Magisk/native/jni/utils/include/BlockingQueue.h
2019-02-10 03:16:52 -05:00

99 lines
2.0 KiB
C++

#pragma once
#include <pthread.h>
#include <deque>
template<typename T>
class BlockingQueue {
std::deque<T> deque{};
pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER;
pthread_cond_t cond = PTHREAD_COND_INITIALIZER;
bool cancelled = false;
public:
~BlockingQueue();
T take();
T &front();
T &back();
void put(const T&);
void put(T&&);
template< class... Args >
void emplace_back(Args&&... args);
void clear();
void cancel();
};
#define run_and_notify(block) \
pthread_mutex_lock(&this->lock); \
block \
pthread_cond_signal(&this->cond); \
pthread_mutex_unlock(&this->lock);
template<typename T>
BlockingQueue<T>::~BlockingQueue() {
pthread_mutex_destroy(&lock);
pthread_cond_destroy(&cond);
}
template<typename T>
T BlockingQueue<T>::take() {
pthread_mutex_lock(&lock);
cancelled = false;
while (deque.empty() && !cancelled)
pthread_cond_wait(&cond, &lock);
if (cancelled)
pthread_exit(nullptr);
T ret(std::move(deque.front()));
deque.pop_front();
pthread_mutex_unlock(&lock);
return ret;
}
template<typename T>
void BlockingQueue<T>::put(const T &s) {
run_and_notify({ deque.push_back(s); })
}
template<typename T>
void BlockingQueue<T>::put(T &&s) {
run_and_notify({ deque.push_back(std::move(s)); })
}
template<typename T>
T &BlockingQueue<T>::front() {
pthread_mutex_lock(&lock);
auto &ret = deque.front();
pthread_mutex_unlock(&lock);
return ret;
}
template<typename T>
T &BlockingQueue<T>::back() {
pthread_mutex_lock(&lock);
auto &ret = deque.back();
pthread_mutex_unlock(&lock);
return ret;
}
template<typename T>
template<class... Args>
void BlockingQueue<T>::emplace_back(Args &&... args) {
run_and_notify({ deque.emplace_back(std::forward<Args>(args)...); })
}
template<typename T>
void BlockingQueue<T>::clear() {
pthread_mutex_lock(&lock);
std::deque<T> t;
deque.swap(t);
pthread_mutex_unlock(&lock);
}
template<typename T>
void BlockingQueue<T>::cancel() {
run_and_notify({
cancelled = true;
std::deque<T> t;
deque.swap(t);
})
}