fiber | userland threads - Boost | Job Scheduling library

 by   boostorg C++ Version: Current License: No License

kandi X-RAY | fiber Summary

kandi X-RAY | fiber Summary

fiber is a C++ library typically used in Data Processing, Job Scheduling applications. fiber has no bugs, it has no vulnerabilities and it has low support. You can download it from GitHub.

Boost.fiber provides a framework for micro-/userland-threads (fibers) scheduled cooperatively. The API contains classes and functions to manage and synchronize fibers similar to boost.thread. A fiber is able to store the current execution state, including all registers and CPU flags, the instruction pointer, and the stack pointer and later restore this state. The idea is to have multiple execution paths running on a single thread using a sort of cooperative scheduling (threads are preemptively scheduled) - the running fiber decides explicitly when it yields to allow another fiber to run (context switching). A context switch between threads costs usually thousands of CPU cycles on x86 compared to a fiber switch with less than 100 cycles. A fiber can only run on a single thread at any point in time.
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            kandi-support Support

              fiber has a low active ecosystem.
              It has 394 star(s) with 96 fork(s). There are 28 watchers for this library.
              OutlinedDot
              It had no major release in the last 6 months.
              There are 19 open issues and 138 have been closed. On average issues are closed in 503 days. There are 2 open pull requests and 0 closed requests.
              It has a neutral sentiment in the developer community.
              The latest version of fiber is current.

            kandi-Quality Quality

              fiber has no bugs reported.

            kandi-Security Security

              fiber has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.

            kandi-License License

              fiber does not have a standard license declared.
              Check the repository for any license declaration and review the terms closely.
              OutlinedDot
              Without a license, all rights are reserved, and you cannot use the library in your applications.

            kandi-Reuse Reuse

              fiber releases are not available. You will need to build from source code and install.

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            fiber Key Features

            No Key Features are available at this moment for fiber.

            fiber Examples and Code Snippets

            Calculate the log probability of the fiber .
            pythondot img1Lines of Code : 14dot img1License : Non-SPDX (Apache License 2.0)
            copy iconCopy
            def _log_prob(self, y):
                # For caching to work, it is imperative that the bijector is the first to
                # modify the input.
                x = self.bijector.inverse(y)
                event_ndims = self._maybe_get_static_event_ndims()
            
                ildj = self.bijector.inverse_lo  
            Compute the log probability for each fiber .
            pythondot img2Lines of Code : 13dot img2License : Non-SPDX (Apache License 2.0)
            copy iconCopy
            def _finish_log_prob_for_one_fiber(self, y, x, ildj, event_ndims):
                """Finish computation of log_prob on one element of the inverse image."""
                x = self._maybe_rotate_dims(x, rotate_right=True)
                log_prob = self.distribution.log_prob(x)
                if  
            Computes the probability for each fiber .
            pythondot img3Lines of Code : 13dot img3License : Non-SPDX (Apache License 2.0)
            copy iconCopy
            def _finish_prob_for_one_fiber(self, y, x, ildj, event_ndims):
                """Finish computation of prob on one element of the inverse image."""
                x = self._maybe_rotate_dims(x, rotate_right=True)
                prob = self.distribution.prob(x)
                if self._is_maybe_  

            Community Discussions

            QUESTION

            Using std::atomic with futex system call
            Asked 2021-Jun-15 at 20:48

            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 20:48

            You 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::atomic to u/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:

            Source https://stackoverflow.com/questions/67034029

            QUESTION

            Why does my pre-signed URL for my s3 bucket look different when deployed?
            Asked 2021-Jun-14 at 00:04

            My python (Django) application stores confidential documents and has a private bucket in AWS S3.

            When you make a request for the resource, it uses boto3 to generate a pre-signed URL to be able to download the document.

            The code to do so is as follows:

            ...

            ANSWER

            Answered 2021-Jun-14 at 00:04

            Your code on your EB instance uses instance role to provide it with AWS credentials. When you do this, x-amz-security-token is used which is a regular part of AWS credentails when you use IAM roles.

            In contrast, when you run it locally, you use IAM user for AWS credentials. In that case, token is not used.

            Source https://stackoverflow.com/questions/67963341

            QUESTION

            Treetable with horizontal scrollbar
            Asked 2021-Jun-11 at 18:11
            Codepen example

            Here's a codepen demonstrating a treetable with groups:

            https://codepen.io/dharmatech/full/mdWGbox

            Screenshot

            Screenshot of the above treetable:

            The Issue

            Only some of the columns are shown; there are many more available. However, note that there is no horizontal scrollbar shown at the bottom to bring the other columns into view.

            Is there a way to turn on a horizontal scrollbar?

            Approaches I've explored

            I've tried each of these:

            ...

            ANSWER

            Answered 2021-Jun-11 at 09:04

            Your code is correct. And TreeTable does show all columns, you just miss the horizontal scroll at bottom of the grid.

            To fix the situation, you need to

            • init UI in container ( currently it is atached to the body ). To do so you need to add container property to the UI configuration

            Source https://stackoverflow.com/questions/67929929

            QUESTION

            Adjust the layout of table when in mobile view
            Asked 2021-Jun-08 at 21:42

            For my site I have a table which I've done here: https://jsfiddle.net/stw4jyq8/

            ...

            ANSWER

            Answered 2021-Jun-08 at 21:42

            As a first lead, and despite agreeing with the suggestions for a select box, here's how you would have to do it with 3 tables for mobile:

            • Show your table as you did, but set a class to the columns to ease hiding them and styling them in general
            • Repeat your table 2 more times with only one data column each time (per 100g, per buttery)
            • Hide those 2 additional tables on large screens (by default) using CSS
            • Use a media query to trigger the changes:
              • Hide 3rd and 4th columns in your large table
              • Show both mobile tables
              • Adjust widths for better display

            You can see the change in display in the below snippet by adjusting your window size

            Source https://stackoverflow.com/questions/67894559

            QUESTION

            Fibre CORS Middleware returning null Access-Control-Allow-Origin Header Value
            Asked 2021-Jun-07 at 13:26

            I'm using the Go Fibre Web Framework and its complementary CORS Middleware component to implement my RESTful API. I configure CORS as specified in the official documentation however, rather oddly, when I then go on to call the API from cURL or Postman the: "Access-Control-Allow-Origin" Header is present in response but its value is: null and thus requests from any host appear to be being accepted.

            Here is my setup as per the current documentation (which you may find here):

            ...

            ANSWER

            Answered 2021-Jun-07 at 13:26

            "Access-Control-Allow-Origin" Header is present in response but its value is: null and thus requests from any host appear to be being accepted.

            That is not how it works. The header Access-Control-Allow-Origin should either contain the origin for the specific client making the request, or the wildcard *, in order to be accepted by the browser. If the origin header does not satisfy the origins you allowed, the response header will be an empty string as you can see in the source code.

            Source https://stackoverflow.com/questions/67871370

            QUESTION

            How to build boost as shared libraries for Android
            Asked 2021-Jun-07 at 07:22

            I successfully compiled boost 1.70 for Android armeabiv7a with NDK r21b.

            I used user-config.jam:

            ...

            ANSWER

            Answered 2021-Jun-07 at 07:22

            By looking where a "ld.exe" was present in C:\Android\android_sdk\ndk-bundle\toolchains\llvm folder, I found some under C:\Android\r21a_Qt5_14\android_sdk\ndk-bundle\toolchains\llvm\prebuilt\windows-x86_64\\bin so I concluded that target platform was probably missing.

            I added:

            Source https://stackoverflow.com/questions/67834326

            QUESTION

            Using React-Three-Fiber
            Asked 2021-Jun-04 at 19:33

            I'm currently using React Three Fiber to simply render a sun and the earth orbiting it to test it out. However after I added code to apply textures to the respective spheres every time I run the development server for testing, the spheres fail to render. I've tried looking for people with the same issue and have not had any luck. Here is my code for the program.

            ...

            ANSWER

            Answered 2021-Jun-04 at 19:33

            You need to put your component in a because it needs to load a texture so the way to do it is to wait for it to load using suspense.

            You can specify an object to show while it is loading by doing

            Source https://stackoverflow.com/questions/67796887

            QUESTION

            Calculate emmeans using multiple values of the continuous predictor
            Asked 2021-Jun-03 at 23:49

            This question relates to Emmeans continuous independant variable

            I want to calculate EMM for at least three values of diameter, i.e., min, mean, and max, with a one-liner. Specifying cov.reduce = range gives the estimates using min and max diameter only, removing cov.reduce = range gives the estimates using the mean diameter.

            ...

            ANSWER

            Answered 2021-Jun-03 at 23:49

            This is easily done, since you can specify any function. So try

            Source https://stackoverflow.com/questions/67828152

            QUESTION

            panic: runtime error: invalid memory address or nil pointer dereference (time and again)
            Asked 2021-Jun-03 at 16:12

            I am very new to golang and for the most part have no idea what im doing so far. I tried to run a simple find() query to get all documents from my databse and I cant seem to get it to work i keep getting this error

            ...

            ANSWER

            Answered 2021-Jun-03 at 13:18

            DB is nil, because var DB=database.DB runs before database.DB is initialized.

            Use database.DB directly.

            Source https://stackoverflow.com/questions/67822084

            QUESTION

            useEffect is not firing consistently
            Asked 2021-Jun-02 at 23:30

            The component is creating a positionalAudio within a 3D-scene and the audio object is tweakable by using leva. The object is being created just as it should and tweaking the position and rotation just works fine. What is not working properly is changing the volume. In the leva UI I can drag the handle of the volume an change it but no effect is taking place (I'm assuming it's because the useEffect is firing before the handle is released and effectivly no change in the value has been taking place yet. At least a console log is shown before I release the handle). When I put the new value inside the input field an press enter useEffect is firing and the volume is changing. But it works only this time and afterwards not anymore.

            ...

            ANSWER

            Answered 2021-Jun-02 at 23:30
            useEffect(() => {
                sound.current.setVolume(volume)
            }, [sound.current])
            

            Source https://stackoverflow.com/questions/67813349

            Community Discussions, Code Snippets contain sources that include Stack Exchange Network

            Vulnerabilities

            No vulnerabilities reported

            Install fiber

            You can download it from GitHub.

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            For any new features, suggestions and bugs create an issue on GitHub. If you have any questions check and ask questions on community page Stack Overflow .
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            https://github.com/boostorg/fiber.git

          • CLI

            gh repo clone boostorg/fiber

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            git@github.com:boostorg/fiber.git

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