1 /*
2  * Copyright (C) 2023 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 #include <sys/types.h>  // pid_t
18 #include <mutex>
19 
20 #include "berberis/base/checks.h"
21 #include "berberis/base/forever_alloc.h"
22 #include "berberis/guest_os_primitives/guest_thread.h"
23 
24 #include "guest_thread_map.h"
25 
26 namespace berberis {
27 
GetInstance()28 GuestThreadMap* GuestThreadMap::GetInstance() {
29   static auto* g_guest_thread_map = NewForever<GuestThreadMap>();
30   return g_guest_thread_map;
31 }
32 
ResetThreadTable(pid_t tid,GuestThread * thread)33 void GuestThreadMap::ResetThreadTable(pid_t tid, GuestThread* thread) {
34   std::lock_guard<std::mutex> lock(mutex_);
35   map_.clear();
36   map_[tid] = thread;
37 }
38 
InsertThread(pid_t tid,GuestThread * thread)39 void GuestThreadMap::InsertThread(pid_t tid, GuestThread* thread) {
40   std::lock_guard<std::mutex> lock(mutex_);
41   auto result = map_.insert({tid, thread});
42   CHECK(result.second);
43 }
44 
RemoveThread(pid_t tid)45 GuestThread* GuestThreadMap::RemoveThread(pid_t tid) {
46   std::lock_guard<std::mutex> lock(mutex_);
47   auto it = map_.find(tid);
48   CHECK(it != map_.end());
49   GuestThread* thread = it->second;
50   map_.erase(it);
51   return thread;
52 }
53 
FindThread(pid_t tid)54 GuestThread* GuestThreadMap::FindThread(pid_t tid) {
55   std::lock_guard<std::mutex> lock(mutex_);
56   auto it = map_.find(tid);
57   if (it == map_.end()) {
58     return nullptr;
59   }
60   return it->second;
61 }
62 
63 }  // namespace berberis
64