sleep | basic bedtime calculator to find 6 sleep | Date Time Utils library
kandi X-RAY | sleep Summary
kandi X-RAY | sleep Summary
A basic bedtime calculator to find 6 sleep-cycle times for good night’s sleep.
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sleep Examples and Code Snippets
Lines of Code : 20License : Non-SPDX (Apache License 2.0)
Copydef main(argv):
del argv # not used
delay_seconds = 1.0
print("""
Using synchronous sleep op with each of 50 ops sleeping for about %0.2f seconds,
so total time is about %0.2f * ceil(50 / NUMBER_OF_THREADS). 16 is a typical
number of threads, def AsyncSleep(delay, name=None):
"""Pause for `delay` seconds (which need not be an integer).
This is an asynchronous (non-blocking) version of a sleep op. It includes
any time spent being blocked by another thread in `delay`. If it is blocke def sleep(sleep_microseconds):
"""Sleeps for `sleep_microseconds` before producing each input element.
Args:
sleep_microseconds: The number of microseconds to sleep before producing an
input element.
Returns:
A `Dataset` transfo Community Discussions
Trending Discussions on sleep
QUESTION
In C++20, we got the capability to sleep on atomic variables, waiting for their value to change.
We do so by using the std::atomic::wait method.
Unfortunately, while wait has been standardized, wait_for and wait_until are not. Meaning that we cannot sleep on an atomic variable with a timeout.
Sleeping on an atomic variable is anyway implemented behind the scenes with WaitOnAddress on Windows and the futex system call on Linux.
Working around the above problem (no way to sleep on an atomic variable with a timeout), I could pass the memory address of an std::atomic to WaitOnAddress on Windows and it will (kinda) work with no UB, as the function gets void* as a parameter, and it's valid to cast std::atomic to void*
On Linux, it is unclear whether it's ok to mix std::atomic with futex. futex gets either a uint32_t* or a int32_t* (depending which manual you read), and casting std::atomic to u/int* is UB. On the other hand, the manual says
The uaddr argument points to the futex word. On all platforms, futexes are four-byte integers that must be aligned on a four- byte boundary. The operation to perform on the futex is specified in the futex_op argument; val is a value whose meaning and purpose depends on futex_op.
Hinting that alignas(4) std::atomic should work, and it doesn't matter which integer type is it is as long as the type has the size of 4 bytes and the alignment of 4.
Also, I have seen many places where this trick of combining atomics and futexes is implemented, including boost and TBB.
So what is the best way to sleep on an atomic variable with a timeout in a non UB way? Do we have to implement our own atomic class with OS primitives to achieve it correctly?
(Solutions like mixing atomics and condition variables exist, but sub-optimal)
...ANSWER
Answered 2021-Jun-15 at 20:48You shouldn't necessarily have to implement a full custom atomic API, it should actually be safe to simply pull out a pointer to the underlying data from the atomic and pass it to the system.
Since std::atomic does not offer some equivalent of native_handle like other synchronization primitives offer, you're going to be stuck doing some implementation-specific hacks to try to get it to interface with the native API.
For the most part, it's reasonably safe to assume that first member of these types in implementations will be the same as the T type -- at least for integral values [1]. This is an assurance that will make it possible to extract out this value.
... and casting
std::atomictou/int*is UB
This isn't actually the case.
std::atomic is guaranteed by the standard to be Standard-Layout Type. One helpful but often esoteric properties of standard layout types is that it is safe to reinterpret_cast a T to a value or reference of the first sub-object (e.g. the first member of the std::atomic).
As long as we can guarantee that the std::atomic contains only the u/int as a member (or at least, as its first member), then it's completely safe to extract out the type in this manner:
QUESTION
I am new to rust and I was reading up on using futures and async / await in rust, and built a simple tcp server using it. I then decided to write a quick benchmark, by sending requests to the server at a constant rate, but I am having some strange issues.
The below code should send a request every 0.001 seconds, and it does, except the program reports strange run times. This is the output:
...ANSWER
Answered 2021-Jun-15 at 20:06You are not measuring the elapsed time correctly:
total_send_timemeasures the duration of thespawn()call, but as the actual task is executed asynchronously,start_in.elapsed()does not give you any information about how much time the task actually takes.The
ran intime, as measured bystart.elapsed()is also not useful at all. As you are using blocking sleep operation, you are just measuring how much time your app has spent in thestd::thread::sleep()Last but not least, your
time_to_sleepcalculation is completely incorrect, because of the issue mentioned in point 1.
QUESTION
I'm trying to parallelize a merge-sort algorithm. What I'm doing is dividing the input array for each thread, then merging the threads results. The way I'm trying to merge the results is something like this:
...ANSWER
Answered 2021-Jun-15 at 01:58I'm trying to parallelize a merge-sort algorithm. What I'm doing is dividing the input array for each thread, then merging the threads results.
Ok, but yours is an unnecessarily difficult approach. At each step of the merge process, you want half of your threads to wait for the other half to finish, and the most natural way for one thread to wait for another to finish is to use pthread_join(). If you wanted all of your threads to continue with more work after synchronizing then that would be different, but in this case, those that are not responsible for any more merges have nothing at all left to do.
This is what I've tried:
QUESTION
WWDC21 introduces Swift 5.5, with async/await. Following the Explore structured concurrency in Swift and Meet async/await in Swift WWDC21 sessions, I'm trying to use the async let function.
Here's my Playground code:
...ANSWER
Answered 2021-Jun-11 at 00:14My advice would be: don't try this in a playground. Playgrounds aren't ready for this stuff yet. Your code compiles and runs fine in a real project. Here's an example:
QUESTION
In tkinter I have made a notepad and also added a scrollbar to this notepad. The problem is when I click on the scrollbar (not using any arrow keys nor mouse scroll wheel)
I have tried google but I'm not the best at finding the right websites.
Heres the code to the notepad
...ANSWER
Answered 2021-Jun-15 at 17:13In your code, you aren't using the Listbox. So, I suggest to remove that part completely and do this.
QUESTION
I have a generator object, that loads quite big amount of data and hogs the I/O of the system. The data is too big to fit into memory all at once, hence the use of generator. And I have a consumer that all of the CPU to process the data yielded by generator. It does not consume much of other resources. Is it possible to interleave these tasks using threads?
For example I'd guess it is possible to run the simplified code below in 11 seconds.
...ANSWER
Answered 2021-Jun-15 at 16:02Send your data to separate processes. I used concurrent.futures because I like the simple interface.
This runs in about 11 seconds on my computer.
QUESTION
I create a Pentest tool for educational purposes, so the old version was written using python 2, then I convert it to python 3 and when I try to run the main file pxxtf.py I got multiple errors, I correct most of them but for this one about Circular Import, I try multiple fixes from forums and StackOverFlow and nothing work with me.
When I try to run the main script :
...ANSWER
Answered 2021-Jun-15 at 14:05The error message is saying it all: "most likely due to a circular import".
pxxtf.py
QUESTION
how can i comment/uncomment a line of code by checking and unchecking a checkbox in python with PySimpleGUI?
also i don't know if i wrote the code in correct way but i'm just trying to comment a line of code by checking the checkbox
any other way to do it is also fix my problem
This is my code
...ANSWER
Answered 2021-Jun-15 at 13:23Following code show how to stop a thread to update time by a checkbox.
QUESTION
ANSWER
Answered 2021-Jun-15 at 13:10class=OTSigninButton
QUESTION
I'm doing some scraping, but as I'm parsing approximately 4000 URL's, the website eventually detects my IP and blocks me every 20 iterations.
I've written a bunch of Sys.sleep(5) and a tryCatch so I'm not blocked too soon.
I use a VPN but I have to manually disconnect and reconnect it every now and then to change my IP. That's not a suitable solution with such a scraper supposed to run all night long.
I think rotating a proxy should do the job.
Here's my current code (a part of it at least) :
...ANSWER
Answered 2021-Apr-07 at 15:25Interesting question. I think the first thing to note is that, as mentioned on this Github issue, rvest and xml2 use httr for the connections. As such, I'm going to introduce httr into this answer.
The following code chunk shows how to use httr to query a url using a proxy and extract the html content.
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On a UNIX-like operating system, using your system’s package manager is easiest. However, the packaged Ruby version may not be the newest one. There is also an installer for Windows. Managers help you to switch between multiple Ruby versions on your system. Installers can be used to install a specific or multiple Ruby versions. Please refer ruby-lang.org for more information.
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