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/*
*
* Copyright 2016 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 <grpc/support/port_platform.h>
#include "src/core/lib/iomgr/port.h"
#ifdef GRPC_UV
#include <grpc/support/alloc.h>
#include <grpc/support/log.h>
#include "src/core/lib/iomgr/pollset_custom.h"
#include <uv.h>
/* Indicates that grpc_pollset_work should run an iteration of the UV loop
before running callbacks. This defaults to 1, and should be disabled if
grpc_pollset_work will be called within the callstack of uv_run */
int grpc_pollset_work_run_loop = 1;
static bool g_kicked = false;
typedef struct uv_poller_handle {
uv_timer_t poll_timer;
uv_timer_t kick_timer;
int refs;
} uv_poller_handle;
static uv_poller_handle* g_handle;
static void init() {
g_handle = (uv_poller_handle*)gpr_malloc(sizeof(uv_poller_handle));
g_handle->refs = 2;
uv_timer_init(uv_default_loop(), &g_handle->poll_timer);
uv_timer_init(uv_default_loop(), &g_handle->kick_timer);
}
static void empty_timer_cb(uv_timer_t* handle) {}
static void kick_timer_cb(uv_timer_t* handle) { g_kicked = false; }
static void run_loop(size_t timeout) {
if (grpc_pollset_work_run_loop) {
if (timeout == 0) {
uv_run(uv_default_loop(), UV_RUN_NOWAIT);
} else {
uv_timer_start(&g_handle->poll_timer, empty_timer_cb, timeout, 0);
uv_run(uv_default_loop(), UV_RUN_ONCE);
uv_timer_stop(&g_handle->poll_timer);
}
}
}
static void kick() {
if (!g_kicked) {
g_kicked = true;
uv_timer_start(&g_handle->kick_timer, kick_timer_cb, 0, 0);
}
}
static void close_timer_cb(uv_handle_t* handle) {
g_handle->refs--;
if (g_handle->refs == 0) {
gpr_free(g_handle);
}
}
static void shutdown() {
uv_close((uv_handle_t*)&g_handle->poll_timer, close_timer_cb);
uv_close((uv_handle_t*)&g_handle->kick_timer, close_timer_cb);
if (grpc_pollset_work_run_loop) {
GPR_ASSERT(uv_run(uv_default_loop(), UV_RUN_DEFAULT) == 0);
}
}
grpc_custom_poller_vtable uv_pollset_vtable = {init, run_loop, kick, shutdown};
#endif /* GRPC_UV */
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