flock | safe file locking library in Go ( originally github | Architecture library

 by   gofrs Go Version: v0.8.1 License: BSD-3-Clause

kandi X-RAY | flock Summary

kandi X-RAY | flock Summary

flock is a Go library typically used in Architecture applications. flock has no bugs, it has a Permissive License and it has low support. However flock has 1 vulnerabilities. You can download it from GitHub.

flock implements a thread-safe sync.Locker interface for file locking. It also includes a non-blocking TryLock() function to allow locking without blocking execution.
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            kandi-support Support

              flock has a low active ecosystem.
              It has 426 star(s) with 58 fork(s). There are 13 watchers for this library.
              OutlinedDot
              It had no major release in the last 12 months.
              There are 9 open issues and 10 have been closed. On average issues are closed in 128 days. There are 4 open pull requests and 0 closed requests.
              It has a neutral sentiment in the developer community.
              The latest version of flock is v0.8.1

            kandi-Quality Quality

              flock has no bugs reported.

            kandi-Security Security

              flock has 1 vulnerability issues reported (0 critical, 0 high, 1 medium, 0 low).

            kandi-License License

              flock is licensed under the BSD-3-Clause License. This license is Permissive.
              Permissive licenses have the least restrictions, and you can use them in most projects.

            kandi-Reuse Reuse

              flock releases are available to install and integrate.
              Installation instructions are not available. Examples and code snippets are available.

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            flock Key Features

            No Key Features are available at this moment for flock.

            flock Examples and Code Snippets

            Initialize TPU .
            pythondot img1Lines of Code : 55dot img1License : Non-SPDX (Apache License 2.0)
            copy iconCopy
            def initialize_system(
                embedding_config: Optional[embedding_pb2.TPUEmbeddingConfiguration] = None,
                job: Optional[Text] = None,
                compilation_failure_closes_chips: bool = True,
                tpu_cancellation_closes_chips: Optional[bool] = None,
            ) ->  
            Initialize TPU .
            pythondot img2Lines of Code : 27dot img2License : Non-SPDX (Apache License 2.0)
            copy iconCopy
            def initialize_system_for_tpu_embedding(
                embedding_config: embedding_pb2.TPUEmbeddingConfiguration,
                job: Optional[Text] = None,
            ) -> ops.Operation:
              """Initializes a distributed TPU Embedding system for use with TensorFlow.
            
              The followi  
            Adjust flock .
            pythondot img3Lines of Code : 25dot img3License : Permissive (MIT License)
            copy iconCopy
            def flock_adjust(self):
                    neighbors = 0
                    self.v_a = vec(0, 0)
                    self.v_c = vec(0, 0)
                    self.v_s = vec(0, 0)
                    for other in mobs:
                        if other != self:
                            if self.pos.distance_squared_to(other.pos) &  

            Community Discussions

            QUESTION

            Does flock maintain a queue when there are multiple files waiting for a lock?
            Asked 2021-Jun-16 at 02:07

            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 02:07

            I tried testing this scenarios with a working example script and I found that the waiting jobs are processed in a random manner.

            Source https://stackoverflow.com/questions/67943132

            QUESTION

            fcntl doesn't lock/unlock the files [Unix - C]
            Asked 2021-May-25 at 22:36

            I'm trying to use fcntl lib (at UNIX c programming) to lock or unlock files but seems isn't lock and I don't know why. I don't receive any error, it looks like that the program doing the lock but actually i can read/write the file and isn't locked

            ...

            ANSWER

            Answered 2021-May-25 at 22:36

            It's very bold of you to claim you have locked the file when you didn't check the result of fcntl.

            Anyway, that is the expected behaviour. All getting a lock does is prevent others from getting a lock.[1] It doesn't prevent anyone from reading from or writing to the file.

            1. A write lock prevents anyone from getting a lock, while a read lock only prevent write locks from being obtained.

            Source https://stackoverflow.com/questions/67695983

            QUESTION

            How can I fix an assertion failure that states 'vector subscript out of range'
            Asked 2021-May-15 at 23:04

            Other questions that I viewed before posting this question:

            Debug Assertion Failed: Vector subscript out of range

            Debug Assertion Failed Vector Subscript Out of Range C++

            I am working on a Boids project, details of which can be found here:

            https://www.red3d.com/cwr/boids/

            From what I can gather my issue is something to do with an index getting accessed by the function but no data is present in the index. I had this issue yesterday in a different area of my code and fixed it by making one of my getters return a reference rather than a copy of a class object. That approach seems to not be the issue today.

            Below is my code:

            This code is a snippet from my function that handles simulation events. This is the code that I have narrowed down the issue to.

            ...

            ANSWER

            Answered 2021-May-15 at 22:42

            I see nothing in this code that can cause an out of bounds access. However, you should not increment i on any loop iteration that removes an organism, otherwise you will skip the next organism in the list.

            Imagine on the 1st loop iteration, the organism at index 0 needs to be removed. Subsequent organisms move down the list. On the next loop iteration, i gets incremented to 1, and the organism that had moved into index 0 is skipped.

            Try this instead:

            Source https://stackoverflow.com/questions/67551591

            QUESTION

            What does `flock -u` actually do?
            Asked 2021-May-03 at 15:29

            I'm playing around with the command flock, which obtains and releases locks on files. For example, if I run

            ...

            ANSWER

            Answered 2021-May-03 at 15:29

            Here's an example with -u working with file descriptor 9 open on a file mylock, successfully unlocking 9 so that a backgrounded flock mylock can proceed. Note that flock 9 cannot also have a command as in that case the "9" is taken to be a filename, not an fd.

            Source https://stackoverflow.com/questions/67351646

            QUESTION

            Why has my quadtree made no improvement to performance?
            Asked 2021-May-02 at 13:02

            I have a boids flocking simulation setup. It originally worked by having every boid loop through every boid so that they all constantly know where each other are at in order to tell if they are close or far away, but then I switched to a quadtree design so that boids only have to loop through boids that are actually nearby. However, it has made virtually no improvement to the simulation's FPS. It's as if I'm still looping through every single boid.

            Is there some mistake in my implementation? Repo is here, relevant code is mostly in main.js, quadtree.js, and boid.js. LIve site is here

            ...

            ANSWER

            Answered 2021-May-02 at 13:02

            The reason why you are not seeing obvious performance gains from the Quadtree is because of the nature of your simulation. Currently, the default separation causes a large number of boids to "converge" to the same position.

            Lots of objects in the same position is going to negate possible speedups due to spatial partitioning. If all the objects are in the same or near position, boids in the area a forced to check against all other boids in the area.

            You can demonstrate to yourself that your Quadtree is working by watching or profiling your application with its default settings. Now turn separation up to maximum. You will see visually, or through profiling, that as the boids spread out more evenly, the FPS increases significantly. This is because the Quadtree can now prevent computations thanks to its spatial partitioning.

            With default low separation:

            With maximum separation:

            You can see how performance is increased in the second image. Also note, that the conjecture by another commentor that it is the construction of the Quadtree (insert) that is taking up all the time is wrong.

            While in some applications you may be able to update a Quadtree as things move around, since in this simulation every constituent moves every frame, reconstructing the Quadtree from scratch is less work, then taking every object out and reinserting it into its new position.

            The advice to skip square-rooting and just use the distance-squared is good though as this will get you a bit more performance.

            Source https://stackoverflow.com/questions/67351311

            QUESTION

            how to display cities in one dropdown based on selected state in other dropdown using json data in angular ionic?
            Asked 2021-Apr-27 at 16:44

            following are my files for html, .ts and json . As json data was very extensive therefore i have just added a few states and their cities. my 1st dropdown is showing all states. Now I want to match my 1st dropdown's selected value of state with a key "state" in "cities" object in my json file so i can populate 2nd dropdown with cities relevant to that state. and I want to do this in function "getCitiesForSelectedState". please help me find solution for this.

            //.ts file

            ...

            ANSWER

            Answered 2021-Apr-27 at 16:44

            You can do it with the $event parameter. Make sure to compare your values safely.

            If your value is not in the right type or has spaces or unwanted chars, this c.state == val might not work.

            You can use the trim function to compare your value safely: c.state.trim() == val.trim()

            HTML

            Source https://stackoverflow.com/questions/67284495

            QUESTION

            Several commands in one line for cronjob in hiera (Puppet) yaml
            Asked 2021-Apr-14 at 09:22

            I have hieradata yaml file with a lot of options and some cronjobs I want to add one more cronjob that contain several bash commands in it with quotes:

            ...

            ANSWER

            Answered 2021-Mar-03 at 16:10

            You need a space between your : and your >. This is what you want:

            Source https://stackoverflow.com/questions/66459775

            QUESTION

            OpenGL - Why am i getting this error? COMPILATION_FAILED version '330' is not supported
            Asked 2021-Mar-26 at 10:06

            I'm using Xcode (Version 12.0.1) on macOS 10.15.7.

            I brew installed the latest versions of glew, glfw, glm with Homebrew, and tried running this simple code snippet, my OpenGL version seems to be incompatible with the shaders used.

            I do not want to change the code, any way to downgrade the shaders? (Could it be done with Homebrew as well?)

            Here's the code:

            ...

            ANSWER

            Answered 2021-Mar-26 at 10:06

            You're restricted to OpenGL 2.1 Context when calling OpenGL from a Unix System perspective on MacOSX. In order to get OpenGL3.2 in XCode use GLKit (GLK) Library functions to automatically retrieve a GL 3.2 context. These libraries are all now deprecated past OSX 10.14.

            Source https://stackoverflow.com/questions/65855509

            QUESTION

            Why does typescript not narrow down a type in a forEach loop?
            Asked 2021-Mar-20 at 20:44

            I have created this simple snippet of code which is a basic representation of what I am really trying to do while working with React Contexts and Reducers.

            I have 2 objects containing functions. 1 for creating. bird/s and one for creating fish; all of which return strings.

            I then have a third function which can take a string as a parameter and simply console.logs it

            Essentially, what i am doing with the following snippet of code is combining the 2 objects, passing their returned string directly as an argument to the display function and wrapping the display function in another function.

            ...

            ANSWER

            Answered 2021-Mar-20 at 20:44

            Let's ignore the forEach loop for a second and just look at the displayFunctions that we are creating. You can call:

            Source https://stackoverflow.com/questions/66724532

            QUESTION

            Python writing to file from multiple separate Python processes, do I have to lock file?
            Asked 2021-Mar-04 at 10:35

            I have a Python script that is running in a number of different Kubernetes pods at all times (minimum 1, max ~100 at the same time).

            These processes are largely independent of each other, except that at one point, they have to write to the same file (last_appended.txt) in the following fashion:

            ...

            ANSWER

            Answered 2021-Mar-04 at 10:10

            Unrelated: using w mode in this context is weird, do not you mean a mode here?

            As you are using fcntl I shall assume a Unix-like system here

            If you do not use locks, you have what is called a race condition. It means that under small load, the risk of problem is close to 0, but it could increase under higher load. This us something that sysadmins hate, because it leads to non reproducible problems.

            A lock costs indeed some resources, but under normal load (where the non locking version would not experience any problems), there would be no contention on that lock, so it should not be noticeable. Under heavy load, it would prevent garbled messages if two processes tried to write at the same time.

            If you want to prevent contention under heavy load, you could wait with a short timeout. It is easy on a number of systems or requires explicitely calling alarm on some others. If the lock could be acquired, just proceed with writing to the file. Else, skip that writing and if possible log (elsewhere) the error condition for later analysis.

            Source https://stackoverflow.com/questions/66472333

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

            Vulnerabilities

            No vulnerabilities reported

            Install flock

            You can download it from GitHub.

            Support

            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

            https://github.com/gofrs/flock.git

          • CLI

            gh repo clone gofrs/flock

          • sshUrl

            git@github.com:gofrs/flock.git

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