Struct AccessMode

pub struct AccessMode(/* private fields */);

This enum is used by the constructor and setKey(). Its purpose is to enable handling the problem in Unix implementations of semaphores that survive a crash. In Unix, when a semaphore survives a crash, we need a way to force it to reset its resource count, when the system reuses the semaphore. In Windows, where semaphores can't survive a crash, this enum has no effect.

C++ enum: QSystemSemaphore::AccessMode.

C++ documentation:

This enum is used by the constructor and setKey(). Its purpose is to enable handling the problem in Unix implementations of semaphores that survive a crash. In Unix, when a semaphore survives a crash, we need a way to force it to reset its resource count, when the system reuses the semaphore. In Windows, where semaphores can’t survive a crash, this enum has no effect.

Implementations

impl AccessMode

pub fn to_int(&self) -> c_int

impl AccessMode

pub const Open: AccessMode

If the semaphore already exists, its initial resource count is not reset. If the semaphore does not already exist, it is created and its initial resource count set. (C++ enum variant: Open = 0)

pub const Create: AccessMode

QSystemSemaphore takes ownership of the semaphore and sets its resource count to the requested value, regardless of whether the semaphore already exists by having survived a crash. This value should be passed to the constructor, when the first semaphore for a particular key is constructed and you know that if the semaphore already exists it could only be because of a crash. In Windows, where a semaphore can’t survive a crash, Create and Open have the same behavior. (C++ enum variant: Create = 1)

Trait Implementations

impl Clone for AccessMode

fn clone(&self) -> AccessMode

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for AccessMode

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl From<AccessMode> for c_int

fn from(value: AccessMode) -> Self

Converts to this type from the input type.

impl From<i32> for AccessMode

fn from(value: c_int) -> Self

Converts to this type from the input type.

impl PartialEq for AccessMode

fn eq(&self, other: &AccessMode) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Copy for AccessMode

impl Eq for AccessMode

impl StructuralPartialEq for AccessMode