Struct qt_core::q_system_semaphore::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

This method tests for self and other values to be equal, and is used by ==.

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

This method 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 StructuralEq for AccessMode

impl StructuralPartialEq for AccessMode