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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 = GPR_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