pqueue | Go implementation of priority queues

 by   Quentin-M Go Version: Current License: Apache-2.0

kandi X-RAY | pqueue Summary

kandi X-RAY | pqueue Summary

pqueue is a Go library. pqueue has no bugs, it has no vulnerabilities, it has a Permissive License and it has low support. You can download it from GitHub.

pqueue is an open-source collection of priority queues written in Go.
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            kandi-support Support

              pqueue has a low active ecosystem.
              It has 16 star(s) with 1 fork(s). There are 2 watchers for this library.
              OutlinedDot
              It had no major release in the last 6 months.
              There are 1 open issues and 0 have been closed. There are no pull requests.
              It has a neutral sentiment in the developer community.
              The latest version of pqueue is current.

            kandi-Quality Quality

              pqueue has no bugs reported.

            kandi-Security Security

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

            kandi-License License

              pqueue is licensed under the Apache-2.0 License. This license is Permissive.
              Permissive licenses have the least restrictions, and you can use them in most projects.

            kandi-Reuse Reuse

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

            Top functions reviewed by kandi - BETA

            kandi has reviewed pqueue and discovered the below as its top functions. This is intended to give you an instant insight into pqueue implemented functionality, and help decide if they suit your requirements.
            • DecreaseKey decreases the key at the given index .
            • toNode converts a list . Element to a node .
            • New creates a new priority queue .
            Get all kandi verified functions for this library.

            pqueue Key Features

            No Key Features are available at this moment for pqueue.

            pqueue Examples and Code Snippets

            No Code Snippets are available at this moment for pqueue.

            Community Discussions

            QUESTION

            "pthread_join" doesn't return on a just cancelled thread (with "pthread_cancel")
            Asked 2021-Jun-07 at 20:59

            I have a pool of threads (QueueWorkers class) in my program that are released using this logic:

            ...

            ANSWER

            Answered 2021-Jun-07 at 13:52

            Are sure the thread is in a cancelation or your thread cancelation_type is asynchronous?

            From man of pthread_cancel:

            A thread's cancellation type, determined by pthread_setcanceltype(3), may be either asynchronous or deferred (the default for new threads). Asynchronous cancelability means that the thread can be canceled at any time (usually immediately, but the system does not guarantee this). Deferred cancelability means that cancellation will be delayed until the thread next calls a function that is a cancellation point. A list of functions that are or may be cancellation points is provided in pthreads(7).

            I don't think canceling threads is the best ways to make sure that a thread will finish. Perhaps you can send the thread a message that it should stop and make sure the thread does receive the message and will handle it.

            Source https://stackoverflow.com/questions/67872576

            QUESTION

            Segmentation Core Dump Problem in Dijkstra Algorithm
            Asked 2021-Jun-06 at 15:02

            I tried to implement Dijkstra algorithm with adjacency list,the code is exhibiting strange behaviour when i remove the cout statement from updatePriority() function it throws segmentation core dumped error and if the cout statement is included it doesn't throw any error, everything working fine.

            what might be the cause for it ?

            i have included my code below thank you..

            ...

            ANSWER

            Answered 2021-Jun-06 at 14:05

            There is an error in enqueue in this line:

            Source https://stackoverflow.com/questions/67859656

            QUESTION

            How Java PriorityQueue sorting elements
            Asked 2021-Apr-12 at 13:44

            I am writing a simple program using priority queue in which I am adding elements to it, I am not getting how it is sorting the elements internally(java doc says it's based on natural sorting order but how ?).

            Java code :

            PriorityQueue pQueue = new PriorityQueue();

            ...

            ANSWER

            Answered 2021-Apr-11 at 09:19

            You got it right but partially as you have missed the first part of it.

            An unbounded priority queue based on a priority heap. The elements of the priority queue are ordered according to their natural ordering, or by a Comparator provided at queue construction time, depending on which constructor is used.

            AS you can see it's clearly mentioned that it is based on priority heap. Now if you would like to understand what is Heap you can refer Binary Heap or in one line if you wanna understand basically there are 3 types of Heap -> Min & Map. Java's priority queue is using Min Heap, in this case

            the key at root must be minimum among all keys present in Binary Heap and the same property must be recursively true for all nodes in the same tree

            To implement this java use bit shifting also:

            Source https://stackoverflow.com/questions/67042758

            QUESTION

            cx_Freeze executable runs multiple tasks when using multiprocessing and freeze_support
            Asked 2021-Apr-07 at 18:31

            I build an executable with cx_Freeze. I always read that I need to include multiprocessing.freeze_support to avoid multiple tasks of the executable running in the task manager. But if I use multiprocessing and freeze_support I still get two tasks running in the task manager.

            Here is my example GUI named test_wibu.py:

            ...

            ANSWER

            Answered 2021-Apr-07 at 12:07

            According to this excellent answer, the reason for the multiprocessing.freeze_support() call is

            lack of fork() on Windows (which is not entirely true). Because of this, on Windows the fork is simulated by creating a new process in which code, which on Linux is being run in child process, is being run.

            and thus not to avoid multiple tasks of the executable running in the task manager as stated in your premise.

            Therefore, the behavior you observe in the task manager is probably normal and can't be avoided.

            Source https://stackoverflow.com/questions/66890197

            QUESTION

            Why does creating a copy of an object still alter instance variables of original object?
            Asked 2020-Oct-23 at 08:47

            I have two classes. Class Algorithm implements a method findIntersections() which is a sweep line algorithm to check for intersections in O(nLogN) time.

            It also implements a function addSegments which adds objects of type Segment (two points) to a priority Queue based on the x coordinate.

            ...

            ANSWER

            Answered 2020-Oct-23 at 08:47

            First of all, it is crucial to know that assigning an existing object to another variable does not create a copy of the original object:

            Source https://stackoverflow.com/questions/64496171

            QUESTION

            IntelliJ java.lang.NoClassDefFoundError: org/hamcrest/SelfDescribing
            Asked 2020-Oct-16 at 20:43

            Yes before you close this thread I have read all the same question threads saying I need to add hamcrest to classpath. I don't understand what that means or how to do it. I have JDK 14 and don't know why I'm having random problems now. I just want to do JUnit testing.

            ...

            ANSWER

            Answered 2020-Jun-09 at 20:33

            QUESTION

            priority queue as max priority queue not working as expected
            Asked 2020-Sep-06 at 09:45

            I was working on a leetcode question where we need to design the basic twitter functionality , such as follow and unfollow , post a tweet and newsfeed which will give the most recent 10 tweets for a user

            postTweet(userId, tweetId): Compose a new tweet. getNewsFeed(userId): Retrieve the 10 most recent tweet ids in the user's news feed. Each item in the news feed must be posted by users who the user followed or by the user herself. Tweets must be ordered from most recent to least recent. follow(followerId, followeeId): Follower follows a followee. unfollow(followerId, followeeId): Follower unfollows a followee.

            ...

            ANSWER

            Answered 2020-Sep-06 at 09:45

            If I understand your strategy correctly:

            Source https://stackoverflow.com/questions/63762388

            QUESTION

            How to associate allowed_domains with start_urls in scrapy
            Asked 2020-Apr-28 at 04:34

            I have a broad scrapy crawler which takes a csv file of about 20,000 rows. The file has a name, start_url and allowed domain column. See below:

            ...

            ANSWER

            Answered 2020-Apr-28 at 04:34

            You cannot assign allowed_domain for each link in start_urls

            You will have to filter urls inside process_request method of DownloaderMiddleware

            Here is your Spider code

            Source https://stackoverflow.com/questions/61455543

            QUESTION

            Android Studio - Parsing JSON from Google Places Details API Phone Number giving null on first run
            Asked 2020-Apr-21 at 23:33

            Bit of a strange issue here. Currently I have an activity which gets the names and place ids of all the taxi companies using Google Places Search API and places them into a list view. Then when the item is clicked it will take the place id and run the Places Details API to fetch the phone number.

            Currently I am running into the issue where the first time the item is clicked in the list view the JSON parser will return a NULL and the phone will dial a number like 6855 or 685-5. If you go back and click on the same item or another item then the phone number will fetch correctly.

            In the activity I am running 2 JSON parsers however they run at different times.

            onCreate:

            ...

            ANSWER

            Answered 2020-Apr-21 at 23:33

            It is because, your number is null by the time you return "number". You are not waiting until the api call is complete. It is better you implement a callback when you get the response to perform specific action.

            Source https://stackoverflow.com/questions/61345141

            QUESTION

            Error: control may reach end of non-void function c programming
            Asked 2020-Apr-16 at 18:06
            void *returnMin(PQueue q){
              if (q.list == NULL){
                printf("List is empty.\n");
              } else if (q.list->head == NULL){
                printf("List is empty.\n");
              } else {
                return q.list->head;
              }
            }
            
            ...

            ANSWER

            Answered 2020-Apr-16 at 18:06

            Your function returns a pointer. Since the function returns something, and that something is likely being used somewhere else in your code, it must return a value in any possible case. Your function however does not do this, since only the last branch has a return statement. If you somehow enter if (q.list == NULL) you have no return statement to execute.

            To fix this, return something meaningful (NULL is a good choice to indicate an error):

            Source https://stackoverflow.com/questions/61256121

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

            Vulnerabilities

            No vulnerabilities reported

            Install pqueue

            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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