| /* |
| * |
| * 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. |
| * |
| */ |
| |
| #include "src/core/lib/iomgr/port.h" |
| |
| #ifdef GRPC_POSIX_WAKEUP_FD |
| |
| #include "src/core/lib/iomgr/wakeup_fd_cv.h" |
| |
| #include <errno.h> |
| #include <string.h> |
| |
| #include <grpc/support/alloc.h> |
| #include <grpc/support/log.h> |
| #include <grpc/support/sync.h> |
| #include <grpc/support/thd.h> |
| #include <grpc/support/time.h> |
| #include <grpc/support/useful.h> |
| |
| #define MAX_TABLE_RESIZE 256 |
| |
| extern cv_fd_table g_cvfds; |
| |
| static grpc_error* cv_fd_init(grpc_wakeup_fd* fd_info) { |
| unsigned int i, newsize; |
| int idx; |
| gpr_mu_lock(&g_cvfds.mu); |
| if (!g_cvfds.free_fds) { |
| newsize = GPR_MIN(g_cvfds.size * 2, g_cvfds.size + MAX_TABLE_RESIZE); |
| g_cvfds.cvfds = gpr_realloc(g_cvfds.cvfds, sizeof(fd_node) * newsize); |
| for (i = g_cvfds.size; i < newsize; i++) { |
| g_cvfds.cvfds[i].is_set = 0; |
| g_cvfds.cvfds[i].cvs = NULL; |
| g_cvfds.cvfds[i].next_free = g_cvfds.free_fds; |
| g_cvfds.free_fds = &g_cvfds.cvfds[i]; |
| } |
| g_cvfds.size = newsize; |
| } |
| |
| idx = (int)(g_cvfds.free_fds - g_cvfds.cvfds); |
| g_cvfds.free_fds = g_cvfds.free_fds->next_free; |
| g_cvfds.cvfds[idx].cvs = NULL; |
| g_cvfds.cvfds[idx].is_set = 0; |
| fd_info->read_fd = IDX_TO_FD(idx); |
| fd_info->write_fd = -1; |
| gpr_mu_unlock(&g_cvfds.mu); |
| return GRPC_ERROR_NONE; |
| } |
| |
| static grpc_error* cv_fd_wakeup(grpc_wakeup_fd* fd_info) { |
| cv_node* cvn; |
| gpr_mu_lock(&g_cvfds.mu); |
| g_cvfds.cvfds[FD_TO_IDX(fd_info->read_fd)].is_set = 1; |
| cvn = g_cvfds.cvfds[FD_TO_IDX(fd_info->read_fd)].cvs; |
| while (cvn) { |
| gpr_cv_signal(cvn->cv); |
| cvn = cvn->next; |
| } |
| gpr_mu_unlock(&g_cvfds.mu); |
| return GRPC_ERROR_NONE; |
| } |
| |
| static grpc_error* cv_fd_consume(grpc_wakeup_fd* fd_info) { |
| gpr_mu_lock(&g_cvfds.mu); |
| g_cvfds.cvfds[FD_TO_IDX(fd_info->read_fd)].is_set = 0; |
| gpr_mu_unlock(&g_cvfds.mu); |
| return GRPC_ERROR_NONE; |
| } |
| |
| static void cv_fd_destroy(grpc_wakeup_fd* fd_info) { |
| if (fd_info->read_fd == 0) { |
| return; |
| } |
| gpr_mu_lock(&g_cvfds.mu); |
| // Assert that there are no active pollers |
| GPR_ASSERT(!g_cvfds.cvfds[FD_TO_IDX(fd_info->read_fd)].cvs); |
| g_cvfds.cvfds[FD_TO_IDX(fd_info->read_fd)].next_free = g_cvfds.free_fds; |
| g_cvfds.free_fds = &g_cvfds.cvfds[FD_TO_IDX(fd_info->read_fd)]; |
| gpr_mu_unlock(&g_cvfds.mu); |
| } |
| |
| static int cv_check_availability(void) { return 1; } |
| |
| const grpc_wakeup_fd_vtable grpc_cv_wakeup_fd_vtable = { |
| cv_fd_init, cv_fd_consume, cv_fd_wakeup, cv_fd_destroy, |
| cv_check_availability}; |
| |
| #endif /* GRPC_POSIX_WAKUP_FD */ |