Found a total of 10000 related content
How to implement a thread-safe queue in C
Article Introduction：The core of implementing thread-safe queues is to use mutex locks and condition variables to protect shared data. The answer is to combine std::queue, std::mutex and std::condition_variable to implement thread-safe incoming and dequeuing operations. The push method locks and notifies the waiting thread. The pop method waits when the queue is empty. Try_pop provides non-blocking popups. The empty and size methods support constant calls. The entire design uses RAII to ensure the secure management of locks and improves performance through move semantics. It is suitable for most multi-threaded scenarios.
2025-08-24
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689
How do abstract classes differ from interfaces in PHP, and when would you use each?
Article Introduction：Abstract classes and interfaces have their own uses in PHP. 1. Abstract classes are used to share code, support constructors and control access, and include abstract methods and concrete methods. 2. The interface is used to define behavior contracts. All methods must be implemented and are public by default, and support multiple inheritance. 3. Since PHP8, the interface can contain default methods to implement, but there is still no constructor or state. 4. When using abstract classes, you need to encapsulate implementation details; when using interfaces, you need to define cross-class behavior or build plug-in systems. 5. Can be used in combination: abstract classes implement interfaces or combine multiple interfaces into one abstract class. Select whether the structure plus sharing behavior (abstract class) or only the structure (interface).
2025-06-04
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1144
Java Memory Model and its Importance in Concurrency
Article Introduction：Java Memory Model (JMM) is a set of specifications that define the access rules for shared variables in a multi-threaded environment to ensure visibility, atomicity and orderliness; 1. Visibility problem refers to a thread's modification of variables that cannot be timely perceived by other threads, and can be solved through volatile, synchronized or Lock; 2. Atomicity means that operations cannot be interrupted, and composite operations such as i need to ensure atomicity through synchronized or Atomic classes; 3. Order prevents instructions from reordering, and uses volatile's read and write semantics or synchronized blocks to establish happens-before relationships; happens-before principle includes program order, lock,
2025-08-04
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125
What are some common use cases for Redis in a PHP application (e.g., caching, session handling)?
Article Introduction：Redis has four main core uses in PHP applications: 1. Cache frequently accessed data, such as query results, HTML fragments, etc., and control the update frequency through TTL; 2. Centrally store session information to solve the problem of session inconsistency in multi-server environments. The configuration method is to set session.save_handler and session.save_path in php.ini; 3. Implement current limiting and temporary counting, such as limiting the number of login attempts per hour, and using keys with expiration time for efficient counting; 4. Build a basic message queue, and implement asynchronous task processing through RPUSH and BLPOP operations, such as email sending or image processing, thereby improving system response speed and expansion
2025-06-18
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1000
Understanding JavaScript's Event Loop Mechanism and its Differences from Java's Event Handling
Article Introduction：The event loop of JavaScript is a single-threaded asynchronous processing mechanism, consisting of a call stack, a callback queue and an event loop, which is executed in order of priority between macro tasks and micro tasks; 1. The call stack records the current execution function; 2. The callback queue stores asynchronous callbacks; 3. The event loop continuously checks the call stack and pushes callback execution; Java's event processing is based on multi-threading and adopts a listening-trigger mode, and events are executed in special threads such as EDT; 1. User operations generate events; 2. Events are dispatched to listeners; 3. The callback method is executed synchronously in a specific thread; the key difference between the two is that JS relies on the event loop to execute tasks sequentially, while Java uses threads to implement parallel processing.
2025-07-23
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696
Mastering Complex Sorting in PHP with `usort` on Multidimensional Arrays
Article Introduction：usort() is the preferred method for handling complex sorting of PHP multidimensional arrays. It supports multiple sorting conditions, mixed data types, and dynamic priorities through custom comparison functions. 1. When using usort(), the array and callback function are passed, the callback receives two subarray elements and returns the comparison result, and uses functions such as operators or strcasecmp() to implement sorting logic; 2. For multi-condition sorting, the fields and directions can be dynamically specified through the createSortCallback() function, first in descending order of score and then ascending order in age; 3. String sorting should be done using strcasecmp() to achieve case insensitiveness, or the Collator class supports internationalized characters; 4. Pay attention to usort(
2025-08-08
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Dave The Diver: How To Catch Spider Crabs
Article Introduction：In Dave The Diver, there are some creatures that are not easy to catch. Or, catch alive that is. The spider crab is one of those very species, making it seem like the only way to bring these crustaceans back up to land is to viciously crack them up w
2025-01-10
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903
Prepare for Interview Like a Pro with Interview Questions CLI
Article Introduction：Prepare for Interview Like a Pro with Interview Questions CLI
What is the Interview Questions CLI?
The Interview Questions CLI is a command-line tool designed for JavaScript learners and developers who want to enhance their interview
2025-01-10
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1516
Soft Deletes in Databases: To Use or Not to Use?
Article Introduction：Soft Deletes: A Question of DesignThe topic of soft deletes, a mechanism that "flags" records as deleted instead of physically removing them, has...
2025-01-10
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1115
Terraria: How To Make A Loom
Article Introduction：There are a lot of crafting stations that you can make in Terraria. This ranges from simple anvils to unique stations meant for one specific type of resource. Early into the game, you'll be able to make your own Loom, which is primarily used to make
2025-01-10
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