1 | #ifndef __THREAD_MANAGER_HPP__ |
---|
2 | #define __THREAD_MANAGER_HPP__ |
---|
3 | |
---|
4 | #include <thread> // std::thread |
---|
5 | #include <mutex> // std::mutex, std::unique_lock |
---|
6 | #include <condition_variable> // std::condition_variable |
---|
7 | #include <map> |
---|
8 | |
---|
9 | |
---|
10 | namespace xios |
---|
11 | { |
---|
12 | class CThreadManager |
---|
13 | { |
---|
14 | private: |
---|
15 | |
---|
16 | struct SThreadInfo |
---|
17 | { |
---|
18 | std::thread* thread; |
---|
19 | std::thread::id previous; |
---|
20 | std::thread::id next; |
---|
21 | bool isNotified ; |
---|
22 | std::condition_variable* cvs ; |
---|
23 | std::unique_lock<std::mutex>* lck; |
---|
24 | bool finished ; |
---|
25 | bool isMainThread ; |
---|
26 | } ; |
---|
27 | |
---|
28 | |
---|
29 | static std::mutex* mtx_; |
---|
30 | static std::map<std::thread::id, SThreadInfo>* threads_; |
---|
31 | static std::thread::id masterThreadId_ ; |
---|
32 | static bool usingThreads_ ; |
---|
33 | |
---|
34 | public: |
---|
35 | |
---|
36 | static int getNumThreads(void) { return threads_->size()-1 ;} |
---|
37 | |
---|
38 | template <class Fn, class... Args> |
---|
39 | static void spawnThread(Fn&& fn, Args&&... args) |
---|
40 | { |
---|
41 | std::thread::id myId=std::this_thread::get_id() ; |
---|
42 | |
---|
43 | SThreadInfo myThreadInfo ; |
---|
44 | myThreadInfo.thread=nullptr ; |
---|
45 | myThreadInfo.previous = myId ; |
---|
46 | myThreadInfo.next = (*threads_)[myId].next ; |
---|
47 | myThreadInfo.cvs = new std::condition_variable() ; |
---|
48 | myThreadInfo.thread = new std::thread(fn, args...) ; |
---|
49 | myThreadInfo.finished = false ; |
---|
50 | myThreadInfo.isNotified = false ; |
---|
51 | (*threads_)[myThreadInfo.thread->get_id()] = myThreadInfo ; |
---|
52 | (*threads_)[(*threads_)[myId].next].previous = myThreadInfo.thread->get_id() ; |
---|
53 | (*threads_)[myId].next = myThreadInfo.thread->get_id() ; |
---|
54 | |
---|
55 | do (*threads_)[myId].cvs->wait(*((*threads_)[myId].lck)) ; |
---|
56 | while(!(*threads_)[myId].isNotified) ; |
---|
57 | |
---|
58 | (*threads_)[myId].isNotified=false ; |
---|
59 | } |
---|
60 | |
---|
61 | static void yield(void) |
---|
62 | { |
---|
63 | if (isMasterThread) checkJoin() ; |
---|
64 | std::thread::id id = std::this_thread::get_id() ; |
---|
65 | if (getNumThreads()>0) |
---|
66 | { |
---|
67 | (*threads_)[(*threads_)[id].next].isNotified=true ; |
---|
68 | (*threads_)[(*threads_)[id].next].cvs->notify_one() ; |
---|
69 | do (*threads_)[id].cvs->wait(*((*threads_)[id].lck)) ; |
---|
70 | while(!(*threads_)[id].isNotified) ; |
---|
71 | |
---|
72 | (*threads_)[id].isNotified=false ; |
---|
73 | |
---|
74 | } |
---|
75 | |
---|
76 | } |
---|
77 | |
---|
78 | static void checkJoin(void) |
---|
79 | { |
---|
80 | std::thread::id myId = std::this_thread::get_id() ; |
---|
81 | for(auto it=(*threads_).begin(); it!=(*threads_).end(); ) |
---|
82 | { |
---|
83 | if (it->first!=myId) |
---|
84 | { |
---|
85 | if (it->second.finished) |
---|
86 | { |
---|
87 | it->second.thread->join() ; |
---|
88 | it=(*threads_).erase(it) ; |
---|
89 | } |
---|
90 | else |
---|
91 | { |
---|
92 | it++ ; |
---|
93 | } |
---|
94 | } |
---|
95 | else it++ ; |
---|
96 | } |
---|
97 | } |
---|
98 | |
---|
99 | static bool isMasterThread(void) { return std::this_thread::get_id()==masterThreadId_; } |
---|
100 | static bool isUsingThreads(void) { return usingThreads_;} |
---|
101 | static void threadInitialize(void) |
---|
102 | { |
---|
103 | std::unique_lock<std::mutex>* lck = new std::unique_lock<std::mutex>(*mtx_); |
---|
104 | std::thread::id id=std::this_thread::get_id() ; |
---|
105 | |
---|
106 | (*threads_)[id].lck = lck ; |
---|
107 | (*threads_)[(*threads_)[id].previous].isNotified = true ; |
---|
108 | (*threads_)[(*threads_)[id].previous].cvs->notify_one() ; |
---|
109 | do (*threads_)[id].cvs->wait(*lck) ; while(!(*threads_)[id].isNotified) ; |
---|
110 | (*threads_)[id].isNotified=false ; |
---|
111 | } |
---|
112 | |
---|
113 | static void threadFinalize(void) |
---|
114 | { |
---|
115 | std::thread::id myId = std::this_thread::get_id() ; |
---|
116 | (*threads_)[(*threads_)[myId].previous].next = (*threads_)[myId].next; |
---|
117 | (*threads_)[(*threads_)[myId].next].previous = (*threads_)[myId].previous ; |
---|
118 | (*threads_)[myId].finished = true ; |
---|
119 | |
---|
120 | (*threads_)[(*threads_)[myId].next].isNotified=true ; |
---|
121 | (*threads_)[(*threads_)[myId].next].cvs->notify_one() ; |
---|
122 | |
---|
123 | delete (*threads_)[myId].lck ; |
---|
124 | } |
---|
125 | |
---|
126 | static void initialize(bool usingThreads) |
---|
127 | { |
---|
128 | mtx_ = new std::mutex ; |
---|
129 | threads_ = new std::map<std::thread::id, SThreadInfo> ; |
---|
130 | usingThreads_ = usingThreads ; |
---|
131 | |
---|
132 | std::thread::id myId= std::this_thread::get_id() ; |
---|
133 | SThreadInfo myThreadInfo ; |
---|
134 | myThreadInfo.thread=nullptr ; |
---|
135 | myThreadInfo.previous = myId ; |
---|
136 | myThreadInfo.next = myId ; |
---|
137 | myThreadInfo.cvs = new std::condition_variable() ; |
---|
138 | myThreadInfo.lck = new std::unique_lock<std::mutex>(*mtx_) ; |
---|
139 | myThreadInfo.finished = false ; |
---|
140 | myThreadInfo.isNotified = false ; |
---|
141 | (*threads_)[myId] = myThreadInfo ; |
---|
142 | } |
---|
143 | |
---|
144 | static void finalize(void) |
---|
145 | { |
---|
146 | |
---|
147 | std::thread::id myId = std::this_thread::get_id() ; |
---|
148 | delete (*threads_)[myId].lck ; |
---|
149 | delete threads_ ; |
---|
150 | delete mtx_ ; |
---|
151 | } |
---|
152 | }; |
---|
153 | |
---|
154 | } |
---|
155 | |
---|
156 | |
---|
157 | #endif |
---|