compat/linux/linux_event.c

683 	struct eventfd *efd;
696 	efd = malloc(sizeof(*efd), M_EPOLL, M_WAITOK | M_ZERO);
697 	efd->efd_flags = flags;
698 	efd->efd_count = initval;
699 	mtx_init(&efd->efd_lock, "eventfd", NULL, MTX_DEF);
701 	knlist_init_mtx(&efd->efd_sel.si_note, &efd->efd_lock);
707 	finit(fp, fflags, DTYPE_LINUXEFD, efd, &eventfdops);
736 	struct eventfd *efd;
738 	efd = fp->f_data;
739 	if (fp->f_type != DTYPE_LINUXEFD || efd == NULL)
742 	seldrain(&efd->efd_sel);
743 	knlist_destroy(&efd->efd_sel.si_note);
746 	mtx_destroy(&efd->efd_lock);
747 	free(efd, M_EPOLL);
756 	struct eventfd *efd;
760 	efd = fp->f_data;
761 	if (fp->f_type != DTYPE_LINUXEFD || efd == NULL)
768 	mtx_lock(&efd->efd_lock);
770 	if (efd->efd_count == 0) {
772 			mtx_unlock(&efd->efd_lock);
775 		error = mtx_sleep(&efd->efd_count, &efd->efd_lock, PCATCH, "lefdrd", 0);
780 		if ((efd->efd_flags & LINUX_EFD_SEMAPHORE) != 0) {
782 			--efd->efd_count;
784 			count = efd->efd_count;
785 			efd->efd_count = 0;
787 		KNOTE_LOCKED(&efd->efd_sel.si_note, 0);
788 		selwakeup(&efd->efd_sel);
789 		wakeup(&efd->efd_count);
790 		mtx_unlock(&efd->efd_lock);
793 		mtx_unlock(&efd->efd_lock);
802 	struct eventfd *efd;
806 	efd = fp->f_data;
807 	if (fp->f_type != DTYPE_LINUXEFD || efd == NULL)
819 	mtx_lock(&efd->efd_lock);
821 	if (UINT64_MAX - efd->efd_count <= count) {
823 			mtx_unlock(&efd->efd_lock);
828 		error = mtx_sleep(&efd->efd_count, &efd->efd_lock,
834 		efd->efd_count += count;
835 		KNOTE_LOCKED(&efd->efd_sel.si_note, 0);
836 		selwakeup(&efd->efd_sel);
837 		wakeup(&efd->efd_count);
839 	mtx_unlock(&efd->efd_lock);
848 	struct eventfd *efd;
851 	efd = fp->f_data;
852 	if (fp->f_type != DTYPE_LINUXEFD || efd == NULL)
855 	mtx_lock(&efd->efd_lock);
856 	if ((events & (POLLIN|POLLRDNORM)) && efd->efd_count > 0)
858 	if ((events & (POLLOUT|POLLWRNORM)) && UINT64_MAX - 1 > efd->efd_count)
861 		selrecord(td, &efd->efd_sel);
862 	mtx_unlock(&efd->efd_lock);
871 	struct eventfd *efd;
873 	efd = fp->f_data;
874 	if (fp->f_type != DTYPE_LINUXEFD || efd == NULL)
877 	mtx_lock(&efd->efd_lock);
886 		mtx_unlock(&efd->efd_lock);
890 	kn->kn_hook = efd;
891 	knlist_add(&efd->efd_sel.si_note, kn, 1);
892 	mtx_unlock(&efd->efd_lock);
900 	struct eventfd *efd = kn->kn_hook;
902 	mtx_lock(&efd->efd_lock);
903 	knlist_remove(&efd->efd_sel.si_note, kn, 1);
904 	mtx_unlock(&efd->efd_lock);
911 	struct eventfd *efd = kn->kn_hook;
914 	mtx_assert(&efd->efd_lock, MA_OWNED);
915 	ret = (efd->efd_count > 0);
924 	struct eventfd *efd = kn->kn_hook;
927 	mtx_assert(&efd->efd_lock, MA_OWNED);
928 	ret = (UINT64_MAX - 1 > efd->efd_count);