The guidance and initialization of the system is the first step of the operating system control, and it is also an important part to embody the system. Linux, as a free quasi-Unix operating system, has performed well in many amateur and
There are two different ways to use regular expressions in PHP: PCRE (Perl compatible notation, preg_*) function and POSIX (POSIX extended notation, ereg_*) functions. Luckily, the POSIX family function was deprecated from the PHP 5.3.0.
An operating system is a collection of system software that manages the hardware resources of a computer, controls the operation of other programs, and provides the user with an interactive interface. The operating system is a key
First, in the previous introduction of System V Message Queuing knowledge, now to a little look at POSIX Message Queuing.
In fact, Message Queuing is a place where you can exchange data between processes, and the biggest difference between two
Installing Oracle 9ir2 on RHEL as 3 step-by-step
Installing Oracle 9ir2 on Red Hat Enterprise Linux Advanced Server 3 (RHEL 3)
Red Hat, the world's largest Linux manufacturer, recently released the Red Hat Enterprise Linux 3.
First talk about the implementation of the PHP program process, which explains this, just to start our optimization trip.
Client (for example, browser)
-"Request Get hello.php
--The CGI server (for example, Apache) receives a request to find a
In a multiprocessor architecture for shared memory, you can use threads to implement parallelism. For Unix systems, the IEEE POSIX 1003.1c Standard prescribes the standard for the C language Threading programming interface. The
One of the major challenges you will face when porting code to the z/OS platform is the availability of the POSIX semaphore API on z/OS. Typically, many of the programs running on the Linux/unix/windows platform are developed with POSIX
A condition variable compensates for the lack of a mutex by allowing the thread to block and wait for another thread to send a signal, which is often used in conjunction with a mutex lock. When used, a condition variable is used to block a thread,
Shallow talking about Java VM discovery
In the second half of this article, the author's experience with the Java VM actually, and the bit-sharing, will be focused on several
Open Source Java VM dedicated discussion, the pen itself is
In general, user processes are not able to access kernel space. It can neither access the data in the kernel nor access the functions in the kernel. In the Linux kernel, however, a set of functions for implementing various system functions became a
The definition of the PHP regular expression:
A syntax rule used to describe the character arrangement and matching pattern. It is mainly used for pattern segmentation, matching, lookup and substitution operations of strings.
Regular functions in
Linux prevents anyone from using the SU command as the root method:
Auth sufficient/lib/security/pam_rootok.so Debug
Auth required/lib/security/pam_wheel.so Group=wheel
2. The wheel group is defined in the/etc/pam. D/SU
Read-Write Locks and mutexes (mutexes) are similar and are another thread synchronization mechanism, but are not POSIX-standard and can be used to synchronize individual threads in the same process. Of course, if a read-write lock is stored in a
In January 1995, Scott Meyers in the C + + magazine that "Min,max is a big challenge for the C + + community", he analyzed the Min,max based on macro-based, and compared min based on the template, Max implementation, he got the following conclusion:
Pthread series functions and simple multi-threaded server-side programs
First, POSIX thread overview
We know that processes are running in separate address spaces, and that sharing data between processes requires interprocess communication, in
Regular expressions, as a quick and convenient tool for handling strings, are widely used in a variety of programming languages, and some of the techniques used in PHP are documented below.
My regular primer is an article originating from the Web 
Linux Open File number too many open files solution
Too many open files is prompted because the number of file/socket connections that the program opens exceeds the system setting.
To view the maximum allowable number of open files per user
Creating and terminating Threads
The common APIs for threading management are:
Pthread_ Attr_init (attr)
To create a thread:
Use of GREP commands in Linux
grep (Global search Regular expression (RE) and print out of the line, a comprehensive search for regular expressions and print out rows) is a powerful text search tool that uses regular expressions to search for text.
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