| /* |
| * |
| * Copyright 2014, 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. |
| * |
| */ |
| |
| #ifndef __GRPC_INTERNAL_IOMGR_POLLSET_POSIX_H_ |
| #define __GRPC_INTERNAL_IOMGR_POLLSET_POSIX_H_ |
| |
| #include <grpc/support/sync.h> |
| |
| #include "src/core/iomgr/pollset_kick.h" |
| |
| typedef struct grpc_pollset_vtable grpc_pollset_vtable; |
| |
| /* forward declare only in this file to avoid leaking impl details via |
| pollset.h; real users of grpc_fd should always include 'fd_posix.h' and not |
| use the struct tag */ |
| struct grpc_fd; |
| |
| typedef struct grpc_pollset { |
| /* pollsets under posix can mutate representation as fds are added and |
| removed. |
| For example, we may choose a poll() based implementation on linux for |
| few fds, and an epoll() based implementation for many fds */ |
| const grpc_pollset_vtable *vtable; |
| gpr_mu mu; |
| gpr_cv cv; |
| grpc_pollset_kick_state kick_state; |
| int counter; |
| union { |
| int fd; |
| void *ptr; |
| } data; |
| } grpc_pollset; |
| |
| struct grpc_pollset_vtable { |
| void (*add_fd)(grpc_pollset *pollset, struct grpc_fd *fd); |
| void (*del_fd)(grpc_pollset *pollset, struct grpc_fd *fd); |
| int (*maybe_work)(grpc_pollset *pollset, gpr_timespec deadline, |
| gpr_timespec now, int allow_synchronous_callback); |
| void (*destroy)(grpc_pollset *pollset); |
| }; |
| |
| #define GRPC_POLLSET_MU(pollset) (&(pollset)->mu) |
| #define GRPC_POLLSET_CV(pollset) (&(pollset)->cv) |
| |
| /* Add an fd to a pollset */ |
| void grpc_pollset_add_fd(grpc_pollset *pollset, struct grpc_fd *fd); |
| /* Force remove an fd from a pollset (normally they are removed on the next |
| poll after an fd is orphaned) */ |
| void grpc_pollset_del_fd(grpc_pollset *pollset, struct grpc_fd *fd); |
| |
| /* Force any current pollers to break polling */ |
| void grpc_pollset_force_kick(grpc_pollset *pollset); |
| /* Returns the fd to listen on for kicks */ |
| int grpc_kick_read_fd(grpc_pollset *p); |
| /* Call after polling has been kicked to leave the kicked state */ |
| void grpc_kick_drain(grpc_pollset *p); |
| |
| /* All fds get added to a backup pollset to ensure that progress is made |
| regardless of applications listening to events. Relying on this is slow |
| however (the backup pollset only listens every 100ms or so) - so it's not |
| to be relied on. */ |
| grpc_pollset *grpc_backup_pollset(void); |
| |
| /* turn a pollset into a multipoller: platform specific */ |
| void grpc_platform_become_multipoller(grpc_pollset *pollset, |
| struct grpc_fd **fds, size_t fd_count); |
| |
| #endif /* __GRPC_INTERNAL_IOMGR_POLLSET_POSIX_H_ */ |