waiting | Python utility library for waiting for predicates
kandi X-RAY | waiting Summary
kandi X-RAY | waiting Summary
Python utility library for waiting for predicates
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Top functions reviewed by kandi - BETA
- Waits until the result is reached
- Wait for the result of a predicate
- Generates a sleep generator
- A context manager for sleep
- Raise the exception
- Make a deadline
- Raises exception with traceback
- Raise exception
waiting Key Features
waiting Examples and Code Snippets
Community Discussions
Trending Discussions on waiting
QUESTION
Would be great if someone can help me understand how flock functions. Lets says I have the below scenario:
...ANSWER
Answered 2021-Jun-16 at 02:07I tried testing this scenarios with a working example script and I found that the waiting jobs are processed in a random manner.
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 currently trying to build OpenPose. First, I will try to describe the environment and then the error emerging from it. Caffe, being built from source, resides in its entirety in [/Users...]/openpose/3rdparty instead of the usual location (I redact some parts of the filepaths in this post for privacy). All of its include files can be found in [/Users...]/openpose/3rdparty/caffe/include/caffe. After entering this command:
...ANSWER
Answered 2021-Jun-15 at 18:43You are using cmake. The makefiles generated by cmake don't conform to "standard" makefile conventions; in particular they don't use the CXXFLAGS variable.
When you're using cmake, you're not expected to modify the compiler options by changing the invocation of make. Instead, you're expected to modify the compiler options by either editing the CMakeLists.txt file, or else by providing an overridden value to the cmake command line that is used to generate your makefiles.
QUESTION
I have written the code to sum up elements of an array with
Recursion
...ANSWER
Answered 2021-Jun-15 at 15:27As I understood, in the tail recursion the base method shouldn't be waiting for the recursive method to finish executing and shouldn't be dependent on its output
That is not quite correct. Tail recursion mostly enables the compiler to apply tail call optimization (if supported), i.e. to rewrite the recursion to a regular loop instead. This has the advantage not reduced memory usage in the stack. It has nothing to do with 'not waiting'.
In the first example it has to keep one stack frame for each item in the list, and if you have a long list there is a chance you will run out of stack memory and get a stackoverflow.
In the tail recursive case the current stack frame is no longer needed when it reaches the tail-call, so the same stack frame can be re-used for each call, and that should result in code sort of equivalent to a regular loop.
Is this implementation the right way to achieve that?
It looks fine to me. But that does not necessarily mean that the optimization will be applied, it seem to depend on the compiler version, and may have other requirements. See Why doesn't .NET/C# optimize for tail-call recursion? In general I would recommend relying on the language specification and not compiler optimization for correct function of your program.
Note that recursion is often not the ideal approach in c#. For something simple as a sum it is easier, faster, and more readable to use a regular loop. For more complicated cases, like iterating over trees, recursion can be appropriate, but then tail-call optimization will not help very much in that case.
QUESTION
A few days ago my code for sending Push notifications stopped working :(
The program began to hang on the last line apnsBroker.Stop();
I use NuGet package PushSharp.Core https://github.com/mitch-tofi/PushSharp.Core
...ANSWER
Answered 2021-Apr-27 at 13:30We're looking in to the same issue currently and it seems apple are disabling the old binary interface which push sharp uses.
https://developer.apple.com/news/?id=c88acm2b
pushsharp has it on the roadmap to support the new interface but not completed yet.
Found this library which seems easy enough to use as a solution. hope this helps.
QUESTION
Hi so I'm starting to learn PHP and one of the first steps was to run the Development Server to start practicing, the line I used was:
...ANSWER
Answered 2021-Jun-15 at 14:30The server isn't "frozen", it's doing its job, waiting for requests and serving responses. Go to http://localhost:4000 in your web browser to request something from it.
Specifically, since you didn't specify a PHP script for it to run, it's waiting for you to request a particular file - if you have a file called "index.php", you can go to "http://localhost:4000/index.php" in your browser, if it's called "arnoldo-rocks.php", go to "http://localhost:4000/arnoldo-rocks.php", and so on.
It will carry on doing that until you kill it with Ctrl-C
If you want to run it in the background while you run other commands, and are using a Linux/Unix shell (not CMD or PowerShell), you can run it this way:
QUESTION
I have a table named Drug basically when a drug is inserted it takes is_accepted 0 by default so it needs to be accepted by an administrator.
All the drugs are shown on the website if their is_accepted value is 1
I have created a command DeleteunacceptedDrugs that will run every 12 hours.
This command will get all the drugs that their value is_accepted is 0 and check their waiting time (how long that they are in wait state)
...ANSWER
Answered 2021-Jun-15 at 14:25You can do the diff directly in the query:
QUESTION
I've been using the YouTube IFrame API to shuffle multiple of my playlists together. I've got a very bare-bones HTML page with a 'next' and 'previous' button, and a bunch of javascript that loads up and plays videos and handles the button events.
The general order of events when the script loads is
...ANSWER
Answered 2021-Jun-15 at 13:19This issue appears to have resolved itself. I suspect it was a bug in the iframe api or maybe the youtube backend which has been fixed by the youtube engineers. So iframe team, if you see this, thanks!
QUESTION
Machine Setting:
GPU: GeForce RTX 3060
Driver Version: 460.73.01
CUDA Driver Veresion: 11.2
Tensorflow: tensorflow-gpu 1.14.0
CUDA Runtime Version: 10.0
cudnn: 7.4.1
Note:
- CUDA Runtime and cudnn version fits the guide from Tensorflow official documentation.
- I've also tried for TensorFlow-gpu = 2.0, still the same problem.
Problem:
I am using Tensorflow for an objection detection task. My situation is that the program will stuck at
2021-06-05 12:16:54.099778: I tensorflow/stream_executor/platform/default/dso_loader.cc:42] Successfully opened dynamic library libcublas.so.10
for several minutes.
And then stuck at next loading process
2021-06-05 12:21:22.212818: I tensorflow/stream_executor/platform/default/dso_loader.cc:42] Successfully opened dynamic library libcudnn.so.7
for even longer time. You may check log.txt for log details.
After waiting for around 30 mins, the program will start to running and WORK WELL.
However, whenever program invoke self.session.run(...), it will load the same two library related to cuda (libcublas and libcudnn) again, which is time-wasted and annoying.
I am confused that where the problem comes from and how to resolve it. Anyone could help?
===================================
Update
After @talonmies 's help, the problem was resolved by resetting the environment with correct version matching among GPU, CUDA, cudnn and tensorflow. Now it works smoothly.
...ANSWER
Answered 2021-Jun-15 at 13:04Generally, if there are any incompatibility between TF, CUDA and cuDNN version you can observed this behavior.
For GeForce RTX 3060, support starts from CUDA 11.x. Once you upgrade to TF2.4 or TF2.5 your issue will be resolved.
For the benefit of community providing tested built configuration
CUDA Support Matrix
QUESTION
I created an image and pushed to dockerHub, from an angular project. I can see that if I will go to localhost:80 it will open the portal. This are the steps:
...ANSWER
Answered 2021-Jun-14 at 15:35Your repository is private and requires login to pull image.
You need to create a registry credentials secret for kubernetes, as it do not uses docker credentials.
See https://kubernetes.io/docs/tasks/configure-pod-container/pull-image-private-registry/
1. Create a secret named regcred:
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Install waiting
You can use waiting like any standard Python library. You will need to make sure that you have a development environment consisting of a Python distribution including header files, a compiler, pip, and git installed. Make sure that your pip, setuptools, and wheel are up to date. When using pip it is generally recommended to install packages in a virtual environment to avoid changes to the system.
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