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/*
*
* Copyright 2015, 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/thd.h>
#include "src/core/iomgr/alarm_internal.h"
#include "src/core/iomgr/iomgr_internal.h"
#include "src/core/iomgr/pollset.h"
#include "src/core/iomgr/pollset_windows.h"
static void remove_worker(grpc_pollset *p, grpc_pollset_worker *worker) {
worker->prev->next = worker->next;
worker->next->prev = worker->prev;
}
static int has_workers(grpc_pollset *p) {
return p->root_worker.next != &p->root_worker;
}
static grpc_pollset_worker *pop_front_worker(grpc_pollset *p) {
if (has_workers(p)) {
grpc_pollset_worker *w = p->root_worker.next;
remove_worker(p, w);
return w;
} else {
return NULL;
}
}
static void push_back_worker(grpc_pollset *p, grpc_pollset_worker *worker) {
worker->next = &p->root_worker;
worker->prev = worker->next->prev;
worker->prev->next = worker->next->prev = worker;
}
static void push_front_worker(grpc_pollset *p, grpc_pollset_worker *worker) {
worker->prev = &p->root_worker;
worker->next = worker->prev->next;
worker->prev->next = worker->next->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));
gpr_mu_init(&pollset->mu);
pollset->root_worker.next = pollset->root_worker.prev = &pollset->root_worker;
pollset->kicked_without_pollers = 0;
}
void grpc_pollset_shutdown(grpc_pollset *pollset,
void (*shutdown_done)(void *arg),
void *shutdown_done_arg) {
gpr_mu_lock(&pollset->mu);
pollset->shutting_down = 1;
grpc_pollset_kick(pollset, GRPC_POLLSET_KICK_BROADCAST);
gpr_mu_unlock(&pollset->mu);
shutdown_done(shutdown_done_arg);
}
void grpc_pollset_destroy(grpc_pollset *pollset) {
gpr_mu_destroy(&pollset->mu);
}
void grpc_pollset_work(grpc_pollset *pollset, grpc_pollset_worker *worker,
gpr_timespec now, gpr_timespec deadline) {
int added_worker = 0;
worker->next = worker->prev = NULL;
gpr_cv_init(&worker->cv);
if (grpc_maybe_call_delayed_callbacks(&pollset->mu, 1 /* GPR_TRUE */)) {
goto done;
}
if (grpc_alarm_check(&pollset->mu, now, &deadline)) {
goto done;
}
if (!pollset->kicked_without_pollers && !pollset->shutting_down) {
push_front_worker(pollset, worker);
added_worker = 1;
gpr_cv_wait(&worker->cv, &pollset->mu, deadline);
} else {
pollset->kicked_without_pollers = 0;
}
done:
gpr_cv_destroy(&worker->cv);
if (added_worker) {
remove_worker(pollset, worker);
}
}
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.next;
specific_worker != &p->root_worker;
specific_worker = specific_worker->next) {
gpr_cv_signal(&specific_worker->cv);
}
p->kicked_without_pollers = 1;
} else {
gpr_cv_signal(&specific_worker->cv);
}
} else {
specific_worker = pop_front_worker(p);
if (specific_worker != NULL) {
push_back_worker(p, specific_worker);
gpr_cv_signal(&specific_worker->cv);
} else {
p->kicked_without_pollers = 1;
}
}
}
#endif /* GPR_WINSOCK_SOCKET */
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