| /* |
| * |
| * 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_POLLSET_H |
| #define GRPC_CORE_LIB_IOMGR_POLLSET_H |
| |
| #include <grpc/support/port_platform.h> |
| #include <grpc/support/sync.h> |
| #include <grpc/support/time.h> |
| |
| #include "src/core/lib/iomgr/exec_ctx.h" |
| |
| #ifndef NDEBUG |
| extern grpc_tracer_flag grpc_trace_fd_refcount; |
| #endif |
| |
| /* A grpc_pollset is a set of file descriptors that a higher level item is |
| interested in. For example: |
| - a server will typically keep a pollset containing all connected channels, |
| so that it can find new calls to service |
| - a completion queue might keep a pollset with an entry for each transport |
| that is servicing a call that it's tracking */ |
| |
| typedef struct grpc_pollset grpc_pollset; |
| typedef struct grpc_pollset_worker grpc_pollset_worker; |
| |
| size_t grpc_pollset_size(void); |
| /* Initialize a pollset: assumes *pollset contains all zeros */ |
| void grpc_pollset_init(grpc_pollset *pollset, gpr_mu **mu); |
| /* Begin shutting down the pollset, and call closure when done. |
| * pollset's mutex must be held */ |
| void grpc_pollset_shutdown(grpc_exec_ctx *exec_ctx, grpc_pollset *pollset, |
| grpc_closure *closure); |
| void grpc_pollset_destroy(grpc_exec_ctx *exec_ctx, grpc_pollset *pollset); |
| |
| /* Do some work on a pollset. |
| May involve invoking asynchronous callbacks, or actually polling file |
| descriptors. |
| Requires pollset's mutex locked. |
| May unlock its mutex during its execution. |
| |
| worker is a (platform-specific) handle that can be used to wake up |
| from grpc_pollset_work before any events are received and before the timeout |
| has expired. It is both initialized and destroyed by grpc_pollset_work. |
| Initialization of worker is guaranteed to occur BEFORE the |
| pollset's mutex is released for the first time by grpc_pollset_work |
| and it is guaranteed that it will not be released by grpc_pollset_work |
| AFTER worker has been destroyed. |
| |
| It's legal for worker to be NULL: in that case, this specific thread can not |
| be directly woken with a kick, but maybe be indirectly (with a kick against |
| the pollset as a whole). |
| |
| Tries not to block past deadline. |
| May call grpc_closure_list_run on grpc_closure_list, without holding the |
| pollset |
| lock */ |
| grpc_error *grpc_pollset_work(grpc_exec_ctx *exec_ctx, grpc_pollset *pollset, |
| grpc_pollset_worker **worker, gpr_timespec now, |
| gpr_timespec deadline) GRPC_MUST_USE_RESULT; |
| |
| /* Break one polling thread out of polling work for this pollset. |
| If specific_worker is non-NULL, then kick that worker. */ |
| grpc_error *grpc_pollset_kick(grpc_pollset *pollset, |
| grpc_pollset_worker *specific_worker) |
| GRPC_MUST_USE_RESULT; |
| |
| #endif /* GRPC_CORE_LIB_IOMGR_POLLSET_H */ |