1 // Copyright 2021 gRPC authors.
2 //
3 // Licensed under the Apache License, Version 2.0 (the "License");
4 // you may not use this file except in compliance with the License.
5 // You may obtain a copy of the License at
6 //
7 //     http://www.apache.org/licenses/LICENSE-2.0
8 //
9 // Unless required by applicable law or agreed to in writing, software
10 // distributed under the License is distributed on an "AS IS" BASIS,
11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 // See the License for the specific language governing permissions and
13 // limitations under the License.
14 
15 #ifndef GRPC_SRC_CORE_LIB_PROMISE_EXEC_CTX_WAKEUP_SCHEDULER_H
16 #define GRPC_SRC_CORE_LIB_PROMISE_EXEC_CTX_WAKEUP_SCHEDULER_H
17 
18 #include <grpc/support/port_platform.h>
19 
20 #include "absl/status/status.h"
21 
22 #include "src/core/lib/gprpp/debug_location.h"
23 #include "src/core/lib/iomgr/closure.h"
24 #include "src/core/lib/iomgr/error.h"
25 #include "src/core/lib/iomgr/exec_ctx.h"
26 
27 namespace grpc_core {
28 
29 // A callback scheduler for activities that works by scheduling callbacks on the
30 // exec ctx.
31 class ExecCtxWakeupScheduler {
32  public:
33   template <typename ActivityType>
34   class BoundScheduler {
35    protected:
BoundScheduler(ExecCtxWakeupScheduler)36     explicit BoundScheduler(ExecCtxWakeupScheduler) {}
37     BoundScheduler(const BoundScheduler&) = delete;
38     BoundScheduler& operator=(const BoundScheduler&) = delete;
ScheduleWakeup()39     void ScheduleWakeup() {
40       GRPC_CLOSURE_INIT(
41           &closure_,
42           [](void* arg, grpc_error_handle) {
43             static_cast<ActivityType*>(arg)->RunScheduledWakeup();
44           },
45           static_cast<ActivityType*>(this), nullptr);
46       ExecCtx::Run(DEBUG_LOCATION, &closure_, absl::OkStatus());
47     }
48 
49    private:
50     grpc_closure closure_;
51   };
52 };
53 
54 }  // namespace grpc_core
55 
56 #endif  // GRPC_SRC_CORE_LIB_PROMISE_EXEC_CTX_WAKEUP_SCHEDULER_H
57