wasi:io/poll@0.2.0wasi:clocks/monotonic-clock@0.2.0wasi:clocks/wall-clock@0.2.0A poll API intended to let users wait for I/O events on multiple handles at once.
resource pollablepollable represents a single I/O event which may be ready, or not.[method]pollable.ready: funcReturn the readiness of a pollable. This function never blocks.
Returns true when the pollable is ready, and false otherwise.
[method]pollable.block: funcblock returns immediately if the pollable is ready, and otherwise
blocks until ready.
This function is equivalent to calling poll.poll on a list
containing only this pollable.
poll: funcPoll for completion on a set of pollables.
This function takes a list of pollables, which identify I/O sources of interest, and waits until one or more of the events is ready for I/O.
The result list<u32> contains one or more indices of handles in the
argument list that is ready for I/O.
If the list contains more elements than can be indexed with a u32
value, this function traps.
A timeout can be implemented by adding a pollable from the wasi-clocks API to the list.
This function does not return a result; polling in itself does not
do any I/O so it doesn't fail. If any of the I/O sources identified by
the pollables has an error, it is indicated by marking the source as
being reaedy for I/O.
WASI Monotonic Clock is a clock API intended to let users measure elapsed time.
It is intended to be portable at least between Unix-family platforms and Windows.
A monotonic clock is a clock which has an unspecified initial value, and successive reads of the clock will produce non-decreasing values.
It is intended for measuring elapsed time.
type pollable#### `type instant` `u64`
An instant in time, in nanoseconds. An instant is relative to an unspecified initial value, and can only be compared to instances from the same monotonic-clock.
type durationu64
A duration of time, in nanoseconds.
now: funcRead the current value of the clock.
The clock is monotonic, therefore calling this function repeatedly will produce a sequence of non-decreasing values.
resolution: funcQuery the resolution of the clock. Returns the duration of time corresponding to a clock tick.
subscribe-instant: funcCreate a pollable which will resolve once the specified instant
occured.
pollable>subscribe-duration: funcCreate a pollable which will resolve once the given duration has
elapsed, starting at the time at which this function was called.
occured.
pollable>WASI Wall Clock is a clock API intended to let users query the current time. The name "wall" makes an analogy to a "clock on the wall", which is not necessarily monotonic as it may be reset.
It is intended to be portable at least between Unix-family platforms and Windows.
A wall clock is a clock which measures the date and time according to some external reference.
External references may be reset, so this clock is not necessarily monotonic, making it unsuitable for measuring elapsed time.
It is intended for reporting the current date and time for humans.
record datetimeA time and date in seconds plus nanoseconds.
seconds: u64nanoseconds: u32now: funcRead the current value of the clock.
This clock is not monotonic, therefore calling this function repeatedly will not necessarily produce a sequence of non-decreasing values.
The returned timestamps represent the number of seconds since 1970-01-01T00:00:00Z, also known as POSIX's Seconds Since the Epoch, also known as Unix Time.
The nanoseconds field of the output is always less than 1000000000.
resolution: funcQuery the resolution of the clock.
The nanoseconds field of the output is always less than 1000000000.