| /* |
| * |
| * 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. |
| * |
| */ |
| |
| #ifndef GRPC_CORE_LIB_IOMGR_CLOSURE_H |
| #define GRPC_CORE_LIB_IOMGR_CLOSURE_H |
| |
| #include <grpc/support/port_platform.h> |
| |
| #include <grpc/impl/codegen/exec_ctx_fwd.h> |
| #include <stdbool.h> |
| #include "src/core/lib/iomgr/error.h" |
| #include "src/core/lib/support/mpscq.h" |
| |
| struct grpc_closure; |
| typedef struct grpc_closure grpc_closure; |
| |
| typedef struct grpc_closure_list { |
| grpc_closure *head; |
| grpc_closure *tail; |
| } grpc_closure_list; |
| |
| /** gRPC Callback definition. |
| * |
| * \param arg Arbitrary input. |
| * \param error GRPC_ERROR_NONE if no error occurred, otherwise some grpc_error |
| * describing what went wrong */ |
| typedef void (*grpc_iomgr_cb_func)(grpc_exec_ctx *exec_ctx, void *arg, |
| grpc_error *error); |
| |
| typedef struct grpc_closure_scheduler grpc_closure_scheduler; |
| |
| typedef struct grpc_closure_scheduler_vtable { |
| /* NOTE: for all these functions, closure->scheduler == the scheduler that was |
| used to find this vtable */ |
| void (*run)(grpc_exec_ctx *exec_ctx, grpc_closure *closure, |
| grpc_error *error); |
| void (*sched)(grpc_exec_ctx *exec_ctx, grpc_closure *closure, |
| grpc_error *error); |
| const char *name; |
| } grpc_closure_scheduler_vtable; |
| |
| /** Abstract type that can schedule closures for execution */ |
| struct grpc_closure_scheduler { |
| const grpc_closure_scheduler_vtable *vtable; |
| }; |
| |
| /** A closure over a grpc_iomgr_cb_func. */ |
| struct grpc_closure { |
| /** Once queued, next indicates the next queued closure; before then, scratch |
| * space */ |
| union { |
| grpc_closure *next; |
| gpr_mpscq_node atm_next; |
| uintptr_t scratch; |
| } next_data; |
| |
| /** Bound callback. */ |
| grpc_iomgr_cb_func cb; |
| |
| /** Arguments to be passed to "cb". */ |
| void *cb_arg; |
| |
| /** Scheduler to schedule against: NULL to schedule against current execution |
| context */ |
| grpc_closure_scheduler *scheduler; |
| |
| /** Once queued, the result of the closure. Before then: scratch space */ |
| union { |
| grpc_error *error; |
| uintptr_t scratch; |
| } error_data; |
| |
| #ifndef NDEBUG |
| bool scheduled; |
| #endif |
| }; |
| |
| /** Initializes \a closure with \a cb and \a cb_arg. Returns \a closure. */ |
| grpc_closure *grpc_closure_init(grpc_closure *closure, grpc_iomgr_cb_func cb, |
| void *cb_arg, |
| grpc_closure_scheduler *scheduler); |
| |
| /* Create a heap allocated closure: try to avoid except for very rare events */ |
| grpc_closure *grpc_closure_create(grpc_iomgr_cb_func cb, void *cb_arg, |
| grpc_closure_scheduler *scheduler); |
| |
| #define GRPC_CLOSURE_LIST_INIT \ |
| { NULL, NULL } |
| |
| void grpc_closure_list_init(grpc_closure_list *list); |
| |
| /** add \a closure to the end of \a list |
| and set \a closure's result to \a error |
| Returns true if \a list becomes non-empty */ |
| bool grpc_closure_list_append(grpc_closure_list *list, grpc_closure *closure, |
| grpc_error *error); |
| |
| /** force all success bits in \a list to false */ |
| void grpc_closure_list_fail_all(grpc_closure_list *list, |
| grpc_error *forced_failure); |
| |
| /** append all closures from \a src to \a dst and empty \a src. */ |
| void grpc_closure_list_move(grpc_closure_list *src, grpc_closure_list *dst); |
| |
| /** return whether \a list is empty. */ |
| bool grpc_closure_list_empty(grpc_closure_list list); |
| |
| /** Run a closure directly. Caller ensures that no locks are being held above. |
| * Note that calling this at the end of a closure callback function itself is |
| * by definition safe. */ |
| void grpc_closure_run(grpc_exec_ctx *exec_ctx, grpc_closure *closure, |
| grpc_error *error); |
| |
| /** Schedule a closure to be run. Does not need to be run from a safe point. */ |
| void grpc_closure_sched(grpc_exec_ctx *exec_ctx, grpc_closure *closure, |
| grpc_error *error); |
| |
| /** Schedule all closures in a list to be run. Does not need to be run from a |
| * safe point. */ |
| void grpc_closure_list_sched(grpc_exec_ctx *exec_ctx, |
| grpc_closure_list *closure_list); |
| |
| #endif /* GRPC_CORE_LIB_IOMGR_CLOSURE_H */ |