1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
|
/*
* Copyright (C) 2015 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <pthread.h>
#include <stdint.h>
#include <string.h>
#include <sys/types.h>
#include <time.h>
#include <ucontext.h>
#include <chrono>
#include <unwindstack/Log.h>
#include "ThreadEntry.h"
namespace unwindstack {
std::mutex ThreadEntry::entries_mutex_;
std::map<pid_t, ThreadEntry*> ThreadEntry::entries_;
// Assumes that ThreadEntry::entries_mutex_ has already been locked before
// creating a ThreadEntry object.
ThreadEntry::ThreadEntry(pid_t tid) : tid_(tid), ref_count_(1), wait_value_(0) {
// Add ourselves to the global list.
entries_[tid_] = this;
}
ThreadEntry* ThreadEntry::Get(pid_t tid, bool create) {
ThreadEntry* entry = nullptr;
std::lock_guard<std::mutex> guard(entries_mutex_);
auto iter = entries_.find(tid);
if (iter == entries_.end()) {
if (create) {
entry = new ThreadEntry(tid);
}
} else {
entry = iter->second;
entry->ref_count_++;
}
return entry;
}
void ThreadEntry::Remove(ThreadEntry* entry) {
entry->Unlock();
std::lock_guard<std::mutex> guard(entries_mutex_);
if (--entry->ref_count_ == 0) {
delete entry;
}
}
// Assumes that ThreadEntry::entries_mutex_ has already been locked before
// deleting a ThreadEntry object.
ThreadEntry::~ThreadEntry() {
auto iter = entries_.find(tid_);
if (iter != entries_.end()) {
entries_.erase(iter);
}
}
const char* ThreadEntry::GetWaitTypeName(WaitType type) {
switch (type) {
case WAIT_FOR_UCONTEXT:
return "ucontext";
case WAIT_FOR_UNWIND_TO_COMPLETE:
return "unwind to complete";
case WAIT_FOR_THREAD_TO_RESTART:
return "thread to restart";
}
}
bool ThreadEntry::Wait(WaitType type) {
static const std::chrono::duration wait_time(std::chrono::seconds(10));
std::unique_lock<std::mutex> lock(wait_mutex_);
if (wait_cond_.wait_for(lock, wait_time, [this, type] { return wait_value_ == type; })) {
return true;
} else {
Log::AsyncSafe("Timeout waiting for %s", GetWaitTypeName(type));
return false;
}
}
void ThreadEntry::Wake() {
wait_mutex_.lock();
wait_value_++;
wait_mutex_.unlock();
wait_cond_.notify_one();
}
void ThreadEntry::CopyUcontextFromSigcontext(void* sigcontext) {
ucontext_t* ucontext = reinterpret_cast<ucontext_t*>(sigcontext);
// The only thing the unwinder cares about is the mcontext data.
memcpy(&ucontext_.uc_mcontext, &ucontext->uc_mcontext, sizeof(ucontext->uc_mcontext));
}
} // namespace unwindstack
|
