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/*
*
* Copyright 2015 gRPC authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
#include "src/core/lib/iomgr/port.h"
#ifdef GRPC_WINSOCK_SOCKET
#include <grpc/support/log.h>
#include <grpc/support/thd.h>
#include "src/core/lib/iomgr/iocp_windows.h"
#include "src/core/lib/iomgr/iomgr_internal.h"
#include "src/core/lib/iomgr/pollset.h"
#include "src/core/lib/iomgr/pollset_windows.h"
#define GRPC_POLLSET_KICK_BROADCAST ((grpc_pollset_worker *)1)
#ifndef NDEBUG
grpc_tracer_flag grpc_trace_fd_refcount =
GRPC_TRACER_INITIALIZER(false, "fd_refcount");
#endif
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(void) {
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(void) { 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;
}
size_t grpc_pollset_size(void) { return sizeof(grpc_pollset); }
/* 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, gpr_mu **mu) {
*mu = &grpc_polling_mu;
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(exec_ctx, pollset, GRPC_POLLSET_KICK_BROADCAST);
if (!pollset->is_iocp_worker) {
GRPC_CLOSURE_SCHED(exec_ctx, closure, GRPC_ERROR_NONE);
} else {
pollset->on_shutdown = closure;
}
}
void grpc_pollset_destroy(grpc_exec_ctx *exec_ctx, grpc_pollset *pollset) {}
grpc_error *grpc_pollset_work(grpc_exec_ctx *exec_ctx, grpc_pollset *pollset,
grpc_pollset_worker **worker_hdl,
grpc_millis deadline) {
grpc_pollset_worker worker;
if (worker_hdl) *worker_hdl = &worker;
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 (!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_CLOSURE_SCHED(exec_ctx, pollset->on_shutdown, GRPC_ERROR_NONE);
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,
grpc_millis_to_timespec(deadline, GPR_CLOCK_REALTIME))) {
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);
if (worker_hdl) *worker_hdl = NULL;
return GRPC_ERROR_NONE;
}
grpc_error *grpc_pollset_kick(grpc_exec_ctx *exec_ctx, 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(exec_ctx, p, specific_worker);
} else if (p->is_iocp_worker) {
grpc_iocp_kick();
} else {
p->kicked_without_pollers = 1;
}
}
return GRPC_ERROR_NONE;
}
#endif /* GRPC_WINSOCK_SOCKET */
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