/* * * Copyright 2015, Google Inc. * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are * met: * * * Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * Redistributions in binary form must reproduce the above * copyright notice, this list of conditions and the following disclaimer * in the documentation and/or other materials provided with the * distribution. * * Neither the name of Google Inc. nor the names of its * contributors may be used to endorse or promote products derived from * this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * */ #include <grpc/support/port_platform.h> #ifdef GPR_LINUX_EVENTFD #include <errno.h> #include <sys/eventfd.h> #include <unistd.h> #include "src/core/iomgr/wakeup_fd_posix.h" #include <grpc/support/log.h> static void eventfd_create(grpc_wakeup_fd_info *fd_info) { int efd = eventfd(0, EFD_NONBLOCK | EFD_CLOEXEC); /* TODO(klempner): Handle failure more gracefully */ GPR_ASSERT(efd >= 0); fd_info->read_fd = efd; fd_info->write_fd = -1; } static void eventfd_consume(grpc_wakeup_fd_info *fd_info) { eventfd_t value; int err; do { err = eventfd_read(fd_info->read_fd, &value); } while (err < 0 && errno == EINTR); } static void eventfd_wakeup(grpc_wakeup_fd_info *fd_info) { int err; do { err = eventfd_write(fd_info->read_fd, 1); } while (err < 0 && errno == EINTR); } static void eventfd_destroy(grpc_wakeup_fd_info *fd_info) { close(fd_info->read_fd); } static int eventfd_check_availability(void) { /* TODO(klempner): Actually check if eventfd is available */ return 1; } const grpc_wakeup_fd_vtable grpc_specialized_wakeup_fd_vtable = { eventfd_create, eventfd_consume, eventfd_wakeup, eventfd_destroy, eventfd_check_availability }; #endif /* GPR_LINUX_EVENTFD */