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#include
#include
#include
int select(nfds, readfds, writefds, exceptfds, timeout)
int nfds;
fd_set *readfds, *writefds, *exceptfds;
struct timeval *timeout;
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exceptfds£ºselect¼àÊÓµÄÒì³£Îļþ¾ä±ú¼¯ºÏ¡£
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FD_SET(int fd, fd_set *fdset)£º½¨Á¢Îļþ¾ä±úfdÓëfdsetµÄÁªÏµ¡£
FD_CLR(int fd, fd_set *fdset)£ºÇå³ýÎļþ¾ä±úfdÓëfdsetµÄÁªÏµ¡£
FD_ISSET(int fd, fdset *fdset)£º¼ì²éfdsetÁªÏµµÄÎļþ¾ä±úfdÊÇ·ñ
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int sockfd;
fd_set fdR;
struct timeval timeout = ..;
...
for(;;) {
FD_ZERO(&fdR);
FD_SET(sockfd, &fdR);
switch (select(sockfd + 1, &fdR, NULL, &timeout)) {&
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include/linux/sched.h
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385 volatile long state;
386 struct thread_info *thread_info;
387 atomic_t usage;
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