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This can involve a combination of operating system constraints and web server software limitations. According to the scope of services to be made available and the capabilities of the operating system as well as hardware considerations such as multi-processing capabilities, a multi-threading model or a single threading model can be preferred.
The operating system does not release the resources allocated to a socket until the socket is closed. This is especially important if the connect call fails and will be retried. When an application closes a socket, only the interface to the socket is destroyed.
Resolving resource contention problems is one of the basic functions of operating systems. Various low-level mechanisms can be used to aid this, including locks, semaphores, mutexes and queues. The other techniques that can be applied by the operating systems include intelligent scheduling, application mapping decisions, and page coloring. [1] [2]
Some operating systems, such as Linux and HP-UX, [citation needed] implement a half-duplex close sequence. If the host actively closes a connection, while still having unread incoming data available, the host sends the signal RST (losing any received data) instead of FIN.
XMMS—X Multimedia System; XMPP—eXtensible Messaging and Presence Protocol; XMS—Extended Memory Specification; XNS—Xerox Network Systems; XP—Cross-Platform; XP—Extreme Programming; XPCOM—Cross Platform Component Object Model; XPI—XPInstall; XPIDL—Cross-Platform IDL; XPS—XML Paper Specification; XSD—XML Schema Definition
In computing, logging is the act of keeping a log of events that occur in a computer system, such as problems, errors or just information on current operations. These events may occur in the operating system or in other software. A message or log entry is recorded for each such event.
In Unix and other POSIX-compatible systems, the parent process can retrieve the exit status of a child process using the wait() family of system calls defined in wait.h. [10] Of these, the waitid() [ 11 ] call retrieves the full exit status, but the older wait() and waitpid() [ 12 ] calls retrieve only the least significant 8 bits of the exit ...
Dereferencing any of these variables could cause a segmentation fault: dereferencing the null pointer generally will cause a segfault, while reading from the wild pointer may instead result in random data but no segfault, and reading from the dangling pointer may result in valid data for a while, and then random data as it is overwritten.