| /* |
| * |
| * Copyright 2016, 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. |
| * |
| */ |
| |
| /* |
| * wakeup_fd_cv uses condition variables to implement wakeup fds. |
| * |
| * It is intended for use only in cases when eventfd() and pipe() are not |
| * available. It can only be used with the "poll" engine. |
| * |
| * Implementation: |
| * A global table of cv wakeup fds is mantained. A cv wakeup fd is a negative |
| * file descriptor. poll() is then run in a background thread with only the |
| * real socket fds while we wait on a condition variable trigged by either the |
| * poll() completion or a wakeup_fd() call. |
| * |
| */ |
| |
| #ifndef GRPC_CORE_LIB_IOMGR_WAKEUP_FD_CV_H |
| #define GRPC_CORE_LIB_IOMGR_WAKEUP_FD_CV_H |
| |
| #include <grpc/support/sync.h> |
| |
| #include "src/core/lib/iomgr/ev_posix.h" |
| |
| #define FD_TO_IDX(fd) (-(fd)-1) |
| #define IDX_TO_FD(idx) (-(idx)-1) |
| |
| typedef struct cv_node { |
| gpr_cv* cv; |
| struct cv_node* next; |
| } cv_node; |
| |
| typedef struct fd_node { |
| int is_set; |
| cv_node* cvs; |
| struct fd_node* next_free; |
| } fd_node; |
| |
| typedef struct cv_fd_table { |
| gpr_mu mu; |
| int pollcount; |
| int shutdown; |
| gpr_cv shutdown_complete; |
| fd_node* cvfds; |
| fd_node* free_fds; |
| unsigned int size; |
| grpc_poll_function_type poll; |
| } cv_fd_table; |
| |
| #endif /* GRPC_CORE_LIB_IOMGR_WAKEUP_FD_CV_H */ |