There are many ways in the daemon to prevent another copy from starting. In this section, the example code uses the operation of locking files to ensure the system. ]
When a process is reading or modifying a part of a file, the use of a record lock can prevent other processes from modifying the same file area; for the Unix system... ]
UNIX Network Programming Volume 2: inter process communication. The fifth chapter Posix message queue sample code implements a message queue based on file memory mapping to create shared memory implementation. In order to avoid access conflicts of different threads, Posix mutual exclusion and Posix conditional variables are introduced. This article mainly records several key points in the implementation process to prepare for a rainy day.
After installing the system, install Chrome, login account automatically synchronize bookmarks, history and plug-ins and other information. Everything looks very smooth. ]
More than a few browsers can download different resources of SkyDrive. Meanwhile, it means that the browser's user data is independent, rather than opening several tabs. For example, you can use IE browser to download the first resource, then open the Edge browser to download second resources, then open the Chrome browser to download third resources, and finally use the Chrome browser's stealth mode to download fourth resources.
The character set can be in initdb, CREATEDB, and create database” [... ]
This paper gives a brief summary of the fifth chapter Posix message queue of UNIX Network Programming Volume 2: interprocess communication, introduces the flow of message queue function, the method of message queuing interprocess communication, and their pros and cons.
In the way of programmer's training -- from a laborer to an expert, I mentioned the orthogonality principle in software system design. "Orthogonality" is a fresh [to me]. ]
The execution of every command in Dockfile will add a new mirror layer to the underlying image, even if a file is created. ]
There are two main ways to configure processes in Docker containers: to transfer environment variables to set up environment variables when hosts start a container. ]