Struct mmal_sys::VCOS_EVENT_WAITER_T

#[repr(C)]
pub struct VCOS_EVENT_WAITER_T { /* fields omitted */ }

\file

This provides event flags (as per Nucleus Event Groups) based on a mutex, a semaphore (per waiting thread) and a timer (per waiting thread).

The data structure is a 32 bit unsigned int (the current set of flags) and a linked list of clients waiting to be 'satisfied'.

The mutex merely locks access to the data structure. If a client calls vcos_event_flags_get() and the requested bits are not already present, it then sleeps on its per-thread semaphore after adding this semaphore to the queue waiting. It also sets up a timer.

The per-thread semaphore and timer are actually stored in the thread context (joinable thread). In future it may become necessary to support non-VCOS threads by using thread local storage to create these objects and associate them with the thread.

Trait Implementations

impl Clone for VCOS_EVENT_WAITER_T

fn clone(&self) -> VCOS_EVENT_WAITER_T

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Copy for VCOS_EVENT_WAITER_T

impl Debug for VCOS_EVENT_WAITER_T

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

Formats the value using the given formatter.