1 /*
2 * Copyright (C) 2024 Huawei Device Co., Ltd.
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
16 #include "cpu_utils.h"
17
18 #include <cerrno>
19 #include <pthread.h>
20 #include <sched.h>
21 #include <unistd.h>
22
23 #include "media_log.h"
24
25 namespace OHOS {
26 namespace Media {
SlowDown()27 void CpuUtils::SlowDown()
28 {
29 cpu_set_t cpuSet;
30 CPU_ZERO(&cpuSet);
31 for (int cpu = CpuAffinityType::CPU_IDX_0; cpu <= CpuAffinityType::CPU_IDX_6; cpu++) {
32 CPU_SET(cpu, &cpuSet);
33 }
34 CHECK_AND_PRINT_LOG(sched_setaffinity(0, sizeof(cpuSet), &cpuSet) >= 0,
35 "set thread affinity failed, errno %{public}d", errno);
36 }
37
ResetCpu()38 void CpuUtils::ResetCpu()
39 {
40 cpu_set_t cpuSet;
41 CPU_ZERO(&cpuSet);
42 CHECK_AND_PRINT_LOG(sched_setaffinity(0, sizeof(cpuSet), &cpuSet) >= 0,
43 "set thread affinity failed, errno %{public}d", errno);
44 }
45
SetSelfThreadAffinity(CpuAffinityType cpuAffinityType)46 void CpuUtils::SetSelfThreadAffinity(CpuAffinityType cpuAffinityType)
47 {
48 if (cpuAffinityType < CpuAffinityType::CPU_IDX_0) {
49 return;
50 }
51
52 cpu_set_t cpuSet;
53 CPU_ZERO(&cpuSet);
54 for (int cpu = CpuAffinityType::CPU_IDX_0; cpu <= cpuAffinityType; cpu++) {
55 CPU_SET(cpu, &cpuSet);
56 }
57 CHECK_AND_WARN_LOG(pthread_setaffinity_np(pthread_self(), sizeof(cpuSet), &cpuSet) == 0,
58 "Set affinity failed, errno %{public}d, cpuAffinityType:%{public}d", errno, cpuAffinityType);
59 }
60
ResetSelfThreadAffinity()61 void CpuUtils::ResetSelfThreadAffinity()
62 {
63 cpu_set_t cpuSet;
64 CPU_ZERO(&cpuSet);
65 CHECK_AND_WARN_LOG(pthread_setaffinity_np(pthread_self(), sizeof(cpuSet), &cpuSet) == 0,
66 "Reset affinity failed, errno %{public}d", errno);
67 }
68 } // namespace Media
69 } // namespace OHOS
70