how to boost at t signal

Tags: Linux signal Signal type Non-reliable signal (non-real-time signal) Signals inherited from a Unix system behave as if the signal does not support queueing and may lose signals, such as multiple times of the same

The signal mechanism is a very old process communication method used by Unix. It is used to notify another process (or itself) of what happened to one process, what to do. 1. signal:Signals are a series of macros starting with SIG defined in signal. H, essentially integers. The signal can be sent through a process (calling kill, raise, alarm, abort, or kernel sen

From: http://hi.baidu.com/phps/blog/item/b064b7b71944cff630add1b4.html A struct related to Linux CITIC code, struct sigaction, is mainly used when the sigaction signal is installed and the sigqueue signal is sent.The structure is located in/usr/include/bits/sigaction. h.You can find the description of this structure in it {the system I currently implement is as 4 kernel version 2.6.9-5.el}/* Structure desc

The signal is the oldest of the process communication methods used by UNIX systems. The signal not only can be sent from the kernel to a process, but also can be sent from a process dealings a process. For example, a user starts a program in the background that is going to run for a long time, assumes that it is interrupted, is able to send the SIGTERM signal to

The representation of the signal in the kernelQ The processing action of the signal is called signal recursion (Delivery), the signal from the generation to the state between the recursion, called Signal pending (Pending). A process can choose to block (block) a

Signal and Slots are used for communication between objects. It is one of the core features of Qt and is also the most significant difference between QT and other frameworks.OverviewIn GUI programming, if we change a control, we may want other controls to know; in other words, we want any type of Object to be able to communicate with each other.Some tookits use callback functions for communication, and if you want to advertise some events in a functio

SignalIs the oldest process communication method used by UNIX systems. Signals can not only be sent from the kernel to one process, but also from one process to another. For example, if you start a program that needs to run for a long time in the background and want to interrupt its execution, you can use the kill command to send the SIGTERM signal to the process, SIGTERM will terminate the execution of this process. The

Go from NetworkIn a closer look, there is little difference between events and signals, as long as we can register events or signal response functions in order to be notified when events or signals are generated. One difference, however, is that the return value of the event handler is meaningful, and we want to determine whether we want to continue the handling of the event based on the return value, such as in Qt, if the event handler returns TRUE,

In the LIUNX system in order to execute a command every minute, the most common way is crontab, if you do not want to use Crontab, with colleagues in the program can use the timer to achieve this function, so began to grope, found that need some signal knowledge ...See which signals your Linux supports: kill-l 123456789101112131415 [emailprotected]:~#kill-l 1)SIGHUP2)SIGINT3)SIGQUIT4)SIGILL5)SIGTRAP 6)SIGABRT7)SIGBUS8)SIGFPE9)SIGKILL1

First, the signal The signal is used to notify the process that an asynchronous event has occurred. The kernel can also send a signal to the process because of an internal event, notifying the process that an event has occurred. Note that the signal is only used to notify a process of what has happened and does not pas

Before there is a semaphore mechanism written over SYSTEMV, it is now a signal. The signal here is different from the signal in front. The signal here is a process to the operating system or process of some kind of information, let the operating system or other processes to make some kind of reaction.The

"Several confusing related concepts" Process mutex: In a multi-channel program environment, only one process is allowed to access the critical resource at a time. Process synchronization: Refers to the coordination of multiple related processes in the order of execution. Critical resource: A resource that allows only one process to access it over a period of time. Critical section: The code that accesses critical resources in each process.

Q: No line from the living room, but in the bedroom signal is relatively weak, what is the solution? A: No line by the signal strength and the route itself, the receiver's wireless network card, the use of distance, the middle interval of the number of load-bearing walls, and so on, and even with the neighbor's home without the number of lines are also related. Method One: Antenna gain Normal

, game consoles, high-definition digital STB and other digital video output, the following digital video SDI interface highlights. Digital Video SDI interface: Digital videos SDI interface: SDI interface is the first acronym for the serial interface of the numeral components (serial digital Interface), is by the SMPTE (Society of M Otion picture and television Engineers) a digital video interface standard developed by the organization. SMPTE is an international organization dedicated to the pro

Abstract:The development of the signal processing circuit of the infrared focal plane array is introduced. The basic structure, working mode and application fields of CCD Multi-Channel transmitter (CCD-MUX), time delay integrated CCD (TDI-CCD), MOS and CMOS multi-channel transmitter (CMOS-MUX) are described. Finally, two application circuits of multichannel transmission devices are provided. Keywords:Signal processing circuit of infrared focal plane a

"From the Linux/unix system Programming Manual"The UNIX system provides two ways to change the signal disposition: signal () and sigaction ().The behavior of signal () differs between different UNIX implementations, which means that programs that pursue portability must never use this call to establish a signal handler