// `StaticNativeMutex::lock`.
pub unsafe fn lock<'a>(&'a self) -> LockGuard<'a> {
self.inner.lock()
}
/// Attempts to acquire the lock. The value returned is `Some` if
/// the attempt succeeded.
///
/// # Unsafety
///
/// This method is unsafe due to the same reasons as
/// `StaticNativeMutex::trylock`.
pub unsafe fn trylock<'a>(&'a self) -> Option<LockGuard<'a>> {
self.inner.trylock()
}
/// Acquire the lock without creating a `LockGuard`.
///
/// These needs to be paired with a call to `.unlock_noguard`. Prefer using
/// `.lock`.
///
/// # Unsafety
///
/// This method is unsafe due to the same reasons as
/// `StaticNativeMutex::lock_noguard`.
pub unsafe fn lock_noguard(&self) { self.inner.lock_noguard() }
/// Attempts to acquire the lock without creating a
/// `LockGuard`. The value returned is whether the lock was
/// acquired or not.
///
/// If `true` is returned, this needs to be paired with a call to
/// `.unlock_noguard`. Prefer using `.trylock`.
///
/// # Unsafety
///
/// This method is unsafe due to the same reasons as
/// `StaticNativeMutex::trylock_noguard`.
pub unsafe fn trylock_noguard(&self) -> bool {
self.inner.trylock_noguard()
}
/// Unlocks the lock. This assumes that the current thread already holds the
/// lock.
///
/// # Unsafety
///
/// This method is unsafe due to the same reasons as
/// `StaticNativeMutex::unlock_noguard`.
pub unsafe fn unlock_noguard(&self) { self.inner.unlock_noguard() }
/// Block on the internal condition variable.
///
/// This function assumes that the lock is already held. Prefer
/// using `LockGuard.wait` since that guarantees that the lock is
/// held.
///
/// # Unsafety
///
/// This method is unsafe due to the same reasons as
/// `StaticNativeMutex::wait_noguard`.
pub unsafe fn wait_noguard(&self) { self.inner.wait_noguard() }
/// Signals a thread in `wait` to wake up
///
/// # Unsafety
///
/// This method is unsafe due to the same reasons as
/// `StaticNativeMutex::signal_noguard`.
pub unsafe fn signal_noguard(&self) { self.inner.signal_noguard() }
}
impl Drop for NativeMutex {
fn drop(&mut self) {
unsafe {self.inner.destroy()}
}
}
impl<'a> LockGuard<'a> {
/// Block on the internal condition variable.
pub unsafe fn wait(&self) {
self.lock.wait_noguard()
}
/// Signals a thread in `wait` to wake up.
pub unsafe fn signal(&self) {
self.lock.signal_noguard()
}
}
#[unsafe_destructor]
impl<'a> Drop for LockGuard<'a> {
fn drop(&mut self) {
unsafe {self.lock.unlock_noguard()}
}
}
#[cfg(unix)]
mod imp {
use libc;
use self::os::{PTHREAD_MUTEX_INITIALIZER, PTHREAD_COND_INITIALIZER,
pthread_mutex_t, pthread_cond_t};
use core::cell::UnsafeCell;
type pthread_mutexattr_t = libc::c_void;
type pthread_condattr_t = libc::c_void;
#[cfg(any(target_os = "freebsd", target_os = "dragonfly"))]
mod os {
use libc;
pub type pthread_mutex_t = *mut libc::c_void;
pub type pthread_cond_t = *mut libc::c_void;
pub const PTHREAD_MUTEX_INITIALIZER: pthread_mutex_t =
0 as pthread_mutex_t;
pub const PTHREAD_COND_INITIALIZER: pthread_cond_t =
0 as pthread_cond_t;
}
#[cfg(any(target_os = "macos", target_os = "ios"))]
mod os {
use libc;
#[cfg(target_arch = "x86_64")]
static __PTHREAD_MUTEX_SIZE__: uint = 56;
#[cfg(target_arch = "x86_64")]
static __PTHREAD_COND_SIZE__: uint = 40;
#[cfg(target_arch = "x86")]
static __PTHREAD_MUTEX_SIZE__: uint = 40;
#[cfg(target_arch = "x86")]
static __PTHREAD_COND_SIZE__: uint = 24;
#[cfg(target_arch = "arm")]
static __PTHREAD_MUTEX_SIZE__: uint = 40;
#[cfg(target_arch = "arm")]
static __PTHREAD_COND_SIZE__: uint = 24;
static _PTHREAD_MUTEX_SIG_INIT: libc::c_long = 0x32AAABA7;
static _PTHREAD_COND_SIG_INIT: libc::c_long = 0x3CB0B1BB;
#[repr(C)]
pub struct pthread_mutex_t {
__sig: libc::c_long,
__opaque: [u8, ..__PTHREAD_MUTEX_SIZE__],
}
#[repr(C)]
pub struct pthread_cond_t {
__sig: libc::c_long,
__opaque: [u8, ..__PTHREAD_COND_SIZE__],
}
pub const PTHREAD_MUTEX_INITIALIZER: pthread_mutex_t = pthread_mutex_t {
__sig: _PTHREAD_MUTEX_SIG_INIT,
__opaque: [0, ..__PTHREAD_MUTEX_SIZE__],
};
pub const PTHREAD_COND_INITIALIZER: pthread_cond_t = pthread_cond_t {
__sig: _PTHREAD_COND_SIG_INIT,
__opaque: [0, ..__PTHREAD_COND_SIZE__],
};
}
#[cfg(target_os = "linux")]
mod os {
use libc;
// minus 8 because we have an 'align' field
#[cfg(target_arch = "x86_64")]
const __SIZEOF_PTHREAD_MUTEX_T: uint = 40 - 8;
#[cfg(target_arch = "x86")]
const __SIZEOF_PTHREAD_MUTEX_T: uint = 24 - 8;
#[cfg(target_arch = "arm")]
const __SIZEOF_PTHREAD_MUTEX_T: uint = 24 - 8;
#[cfg(target_arch = "mips")]
const __SIZEOF_PTHREAD_MUTEX_T: uint = 24 - 8;
#[cfg(target_arch = "mipsel")]
const __SIZEOF_PTHREAD_MUTEX_T: uint = 24 - 8;
#[cfg(target_arch = "x86_64")]
const __SIZEOF_PTHREAD_COND_T: uint = 48 - 8;
#[cfg(target_arch = "x86")]
const __SIZEOF_PTHREAD_COND_T: uint = 48 - 8;
#[cfg(target_arch = "arm")]
const __SIZEOF_PTHREAD_COND_T: uint = 48 - 8;
#[cfg(target_arch = "mips")]
const __SIZEOF_PTHREAD_COND_T: uint = 48 - 8;
#[cfg(target_arch = "mipsel")]
const __SIZEOF_PTHREAD_COND_T: uint = 48 - 8;
#[repr(C)]
pub struct pthread_mutex_t {
__align: libc::c_longlong,
size: [u8, ..__SIZEOF_PTHREAD_MUTEX_T],
}
#[repr(C)]
pub struct pthread_cond_t {
__align: libc::c_longlong,
size: [u8, ..__SIZEOF_PTHREAD_COND_T],
}
pub const PTHREAD_MUTEX_INITIALIZER: pthread_mutex_t = pthread_mutex_t {
__align: 0,
size: [0, ..__SIZEOF_PTHREAD_MUTEX_T],
};
pub const PTHREAD_COND_INITIALIZER: pthread_cond_t = pthread_cond_t {
__align: 0,
size: [0, ..__SIZEOF_PTHREAD_COND_T],
};
}
#[cfg(target_os = "android")]
mod os {
use libc;
#[repr(C)]
pub struct pthread_mutex_t { value: libc::c_int }
#[repr(C)]
pub struct pthread_cond_t { value: libc::c_int }
pub const PTHREAD_MUTEX_INITIALIZER: pthread_mutex_t = pthread_mutex_t {
value: 0,
};
pub const PTHREAD_COND_INITIALIZER: pthread_cond_t = pthread_cond_t {
value: 0,
};
}
pub struct Mutex {
lock: UnsafeCell<pthread_mutex_t>,
cond: UnsafeCell<pthread_cond_t>,
}
pub const MUTEX_INIT: Mutex = Mutex {
lock: UnsafeCell { value: PTHREAD_MUTEX_INITIALIZER },
cond: UnsafeCell { value: PTHREAD_COND_INITIALIZER },
};
impl Mutex {
pub unsafe fn new() -> Mutex {
// As mutex might be moved and address is changing it
// is better to avoid initialization of potentially
// opaque OS data before it landed
let m = Mutex {
lock: UnsafeCell::new(PTHREAD_MUTEX_INITIALIZER),
cond: UnsafeCell::new(PTHREAD_COND_INITIALIZER),
};
return m;
}
pub unsafe fn lock(&self) { pthread_mutex_lock(self.lock.get()); }
pub unsafe fn unlock(&self) { pthread_mutex_unlock(self.lock.get()); }
pub unsafe fn signal(&self) { pthread_cond_signal(self.cond.get()); }
pub unsafe fn wait(&self) {
pthread_cond_wait(self.cond.get(), self.lock.get());
}
pub unsafe fn trylock(&self) -> bool {
pthread_mutex_trylock(self.lock.get()) == 0
}
pub unsafe fn destroy(&self) {
pthread_mutex_destroy(self.lock.get());
pthread_cond_destroy(self.cond.get());
}
}
extern {
fn pthread_mutex_destroy(lock: *mut pthread_mutex_t) -> libc::c_int;
fn pthread_cond_destroy(cond: *mut pthread_cond_t) -> libc::c_int;
fn pthread_mutex_lock(lock: *mut pthread_mutex_t) -> libc::c_int;
fn pthread_mutex_trylock(lock: *mut pthread_mutex_t) -> libc::c_int;
fn pthread_mutex_unlock(lock: *mut pthread_mutex_t) -> libc::c_int;
fn pthread_cond_wait(cond: *mut pthread_cond_t,
lock: *mut pthread_mutex_t) -> libc::c_int;
fn pthread_cond_signal(cond: *mut pthread_cond_t) -> libc::c_int;
}
}
#[cfg(windows)]
mod imp {
use alloc::libc_heap::malloc_raw;
use core::atomic;
use core::ptr;
use libc::{HANDLE, BOOL, LPSECURITY_ATTRIBUTES, c_void, DWORD, LPCSTR};
use libc;
type LPCRITICAL_SECTION = *mut c_void;
const SPIN_COUNT: DWORD = 4000;
#[cfg(target_arch = "x86")]
const CRIT_SECTION_SIZE: uint = 24;
#[cfg(target_arch = "x86_64")]
const CRIT_SECTION_SIZE: uint = 40;
pub struct Mutex {
// pointers for the lock/cond handles, atomically updated
lock: atomic::AtomicUint,
cond: atomic::AtomicUint,
}
pub const MUTEX_INIT: Mutex = Mutex {
lock: atomic::INIT_ATOMIC_UINT,
cond: atomic::INIT_ATOMIC_UINT,
};
impl Mutex {
pub unsafe fn new() -> Mutex {
Mutex {
lock: atomic::AtomicUint::new(init_lock()),
cond: atomic::AtomicUint::new(init_cond()),
}
}
pub unsafe fn lock(&self) {
EnterCriticalSection(self.getlock() as LPCRITICAL_SECTION)
}
pub unsafe fn trylock(&self) -> bool {
TryEnterCriticalSection(self.getlock() as LPCRITICAL_SECTION) != 0
}
pub unsafe fn unlock(&self) {
LeaveCriticalSection(self.getlock() as LPCRITICAL_SECTION)
}
pub unsafe fn wait(&self) {
self.unlock();
WaitForSingleObject(self.getcond() as HANDLE, libc::INFINITE);
self.lock();
}
pub unsafe fn signal(&self) {
assert!(SetEvent(self.getcond() as HANDLE) != 0);
}
/// This function is especially unsafe because there are no guarantees made
/// that no other thread is currently holding the lock or waiting on the
/// condition variable contained inside.
pub unsafe fn destroy(&self) {
let lock = self.lock.swap(0, atomic::SeqCst);
let cond = self.cond.swap(0, atomic::SeqCst);
if lock != 0 { free_lock(lock) }
if cond != 0 { free_cond(cond) }
}
unsafe fn getlock(&self) -> *mut c_void {
match self.lock.load(atomic::SeqCst) {
0 => {}
n => return n as *mut c_void
}
let lock = init_lock();
match self.lock.compare_and_swap(0, lock, atomic::SeqCst) {
0 => return lock as *mut c_void,
_ => {}
}
free_lock(lock);
return self.lock.load(atomic::SeqCst) as *mut c_void;
}
unsafe fn getcond(&self) -> *mut c_void {
match self.cond.load(atomic::SeqCst) {
0 => {}
n => return n as *mut c_void
}
let cond = init_cond();
match self.cond.compare_and_swap(0, cond, atomic::SeqCst) {
0 => return cond as *mut c_void,
_ => {}
}
free_cond(cond);
return self.cond.load(atomic::SeqCst) as *mut c_void;
}
}
pub unsafe fn init_lock() -> uint {
let block = malloc_raw(CRIT_SECTION_SIZE as uint) as *mut c_void;
InitializeCriticalSectionAndSpinCount(block, SPIN_COUNT);
return block as uint;
}
pub unsafe fn init_cond() -> uint {
return CreateEventA(ptr::null_mut(), libc::FALSE, libc::FALSE,
ptr::null()) as uint;
}
pub unsafe fn free_lock(h: uint) {
DeleteCriticalSection(h as LPCRITICAL_SECTION);
libc::free(h as *mut c_void);
}
pub unsafe fn free_cond(h: uint) {
let block = h as HANDLE;
libc::CloseHandle(block);
}
#[allow(non_snake_case)]
extern "system" {
fn CreateEventA(lpSecurityAttributes: LPSECURITY_ATTRIBUTES,
bManualReset: BOOL,
bInitialState: BOOL,
lpName: LPCSTR) -> HANDLE;
fn InitializeCriticalSectionAndSpinCount(
lpCriticalSection: LPCRITICAL_SECTION,
dwSpinCount: DWORD) -> BOOL;
fn DeleteCriticalSection(lpCriticalSection: LPCRITICAL_SECTION);
fn EnterCriticalSection(lpCriticalSection: LPCRITICAL_SECTION);
fn LeaveCriticalSection(lpCriticalSection: LPCRITICAL_SECTION);
fn TryEnterCriticalSection(lpCriticalSection: LPCRITICAL_SECTION) -> BOOL;
fn SetEvent(hEvent: HANDLE) -> BOOL;
fn WaitForSingleObject(hHandle: HANDLE, dwMilliseconds: DWORD) -> DWORD;
}
}
#[cfg(test)]
mod test {
use std::prelude::*;
use std::mem::drop;
use super::{StaticNativeMutex, NATIVE_MUTEX_INIT};
use std::rt::thread::Thread;
#[test]
fn smoke_lock() {
static mut lock: StaticNativeMutex = NATIVE_MUTEX_INIT;
unsafe {
let _guard = lock.lock();
}
}
#[test]
fn smoke_cond() {
static mut lock: StaticNativeMutex = NATIVE_MUTEX_INIT;
unsafe {
let guard = lock.lock();
let t = Thread::start(proc() {
let guard = lock.lock();
guard.signal();
});
guard.wait();
drop(guard);
t.join();
}
}
#[test]
fn smoke_lock_noguard() {
static mut lock: StaticNativeMutex = NATIVE_MUTEX_INIT;
unsafe {
lock.lock_noguard();
lock.unlock_noguard();
}
}
#[test]
fn smoke_cond_noguard() {
static mut lock: StaticNativeMutex = NATIVE_MUTEX_INIT;
unsafe {
lock.lock_noguard();
let t = Thread::start(proc() {
lock.lock_noguard();
lock.signal_noguard();
lock.unlock_noguard();
});
lock.wait_noguard();
lock.unlock_noguard();
t.join();
}
}
#[test]
fn destroy_immediately() {
unsafe {
let m = StaticNativeMutex::new();
m.destroy();
}
}
}