| 1 | #include "pseudo_barrier.h" |
|---|---|
| 2 | #include <condition_variable> |
| 3 | #include <mutex> |
| 4 | #include <thread> |
| 5 | #include <vector> |
| 6 | |
| 7 | std::mutex mutex; |
| 8 | std::condition_variable cond; |
| 9 | pseudo_barrier_t thread3_barrier; |
| 10 | |
| 11 | void * |
| 12 | thread3(void *input) |
| 13 | { |
| 14 | pseudo_barrier_wait(thread3_barrier); |
| 15 | |
| 16 | int dummy = 47; // thread3-before-lock |
| 17 | |
| 18 | std::unique_lock<std::mutex> lock(mutex); |
| 19 | cond.notify_all(); // Set thread3 break point on notify_all at this line. |
| 20 | return NULL; |
| 21 | } |
| 22 | |
| 23 | void * |
| 24 | thread2(void *input) |
| 25 | { |
| 26 | std::unique_lock<std::mutex> lock(mutex); |
| 27 | cond.notify_all(); // release main thread |
| 28 | cond.wait(lock&: lock); |
| 29 | return NULL; |
| 30 | } |
| 31 | |
| 32 | void * |
| 33 | thread1(void *input) |
| 34 | { |
| 35 | std::thread thread_2(thread2, nullptr); |
| 36 | thread_2.join(); |
| 37 | |
| 38 | return NULL; |
| 39 | } |
| 40 | |
| 41 | int main() |
| 42 | { |
| 43 | std::unique_lock<std::mutex> lock(mutex); |
| 44 | |
| 45 | std::thread thread_1(thread1, nullptr); |
| 46 | cond.wait(lock&: lock); // wait for thread2 |
| 47 | |
| 48 | pseudo_barrier_init(thread3_barrier, 10); |
| 49 | |
| 50 | std::vector<std::thread> thread_3s; |
| 51 | for (int i = 0; i < 10; i++) { |
| 52 | thread_3s.push_back(x: std::thread(thread3, nullptr)); |
| 53 | } |
| 54 | |
| 55 | cond.wait(lock&: lock); // wait for thread_3s |
| 56 | |
| 57 | lock.unlock(); |
| 58 | |
| 59 | thread_1.join(); |
| 60 | for (auto &t : thread_3s){ |
| 61 | t.join(); |
| 62 | } |
| 63 | |
| 64 | return 0; |
| 65 | } |
| 66 |