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114 lines
2.9 KiB
C
114 lines
2.9 KiB
C
#include <unistd.h>
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#include <fcntl.h>
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#include <errno.h>
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#include "io_internal.h"
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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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#ifdef HAVE_EPOLL
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#include <inttypes.h>
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#include <sys/epoll.h>
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#include <byte.h>
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#endif
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#ifdef HAVE_SIGIO
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#include <sys/poll.h>
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#endif
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#ifdef HAVE_DEVPOLL
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <sys/devpoll.h>
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#endif
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#ifdef DEBUG
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#include <assert.h>
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#else
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#define assert(x)
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#endif
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/* IDEA: if someone calls io_dontwantwrite, do not do the syscall to
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* tell the kernel about it. Only when a write event comes in and the
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* user has told us he does not want them, THEN tell the kernel we are
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* not interested. In the typical protocol case of "write request, read
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* reply", this should save a lot of syscalls.
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* Now, if someone calls io_wantwrite, we might be in the situation that
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* canwrite is already set. In that case, just enqueue the fd. */
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void io_wantwrite_really(int64 d, io_entry* e) {
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int newfd;
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assert(!e->kernelwantwrite); /* we should not be here if we already told the kernel we want to write */
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newfd=(!e->kernelwantread);
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io_wanted_fds+=newfd;
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#ifdef HAVE_EPOLL
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if (io_waitmode==EPOLL) {
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struct epoll_event x;
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byte_zero(&x,sizeof(x)); // to shut up valgrind
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x.events=EPOLLOUT;
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if (e->kernelwantread) x.events|=EPOLLIN;
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x.data.fd=d;
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epoll_ctl(io_master,e->kernelwantread?EPOLL_CTL_MOD:EPOLL_CTL_ADD,d,&x);
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}
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#endif
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#ifdef HAVE_KQUEUE
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if (io_waitmode==KQUEUE) {
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struct kevent kev;
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struct timespec ts;
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EV_SET(&kev, d, EVFILT_WRITE, EV_ADD|EV_ENABLE, 0, 0, 0);
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ts.tv_sec=0; ts.tv_nsec=0;
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kevent(io_master,&kev,1,0,0,&ts);
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}
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#endif
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#ifdef HAVE_DEVPOLL
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if (io_waitmode==DEVPOLL) {
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struct pollfd x;
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x.fd=d;
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x.events=POLLOUT;
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if (e->wantread) x.events|=POLLIN;
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write(io_master,&x,sizeof(x));
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}
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#endif
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#ifdef HAVE_SIGIO
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if (io_waitmode==_SIGIO) {
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struct pollfd p;
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p.fd=d;
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p.events=POLLOUT;
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switch (poll(&p,1,0)) {
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case 1: e->canwrite=1; break;
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case 0: e->canwrite=0; break;
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case -1: return;
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}
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if (e->canwrite) {
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debug_printf(("io_wantwrite: enqueueing %lld in normal write queue before %ld\n",d,first_readable));
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e->next_write=first_writeable;
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first_writeable=d;
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}
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}
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#endif
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#ifdef __MINGW32__
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printf("e->wantwrite == %d\n",e->wantwrite);
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if (!e->wantwrite) {
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e->next_write=first_writeable;
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e->canwrite=1;
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first_writeable=d;
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printf("queueing write, setting first_writeable to %lld\n",d);
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}
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#endif
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e->wantwrite=1;
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e->kernelwantwrite=1;
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}
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void io_wantwrite(int64 d) {
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io_entry* e=iarray_get(&io_fds,d);
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if (!e) return;
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if (e->wantwrite && e->kernelwantwrite) return;
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if (e->canwrite) {
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e->next_write=first_writeable;
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first_writeable=d;
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e->wantwrite=1;
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return;
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}
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/* the harder case: do as before */
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if (!e->kernelwantwrite) io_wantwrite_really(d, e); else e->wantwrite=1;
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}
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