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ae_epoll.cc
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ae_epoll.cc
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/* Released under the BSD license. See the COPYING file for more info. */
#include <sys/epoll.h>
typedef struct aeApiState
{
int epfd;
struct epoll_event *events;
} aeApiState;
static int aeApiCreate(aeEventLoop *eventLoop)
{
aeApiState *state = zmalloc(sizeof(aeApiState));
if (!state) return -1;
state->events = zmalloc(sizeof(struct epoll_event)*eventLoop->setsize);
if (!state->events) {
zfree(state);
return -1;
}
state->epfd = epoll_create(1024); /* 1024 is just an hint for the kernel */
if (state->epfd == -1) {
zfree(state->events);
zfree(state);
return -1;
}
eventLoop->apidata = state;
return 0;
}
static void aeApiFree(aeEventLoop *eventLoop)
{
aeApiState *state = eventLoop->apidata;
close(state->epfd);
zfree(state->events);
zfree(state);
}
static int aeApiAddEvent(aeEventLoop *eventLoop, int fd, int mask)
{
aeApiState *state = eventLoop->apidata;
struct epoll_event ee;
/* If the fd was already monitored for some event, we need a MOD
* operation. Otherwise we need an ADD operation. */
int op = eventLoop->events[fd].mask == AE_NONE ? EPOLL_CTL_ADD
: EPOLL_CTL_MOD;
ee.events = 0;
/**
* Modify by wangqiying. Since it's a littele expensive to invoke epoll_ctl,
* try check mask to avoid some epoll_ctl invocations
*/
int oldmask = eventLoop->events[fd].mask;
mask |= eventLoop->events[fd].mask; /* Merge old events */
if (mask == oldmask)
{
return 0;
}
if (mask & AE_READABLE)
ee.events |= EPOLLIN;
if (mask & AE_WRITABLE)
ee.events |= EPOLLOUT;
ee.data.u64 = 0; /* avoid valgrind warning */
ee.data.fd = fd;
//ee.events |= EPOLLET;
if (epoll_ctl(state->epfd, op, fd, &ee) == -1)
return -1;
return 0;
}
static void aeApiDelEvent(aeEventLoop *eventLoop, int fd, int delmask)
{
aeApiState *state = eventLoop->apidata;
struct epoll_event ee;
int mask = eventLoop->events[fd].mask & (~delmask);
ee.events = 0;
if (mask & AE_READABLE)
ee.events |= EPOLLIN;
if (mask & AE_WRITABLE)
ee.events |= EPOLLOUT;
ee.data.u64 = 0; /* avoid valgrind warning */
ee.data.fd = fd;
if (mask != AE_NONE)
{
epoll_ctl(state->epfd, EPOLL_CTL_MOD, fd, &ee);
}
else
{
/* Note, Kernel < 2.6.9 requires a non null event pointer even for
* EPOLL_CTL_DEL. */
epoll_ctl(state->epfd, EPOLL_CTL_DEL, fd, &ee);
}
}
static int aeApiPoll(aeEventLoop *eventLoop, struct timeval *tvp)
{
aeApiState *state = eventLoop->apidata;
int retval, numevents = 0;
retval = epoll_wait(state->epfd,state->events,eventLoop->setsize,
tvp ? (tvp->tv_sec*1000 + tvp->tv_usec/1000) : -1);
if (retval > 0) {
int j;
numevents = retval;
for (j = 0; j < numevents; j++)
{
int mask = 0;
struct epoll_event *e = state->events + j;
if (e->events & (EPOLLHUP | EPOLLERR))
{
mask = AE_READABLE | AE_WRITABLE;
}
else
{
if (e->events & EPOLLIN)
mask |= AE_READABLE;
if (e->events & EPOLLOUT)
mask |= AE_WRITABLE;
}
eventLoop->fired[j].fd = e->data.fd;
eventLoop->fired[j].mask = mask;
}
}
return numevents;
}
static char *aeApiName(void)
{
return "epoll";
}