Preface
Nowadays, the development of programs is not only to simply meet the needs of users. With the basic popularization of the Internet, whether the system can carry hundreds of millions of visits at the same time, or even hundreds of millions of visits, has become an indispensable part of the development and design. A consideration link.
For example, the recent 6.18, as well as the upcoming Double Eleven and Double Twelve, all need to carry a very high amount of concurrency. Even in Weibo, the transmission of hot information cannot be separated from the support of concurrent programming, otherwise it will be like the collapse of Weibo that we often encounter.
Not long ago, I stumbled across a concurrent programming note, which I asked an Ali god, only the first half. **Introduced his understanding of multithreading in more detail, combined with actual combat analysis and explanation. **Friends who are interested in concurrent programming can take a look.
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Thread basics
1. Basic concepts
- What are processes and threads
- Context switch
- Parallel and concurrency
- Significance, benefits and precautions of high concurrent programming
2. Know the threads in Java
- Java programs are inherently multithreaded
Thread creation start and **** abort
- Create start
- Cancel
3. In-depth understanding of threads
Sharing and collaboration between threads
1. Sharing between threads
synchronized built-in lock
- Object locks and class locks
- Wrong locking and cause analysis
- volatile
- ThreadLocal
2. Collaboration between threads
It is worth noting that the above notes are not very complete for the overall explanation of concurrent programming. I haven't got the latter part of the information yet, or it may be that the Ali god has not had time to sort it out.
Then I recommend a technical book to everyone, "Java Concurrent Programming Practice"
"Java Concurrent Programming Practice"
This book introduces Java thread and concurrency in a simple way. It is a perfect Java concurrency reference manual.
Starting from the basic concepts of concurrency and thread safety, the book introduces how to use the basic concurrency building blocks provided by the class library to avoid concurrency risks, construct thread-safe classes and verify thread-safe rules, and how to integrate small threads The security class is combined into a larger thread-safe class, how to use threads to improve the throughput of concurrent applications, how to identify tasks that can be executed in parallel, how to improve the responsiveness of single-threaded subsystems, how to ensure that concurrent programs perform expected tasks, how to Improve the performance and scalability of concurrent code, and finally introduce some advanced topics, such as explicit locks, atomic variables, non-blocking algorithms, and how to develop custom synchronization tools.
I also have related e-books here , which can be given to you for free along with the notes above .
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to sum up
I will not elaborate on the importance of concurrent programming. In short, to adapt to the development of the Internet, high concurrency technology must be mastered. Larger Internet companies have large user groups, and naturally they cannot do without the support of high concurrency technology.
Therefore, only by mastering high concurrency technology can we be invincible in the fierce competition of entering large factories!