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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 "src/core/lib/iomgr/port.h"
#ifdef GRPC_UV
#include <uv.h>
#include <string.h>
#include <grpc/support/alloc.h>
#include <grpc/support/log.h>
#include <grpc/support/sync.h>
#include "src/core/lib/iomgr/iomgr_uv.h"
#include "src/core/lib/iomgr/pollset.h"
#include "src/core/lib/iomgr/pollset_uv.h"
#include "src/core/lib/debug/trace.h"
#ifndef NDEBUG
grpc_tracer_flag grpc_trace_fd_refcount =
GRPC_TRACER_INITIALIZER(false, "fd_refcount");
#endif
struct grpc_pollset {
uv_timer_t timer;
int shutting_down;
};
/* 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;
gpr_mu grpc_polling_mu;
/* This is used solely to kick the uv loop, by setting a callback to be run
immediately in the next loop iteration.
Note: In the future, if there is a bug that involves missing wakeups in the
future, try adding a uv_async_t to kick the loop differently */
uv_timer_t* dummy_uv_handle;
size_t grpc_pollset_size() { return sizeof(grpc_pollset); }
void dummy_timer_cb(uv_timer_t* handle) {}
void dummy_handle_close_cb(uv_handle_t* handle) { gpr_free(handle); }
void grpc_pollset_global_init(void) {
gpr_mu_init(&grpc_polling_mu);
dummy_uv_handle = (uv_timer_t*)gpr_malloc(sizeof(uv_timer_t));
uv_timer_init(uv_default_loop(), dummy_uv_handle);
grpc_pollset_work_run_loop = 1;
}
void grpc_pollset_global_shutdown(void) {
GRPC_UV_ASSERT_SAME_THREAD();
gpr_mu_destroy(&grpc_polling_mu);
uv_close((uv_handle_t*)dummy_uv_handle, dummy_handle_close_cb);
}
static void timer_run_cb(uv_timer_t* timer) {}
static void timer_close_cb(uv_handle_t* handle) { handle->data = (void*)1; }
void grpc_pollset_init(grpc_pollset* pollset, gpr_mu** mu) {
GRPC_UV_ASSERT_SAME_THREAD();
*mu = &grpc_polling_mu;
uv_timer_init(uv_default_loop(), &pollset->timer);
pollset->shutting_down = 0;
}
void grpc_pollset_shutdown(grpc_exec_ctx* exec_ctx, grpc_pollset* pollset,
grpc_closure* closure) {
GPR_ASSERT(!pollset->shutting_down);
GRPC_UV_ASSERT_SAME_THREAD();
pollset->shutting_down = 1;
if (grpc_pollset_work_run_loop) {
// Drain any pending UV callbacks without blocking
uv_run(uv_default_loop(), UV_RUN_NOWAIT);
} else {
// kick the loop once
uv_timer_start(dummy_uv_handle, dummy_timer_cb, 0, 0);
}
GRPC_CLOSURE_SCHED(exec_ctx, closure, GRPC_ERROR_NONE);
}
void grpc_pollset_destroy(grpc_exec_ctx* exec_ctx, grpc_pollset* pollset) {
GRPC_UV_ASSERT_SAME_THREAD();
uv_close((uv_handle_t*)&pollset->timer, timer_close_cb);
// timer.data is a boolean indicating that the timer has finished closing
pollset->timer.data = (void*)0;
if (grpc_pollset_work_run_loop) {
while (!pollset->timer.data) {
uv_run(uv_default_loop(), UV_RUN_NOWAIT);
}
}
}
grpc_error* grpc_pollset_work(grpc_exec_ctx* exec_ctx, grpc_pollset* pollset,
grpc_pollset_worker** worker_hdl,
grpc_millis deadline) {
uint64_t timeout;
GRPC_UV_ASSERT_SAME_THREAD();
gpr_mu_unlock(&grpc_polling_mu);
if (grpc_pollset_work_run_loop) {
grpc_millis now = grpc_exec_ctx_now(exec_ctx);
if (deadline >= now) {
timeout = deadline - now;
} else {
timeout = 0;
}
/* We special-case timeout=0 so that we don't bother with the timer when
the loop won't block anyway */
if (timeout > 0) {
uv_timer_start(&pollset->timer, timer_run_cb, timeout, 0);
/* Run until there is some I/O activity or the timer triggers. It doesn't
matter which happens */
uv_run(uv_default_loop(), UV_RUN_ONCE);
uv_timer_stop(&pollset->timer);
} else {
uv_run(uv_default_loop(), UV_RUN_NOWAIT);
}
}
if (!grpc_closure_list_empty(exec_ctx->closure_list)) {
grpc_exec_ctx_flush(exec_ctx);
}
gpr_mu_lock(&grpc_polling_mu);
return GRPC_ERROR_NONE;
}
grpc_error* grpc_pollset_kick(grpc_exec_ctx* exec_ctx, grpc_pollset* pollset,
grpc_pollset_worker* specific_worker) {
GRPC_UV_ASSERT_SAME_THREAD();
uv_timer_start(dummy_uv_handle, dummy_timer_cb, 0, 0);
return GRPC_ERROR_NONE;
}
#endif /* GRPC_UV */
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