c语言如何实现事件循环
想用c语言实现类似glib mainloop那样的事件循环机制，求思路或方向，谢谢各位大神！
写回答
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专注物联网struct pollfd fds[2];
int timeout_msecs = 500;
int ret;
int i;
/ Open STREAMS device. /
fds[0].fd = open("/dev/dev0", ...);
fds[1].fd = open("/dev/dev1", ...);
fds[0].events = POLLOUT | POLLWRBAND;
fds[1].events = POLLOUT | POLLWRBAND;
while(1) {ret = poll(fds, 2, timeout_msecs);
if (ret > 0) {/ An event on one of the fds has occurred. /
for (i=0; i<2; i++) {
if (fds[i].revents & POLLWRBAND) {
/ Priority data may be written on device number i. /
...
}
if (fds[i].revents & POLLOUT) {
/ Data may be written on device number i. /
...
}
if (fds[i].revents & POLLHUP) {
/ A hangup has occurred on device number i. /
...
}
}
}
}2019-07-17 19:30:37赞同 展开评论 打赏 -
软件开发，安全加密struct pollfd fds[2];
int timeout_msecs = 500;
int ret;
int i;
/ Open STREAMS device. /
fds[0].fd = open("/dev/dev0", ...);
fds[1].fd = open("/dev/dev1", ...);
fds[0].events = POLLOUT | POLLWRBAND;
fds[1].events = POLLOUT | POLLWRBAND;
while(1) {ret = poll(fds, 2, timeout_msecs);
if (ret > 0) {/ An event on one of the fds has occurred. /
for (i=0; i<2; i++) {
if (fds[i].revents & POLLWRBAND) {
/ Priority data may be written on device number i. /
...
}
if (fds[i].revents & POLLOUT) {
/ Data may be written on device number i. /
...
}
if (fds[i].revents & POLLHUP) {
/ A hangup has occurred on device number i. /
...
}
}
}
}2019-07-17 19:30:36赞同 展开评论 打赏 -
乐于学习与分析struct pollfd fds[2];
int timeout_msecs = 500;
int ret;
int i;
/ Open STREAMS device. /
fds[0].fd = open("/dev/dev0", ...);
fds[1].fd = open("/dev/dev1", ...);
fds[0].events = POLLOUT | POLLWRBAND;
fds[1].events = POLLOUT | POLLWRBAND;
while(1) {ret = poll(fds, 2, timeout_msecs);
if (ret > 0) {/* An event on one of the fds has occurred. */ for (i=0; i<2; i++) { if (fds[i].revents & POLLWRBAND) { /* Priority data may be written on device number i. */ ... } if (fds[i].revents & POLLOUT) { /* Data may be written on device number i. */ ... } if (fds[i].revents & POLLHUP) { /* A hangup has occurred on device number i. */ ... } }}
}2019-07-17 19:30:36赞同 展开评论 打赏 -
你首先要确定是哪类的 EVENT。
好吧，我来做一个通用的回答。通畅，在 linux 端，我们会使用 epoll 函数来做事件循环：
如下举例：
2019-07-17 19:30:36赞同 展开评论 打赏 -
一个很 ugly （但有效）的解决方案：
定义一个 struct Event 的队列struct Event event; while (1) { if (empty(event_queue)) sleep(WAITING); else { event = get_first_element(event_queue); remove_first_element(event_queue); process... } }2019-07-17 19:30:36赞同 展开评论 打赏
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