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 #include "lock_parser.h"
16
17 #include <vector>
18
19 #include <pthread.h>
20
21 #include "dfx_log.h"
22 namespace OHOS {
23 namespace HiviewDFX {
24 namespace {
25 // defined in alltypes.h
26 #define DFX_MUTEX_TYPE u.i[0]
27 #define DFX_MUTEX_OWNER u.vi[1]
28 typedef struct {
29 union {
30 int i[sizeof(long) == 8 ? 10 : 6];
31 volatile int vi[sizeof(long) == 8 ? 10 : 6];
32 volatile void *volatile p[sizeof(long) == 8 ? 5 : 6];
33 } u;
34 } DfxMutex;
35 }
ParseLockInfo(std::shared_ptr<Unwinder> unwinder,int32_t vmPid,int32_t tid)36 bool LockParser::ParseLockInfo(std::shared_ptr<Unwinder> unwinder, int32_t vmPid, int32_t tid)
37 {
38 #ifdef __aarch64__
39 std::vector<char> buffer(sizeof(pthread_mutex_t), 0);
40 if (unwinder->GetLockInfo(vmPid, buffer.data(), sizeof(pthread_mutex_t))) {
41 auto mutexInfo = reinterpret_cast<DfxMutex*>(buffer.data());
42 // only PTHREAD_MUTEX_ERRORCHECK(2) type lock contains lock holder thread-id
43 // the normal type only store EBUSY in owner section
44 int type = mutexInfo->DFX_MUTEX_TYPE;
45 int owner = mutexInfo->DFX_MUTEX_OWNER & 0x3fffffff;
46 DFXLOG_INFO("Thread(%d) is waiting a lock with type %d held by %d", tid, type, owner);
47 return true;
48 }
49 return false;
50 #else
51 // not impl yet
52 return false;
53 #endif
54 }
55 } // namespace HiviewDFX
56 } // namespace OHOS
57