| /* |
| * |
| * 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, |
| gpr_timespec now, gpr_timespec deadline) { |
| uint64_t timeout; |
| GRPC_UV_ASSERT_SAME_THREAD(); |
| gpr_mu_unlock(&grpc_polling_mu); |
| if (grpc_pollset_work_run_loop) { |
| if (gpr_time_cmp(deadline, now) >= 0) { |
| timeout = (uint64_t)gpr_time_to_millis(gpr_time_sub(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 */ |