How about adding async interfaces to some blocking functions?

[taeguk]

For example, there is a function called cpu_percent().
Now, this function is just blocking with a interval parameter.
A user must use multi-thread to utilize cpu during the interval.
I want to use a asyncio feature for it.
How about adding async interfaces to some blocking functions?

[giampaolo]

cpu_percent() can already be used in a non-blocking manner: just specify interval=0 or interval=None (which is the default BTW). The first time it is called it will return a meaningless 0.0 value.

[taeguk]

I know what you say.
I explain a need of async when a user want to use cpu_percent() with interval > 0.0.

[giampaolo]

from the doc:

When interval is > 0.0 compares system CPU times elapsed before and after the interval (blocking). When interval is 0.0 or None compares system CPU times elapsed since last call or module import, returning immediately (non-blocking).

[giampaolo]

https://pythonhosted.org/psutil/#psutil.cpu_percent

[giampaolo]

There is no need to change cpu_percent() so that it works with the new
async keyword because if you specify timeout=0 it already returns
immediately. It is already non-blocking / asynchronous, trust me. =)

On Wed, Aug 31, 2016 at 3:06 PM, Taeguk Kwon notifications@github.com
wrote:

async cpu_percent(interval = None, _args, *_kwargs):
psutil.cpu_percent(_args, *_kwargs)
await asyncio.sleep(interval)

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[taeguk]

async def cpu_percent(interval = None, *args, **kwargs):
    if interval is not None and interval > 0.0:
        psutil.cpu_percent(*args, **kwargs)
        await asyncio.sleep(interval)
    return psutil.cpu_percent(*args, **kwargs)

Okay, I got it. I can do my hope through the above codes.