1 //
2 //
3 // Copyright 2017 gRPC authors.
4 //
5 // Licensed under the Apache License, Version 2.0 (the "License");
6 // you may not use this file except in compliance with the License.
7 // You may obtain a copy of the License at
8 //
9 // http://www.apache.org/licenses/LICENSE-2.0
10 //
11 // Unless required by applicable law or agreed to in writing, software
12 // distributed under the License is distributed on an "AS IS" BASIS,
13 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 // See the License for the specific language governing permissions and
15 // limitations under the License.
16 //
17 //
18
19 #include <grpc/support/port_platform.h>
20
21 #include <grpc/support/atm.h>
22
23 #include "src/core/lib/gpr/useful.h"
24
gpr_atm_no_barrier_clamped_add(gpr_atm * value,gpr_atm delta,gpr_atm min,gpr_atm max)25 gpr_atm gpr_atm_no_barrier_clamped_add(gpr_atm* value, gpr_atm delta,
26 gpr_atm min, gpr_atm max) {
27 gpr_atm current_value;
28 gpr_atm new_value;
29 do {
30 current_value = gpr_atm_no_barrier_load(value);
31 new_value = grpc_core::Clamp(current_value + delta, min, max);
32 if (new_value == current_value) break;
33 } while (!gpr_atm_no_barrier_cas(value, current_value, new_value));
34 return new_value;
35 }
36