joomla poll

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Basically have a fixed format to use, in this not much to say, this is mainly about the application of XML in creating forms. The function of the form is self-evident, in the module configuration inside has the form, the component inside also has the form, here's configuration inside the parameter setting is the XML generation form, relative to through directly constructs the form to be convenient many, Here, by editing the use of the article form, before using, let's take a look at the types of

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;wait_entry.callback = func1;if (something_not_Ready);Then # Enter the blocking path Add_entry_to_list (Wait_entry, sleep_list); go On:schedule ();if (Something_not_ready);Then Goto go_on; endif del_entry_from_list (Wait_entry, sleep_list); EndIf ...Wake-up mechanismSomething_ready;for_each (sleep_list) as Wait_entry;Do Wait_entry.callback (...);if (wait_entry.exclusion);Then break; EndifdoneWe only need to seriously pay attention to this callback mechanism, it can do things really more than Sel

The essence of Select is 32 bits with 32 integers, that is, the 32*32= 1024来 identifier, and the FD value is 1-1024. When the value of FD exceeds the 1024 limit, the size of the fd_setsize must be modified. At this time, you can identify the 32*max value range of FD.Select is not appropriate for single-process multi-threading, where each thread handles multiple FD.1. All threads are scanned from 1-32*max, and each thread is treated with an FD value, which is a bit wasteful2.1024 Upper limit prob

Select, poll, epoll (2)1. Select source code parsing is based on kernel code 2.6.28. select mainly contains four functions.Sys_select: process the time parameter, and then call core_sys_select.Core_sys_select: process three fd_set parameters (in, out, ex), and then call do_select.Do_select: traverses all fd and performs select/poll. Wait and call sock_poll at the right time.Sock_poll: Use a function pointer

IO multiplexing: A process can monitor multiple descriptors and, once a descriptor is read-ready or written, notifies the process program to read and write accordinglyUsage scenarios:1. When the customer processes multiple descriptors (network sockets) or one customer processes multiple sockets simultaneouslyThe 2.TCP server handles both the listener socket interface and the connected socket.3. One server to handle multiple services or multiple protocols also use I/O multiplexingThe maximum bene

downstairs to eat dinner, go to row file called a braised crucian carp. A little extravagant., every day to eat rice bowls a little unbearable, so, a day has passed, the evening should learn!IO multiplexing implemented by the poll function! , together with yesterday's Select function, they are here to achieve the same function, but the poll function is more efficient! A wider range of use!#include #include

One, select The select is currently supported on almost all platforms, and its good cross-platform support is one of its advantages, and it is, in fact, one of the few advantages it has left. One disadvantage of select is that the number of file descriptors that a single process can monitor has a maximum limit, typically 1024 on Linux, but can be elevated by modifying the macro definition or even recompiling the kernel. In addition, the data structure maintained by select () that stores a lar

The difference between select, poll and Epoll Select Select was first seen in the 4.2BSD in 1983, and it was used by a select () system to monitor multiple file descriptor arrays (everything in Linux is file, block device, socket connection, etc.). ), when Select () returns, the ready file descriptor in the array is changed by the kernel to the flag bit Allows the process to obtain these file descriptors for subsequent read and write operations (sele

, the kernel to dispatch other process to run, passive loses CPU. (Hangs can be preempted by another process, causing it to hang, or to suspend itself on its own initiative.) ) 5 I/O models available under UNIX: 1, blocking I/O 2, non-blocking I/O 3,i/o multiplexing 4, signal-driven I/O (SIGIO) 5, asynchronous i/o1--4 for synchronous i/o,5 for asynchronous I/O. The I/O multiplexing we are concerned with is synchronous I/O, which causes the process to block.There are horizontal triggers in the IO

1. SelectSelect essentially processes the next step by setting or checking the data structure that holds the FD flag bit.Disadvantages:1) The number of FD that can be monitored by a single process is limited.2) The need to maintain a data structure to hold a large number of FD, which will make the user space and kernel space in the transfer of the structure when the replication overhead.3) A linear scan is performed when the FD is scanned. After the FD surge, the IO efficiency is low because eac

Reference book: Linux high-performance server programming, is a personal summary of reading, the above consistent Poll system calls are similar to select, (individuals think that poll and select Master one) is also polling a certain number of file descriptors within a specified time to test if there is a ready person. About the prototype of poll #include int

A blocking/nonblocking method is available when an application accesses a device file. If you are using blocking mode, call Open (), read (), write () directly, but the driver layer will determine whether it is readable/writable, and if unreadable/not writable, the current process will hibernate until it wakes up. If you are using non-blocking, you need to use the poll/select mechanism, and the access to the tag file is o_nonblock when you open the fi

All three are UNIX-based multiplexing kernel interfaces. Select is a cross-platform interface, poll is the systemv standard, and epoll is a proprietary Linux interface, which is transformed Based on Poll. Select Function prototype: Int select (int n,Fd_set * readfds,Fd_set * writefds,Fd_set * required TFDs,Struct timeval * timeout );The SELECT statement monitors arrays of multiple file descriptors through s