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poll.c
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poll.c
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#include "iowatcher.h"
#ifdef EVENT_POLL
#include "hplatform.h"
#include "hdef.h"
#include "hevent.h"
#ifdef OS_WIN
#define poll WSAPoll
#endif
#ifdef OS_LINUX
#include <sys/poll.h>
#endif
#include "array.h"
#define FDS_INIT_SIZE 64
ARRAY_DECL(struct pollfd, pollfds);
typedef struct poll_ctx_s {
int capacity;
struct pollfds fds;
} poll_ctx_t;
int iowatcher_init(hloop_t* loop) {
if (loop->iowatcher) return 0;
poll_ctx_t* poll_ctx;
HV_ALLOC_SIZEOF(poll_ctx);
pollfds_init(&poll_ctx->fds, FDS_INIT_SIZE);
loop->iowatcher = poll_ctx;
return 0;
}
int iowatcher_cleanup(hloop_t* loop) {
if (loop->iowatcher == NULL) return 0;
poll_ctx_t* poll_ctx = (poll_ctx_t*)loop->iowatcher;
pollfds_cleanup(&poll_ctx->fds);
HV_FREE(loop->iowatcher);
return 0;
}
int iowatcher_add_event(hloop_t* loop, int fd, int events) {
if (loop->iowatcher == NULL) {
iowatcher_init(loop);
}
poll_ctx_t* poll_ctx = (poll_ctx_t*)loop->iowatcher;
hio_t* io = loop->ios.ptr[fd];
int idx = io->event_index[0];
struct pollfd* pfd = NULL;
if (idx < 0) {
io->event_index[0] = idx = poll_ctx->fds.size;
if (idx == poll_ctx->fds.maxsize) {
pollfds_double_resize(&poll_ctx->fds);
}
poll_ctx->fds.size++;
pfd = poll_ctx->fds.ptr + idx;
pfd->fd = fd;
pfd->events = 0;
pfd->revents = 0;
}
else {
pfd = poll_ctx->fds.ptr + idx;
assert(pfd->fd == fd);
}
if (events & HV_READ) {
pfd->events |= POLLIN;
}
if (events & HV_WRITE) {
pfd->events |= POLLOUT;
}
return 0;
}
int iowatcher_del_event(hloop_t* loop, int fd, int events) {
poll_ctx_t* poll_ctx = (poll_ctx_t*)loop->iowatcher;
if (poll_ctx == NULL) return 0;
hio_t* io = loop->ios.ptr[fd];
int idx = io->event_index[0];
if (idx < 0) return 0;
struct pollfd* pfd = poll_ctx->fds.ptr + idx;
assert(pfd->fd == fd);
if (events & HV_READ) {
pfd->events &= ~POLLIN;
}
if (events & HV_WRITE) {
pfd->events &= ~POLLOUT;
}
if (pfd->events == 0) {
pollfds_del_nomove(&poll_ctx->fds, idx);
// NOTE: correct event_index
if (idx < poll_ctx->fds.size) {
hio_t* last = loop->ios.ptr[poll_ctx->fds.ptr[idx].fd];
last->event_index[0] = idx;
}
io->event_index[0] = -1;
}
return 0;
}
int iowatcher_poll_events(hloop_t* loop, int timeout) {
poll_ctx_t* poll_ctx = (poll_ctx_t*)loop->iowatcher;
if (poll_ctx == NULL) return 0;
if (poll_ctx->fds.size == 0) return 0;
int npoll = poll(poll_ctx->fds.ptr, poll_ctx->fds.size, timeout);
if (npoll < 0) {
if (errno == EINTR) {
return 0;
}
perror("poll");
return npoll;
}
if (npoll == 0) return 0;
int nevents = 0;
for (int i = 0; i < poll_ctx->fds.size; ++i) {
int fd = poll_ctx->fds.ptr[i].fd;
short revents = poll_ctx->fds.ptr[i].revents;
if (revents) {
++nevents;
hio_t* io = loop->ios.ptr[fd];
if (io) {
if (revents & (POLLIN | POLLHUP | POLLERR)) {
io->revents |= HV_READ;
}
if (revents & (POLLOUT | POLLHUP | POLLERR)) {
io->revents |= HV_WRITE;
}
EVENT_PENDING(io);
}
}
if (nevents == npoll) break;
}
return nevents;
}
#endif