Before starting to answer, let’s briefly talk about all existing inter-process IPC methods in Linux:
1. **Pipe: **Allocate a page size of memory when it is created, and the buffer size is relatively limited;
2. Message queue : information is copied twice, additional CPU consumption; inappropriate for frequent or large amount of information communication;
3 . shared memory : no need to copy and share buffer pay directly attach to the process virtual address space, fast; but the synchronization between processes operating system can not be achieved, the processes must use synchronization tools to solve;
4. sockets : as a more general The interface is low in transmission efficiency and is mainly used for communication between unconnected machines or across networks;
5. Semaphore : It is often used as a locking mechanism to prevent a process from accessing a shared resource while other processes are also accessing the resource. Therefore, it is mainly used as a means of synchronization between processes and between different threads in the same process.
6. Signal : Not suitable for information exchange, but more suitable for process interrupt control, such as illegal memory access, killing a process, etc.;
Android's kernel is also based on the Linux kernel. Why not directly adopt Linux's existing process IPC solution? Didn't so many outstanding people in the Linux community consider that there is a better solution like Binder? Is Google too good? The fact is that the truth is not the case, please look down carefully and you will understand.
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The main problem in the Android industry is that there are too many junior Androids and too many programmers who can write xml and Activity. The junior and intermediate level programmers face great competition, and the status quo is biased towards advanced developers. More and more junior and intermediate Android programmers cannot find a satisfactory job, or even a job at all! Therefore, many people think that Android is going to be cold, and even do not hesitate to change careers and learn other technologies from scratch.
The current Android recruitment requirements are no longer the requirements many years ago.
The development of Android application development has become a very mature technology direction. From the current situation, Android development is very hot, but advanced Android development talents are relatively few. Now mobile Internet developers are gradually starting to pay attention to plug-in technology. , Performance optimization, industry new technologies, system architecture and other advanced technologies.
This has also created a phenomenon. Android developers feel that the industry is now in a two-tier environment. The technology is not comprehensive, and it is still at the low-end technical level. It is hard to write code for a year. A salary increase of 2,000 yuan, crazy overtime work, salary cuts, and constant fear of being laid off. However, middle and senior developers are favored by enterprises. Salaries are getting higher and higher. At the same time, there are also market positions. The status quo that many mid-to-low-end developers compete for one position, while mid-senior developers compete for multiple positions.
How to become an Android mobile internet architect?
In view of your current situation, and to help you improve yourself in a relatively short period of time, today, I will organize and share a Tencent T3 level Android advanced technology syllabus and course for you. There are learning materials at the end of the article.
Android architect topic
Android bottom development engineer
Senior Android UI Engineer
Android essential performance optimization
Hybrid development engineer
At last
For the convenience of friends with learning needs, I organized all the materials into video tutorials (in fact, it took a lot more effort than expected). Due to the limited space, they are all on my GitHub. Click to get them for free!
Androidndroid architecture video + BAT interview topic PDF + study notes
It’s easy to be a programmer. Being a good programmer requires continuous learning. From junior programmer to senior programmer, from junior architect to senior architect, or to management, from technical manager to technical director, every stage Need to master different abilities. Determine your career direction early to get rid of your peers in your work and ability improvement.
- No matter what your current level is, you must continue to learn that there is no chicken soup. Others seem to be effortless, but in fact they took a lot of effort. These four words are my advice! !
- I hope that every IT engineer who works hard will get what he wants, because we have worked so hard and we deserve it.
It’s easy to be a programmer. Being a good programmer requires continuous learning. From junior programmer to senior programmer, from junior architect to senior architect, or to management, from technical manager to technical director, every stage Need to master different abilities. Determine your career direction early to get rid of your peers in your work and ability improvement.
No matter what your current level is, you must continue to learn. There is no chicken soup. Others seem to be effortless, but in fact, it takes a lot of effort. No one can casually succeed.
Get rid of peers in promotion.
No matter what your current level is, you must continue to learn. There is no chicken soup. Others seem to be effortless, but in fact, it takes a lot of effort. No one can casually succeed.
Come on and encourage each other.