$read= array($socket1,$socket2); $write=NULL; $except=NULL; $num_changed_sockets=socket_select($read,$write,$except,0); if ($num_changed_sockets===false) { /* Error handling */ } else if ($num_changed_sockets>0) { /* At least at one of the sockets something interesting happen...
/* 相比于select与poll,epoll最大的好处是不会随着关心的fd数目的增多而降低效率 */ int main(void) { int count = 0; int listenfd; if ((listenfd = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0) ERR_EXIT("socket"); struct sockaddr_in servaddr; memset(&servaddr, 0, sizeof(servaddr...
Re: Socket select call ? For a socket associated with a TCP connection a read return of zero indicates (as it does on virtually _all_ platforms) that the remote TCP has sent us a FINished segment meaning that we can expect to receive no more data from the remote. ...
=AF_INET;address.sin_addr.s_addr=INADDR_ANY;address.sin_port=htons(PORT);//bind the socket to localhost port 8888if(bind(master_socket,(struct sockaddr*)&address,sizeof(address))<0){perror("bind failed");exit(EXIT_FAILURE);}printf("Listener on port %d \n",PORT);//try to specify ...
为了节约系统内存的使用,尽量复用资源进行网络数据的接收、发送,就需要一个线程处理多个客户端的socket。一个线程进行多个客户端的交互就是多路复用,多路复用常用的编程接口为select、poll、epoll。其中性能最好的是epoll,一般有大量客户端连接的场景都使用epoll。
select系统调用会返回已就绪的socket数目,但elect不会告诉我们,是哪几个socket已经就绪,我们还需要从头遍历,这很浪费时间。除此之外遍历set大小并不取决于一创建socket个数,而是取决于已创建的socket中的最大的fd. manual手册写的很清楚: The firstnfdsdescriptors are checked in each set; i.e., the descriptors...
Could have used pimpl idiom - but easier way static SOCKET socket_ = INVALID_SOCKET; static WSAEVENT comms_event = 0; tcpclient::tcpclient(connect_callback connectcb, receive_callback receivecb, exception_callback exceptioncb, const int buffersize) : connectfunc_(connectcb), receivefunc_(...
SocketTransport._read_ready()>Traceback(most recent calllast):File"/usr/lib64/python3.12/asyncio/events.py",line88,in_runself._context.run(self._callback,*self._args)RuntimeError:cannot enter context:<_contextvars.Contextobjectat0x7f0303f9d780>isalready enteredExceptionincallback_SelectorSocket...
#include <sys/socket.h> #include <netinet/in.h> #include <arpa/inet.h> #include <signal.h> #include <fcntl.h> #include <sys/wait.h> #include <sys/epoll.h> #include <stdlib.h> #include <stdio.h> #include <errno.h> #include <string.h> ...
[in] timeout LPWSPSelect等候的時間上限,或null封鎖作業的時間上限,格式為時間結構。 [out] lpErrno 錯誤碼的指標。 傳回值 LPWSPSelect函式會傳回已備妥並包含在fd_set結構中的描述元總數,或發生錯誤時SOCKET_ERROR。 如果傳回值是SOCKET_ERROR,lpErrno中提供特定的錯誤碼。