sigalrm

When making a blocking system call, you can set timers for these blocking system calls to avoid waiting for the process to fall into an infinite period.        Linux provides alarm system calls and SIGALRM signals to implement this function. To use

We often encounter problems with setting timeouts for blocking operations, such as blocking sockets read Read setting 10-second timeout, one of which is to call the alarm function, which generates a SIGALRM signal during the specified time-out

Each thread has its own signal shielding word, but the signal processing is shared by all threads in the process. This means that although a single thread can block some signals, when the thread modifies the processing behavior related to a certain

The following are some simple heartbeats for sending customers and server programs. These functions can detect premature failure of the Peer host or the communication path to the peer.Before providing these functions, we must give some

Setitimer () is a Linux API, not the standard library of C language. Setitimer () has two functions: one is to execute a function after a period of time, and the other is to execute a function for a period of time. The following program demo shows

inter-process communication -- SignalTenet: The learning of technology is limited and the spirit of sharing is limitless.First, Signals and interrupts1. Basic Signal Concepts(1) Send signal: Generate signal, there are many ways to send a signal "one

To write servers under Linux, processing signals is unavoidable. The processing of signals in multiple threads and single threads is a bit different. Reference:Http://maxim.int.ru/bookshelf/PthreadsProgram/htm/r_40.htmlhttp://aboocool.blog.51cto.com/

Refer to this article:Http://www.cnblogs.com/coding-my-life/p/4782529.htmlUnder Linux, each process has its own signal mask, which specifies which signal is blocked, which is not blocked, and is usually handled by calling Sigmask. At the same time

Lienhua342014-11-031 Signal Transfer processThe signal source generates a signal for the target process, which is then determined by the kernel to pass the signal to the target process. From the signal generation to the flow to the target process,

Signal is a very important part of Linux programming, this article will detail the basic concept of signal mechanism, the approximate realization method of Linux to signal mechanism, how to use signal, and several system calls about signal.Signal

in the Linux: On the signal in the blog post we wrote a mysleep, but in fact this function in the multi-threaded environment will be wrong, that is, our mysleep function is not reentrant function,Now re-examine the "mysleep" program and imagine the

A signal is a software interrupt, an asynchronous communication method that handles an asynchronous event. For example, we run the program in the terminal, by pressing the keyboard "CTRL + C", you can send a SIGINT interrupt signal to stop the

The signal source generates a signal for the target process , which is then determined by the kernel to pass the signal to the target process. The flowchart from the signal generation to the target process is as follows:Processes can block the

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 Module Introduction Recently looking at Linux signal related content, signal can be used for interprocess communication and asynchronous processing. The Python standard library provides signal packages that can be used to handle signal

Use of timers in Linux -- alarm () & setitimer (): 1. Alarm-------------------------------------------Alarm () and signal () are enough if they are not required to be accurate.Unsigned int alarm (unsigned int seconds)Function Description: Alarm ()

The basic concept of signal Each signal has a number and a macro definition name that can be signal.h found in. Use the kill -l command to view the list of signals defined in the system: 1-31 is a normal signal; 34-64 is a live signal. All

1. Time Representation In the program, we often need to output the current time of the system, for example, the output result using the date command. At this time, we can use the following two functions: # Include Time_t time (time_t * tloc ); Char *

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

There are two types of timers in Linux:　1. Alarm　Alarm () and signal () are enough if they are not required to be accurate.　Unsigned int alarm (unsigned int seconds)　Function Description: Alarm () is used to set the signal sigalrm to be transmitted