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 if (sched_setaffinity(0, sizeof(cpuSet), &cpuSet) < 0) {
35 MEDIA_ERR_LOG("set thread affinity failed, errno %{public}d", errno);
36 }
37 }
38
ResetCpu()39 void CpuUtils::ResetCpu()
40 {
41 cpu_set_t cpuSet;
42 CPU_ZERO(&cpuSet);
43
44 if (sched_setaffinity(0, sizeof(cpuSet), &cpuSet) < 0) {
45 MEDIA_ERR_LOG("set thread affinity failed, errno %{public}d", errno);
46 return;
47 }
48 }
49
SetSelfThreadAffinity(CpuAffinityType cpuAffinityType)50 void CpuUtils::SetSelfThreadAffinity(CpuAffinityType cpuAffinityType)
51 {
52 if (cpuAffinityType < CpuAffinityType::CPU_IDX_0) {
53 return;
54 }
55
56 cpu_set_t cpuSet;
57 CPU_ZERO(&cpuSet);
58 for (int cpu = CpuAffinityType::CPU_IDX_0; cpu <= cpuAffinityType; cpu++) {
59 CPU_SET(cpu, &cpuSet);
60 }
61
62 if (pthread_setaffinity_np(pthread_self(), sizeof(cpuSet), &cpuSet) != 0) {
63 MEDIA_WARN_LOG("Set affinity failed, errno %{public}d, cpuAffinityType:%{public}d", errno, cpuAffinityType);
64 }
65 }
66
ResetSelfThreadAffinity()67 void CpuUtils::ResetSelfThreadAffinity()
68 {
69 cpu_set_t cpuSet;
70 CPU_ZERO(&cpuSet);
71 if (pthread_setaffinity_np(pthread_self(), sizeof(cpuSet), &cpuSet) != 0) {
72 MEDIA_WARN_LOG("Reset affinity failed, errno %{public}d", errno);
73 }
74 }
75 } // namespace Media
76 } // namespace OHOS
77