flock example c

Refer to the differences between FCNTL (), LOCKF, flock in LinuxWhat is the difference between these three functions , which are all about locking up a file?First flock and fcntl are system calls, and LOCKF is a library function . LOCKF is actually

Recently I often need to SSH to several computers at the same time to do a lot of work that needs to wait and can be done at the same time. For example: 1. Let the remote computer update the kit at the same time 2. Simultaneous transfer of small

Bool flock (int handle, int operation [, int & wouldblock]);The handle of the flock () operation must be an opened file pointer. Operation can be one of the following values:1. To obtain the shared Lock (read program), set operation to LOCK_SH (PHP 4

Header file # include Defines the int flock (int fd, int operation) function ); Function Description: Flock () performs various locking or unlocking actions on the file referred to by the parameter FD according to the method specified by the

Pitfalls in crond using the flock command You need to execute a PHP script on a regular basis. The first thought is to use the crond command to implement this function. However, a strange thing was found during the execution of crond. The

Linux's crontab command, which can be performed on a regular basis, and the minimum cycle is executed once per minute. About Crontab implementation per second can refer to my previous article "Linux Crontab implementation per second" Now there is a

In view of the previous introduction of the Swoole, the Swoole server/client and the multi-process mechanism are used to describe the lock. This article mainly introduces the PHP file lock and Process lock Use example, here only for the PHP lock

Often in the shell script to block other processes, such as MSMTP mail queue script, this script mutex is not correct, the following is the three found in the file to achieve mutual exclusion of the correct approach. 1. The Flock of Util-linux

I. What is file lock? No one will be unfamiliar with the word lock, because there are a lot of locks in our lives, and they play their role in all aspects, the lock function in the world can be summarized as one sentence, that is, to prevent some

One, what is file lockFor the word lock, we must not be unfamiliar, because we live in a large number of locks, they play its role in all aspects of the world, now the function of the lock can be summed up as a sentence, is to prevent some people do