57 lines
1.3 KiB
C++
57 lines
1.3 KiB
C++
#include <condition_variable>
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#include <semaphore>
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#include <concepts>
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namespace zstd {
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template<std::move_constructible T>
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class channel {
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protected:
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int m_tail;
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int m_head;
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int m_size;
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T* m_buf;
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std::mutex m_mtx;
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std::condition_variable m_cv;
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public:
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~channel() {
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reset();
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free(m_buf);
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}
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channel(int size = 1) : m_tail(0), m_head(0), m_buf((T*)malloc(sizeof(T)* size)), m_size(size) {}
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int head() {
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return m_head;
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}
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int tail() {
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return m_tail;
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}
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int count() {
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return m_head - m_tail;
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}
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void reset() {
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for (int i = m_tail; i < m_head; i++) {
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std::destroy_at(m_buf + (m_tail % m_size));
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}
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m_tail = 0;
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m_head = 0;
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}
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template<typename... Args>
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void release(Args... args) {
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std::unique_lock<std::mutex> lck(m_mtx);
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while (m_head >= m_tail + m_size) {
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m_cv.wait(lck);
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}
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std::construct_at(m_buf + m_head % m_size, std::forward<Args>(args)...);
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if(m_head++ == m_tail)
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m_cv.notify_one();
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};
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T acquire() {//不能传右值引用，右值引用拷贝地址数据不在锁保护范围内
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std::unique_lock<std::mutex> lck(m_mtx);
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while (m_tail >= m_head) {
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m_cv.wait(lck);
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}
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int tail = m_tail % m_size;
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if(m_tail++ == m_head - m_size)
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m_cv.notify_one();
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return std::move(*(m_buf + tail));
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};
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};
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} |