| /* |
| * |
| * Copyright 2015-2016, 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 <grpc/support/port_platform.h> |
| |
| #ifdef GPR_WINSOCK_SOCKET |
| |
| #include <grpc/support/log.h> |
| #include <grpc/support/thd.h> |
| |
| #include "src/core/iomgr/timer_internal.h" |
| #include "src/core/iomgr/iomgr_internal.h" |
| #include "src/core/iomgr/iocp_windows.h" |
| #include "src/core/iomgr/pollset.h" |
| #include "src/core/iomgr/pollset_windows.h" |
| |
| gpr_mu grpc_polling_mu; |
| static grpc_pollset_worker *g_active_poller; |
| static grpc_pollset_worker g_global_root_worker; |
| |
| void grpc_pollset_global_init() { |
| gpr_mu_init(&grpc_polling_mu); |
| g_active_poller = NULL; |
| g_global_root_worker.links[GRPC_POLLSET_WORKER_LINK_GLOBAL].next = |
| g_global_root_worker.links[GRPC_POLLSET_WORKER_LINK_GLOBAL].prev = |
| &g_global_root_worker; |
| } |
| |
| void grpc_pollset_global_shutdown() { gpr_mu_destroy(&grpc_polling_mu); } |
| |
| static void remove_worker(grpc_pollset_worker *worker, |
| grpc_pollset_worker_link_type type) { |
| worker->links[type].prev->links[type].next = worker->links[type].next; |
| worker->links[type].next->links[type].prev = worker->links[type].prev; |
| worker->links[type].next = worker->links[type].prev = worker; |
| } |
| |
| static int has_workers(grpc_pollset_worker *root, |
| grpc_pollset_worker_link_type type) { |
| return root->links[type].next != root; |
| } |
| |
| static grpc_pollset_worker *pop_front_worker( |
| grpc_pollset_worker *root, grpc_pollset_worker_link_type type) { |
| if (has_workers(root, type)) { |
| grpc_pollset_worker *w = root->links[type].next; |
| remove_worker(w, type); |
| return w; |
| } else { |
| return NULL; |
| } |
| } |
| |
| static void push_front_worker(grpc_pollset_worker *root, |
| grpc_pollset_worker_link_type type, |
| grpc_pollset_worker *worker) { |
| worker->links[type].prev = root; |
| worker->links[type].next = worker->links[type].prev->links[type].next; |
| worker->links[type].prev->links[type].next = |
| worker->links[type].next->links[type].prev = worker; |
| } |
| |
| /* There isn't really any such thing as a pollset under Windows, due to the |
| nature of the IO completion ports. We're still going to provide a minimal |
| set of features for the sake of the rest of grpc. But grpc_pollset_work |
| won't actually do any polling, and return as quickly as possible. */ |
| |
| void grpc_pollset_init(grpc_pollset *pollset) { |
| memset(pollset, 0, sizeof(*pollset)); |
| pollset->root_worker.links[GRPC_POLLSET_WORKER_LINK_POLLSET].next = |
| pollset->root_worker.links[GRPC_POLLSET_WORKER_LINK_POLLSET].prev = |
| &pollset->root_worker; |
| } |
| |
| void grpc_pollset_shutdown(grpc_exec_ctx *exec_ctx, grpc_pollset *pollset, |
| grpc_closure *closure) { |
| pollset->shutting_down = 1; |
| grpc_pollset_kick(pollset, GRPC_POLLSET_KICK_BROADCAST); |
| if (!pollset->is_iocp_worker) { |
| grpc_exec_ctx_enqueue(exec_ctx, closure, true, NULL); |
| } else { |
| pollset->on_shutdown = closure; |
| } |
| } |
| |
| void grpc_pollset_destroy(grpc_pollset *pollset) {} |
| |
| void grpc_pollset_reset(grpc_pollset *pollset) { |
| GPR_ASSERT(pollset->shutting_down); |
| GPR_ASSERT( |
| !has_workers(&pollset->root_worker, GRPC_POLLSET_WORKER_LINK_POLLSET)); |
| pollset->shutting_down = 0; |
| pollset->is_iocp_worker = 0; |
| pollset->kicked_without_pollers = 0; |
| pollset->on_shutdown = NULL; |
| } |
| |
| void grpc_pollset_work(grpc_exec_ctx *exec_ctx, grpc_pollset *pollset, |
| grpc_pollset_worker *worker, gpr_timespec now, |
| gpr_timespec deadline) { |
| int added_worker = 0; |
| worker->links[GRPC_POLLSET_WORKER_LINK_POLLSET].next = |
| worker->links[GRPC_POLLSET_WORKER_LINK_POLLSET].prev = |
| worker->links[GRPC_POLLSET_WORKER_LINK_GLOBAL].next = |
| worker->links[GRPC_POLLSET_WORKER_LINK_GLOBAL].prev = NULL; |
| worker->kicked = 0; |
| worker->pollset = pollset; |
| gpr_cv_init(&worker->cv); |
| if (grpc_timer_check(exec_ctx, now, &deadline)) { |
| goto done; |
| } |
| if (!pollset->kicked_without_pollers && !pollset->shutting_down) { |
| if (g_active_poller == NULL) { |
| grpc_pollset_worker *next_worker; |
| /* become poller */ |
| pollset->is_iocp_worker = 1; |
| g_active_poller = worker; |
| gpr_mu_unlock(&grpc_polling_mu); |
| grpc_iocp_work(exec_ctx, deadline); |
| grpc_exec_ctx_flush(exec_ctx); |
| gpr_mu_lock(&grpc_polling_mu); |
| pollset->is_iocp_worker = 0; |
| g_active_poller = NULL; |
| /* try to get a worker from this pollsets worker list */ |
| next_worker = pop_front_worker(&pollset->root_worker, |
| GRPC_POLLSET_WORKER_LINK_POLLSET); |
| if (next_worker == NULL) { |
| /* try to get a worker from the global list */ |
| next_worker = pop_front_worker(&g_global_root_worker, |
| GRPC_POLLSET_WORKER_LINK_GLOBAL); |
| } |
| if (next_worker != NULL) { |
| next_worker->kicked = 1; |
| gpr_cv_signal(&next_worker->cv); |
| } |
| |
| if (pollset->shutting_down && pollset->on_shutdown != NULL) { |
| grpc_exec_ctx_enqueue(exec_ctx, pollset->on_shutdown, true, NULL); |
| pollset->on_shutdown = NULL; |
| } |
| goto done; |
| } |
| push_front_worker(&g_global_root_worker, GRPC_POLLSET_WORKER_LINK_GLOBAL, |
| worker); |
| push_front_worker(&pollset->root_worker, GRPC_POLLSET_WORKER_LINK_POLLSET, |
| worker); |
| added_worker = 1; |
| while (!worker->kicked) { |
| if (gpr_cv_wait(&worker->cv, &grpc_polling_mu, deadline)) { |
| break; |
| } |
| } |
| } else { |
| pollset->kicked_without_pollers = 0; |
| } |
| done: |
| if (!grpc_closure_list_empty(exec_ctx->closure_list)) { |
| gpr_mu_unlock(&grpc_polling_mu); |
| grpc_exec_ctx_flush(exec_ctx); |
| gpr_mu_lock(&grpc_polling_mu); |
| } |
| if (added_worker) { |
| remove_worker(worker, GRPC_POLLSET_WORKER_LINK_GLOBAL); |
| remove_worker(worker, GRPC_POLLSET_WORKER_LINK_POLLSET); |
| } |
| gpr_cv_destroy(&worker->cv); |
| } |
| |
| void grpc_pollset_kick(grpc_pollset *p, grpc_pollset_worker *specific_worker) { |
| if (specific_worker != NULL) { |
| if (specific_worker == GRPC_POLLSET_KICK_BROADCAST) { |
| for (specific_worker = |
| p->root_worker.links[GRPC_POLLSET_WORKER_LINK_POLLSET].next; |
| specific_worker != &p->root_worker; |
| specific_worker = |
| specific_worker->links[GRPC_POLLSET_WORKER_LINK_POLLSET].next) { |
| specific_worker->kicked = 1; |
| gpr_cv_signal(&specific_worker->cv); |
| } |
| p->kicked_without_pollers = 1; |
| if (p->is_iocp_worker) { |
| grpc_iocp_kick(); |
| } |
| } else { |
| if (p->is_iocp_worker && g_active_poller == specific_worker) { |
| grpc_iocp_kick(); |
| } else { |
| specific_worker->kicked = 1; |
| gpr_cv_signal(&specific_worker->cv); |
| } |
| } |
| } else { |
| specific_worker = |
| pop_front_worker(&p->root_worker, GRPC_POLLSET_WORKER_LINK_POLLSET); |
| if (specific_worker != NULL) { |
| grpc_pollset_kick(p, specific_worker); |
| } else if (p->is_iocp_worker) { |
| grpc_iocp_kick(); |
| } else { |
| p->kicked_without_pollers = 1; |
| } |
| } |
| } |
| |
| void grpc_kick_poller(void) { grpc_iocp_kick(); } |
| |
| #endif /* GPR_WINSOCK_SOCKET */ |