Struct semka::Sem

pub struct Sem { /* private fields */ }

POSIX implementation of Semaphore

Implementations

impl Sem

pub const unsafe fn new_uninit() -> Self

Creates new uninit instance.

It is UB to use it until init is called.

pub fn init(&self, init: u32) -> bool

Initializes semaphore with provided init as initial value.

Returns true on success.

Returns false if semaphore is already initialized or initialization failed.

pub fn new(init: u32) -> Option<Self>

Creates new instance, initializing it with init

pub fn wait(&self)

Decrements self, returning immediately if it was signaled.

Otherwise awaits for signal.

pub fn try_wait(&self) -> bool

Attempts to decrement self, returning whether self was signaled or not.

Returns true if self was signaled.

Returns false otherwise.

pub fn wait_timeout(&self, duration: Duration) -> bool

Attempts to decrement self within provided time, returning whether self was signaled or not.

Returns true if self was signaled within specified timeout

Returns false otherwise

pub fn signal(&self)

Increments self, waking any awaiting thread as result.

pub unsafe fn close(&self)

Performs deinitialization.

Using Sem after close is undefined behaviour, unless init is called

Trait Implementations

impl Drop for Sem

fn drop(&mut self)

Executes the destructor for this type.

impl Send for Sem

impl Sync for Sem