rev |
line source |
nuclear@26
|
1 #include <algorithm>
|
nuclear@26
|
2 #include <chrono>
|
nuclear@26
|
3 #include "threadpool.h"
|
nuclear@26
|
4
|
nuclear@26
|
5 using namespace std::chrono;
|
nuclear@26
|
6
|
nuclear@26
|
7 ThreadPool::ThreadPool(int num_threads)
|
nuclear@26
|
8 {
|
nuclear@26
|
9 quit = false;
|
nuclear@26
|
10 qsize = 0;
|
nuclear@26
|
11 nactive = 0;
|
nuclear@26
|
12
|
nuclear@26
|
13 if(num_threads == -1) {
|
nuclear@26
|
14 num_threads = std::thread::hardware_concurrency();
|
nuclear@26
|
15 }
|
nuclear@26
|
16
|
nuclear@26
|
17 printf("creating thread pool with %d threads\n", num_threads);
|
nuclear@26
|
18
|
nuclear@26
|
19 thread = new std::thread[num_threads];
|
nuclear@26
|
20 for(int i=0; i<num_threads; i++) {
|
nuclear@26
|
21 thread[i] = std::thread(&ThreadPool::thread_func, this);
|
nuclear@31
|
22
|
nuclear@31
|
23 #ifdef _MSC_VER
|
nuclear@31
|
24 /* detach the thread to avoid having to join them in the destructor, which
|
nuclear@31
|
25 * causes a deadlock in msvc implementation when called after main returns
|
nuclear@31
|
26 */
|
nuclear@31
|
27 thread[i].detach();
|
nuclear@31
|
28 #endif
|
nuclear@26
|
29 }
|
nuclear@26
|
30 this->num_threads = num_threads;
|
nuclear@26
|
31 }
|
nuclear@26
|
32
|
nuclear@26
|
33 ThreadPool::~ThreadPool()
|
nuclear@26
|
34 {
|
nuclear@31
|
35 #ifdef _MSC_VER
|
nuclear@31
|
36 workq_mutex.lock();
|
nuclear@31
|
37 workq.clear();
|
nuclear@31
|
38 qsize = 0;
|
nuclear@31
|
39 workq_mutex.unlock();
|
nuclear@31
|
40 #endif
|
nuclear@31
|
41
|
nuclear@26
|
42 quit = true;
|
nuclear@26
|
43 workq_condvar.notify_all();
|
nuclear@26
|
44
|
nuclear@26
|
45 printf("ThreadPool: waiting for %d worker threads to stop ", num_threads);
|
nuclear@26
|
46 fflush(stdout);
|
nuclear@31
|
47 #ifndef _MSC_VER
|
nuclear@26
|
48 for(int i=0; i<num_threads; i++) {
|
nuclear@26
|
49 thread[i].join();
|
nuclear@26
|
50 putchar('.');
|
nuclear@26
|
51 fflush(stdout);
|
nuclear@26
|
52 }
|
nuclear@31
|
53 #else
|
nuclear@31
|
54 // spin until all threads are done...
|
nuclear@31
|
55 std::unique_lock<std::mutex> lock(workq_mutex);
|
nuclear@31
|
56 while(nactive > 0) {
|
nuclear@31
|
57 lock.unlock();
|
nuclear@31
|
58 std::this_thread::sleep_for(std::chrono::milliseconds(128));
|
nuclear@31
|
59 putchar('.');
|
nuclear@31
|
60 fflush(stdout);
|
nuclear@31
|
61 lock.lock();
|
nuclear@31
|
62 }
|
nuclear@31
|
63 #endif // _MSC_VER
|
nuclear@31
|
64
|
nuclear@26
|
65 putchar('\n');
|
nuclear@31
|
66 delete [] thread;
|
nuclear@26
|
67 }
|
nuclear@26
|
68
|
nuclear@26
|
69 void ThreadPool::add_work(std::function<void ()> func)
|
nuclear@26
|
70 {
|
nuclear@26
|
71 add_work(func, std::function<void ()>{});
|
nuclear@26
|
72 }
|
nuclear@26
|
73
|
nuclear@26
|
74 void ThreadPool::add_work(std::function<void ()> work_func, std::function<void ()> done_func)
|
nuclear@26
|
75 {
|
nuclear@26
|
76 std::unique_lock<std::mutex> lock(workq_mutex);
|
nuclear@26
|
77 workq.push_back(WorkItem{work_func, done_func});
|
nuclear@26
|
78 ++qsize;
|
nuclear@26
|
79 workq_condvar.notify_all();
|
nuclear@26
|
80 }
|
nuclear@26
|
81
|
nuclear@26
|
82 int ThreadPool::queued() const
|
nuclear@26
|
83 {
|
nuclear@26
|
84 std::unique_lock<std::mutex> lock(workq_mutex);
|
nuclear@26
|
85 return qsize;
|
nuclear@26
|
86 }
|
nuclear@26
|
87
|
nuclear@26
|
88 int ThreadPool::active() const
|
nuclear@26
|
89 {
|
nuclear@26
|
90 std::unique_lock<std::mutex> lock(workq_mutex);
|
nuclear@26
|
91 return nactive;
|
nuclear@26
|
92 }
|
nuclear@26
|
93
|
nuclear@26
|
94 int ThreadPool::pending() const
|
nuclear@26
|
95 {
|
nuclear@26
|
96 std::unique_lock<std::mutex> lock(workq_mutex);
|
nuclear@26
|
97 return nactive + qsize;
|
nuclear@26
|
98 }
|
nuclear@26
|
99
|
nuclear@26
|
100 long ThreadPool::wait()
|
nuclear@26
|
101 {
|
nuclear@26
|
102 auto start_time = steady_clock::now();
|
nuclear@26
|
103
|
nuclear@26
|
104 std::unique_lock<std::mutex> lock(workq_mutex);
|
nuclear@26
|
105 done_condvar.wait(lock, [this](){ return nactive == 0 && workq.empty(); });
|
nuclear@26
|
106
|
nuclear@26
|
107 auto dur = steady_clock::now() - start_time;
|
nuclear@26
|
108 return duration_cast<milliseconds>(dur).count();
|
nuclear@26
|
109 }
|
nuclear@26
|
110
|
nuclear@26
|
111 long ThreadPool::wait(long timeout)
|
nuclear@26
|
112 {
|
nuclear@26
|
113 auto start_time = steady_clock::now();
|
nuclear@26
|
114 duration<long, std::milli> dur, timeout_dur(std::max(timeout, 5L));
|
nuclear@26
|
115
|
nuclear@26
|
116 std::unique_lock<std::mutex> lock(workq_mutex);
|
nuclear@26
|
117 while(timeout_dur.count() > 0 && (nactive > 0 || !workq.empty())) {
|
nuclear@26
|
118 if(done_condvar.wait_for(lock, timeout_dur) == std::cv_status::timeout) {
|
nuclear@26
|
119 break;
|
nuclear@26
|
120 }
|
nuclear@26
|
121 dur = duration_cast<milliseconds>(steady_clock::now() - start_time);
|
nuclear@26
|
122 timeout_dur = milliseconds(std::max(timeout, 5L)) - dur;
|
nuclear@26
|
123 }
|
nuclear@26
|
124
|
nuclear@26
|
125 /*printf("waited for: %ld ms (%ld req) (na %d,qs %d,em %s)\n", dur.count(), timeout,
|
nuclear@26
|
126 nactive, qsize, workq.empty() ? "true" : "false");*/
|
nuclear@26
|
127 return dur.count();
|
nuclear@26
|
128 }
|
nuclear@26
|
129
|
nuclear@26
|
130 void ThreadPool::thread_func()
|
nuclear@26
|
131 {
|
nuclear@26
|
132 std::unique_lock<std::mutex> lock(workq_mutex);
|
nuclear@26
|
133 for(;;) {
|
nuclear@26
|
134 if(quit) break;
|
nuclear@26
|
135
|
nuclear@26
|
136 workq_condvar.wait(lock);
|
nuclear@26
|
137
|
nuclear@26
|
138 while(!quit && !workq.empty()) {
|
nuclear@26
|
139 WorkItem witem = workq.front();
|
nuclear@26
|
140 workq.pop_front();
|
nuclear@26
|
141 ++nactive;
|
nuclear@26
|
142 --qsize;
|
nuclear@26
|
143 lock.unlock();
|
nuclear@26
|
144
|
nuclear@26
|
145 witem.work();
|
nuclear@26
|
146 if(witem.done) {
|
nuclear@26
|
147 witem.done();
|
nuclear@26
|
148 }
|
nuclear@26
|
149
|
nuclear@26
|
150 lock.lock();
|
nuclear@26
|
151 --nactive;
|
nuclear@26
|
152 done_condvar.notify_all();
|
nuclear@26
|
153 }
|
nuclear@26
|
154 }
|
nuclear@26
|
155 }
|
nuclear@26
|
156
|