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peek | Take a peek into your Rails applications | iOS library

 by   peek Ruby Version: v1.1.0 License: MIT

 by   peek Ruby Version: v1.1.0 License: MIT

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kandi X-RAY | peek Summary

peek is a Ruby library typically used in Mobile, iOS applications. peek has no vulnerabilities, it has a Permissive License and it has medium support. However peek has 4 bugs. You can download it from GitHub.
Take a peek into your Rails application. This is a profiling tool originally built at GitHub to help us get an insight into our application. Now, we have extracted this into Peek, so that other Rails applications can experience the same benefit. Peek puts a little bar on top of your application to show you all sorts of helpful information about your application. From the screenshot above, you can see that Peek provides information about database queries, cache, Resque workers and more. However, this is only part of Peek's beauty. The true beauty of Peek lies in the fact that it is an extensible platform. If there are some performance metrics that you need but are not available on Peek, you can find them in the list of available Peek Views and integrate them into Peek. Even if you do not find what you want on Peek Views, you can always create your own.
Support
Support
Quality
Quality
Security
Security
License
License
Reuse
Reuse

kandi-support Support

  • peek has a medium active ecosystem.
  • It has 3145 star(s) with 151 fork(s). There are 59 watchers for this library.
  • It had no major release in the last 12 months.
  • There are 11 open issues and 36 have been closed. On average issues are closed in 148 days. There are 4 open pull requests and 0 closed requests.
  • It has a neutral sentiment in the developer community.
  • The latest version of peek is v1.1.0
peek Support
Best in #iOS
Average in #iOS
peek Support
Best in #iOS
Average in #iOS

quality kandi Quality

  • peek has 4 bugs (0 blocker, 0 critical, 4 major, 0 minor) and 0 code smells.
peek Quality
Best in #iOS
Average in #iOS
peek Quality
Best in #iOS
Average in #iOS

securitySecurity

  • peek has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.
  • peek code analysis shows 0 unresolved vulnerabilities.
  • There are 0 security hotspots that need review.
peek Security
Best in #iOS
Average in #iOS
peek Security
Best in #iOS
Average in #iOS

license License

  • peek is licensed under the MIT License. This license is Permissive.
  • Permissive licenses have the least restrictions, and you can use them in most projects.
peek License
Best in #iOS
Average in #iOS
peek License
Best in #iOS
Average in #iOS

buildReuse

  • peek releases are available to install and integrate.
  • Installation instructions, examples and code snippets are available.
  • peek saves you 332 person hours of effort in developing the same functionality from scratch.
  • It has 797 lines of code, 52 functions and 47 files.
  • It has low code complexity. Code complexity directly impacts maintainability of the code.
peek Reuse
Best in #iOS
Average in #iOS
peek Reuse
Best in #iOS
Average in #iOS
Top functions reviewed by kandi - BETA

kandi has reviewed peek and discovered the below as its top functions. This is intended to give you an instant insight into peek implemented functionality, and help decide if they suit your requirements.

  • Renders the request
    • Redirect to access to next request
      • Returns true if the peer is enabled

        Get all kandi verified functions for this library.

        Get all kandi verified functions for this library.

        peek Key Features

        Take a peek into your Rails applications.

        Installation

        copy iconCopydownload iconDownload
        gem 'peek'
        

        Usage

        copy iconCopydownload iconDownload
        Some::Application.routes.draw do
          mount Peek::Railtie => '/peek'
          root to: 'home#show'
        end
        

        Configuring the default adapter

        copy iconCopydownload iconDownload
        Peeked::Application.configure do
          # ...
        
          # Redis with no options
          config.peek.adapter = :redis
        
          # Redis with options
          config.peek.adapter = :redis, {
            client: Redis.new,
            expires_in: 60 * 30 # => 30 minutes in seconds
          }
        
          # Memcache with no options
          config.peek.adapter = :memcache
        
          # Memcache with options
          config.peek.adapter = :memcache, {
            client: Dalli::Client.new,
            expires_in: 60 * 30 # => 30 minutes in seconds
          }
        
          # Elasticsearch with no options
          config.peek.adapter = :elasticsearch
        
          # Elasticsearch with options
          config.peek.adapter = :elasticsearch, {
            client: Elasticsearch::Client.new,
            expires_in: 60 * 30, # => 30 minutes in seconds
            index: 'peek_requests_index',
            type: 'peek_request'
          }
        
          # ...
        end
        

        Customizing the bar

        copy iconCopydownload iconDownload
        #peek {
          position: fixed;
          bottom: 0;
          left: 0;
          right: 0;
          z-index: 999;
        }
        

        Access Control

        copy iconCopydownload iconDownload
        class ApplicationController < ActionController::Base
          def peek_enabled?
            current_user.staff?
          end
        end
        

        I can't understand why does my pthread freeze

        copy iconCopydownload iconDownload
        template<class T>
        T SafeQueue<T>::front(){
            pthread_mutex_lock(&_mutex);
            T temp;
            while(!get(temp)){
                pthread_cond_wait(&_condition, &_mutex);
            }
            pthread_mutex_unlock(&_mutex);
            return temp;
        }
        
        template<class T>
        bool SafeQueue<T>::get(T &x){
            bool result = false;
            pthread_mutex_lock(&_mutex);
            if(!_data.empty()){
                result = true;
                x = _data.front();
                pthread_cond_signal(&_condition);
            }
            pthread_mutex_unlock(&_mutex);
            return result;
        }
        
        template<class T>
        T SafeQueue<T>::front(){
            pthread_mutex_lock(&_mutex);
            T temp;
            while(!get(temp)){
                pthread_cond_wait(&_condition, &_mutex);
            }
            pthread_mutex_unlock(&_mutex);
            return temp;
        }
        
        template<class T>
        bool SafeQueue<T>::get(T &x){
            bool result = false;
            pthread_mutex_lock(&_mutex);
            if(!_data.empty()){
                result = true;
                x = _data.front();
                pthread_cond_signal(&_condition);
            }
            pthread_mutex_unlock(&_mutex);
            return result;
        }
        

        How to add XML elements from List into XMLEventWriter? Append XML to already created XMLEventWriter/XmlStreamWriter

        copy iconCopydownload iconDownload
        xmlEventWriter.add(events.createEndDocument());
        xmlEventWriter.add(events.createEndDocument());
        
        xmlEventWriter.add(events.createEndElement(new QName("fragments"), null));
        xmlEventWriter.add(events.createEndElement(new QName("root"), null));
        xmlEventWriter.add(events.createEndDocument());
        
        xer = new EventReaderDelegate(xer) {
            @Override
            public boolean hasNext() {
                if (! super.hasNext())
                    return false;
                try {
                    return ! super.peek().isEndDocument();
                } catch (@SuppressWarnings("unused") XMLStreamException ignored) {
                    return true;
                }
            }
        };
        
        xmlEventWriter.add(events.createEndDocument());
        xmlEventWriter.add(events.createEndDocument());
        
        xmlEventWriter.add(events.createEndElement(new QName("fragments"), null));
        xmlEventWriter.add(events.createEndElement(new QName("root"), null));
        xmlEventWriter.add(events.createEndDocument());
        
        xer = new EventReaderDelegate(xer) {
            @Override
            public boolean hasNext() {
                if (! super.hasNext())
                    return false;
                try {
                    return ! super.peek().isEndDocument();
                } catch (@SuppressWarnings("unused") XMLStreamException ignored) {
                    return true;
                }
            }
        };
        
        xmlEventWriter.add(events.createEndDocument());
        xmlEventWriter.add(events.createEndDocument());
        
        xmlEventWriter.add(events.createEndElement(new QName("fragments"), null));
        xmlEventWriter.add(events.createEndElement(new QName("root"), null));
        xmlEventWriter.add(events.createEndDocument());
        
        xer = new EventReaderDelegate(xer) {
            @Override
            public boolean hasNext() {
                if (! super.hasNext())
                    return false;
                try {
                    return ! super.peek().isEndDocument();
                } catch (@SuppressWarnings("unused") XMLStreamException ignored) {
                    return true;
                }
            }
        };
        

        C# How to capture input from pipeline from continuous stream source

        copy iconCopydownload iconDownload
        static void Main(string[] args) 
        {
            Console.SetIn(new StreamReader(Console.OpenStandardInput(8192))); // This will allow input >256 chars
        
            string input;
            while ( (input= Console.ReadLine()) != null) 
            {
                Log(input);
            }
        }
        
        static void Log(string data)
        {
            string msg = $"Data read was {data}";
            Console.WriteLine(msg);
            File.AppendAllText("C:\YourPath", msg);
        }
        

        Doesn't Stream.parallel() update the characteristics of spliterator?

        copy iconCopydownload iconDownload
            return isParallel()
                   ? terminalOp.evaluateParallel(this, sourceSpliterator(terminalOp.getOpFlags()))
                   : terminalOp.evaluateSequential(this, sourceSpliterator(terminalOp.getOpFlags()));
        
        @Override
        public Sink<Integer> opWrapSink(int flags, Sink sink) {
            Objects.requireNonNull(sink);
        
            if (StreamOpFlag.SORTED.isKnown(flags))
                return sink;
            else if (StreamOpFlag.SIZED.isKnown(flags))
                return new SizedIntSortingSink(sink);
            else
                return new IntSortingSink(sink);
        }
        
        @Override
        public <P_IN> Node<Integer> opEvaluateParallel(PipelineHelper<Integer> helper,
                                                       Spliterator<P_IN> spliterator,
                                                       IntFunction<Integer[]> generator) {
            if (StreamOpFlag.SORTED.isKnown(helper.getStreamAndOpFlags())) {
                return helper.evaluate(spliterator, false, generator);
            }
            else {
                Node.OfInt n = (Node.OfInt) helper.evaluate(spliterator, true, generator);
        
                int[] content = n.asPrimitiveArray();
                Arrays.parallelSort(content);
        
                return Nodes.node(content);
            }
        }
        
            return isParallel()
                   ? terminalOp.evaluateParallel(this, sourceSpliterator(terminalOp.getOpFlags()))
                   : terminalOp.evaluateSequential(this, sourceSpliterator(terminalOp.getOpFlags()));
        
        @Override
        public Sink<Integer> opWrapSink(int flags, Sink sink) {
            Objects.requireNonNull(sink);
        
            if (StreamOpFlag.SORTED.isKnown(flags))
                return sink;
            else if (StreamOpFlag.SIZED.isKnown(flags))
                return new SizedIntSortingSink(sink);
            else
                return new IntSortingSink(sink);
        }
        
        @Override
        public <P_IN> Node<Integer> opEvaluateParallel(PipelineHelper<Integer> helper,
                                                       Spliterator<P_IN> spliterator,
                                                       IntFunction<Integer[]> generator) {
            if (StreamOpFlag.SORTED.isKnown(helper.getStreamAndOpFlags())) {
                return helper.evaluate(spliterator, false, generator);
            }
            else {
                Node.OfInt n = (Node.OfInt) helper.evaluate(spliterator, true, generator);
        
                int[] content = n.asPrimitiveArray();
                Arrays.parallelSort(content);
        
                return Nodes.node(content);
            }
        }
        
        System.out.println(
            IntStream.of(1,2,3)
                     .parallel()
                     .map(x -> {System.out.println(x * 2); return x * 2;})
                     .boxed()
                     .collect(Collectors.toList()));
        
        Spliterator<Integer> spliterator =
        IntStream.of(5, 4, 3, 2, 1, 5, 6, 7, 8)
                 .parallel()
                 .boxed()
                 .sorted()
                 .spliterator()
                 .trySplit(); // trySplit is invoked internally on parallel
        
        spliterator.forEachRemaining(System.out::println);
        
        Spliterator<Integer> spliterator =
        IntStream.of(5, 4, 3, 2, 1, 5, 6, 7, 8)
                 .parallel()
                 .boxed()
                 .sorted()
                 .spliterator()
                 .trySplit()
                 .trySplit()
                 .trySplit();
        
        spliterator.forEachRemaining(System.out::println);
        
        System.out.println(
            IntStream.of(1,2,3)
                     .parallel()
                     .map(x -> {System.out.println(x * 2); return x * 2;})
                     .boxed()
                     .collect(Collectors.toList()));
        
        Spliterator<Integer> spliterator =
        IntStream.of(5, 4, 3, 2, 1, 5, 6, 7, 8)
                 .parallel()
                 .boxed()
                 .sorted()
                 .spliterator()
                 .trySplit(); // trySplit is invoked internally on parallel
        
        spliterator.forEachRemaining(System.out::println);
        
        Spliterator<Integer> spliterator =
        IntStream.of(5, 4, 3, 2, 1, 5, 6, 7, 8)
                 .parallel()
                 .boxed()
                 .sorted()
                 .spliterator()
                 .trySplit()
                 .trySplit()
                 .trySplit();
        
        spliterator.forEachRemaining(System.out::println);
        
        System.out.println(
            IntStream.of(1,2,3)
                     .parallel()
                     .map(x -> {System.out.println(x * 2); return x * 2;})
                     .boxed()
                     .collect(Collectors.toList()));
        
        Spliterator<Integer> spliterator =
        IntStream.of(5, 4, 3, 2, 1, 5, 6, 7, 8)
                 .parallel()
                 .boxed()
                 .sorted()
                 .spliterator()
                 .trySplit(); // trySplit is invoked internally on parallel
        
        spliterator.forEachRemaining(System.out::println);
        
        Spliterator<Integer> spliterator =
        IntStream.of(5, 4, 3, 2, 1, 5, 6, 7, 8)
                 .parallel()
                 .boxed()
                 .sorted()
                 .spliterator()
                 .trySplit()
                 .trySplit()
                 .trySplit();
        
        spliterator.forEachRemaining(System.out::println);
        

        ActiveMQ/STOMP Clear Schedule Messages Pointed To Destination

        copy iconCopydownload iconDownload
        MessageProducer producer = session.createProducer(management);
        Message request = session.createMessage();
        request.setStringProperty(ScheduledMessage.AMQ_SCHEDULER_ACTION, ScheduledMessage.AMQ_SCHEDULER_ACTION_REMOVEALL);
        request.setStringProperty(ScheduledMessage.AMQ_SCHEDULER_ACTION_START_TIME, Long.toString(start));
        request.setStringProperty(ScheduledMessage.AMQ_SCHEDULER_ACTION_END_TIME, Long.toString(end));
        producer.send(request);
        

        Is there a way to store the XMLStreamReader values temporarily within another XMLStreamReader for validations?

        copy iconCopydownload iconDownload
        //Store the XMLStreamReader values within the buffer
        final MutableXMLStreamBuffer buffer = new MutableXMLStreamBuffer();
        buffer.createFromXMLStreamReader(xmlStreamReader);
        
        buffer.readAsXMLStreamReader()
        
        //Store the XMLStreamReader values within the buffer
        final MutableXMLStreamBuffer buffer = new MutableXMLStreamBuffer();
        buffer.createFromXMLStreamReader(xmlStreamReader);
        
        buffer.readAsXMLStreamReader()
        

        Migrating program code written in C++ to C# - What's the equivalent of `set&lt;ii&gt; ::iterator`?

        copy iconCopydownload iconDownload
                set<ii> ::iterator it = b->S.end();
                it--; // last element of set
                int x = it->second; // index of worst scored student 
                b.S.Remove(it); // delete worst scored student
        
         var item = b.S.Last(); // Get last item, or throws if empty
         var b.S.Remove(item); // remove item
        
                set<ii> ::iterator it = b->S.end();
                it--; // last element of set
                int x = it->second; // index of worst scored student 
                b.S.Remove(it); // delete worst scored student
        
         var item = b.S.Last(); // Get last item, or throws if empty
         var b.S.Remove(item); // remove item
        

        Using System.Xml.XmlReader, parse the DTD if present but don't fail if absent

        copy iconCopydownload iconDownload
        XmlReaderSettings settings = new XmlReaderSettings();
        settings.ProhibitDtd = false;
        settings.MaxCharactersFromEntities = 1024;
        settings.XmlResolver = new MyXmlResolver(new Uri(source.getSystemId()));
        xmlReader = XmlReader.Create(inputStream, settings);
        

        Python is not calling fucntions properly

        copy iconCopydownload iconDownload
        def game(xy, y):
            x=[]
            i = 0
            letter = ''
            x = stringmanipulator(xy, y)
            xy = xy.lower()
            # os.system('cls')
            
            for index in range(len(x)):
                
                if(x[index] == '_'):
                    
                    while(letter != x[index]):
                        _= os.system('cls')
                        hangman(i)
                        
                        for char in range(len(x)):
                            print(x[char], end=' ')
                        print("\n")
                     
                        letter = input("Enter the letter in the first blank: ")
                        print(letter+str(i))
                        if(letter == xy[index]):
                            print("complement")
                            x[index] = letter
                     
                        else:
                            printdis()
                            i+=1
        
                        input("Press any key to continue: ")
        
        complements = [
            "well done!!",
            "keep going!!",
            "YOU can save him!!",
            "You are the hero no one wanted but everyone deserves.",
            "Genius kid.",
            "You are Smart, not kidding.",
            "You are one who will destroy my carrier using your intellect.",
            "The most kind hearted person I have ever seen till now. Yes I am talking about you",
            "You nailed  it.",
            "AND I thought the game was hard.",
            "I will find more difficult words to challenge you with.",
            "How about you put another life on risk after this round."
        ]
        
        
        def complement() -> str:
            return "\n" + complements[int(random.random() * len(complements))] + "\n"
        
            
        
        sick_burns = [
            "Fool",
            "You will end up killing the fool and then I will hang you next.",
            "What a piece of shit you are.",
            "Hey disgrace to humanity.",
            "Don't cry after the man is dead. You killed him, I gave you a chance to save him.",
            "Dumbass!!",
            "You know what it was my mistake to let such an idiot play."
            "This is your last game. I don't want fools playing this game."
            "I see you are already crying."
            "Even the guy who's life is line is laughing at your  stupidity."
            "My 120 years old grandma has a sharper brain than yours."
            "Get lost, YOU useless, moronic, unworthy pile of garbage."
        ]
        
        
        def dis() -> str:
            return "\n" + sick_burns[int(random.random() * len(sick_burns))] + "\n"
        
         def game(xy, y):
            x=[]
            i = 0
            letter = ''
            feedback = ''
            x = stringmanipulator(xy, y)
            xy = xy.lower()
            # os.system('cls')
            
            for index in range(len(x)):
                
                if(x[index] == '_'):
                    
                    while(letter != x[index]):
                        _= os.system('cls')
                        hangman(i)
                        
                        for char in range(len(x)):
                            print(x[char], end=' ')
                        print("\n")
                     
                        print(feedback) # prints feedback of the previous loop
        
                        letter = input("Enter the letter in the first blank: ")
                        print(letter+str(i))
                        if(letter == xy[index]):
                            feedback = complement()
                            x[index] = letter
                     
                        else:
                            feedback = dis()
                            i += 1
        
        def game(xy, y):
            x=[]
            i = 0
            letter = ''
            x = stringmanipulator(xy, y)
            xy = xy.lower()
            # os.system('cls')
            
            for index in range(len(x)):
                
                if(x[index] == '_'):
                    
                    while(letter != x[index]):
                        _= os.system('cls')
                        hangman(i)
                        
                        for char in range(len(x)):
                            print(x[char], end=' ')
                        print("\n")
                     
                        letter = input("Enter the letter in the first blank: ")
                        print(letter+str(i))
                        if(letter == xy[index]):
                            print("complement")
                            x[index] = letter
                     
                        else:
                            printdis()
                            i+=1
        
                        input("Press any key to continue: ")
        
        complements = [
            "well done!!",
            "keep going!!",
            "YOU can save him!!",
            "You are the hero no one wanted but everyone deserves.",
            "Genius kid.",
            "You are Smart, not kidding.",
            "You are one who will destroy my carrier using your intellect.",
            "The most kind hearted person I have ever seen till now. Yes I am talking about you",
            "You nailed  it.",
            "AND I thought the game was hard.",
            "I will find more difficult words to challenge you with.",
            "How about you put another life on risk after this round."
        ]
        
        
        def complement() -> str:
            return "\n" + complements[int(random.random() * len(complements))] + "\n"
        
            
        
        sick_burns = [
            "Fool",
            "You will end up killing the fool and then I will hang you next.",
            "What a piece of shit you are.",
            "Hey disgrace to humanity.",
            "Don't cry after the man is dead. You killed him, I gave you a chance to save him.",
            "Dumbass!!",
            "You know what it was my mistake to let such an idiot play."
            "This is your last game. I don't want fools playing this game."
            "I see you are already crying."
            "Even the guy who's life is line is laughing at your  stupidity."
            "My 120 years old grandma has a sharper brain than yours."
            "Get lost, YOU useless, moronic, unworthy pile of garbage."
        ]
        
        
        def dis() -> str:
            return "\n" + sick_burns[int(random.random() * len(sick_burns))] + "\n"
        
         def game(xy, y):
            x=[]
            i = 0
            letter = ''
            feedback = ''
            x = stringmanipulator(xy, y)
            xy = xy.lower()
            # os.system('cls')
            
            for index in range(len(x)):
                
                if(x[index] == '_'):
                    
                    while(letter != x[index]):
                        _= os.system('cls')
                        hangman(i)
                        
                        for char in range(len(x)):
                            print(x[char], end=' ')
                        print("\n")
                     
                        print(feedback) # prints feedback of the previous loop
        
                        letter = input("Enter the letter in the first blank: ")
                        print(letter+str(i))
                        if(letter == xy[index]):
                            feedback = complement()
                            x[index] = letter
                     
                        else:
                            feedback = dis()
                            i += 1
        
        def game(xy, y):
            x=[]
            i = 0
            letter = ''
            x = stringmanipulator(xy, y)
            xy = xy.lower()
            # os.system('cls')
            
            for index in range(len(x)):
                
                if(x[index] == '_'):
                    
                    while(letter != x[index]):
                        _= os.system('cls')
                        hangman(i)
                        
                        for char in range(len(x)):
                            print(x[char], end=' ')
                        print("\n")
                     
                        letter = input("Enter the letter in the first blank: ")
                        print(letter+str(i))
                        if(letter == xy[index]):
                            print("complement")
                            x[index] = letter
                     
                        else:
                            printdis()
                            i+=1
        
                        input("Press any key to continue: ")
        
        complements = [
            "well done!!",
            "keep going!!",
            "YOU can save him!!",
            "You are the hero no one wanted but everyone deserves.",
            "Genius kid.",
            "You are Smart, not kidding.",
            "You are one who will destroy my carrier using your intellect.",
            "The most kind hearted person I have ever seen till now. Yes I am talking about you",
            "You nailed  it.",
            "AND I thought the game was hard.",
            "I will find more difficult words to challenge you with.",
            "How about you put another life on risk after this round."
        ]
        
        
        def complement() -> str:
            return "\n" + complements[int(random.random() * len(complements))] + "\n"
        
            
        
        sick_burns = [
            "Fool",
            "You will end up killing the fool and then I will hang you next.",
            "What a piece of shit you are.",
            "Hey disgrace to humanity.",
            "Don't cry after the man is dead. You killed him, I gave you a chance to save him.",
            "Dumbass!!",
            "You know what it was my mistake to let such an idiot play."
            "This is your last game. I don't want fools playing this game."
            "I see you are already crying."
            "Even the guy who's life is line is laughing at your  stupidity."
            "My 120 years old grandma has a sharper brain than yours."
            "Get lost, YOU useless, moronic, unworthy pile of garbage."
        ]
        
        
        def dis() -> str:
            return "\n" + sick_burns[int(random.random() * len(sick_burns))] + "\n"
        
         def game(xy, y):
            x=[]
            i = 0
            letter = ''
            feedback = ''
            x = stringmanipulator(xy, y)
            xy = xy.lower()
            # os.system('cls')
            
            for index in range(len(x)):
                
                if(x[index] == '_'):
                    
                    while(letter != x[index]):
                        _= os.system('cls')
                        hangman(i)
                        
                        for char in range(len(x)):
                            print(x[char], end=' ')
                        print("\n")
                     
                        print(feedback) # prints feedback of the previous loop
        
                        letter = input("Enter the letter in the first blank: ")
                        print(letter+str(i))
                        if(letter == xy[index]):
                            feedback = complement()
                            x[index] = letter
                     
                        else:
                            feedback = dis()
                            i += 1
        
        def game(xy, y):
            x=[]
            i = 0
            letter = ''
            x = stringmanipulator(xy, y)
            xy = xy.lower()
            # os.system('cls')
            
            for index in range(len(x)):
                
                if(x[index] == '_'):
                    
                    while(letter != x[index]):
                        _= os.system('cls')
                        hangman(i)
                        
                        for char in range(len(x)):
                            print(x[char], end=' ')
                        print("\n")
                     
                        letter = input("Enter the letter in the first blank: ")
                        print(letter+str(i))
                        if(letter == xy[index]):
                            print("complement")
                            x[index] = letter
                     
                        else:
                            printdis()
                            i+=1
        
                        input("Press any key to continue: ")
        
        complements = [
            "well done!!",
            "keep going!!",
            "YOU can save him!!",
            "You are the hero no one wanted but everyone deserves.",
            "Genius kid.",
            "You are Smart, not kidding.",
            "You are one who will destroy my carrier using your intellect.",
            "The most kind hearted person I have ever seen till now. Yes I am talking about you",
            "You nailed  it.",
            "AND I thought the game was hard.",
            "I will find more difficult words to challenge you with.",
            "How about you put another life on risk after this round."
        ]
        
        
        def complement() -> str:
            return "\n" + complements[int(random.random() * len(complements))] + "\n"
        
            
        
        sick_burns = [
            "Fool",
            "You will end up killing the fool and then I will hang you next.",
            "What a piece of shit you are.",
            "Hey disgrace to humanity.",
            "Don't cry after the man is dead. You killed him, I gave you a chance to save him.",
            "Dumbass!!",
            "You know what it was my mistake to let such an idiot play."
            "This is your last game. I don't want fools playing this game."
            "I see you are already crying."
            "Even the guy who's life is line is laughing at your  stupidity."
            "My 120 years old grandma has a sharper brain than yours."
            "Get lost, YOU useless, moronic, unworthy pile of garbage."
        ]
        
        
        def dis() -> str:
            return "\n" + sick_burns[int(random.random() * len(sick_burns))] + "\n"
        
         def game(xy, y):
            x=[]
            i = 0
            letter = ''
            feedback = ''
            x = stringmanipulator(xy, y)
            xy = xy.lower()
            # os.system('cls')
            
            for index in range(len(x)):
                
                if(x[index] == '_'):
                    
                    while(letter != x[index]):
                        _= os.system('cls')
                        hangman(i)
                        
                        for char in range(len(x)):
                            print(x[char], end=' ')
                        print("\n")
                     
                        print(feedback) # prints feedback of the previous loop
        
                        letter = input("Enter the letter in the first blank: ")
                        print(letter+str(i))
                        if(letter == xy[index]):
                            feedback = complement()
                            x[index] = letter
                     
                        else:
                            feedback = dis()
                            i += 1
        

        Unexpected behaviour java priority queue. Object added once but polled out twice. How could it be possible?

        copy iconCopydownload iconDownload
        public int compareTo(Pair p) {
             if (this.a == p.a) {
                 if (this.b == p.b) return this.c - p.c;
                 return this.b = p.b;
             }
             return this.a - p.a;
         }
        
        return this.b = p.b;
        
        if (this.c == p.c) {
            return 0;
        } else if (this.c < p.c) {
            return -1;
        } else {
            return +1;
        }
        
        return (this.c == p.c) ? 0 : ((this.c < p.c) ? -1 : +1);
        
        return Integer.compare(this.c, p.c);
        
        class Pair implements Comparable<Pair> {
            final int a, b, c;
        
            Pair(int x, int y, int z) {
                a = x;
                b = y;
                c = z;
            }
        
            public int compareTo(Pair p) {
                if (this.a == p.a) {
                    if (this.b == p.b) {
                        return Integer.compare(this.c, p.c);
                    } else {
                        return Integer.compare(this.b, p.b);
                    }
                } else {
                    return Integer.compare(this.a, p.a);
                }
            }
        }
        
        public int compareTo(Pair p) {
             if (this.a == p.a) {
                 if (this.b == p.b) return this.c - p.c;
                 return this.b = p.b;
             }
             return this.a - p.a;
         }
        
        return this.b = p.b;
        
        if (this.c == p.c) {
            return 0;
        } else if (this.c < p.c) {
            return -1;
        } else {
            return +1;
        }
        
        return (this.c == p.c) ? 0 : ((this.c < p.c) ? -1 : +1);
        
        return Integer.compare(this.c, p.c);
        
        class Pair implements Comparable<Pair> {
            final int a, b, c;
        
            Pair(int x, int y, int z) {
                a = x;
                b = y;
                c = z;
            }
        
            public int compareTo(Pair p) {
                if (this.a == p.a) {
                    if (this.b == p.b) {
                        return Integer.compare(this.c, p.c);
                    } else {
                        return Integer.compare(this.b, p.b);
                    }
                } else {
                    return Integer.compare(this.a, p.a);
                }
            }
        }
        
        public int compareTo(Pair p) {
             if (this.a == p.a) {
                 if (this.b == p.b) return this.c - p.c;
                 return this.b = p.b;
             }
             return this.a - p.a;
         }
        
        return this.b = p.b;
        
        if (this.c == p.c) {
            return 0;
        } else if (this.c < p.c) {
            return -1;
        } else {
            return +1;
        }
        
        return (this.c == p.c) ? 0 : ((this.c < p.c) ? -1 : +1);
        
        return Integer.compare(this.c, p.c);
        
        class Pair implements Comparable<Pair> {
            final int a, b, c;
        
            Pair(int x, int y, int z) {
                a = x;
                b = y;
                c = z;
            }
        
            public int compareTo(Pair p) {
                if (this.a == p.a) {
                    if (this.b == p.b) {
                        return Integer.compare(this.c, p.c);
                    } else {
                        return Integer.compare(this.b, p.b);
                    }
                } else {
                    return Integer.compare(this.a, p.a);
                }
            }
        }
        
        public int compareTo(Pair p) {
             if (this.a == p.a) {
                 if (this.b == p.b) return this.c - p.c;
                 return this.b = p.b;
             }
             return this.a - p.a;
         }
        
        return this.b = p.b;
        
        if (this.c == p.c) {
            return 0;
        } else if (this.c < p.c) {
            return -1;
        } else {
            return +1;
        }
        
        return (this.c == p.c) ? 0 : ((this.c < p.c) ? -1 : +1);
        
        return Integer.compare(this.c, p.c);
        
        class Pair implements Comparable<Pair> {
            final int a, b, c;
        
            Pair(int x, int y, int z) {
                a = x;
                b = y;
                c = z;
            }
        
            public int compareTo(Pair p) {
                if (this.a == p.a) {
                    if (this.b == p.b) {
                        return Integer.compare(this.c, p.c);
                    } else {
                        return Integer.compare(this.b, p.b);
                    }
                } else {
                    return Integer.compare(this.a, p.a);
                }
            }
        }
        
        public int compareTo(Pair p) {
             if (this.a == p.a) {
                 if (this.b == p.b) return this.c - p.c;
                 return this.b = p.b;
             }
             return this.a - p.a;
         }
        
        return this.b = p.b;
        
        if (this.c == p.c) {
            return 0;
        } else if (this.c < p.c) {
            return -1;
        } else {
            return +1;
        }
        
        return (this.c == p.c) ? 0 : ((this.c < p.c) ? -1 : +1);
        
        return Integer.compare(this.c, p.c);
        
        class Pair implements Comparable<Pair> {
            final int a, b, c;
        
            Pair(int x, int y, int z) {
                a = x;
                b = y;
                c = z;
            }
        
            public int compareTo(Pair p) {
                if (this.a == p.a) {
                    if (this.b == p.b) {
                        return Integer.compare(this.c, p.c);
                    } else {
                        return Integer.compare(this.b, p.b);
                    }
                } else {
                    return Integer.compare(this.a, p.a);
                }
            }
        }
        
        public int compareTo(Pair p) {
             if (this.a == p.a) {
                 if (this.b == p.b) return this.c - p.c;
                 return this.b = p.b;
             }
             return this.a - p.a;
         }
        
        return this.b = p.b;
        
        if (this.c == p.c) {
            return 0;
        } else if (this.c < p.c) {
            return -1;
        } else {
            return +1;
        }
        
        return (this.c == p.c) ? 0 : ((this.c < p.c) ? -1 : +1);
        
        return Integer.compare(this.c, p.c);
        
        class Pair implements Comparable<Pair> {
            final int a, b, c;
        
            Pair(int x, int y, int z) {
                a = x;
                b = y;
                c = z;
            }
        
            public int compareTo(Pair p) {
                if (this.a == p.a) {
                    if (this.b == p.b) {
                        return Integer.compare(this.c, p.c);
                    } else {
                        return Integer.compare(this.b, p.b);
                    }
                } else {
                    return Integer.compare(this.a, p.a);
                }
            }
        }
        

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        QUESTION

        I can't understand why does my pthread freeze

        Asked 2021-Jun-15 at 11:06

        I was trying to create a thread safe queue, but something went wrong. I can't understand why does my thread freeze. Expected: 1 2 3, but i get nothing (everything just freezes)

        I guess the problem is misuse of condition variable in front (pop) and get (peek) methods, but I can't find my mistake. Could you please point out my mistake and explain what the mistake is?

        template<class T>
        class SafeQueue {
        private:
            std::queue<T> _data;
            pthread_mutex_t _mutex;
            pthread_cond_t _condition;
        public:
            SafeQueue();
            ~SafeQueue();
            void push(const T &x);
            T front();
            bool peek(T &x);
            bool get(T &x);
        };
        
        template<class T>
        SafeQueue<T>::SafeQueue(){
            pthread_mutex_init(&_mutex, NULL);
            pthread_cond_init(&_condition, NULL);
        }
        
        template<class T>
        SafeQueue<T>::~SafeQueue(){
            pthread_mutex_destroy(&_mutex);
            pthread_cond_destroy(&_condition);
        }
        
        template<class T>
        void SafeQueue<T>::push(const T &x){
            pthread_mutex_lock(&_mutex);
            _data.push(x);
            pthread_mutex_unlock(&_mutex);
        }
        
        template<class T>
        T SafeQueue<T>::front(){
            pthread_mutex_lock(&_mutex);
            T temp;
            while(!get(temp)){
                pthread_cond_wait(&_condition, &_mutex);
            }
            pthread_mutex_unlock(&_mutex);
            return temp;
        }
        
        template<class T>
        bool SafeQueue<T>::get(T &x){
            bool result = false;
            pthread_mutex_lock(&_mutex);
            if(!_data.empty()){
                result = true;
                x = _data.front();
                pthread_cond_signal(&_condition);
            }
            pthread_mutex_unlock(&_mutex);
            return result;
        }
        
        template<class T>
        void SafeQueue<T>::pop(){
            pthread_mutex_lock(&_mutex);
            T temp;
            while(!peek(temp)){
                pthread_cond_wait(&_condition, &_mutex);
            }
            pthread_mutex_unlock(&_mutex);
        }
        
        template<class T>
        bool SafeQueue<T>::peek(T &x){
            bool result = false;
            pthread_mutex_lock(&_mutex);
            if(!_data.empty()){
                result = true;
                x = _data.front();
                _data.pop();
                pthread_cond_signal(&_condition);
            }
            pthread_mutex_unlock(&_mutex);
            return result;
        }
        
        

        main.cpp

        int main(){
            SafeQueue<int> q;
            q.push(1);
            q.push(2);
            q.push(3);
            cout << q.front() << endl; q.pop();
            cout << q.front() << endl; q.pop();
            cout << q.front() << endl; q.pop();
        
            return 0;
        }
        

        ANSWER

        Answered 2021-Jun-15 at 11:06

        This is your front :

        template<class T>
        T SafeQueue<T>::front(){
            pthread_mutex_lock(&_mutex);
            T temp;
            while(!get(temp)){
                pthread_cond_wait(&_condition, &_mutex);
            }
            pthread_mutex_unlock(&_mutex);
            return temp;
        }
        

        It locks the mutex, does some stuff, releases the mutex. As part of "some stuff" it calls get(temp).

        Your get is:

        template<class T>
        bool SafeQueue<T>::get(T &x){
            bool result = false;
            pthread_mutex_lock(&_mutex);
            if(!_data.empty()){
                result = true;
                x = _data.front();
                pthread_cond_signal(&_condition);
            }
            pthread_mutex_unlock(&_mutex);
            return result;
        }
        

        It tries to lock the mutex....

        From the docs:

        If the mutex is already locked, the calling thread shall block until the mutex becomes available.

        The mutex never becomes available, because it is locked in the caller (front) and will only be released when get returns, but get does never return.

        One way to avoid such deadlock is to use private methods that do the actual work but don't use the mutex. Only lock the mutex in public methods. Then you only need to make sure to never call a public method from another public method. Alternatively use a recursive mutex.

        In any case I suggest you to use std::thread and its relatives (std::mutex and others).

        Source https://stackoverflow.com/questions/67984761

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

        Vulnerabilities

        No vulnerabilities reported

        Install peek

        Add this line to your application's Gemfile:.

        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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