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@ -124,44 +124,106 @@ int64 io_waituntil2(int64 milliseconds) {
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if (io_waitmode==EPOLL) {
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int n;
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struct epoll_event y[100];
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io_entry* e;
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if (alt_firstread>=0 && (e=iarray_get(&io_fds,alt_firstread)) && e->canread) {
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// write(1,"r",1);
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return 1;
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}
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if (alt_firstwrite>=0 && (e=iarray_get(&io_fds,alt_firstwrite)) && e->canwrite) {
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// write(1,"w",1);
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return 1;
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}
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// write(1,".",1);
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if ((n=epoll_wait(io_master,y,100,milliseconds))==-1) return -1;
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for (i=0; i<n; ++i) {
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e=iarray_get(&io_fds,y[i].data.fd);
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io_entry* e=iarray_get(&io_fds,y[i].data.fd);
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if (e) {
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int curevents=0,newevents;
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if (e->kernelwantread) curevents |= EPOLLIN;
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if (e->kernelwantwrite) curevents |= EPOLLOUT;
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#ifdef DEBUG
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if ((y[i].events&(EPOLLIN|EPOLLPRI|EPOLLRDNORM|EPOLLRDBAND)) && !e->kernelwantread)
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printf("got unexpected read event on fd #%d\n",y[i].data.fd);
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if ((y[i].events&EPOLLOUT) && !e->kernelwantwrite)
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printf("got unexpected write event on fd #%d\n",y[i].data.fd);
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#endif
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if (y[i].events&(POLLERR|POLLHUP)) {
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/* error; signal whatever app is looking for */
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if (e->wantread) y[i].events|=POLLIN;
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if (e->wantwrite) y[i].events|=POLLOUT;
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}
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if (y[i].events&POLLIN && !e->canread) {
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debug_printf(("io_waituntil2: enqueueing %ld in normal read queue before %ld\n",info.si_fd,first_readable));
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e->canread=1;
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e->next_read=first_readable;
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first_readable=y[i].data.fd;
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newevents=0;
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if (!e->canread || e->wantread) {
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newevents|=EPOLLIN;
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e->kernelwantread=1;
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} else
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e->kernelwantread=0;
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if (!e->canwrite || e->wantwrite) {
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newevents|=EPOLLOUT;
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e->kernelwantwrite=1;
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} else
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e->kernelwantwrite=0;
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/* if we think we can not read, but the kernel tells us that we
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* can, put this fd in the relevant data structures */
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if (!e->canread && (y[i].events&(EPOLLIN|EPOLLPRI|EPOLLRDNORM|EPOLLRDBAND))) {
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if (e->canread) {
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newevents &= ~EPOLLIN;
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} else {
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e->canread=1;
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if (e->wantread) {
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e->next_read=first_readable;
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first_readable=y[i].data.fd;
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}
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}
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}
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if (y[i].events&POLLOUT && !e->canwrite) {
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debug_printf(("io_waituntil2: enqueueing %ld in normal write queue before %ld\n",info.si_fd,first_writeable));
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e->canwrite=1;
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e->next_write=first_writeable;
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first_writeable=y[i].data.fd;
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/* if the kernel says the fd is writable, ... */
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if (y[i].events&EPOLLOUT) {
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/* Usually, if the kernel says a descriptor is writable, we
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* note it and do not tell the kernel not to tell us again.
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* The idea is that once we notify the caller that the fd is
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* writable, and the caller handles the event, the caller will
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* just ask to be notified of future write events again. We
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* are trying to save the superfluous epoll_ctl syscalls.
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* If e->canwrite is set, then this gamble did not work out.
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* We told the caller, yet after the caller is done we still
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* got another write event. Clearly the user is implementing
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* some kind of throttling and we can tell the kernel to leave
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* us alone for now. */
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if (e->canwrite) {
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newevents &= ~EPOLLOUT;
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e->kernelwantwrite=0;
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} else {
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/* If !e->wantwrite: The laziness optimization in
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* io_dontwantwrite hit. We did not tell the kernel that we
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* are no longer interested in writing to save the syscall.
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* Now we know we could write if we wanted; remember that
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* and then go on. */
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e->canwrite=1;
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if (e->wantwrite) {
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e->next_write=first_writeable;
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first_writeable=y[i].data.fd;
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}
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}
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}
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if (newevents != curevents) {
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#if 0
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printf("canread %d, wantread %d, kernelwantread %d, canwrite %d, wantwrite %d, kernelwantwrite %d\n",
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e->canread,e->wantread,e->kernelwantread,e->canwrite,e->wantwrite,e->kernelwantwrite);
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printf("newevents: read %d write %d\n",!!(newevents&EPOLLIN),!!(newevents&EPOLLOUT));
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#endif
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y[i].events=newevents;
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if (newevents) {
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epoll_ctl(io_master,EPOLL_CTL_MOD,y[i].data.fd,y+i);
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} else {
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epoll_ctl(io_master,EPOLL_CTL_DEL,y[i].data.fd,y+i);
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--io_wanted_fds;
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}
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}
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} else {
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#if 0
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#ifdef __dietlibc__
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char buf[FMT_ULONG];
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buf[fmt_ulong(buf,y[i].data.fd)]=0;
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__write2("got epoll event on invalid fd ");
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__write2(buf);
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__write2("!\n");
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#endif
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#endif
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epoll_ctl(io_master,EPOLL_CTL_DEL,y[i].data.fd,y+i);
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}
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leitner
10 years ago