Struct Event

struct Event {
    counter: Cell<u64>,
    is_nonblock: bool,
    clock: RefCell<VClock>,
    blocked_read_tid: RefCell<Vec<ThreadId>>,
    blocked_write_tid: RefCell<Vec<ThreadId>>,
}

A kind of file descriptor created by eventfd. The Event type isn’t currently written to by eventfd. The interface is meant to keep track of objects associated with a file descriptor. For more information see the man page below:

https://man.netbsd.org/eventfd.2

Fields

counter: Cell<u64>

The object contains an unsigned 64-bit integer (uint64_t) counter that is maintained by the kernel. This counter is initialized with the value specified in the argument initval.

is_nonblock: bool

clock: RefCell<VClock>

blocked_read_tid: RefCell<Vec<ThreadId>>

A list of thread ids blocked on eventfd::read.

blocked_write_tid: RefCell<Vec<ThreadId>>

A list of thread ids blocked on eventfd::write.

Trait Implementations

impl Debug for Event

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

Formats the value using the given formatter.

impl FileDescription for Event

fn read<'tcx>( &self, self_ref: &FileDescriptionRef, _communicate_allowed: bool, ptr: Pointer, len: usize, dest: &MPlaceTy<'tcx>, ecx: &mut MiriInterpCx<'tcx>, ) -> InterpResult<'tcx>

Read the counter in the buffer and return the counter if succeeded.

fn write<'tcx>( &self, self_ref: &FileDescriptionRef, _communicate_allowed: bool, ptr: Pointer, len: usize, dest: &MPlaceTy<'tcx>, ecx: &mut MiriInterpCx<'tcx>, ) -> InterpResult<'tcx>

A write call adds the 8-byte integer value supplied in its buffer (in native endianness) to the counter. The maximum value that may be stored in the counter is the largest unsigned 64-bit value minus 1 (i.e., 0xfffffffffffffffe). If the addition would cause the counter’s value to exceed the maximum, then the write either blocks until a read is performed on the file descriptor, or fails with the error EAGAIN if the file descriptor has been made nonblocking.

A write fails with the error EINVAL if the size of the supplied buffer is less than 8 bytes, or if an attempt is made to write the value 0xffffffffffffffff.

fn name(&self) -> &'static str

fn close<'tcx>( self: Box<Self>, _communicate_allowed: bool, _ecx: &mut MiriInterpCx<'tcx>, ) -> InterpResult<'tcx, Result<()>>

fn as_unix(&self) -> &dyn UnixFileDescription

fn seek<'tcx>( &self, _communicate_allowed: bool, _offset: SeekFrom, ) -> InterpResult<'tcx, Result<u64>>

Seeks to the given offset (which can be relative to the beginning, end, or current position). Returns the new position from the start of the stream.

fn metadata<'tcx>(&self) -> InterpResult<'tcx, Result<Metadata>>

fn is_tty(&self, _communicate_allowed: bool) -> bool

impl UnixFileDescription for Event

fn get_epoll_ready_events<'tcx>(&self) -> InterpResult<'tcx, EpollReadyEvents>

Check the readiness of file description.

fn pread<'tcx>( &self, _communicate_allowed: bool, _offset: u64, _ptr: Pointer, _len: usize, _dest: &MPlaceTy<'tcx>, _ecx: &mut MiriInterpCx<'tcx>, ) -> InterpResult<'tcx>

Reads as much as possible into the given buffer ptr from a given offset. len indicates how many bytes we should try to read. dest is where the return value should be stored: number of bytes read, or -1 in case of error.

fn pwrite<'tcx>( &self, _communicate_allowed: bool, _ptr: Pointer, _len: usize, _offset: u64, _dest: &MPlaceTy<'tcx>, _ecx: &mut MiriInterpCx<'tcx>, ) -> InterpResult<'tcx>

Writes as much as possible from the given buffer ptr starting at a given offset. ptr is the pointer to the user supplied read buffer. len indicates how many bytes we should try to write. dest is where the return value should be stored: number of bytes written, or -1 in case of error.

fn flock<'tcx>( &self, _communicate_allowed: bool, _op: FlockOp, ) -> InterpResult<'tcx, Result<()>>

Layout

Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...) attributes. Please see the Rust Reference's “Type Layout” chapter for details on type layout guarantees.

Size: 152 bytes