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#ifndef EPOLL_H
#define EPOLL_H
#include <sys/epoll.h>
#include <sys/eventfd.h>
#include <unistd.h>
#include <fcntl.h>
#include <chrono>
#include <algorithm>
#include <vector>
#include <mutex>
typedef int uv_os_sock_t;
static const int UV_READABLE = EPOLLIN;
static const int UV_WRITABLE = EPOLLOUT;
struct Poll;
struct Timer;
extern std::recursive_mutex cbMutex;
extern void (*callbacks[16])(Poll *, int, int);
extern int cbHead;
struct Timepoint {
void (*cb)(Timer *);
Timer *timer;
std::chrono::system_clock::time_point timepoint;
int nextDelay;
};
struct Loop {
int epfd;
int numPolls = 0;
bool cancelledLastTimer;
int delay = -1;
epoll_event readyEvents[1024];
std::chrono::system_clock::time_point timepoint;
std::vector<Timepoint> timers;
std::vector<std::pair<Poll *, void (*)(Poll *)>> closing;
void (*preCb)(void *) = nullptr;
void (*postCb)(void *) = nullptr;
void *preCbData, *postCbData;
Loop(bool defaultLoop) {
epfd = epoll_create1(EPOLL_CLOEXEC);
timepoint = std::chrono::system_clock::now();
}
static Loop *createLoop(bool defaultLoop = true) {
return new Loop(defaultLoop);
}
void destroy() {
::close(epfd);
delete this;
}
void run();
int getEpollFd() {
return epfd;
}
};
struct Timer {
Loop *loop;
void *data;
Timer(Loop *loop) {
this->loop = loop;
}
void start(void (*cb)(Timer *), int timeout, int repeat) {
loop->timepoint = std::chrono::system_clock::now();
std::chrono::system_clock::time_point timepoint = loop->timepoint + std::chrono::milliseconds(timeout);
Timepoint t = {cb, this, timepoint, repeat};
loop->timers.insert(
std::upper_bound(loop->timers.begin(), loop->timers.end(), t, [](const Timepoint &a, const Timepoint &b) {
return a.timepoint < b.timepoint;
}),
t
);
loop->delay = -1;
if (loop->timers.size()) {
loop->delay = std::max<int>(std::chrono::duration_cast<std::chrono::milliseconds>(loop->timers[0].timepoint - loop->timepoint).count(), 0);
}
}
void setData(void *data) {
this->data = data;
}
void *getData() {
return data;
}
// always called before destructor
void stop() {
auto pos = loop->timers.begin();
for (Timepoint &t : loop->timers) {
if (t.timer == this) {
loop->timers.erase(pos);
break;
}
pos++;
}
loop->cancelledLastTimer = true;
loop->delay = -1;
if (loop->timers.size()) {
loop->delay = std::max<int>(std::chrono::duration_cast<std::chrono::milliseconds>(loop->timers[0].timepoint - loop->timepoint).count(), 0);
}
}
void close() {
delete this;
}
};
// 4 bytes
struct Poll {
protected:
struct {
int fd : 28;
unsigned int cbIndex : 4;
} state = {-1, 0};
Poll(Loop *loop, uv_os_sock_t fd) {
fcntl(fd, F_SETFL, fcntl(fd, F_GETFL, 0) | O_NONBLOCK);
state.fd = fd;
loop->numPolls++;
}
// todo: pre-set all of callbacks up front and remove mutex
void setCb(void (*cb)(Poll *p, int status, int events)) {
cbMutex.lock();
state.cbIndex = cbHead;
for (int i = 0; i < cbHead; i++) {
if (callbacks[i] == cb) {
state.cbIndex = i;
break;
}
}
if (state.cbIndex == cbHead) {
callbacks[cbHead++] = cb;
}
cbMutex.unlock();
}
void (*getCb())(Poll *, int, int) {
return callbacks[state.cbIndex];
}
void reInit(Loop *loop, uv_os_sock_t fd) {
state.fd = fd;
loop->numPolls++;
}
void start(Loop *loop, Poll *self, int events) {
epoll_event event;
event.events = events;
event.data.ptr = self;
epoll_ctl(loop->epfd, EPOLL_CTL_ADD, state.fd, &event);
}
void change(Loop *loop, Poll *self, int events) {
epoll_event event;
event.events = events;
event.data.ptr = self;
epoll_ctl(loop->epfd, EPOLL_CTL_MOD, state.fd, &event);
}
void stop(Loop *loop) {
epoll_event event;
epoll_ctl(loop->epfd, EPOLL_CTL_DEL, state.fd, &event);
}
bool fastTransfer(Loop *loop, Loop *newLoop, int events) {
stop(loop);
start(newLoop, this, events);
loop->numPolls--;
// needs to lock the newLoop's numPolls!
newLoop->numPolls++;
return true;
}
bool threadSafeChange(Loop *loop, Poll *self, int events) {
change(loop, self, events);
return true;
}
void close(Loop *loop, void (*cb)(Poll *)) {
state.fd = -1;
loop->closing.push_back({this, cb});
}
public:
bool isClosed() {
return state.fd == -1;
}
uv_os_sock_t getFd() {
return state.fd;
}
friend struct Loop;
};
// this should be put in the Loop as a general "post" function always available
struct Async : Poll {
void (*cb)(Async *);
Loop *loop;
void *data;
Async(Loop *loop) : Poll(loop, ::eventfd(0, EFD_CLOEXEC)) {
this->loop = loop;
}
void start(void (*cb)(Async *)) {
this->cb = cb;
Poll::setCb([](Poll *p, int, int) {
uint64_t val;
if (::read(((Async *) p)->state.fd, &val, 8) == 8) {
((Async *) p)->cb((Async *) p);
}
});
Poll::start(loop, this, UV_READABLE);
}
void send() {
uint64_t one = 1;
if (::write(state.fd, &one, 8) != 8) {
return;
}
}
void close() {
Poll::stop(loop);
::close(state.fd);
Poll::close(loop, [](Poll *p) {
delete p;
});
}
void setData(void *data) {
this->data = data;
}
void *getData() {
return data;
}
};
#endif // EPOLL_H
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