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126 lines
3.4 KiB
C
126 lines
3.4 KiB
C
#include "io_internal.h"
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#ifdef HAVE_EPOLL
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#include <sys/epoll.h>
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#endif
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#ifdef HAVE_KQUEUE
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#include <sys/types.h>
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#include <sys/event.h>
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#include <sys/time.h>
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#endif
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#include <errno.h>
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int iom_wait(iomux_t* c,int64* s,unsigned int* revents,unsigned long timeout) {
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for (;;) {
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/* If we have an event in the queue, use that one */
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int r;
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if (c->working==-2) return -2; /* iomux was aborted */
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for (;;) {
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unsigned int f=c->l;
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if (f == c->h)
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break; /* no elements in queue */
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int n=(f+1)%SLOTS;
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if (__sync_bool_compare_and_swap(&c->l,f,n)) {
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/* we got one, and its index is in f */
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*s=c->q[f].fd;
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*revents=c->q[f].events;
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}
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/* collided with another thread, try again */
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}
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/* The queue was empty. If someone else is already calling
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* epoll_wait/kevent, then use the semaphore */
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if (__sync_bool_compare_and_swap(&c->working,0,1)) {
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/* we have the job to fill the struct. */
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int freeslots = (c->h - c->l);
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if (!freeslots) freeslots=SLOTS;
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#ifdef HAVE_EPOLL
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struct epoll_event ee[SLOTS];
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int i;
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r=epoll_wait(c->ctx, ee, freeslots, timeout);
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if (r<=0) {
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/* we ran into a timeout, so let someone else take over */
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if (__sync_val_compare_and_swap(&c->working,1,0)==-2) return -2;
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#ifdef __dietlibc__
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cnd_broadcast(&c->sem);
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#else
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sem_post(&c->sem);
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#endif
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return r;
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}
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for (i=0; i<r; ++i) {
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/* convert events */
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int e = ((ee[i].events & (EPOLLIN|EPOLLHUP|EPOLLERR)) ? IOM_READ : 0) |
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((ee[i].events & (EPOLLOUT|EPOLLHUP|EPOLLERR)) ? IOM_WRITE : 0) |
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((ee[i].events & EPOLLERR) ? IOM_ERROR : 0);
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if (i+1==r) {
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/* return last event instead of enqueueing it */
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*s=ee[i].data.fd;
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*revents=e;
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} else {
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c->q[c->h].fd=ee[i].data.fd;
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c->q[c->h].events=e;
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c->h = (c->h + 1) % SLOTS;
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}
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}
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#elif defined(HAVE_KQUEUE)
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struct kevent kev[SLOTS];
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struct timespec ts = { .tv_sec=timeout/1000, .tv_nsec=(timeout%1000)*1000000 };
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int r=kevent(c->ctx, 0, 0, kev, freeslots, &ts);
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int i;
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if (r<=0) {
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/* we ran into a timeout, so let someone else take over */
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if (__sync_val_compare_and_swap(&c->working,1,0)==-2) return -2;
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#ifdef __dietlibc__
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cnd_broadcast(&c->sem);
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#else
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sem_post(&c->sem);
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#endif
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return r;
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}
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for (i=0; i<r; ++i) {
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/* convert events */
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int e = (kev[i].filter == EVFILT_READ ? IOM_READ : 0) |
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(kev[i].filter == EVFILT_WRITE ? IOM_WRITE : 0);
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if (i+1==r) {
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/* return last event instead of enqueueing it */
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*s=kev[i].ident;
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*revents=e;
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} else {
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c->q[c->h].fd=kev[i].ident;
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c->q[c->h].events=e;
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c->h = (c->h + 1) % SLOTS;
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}
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}
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#else
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#warning "only epoll and kqueue supported for now"
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#endif
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/* We need to signal the other threads.
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Either there are other events left, or we need one of them to
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wake up and call epoll_wait/kevent next, because we aren't
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doing it anymore */
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if (__sync_val_compare_and_swap(&c->working,1,0)==-2) return -2;
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#ifdef __dietlibc__
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cnd_signal(&c->sem);
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#else
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sem_post(&c->sem);
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#endif
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return 1;
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} else {
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/* somebody else has the job to fill the queue */
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struct timespec ts;
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ts.tv_sec = timeout / 1000;
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ts.tv_nsec = (timeout % 1000) * 1000000;
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#ifdef __dietlibc__
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r=cnd_timedwait(&c->sem,&c->mtx,&ts);
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#else
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r=sem_timedwait(&c->sem,&ts);
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#endif
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if (r==-1) {
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if (errno==ETIMEDOUT) return 0;
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return -1;
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}
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/* fall through into next loop iteration */
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}
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}
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}
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