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9697f95b8f
This reverts commit 15d999759e
.
214 lines
4.3 KiB
C++
214 lines
4.3 KiB
C++
#pragma once
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#include "fiber_cpp_define.hpp"
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#include <list>
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#include <stdlib.h>
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#include "fiber_event.hpp"
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#include "fiber_cond.hpp"
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#if !defined(_WIN32) && !defined(_WIN64)
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namespace acl
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{
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/**
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* 用于协程之间,线程之间以及协程与线程之间的消息通信,通过协程条件变量
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* 及协程事件锁实现
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*
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* 示例:
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*
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* class myobj
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* {
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* public:
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* myobj(void) {}
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* ~myobj(void) {}
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*
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* void test(void) { printf("hello world\r\n"); }
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* };
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*
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* acl::fiber_tbox<myobj> fiber_tbox;
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*
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* void thread_producer(void)
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* {
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* myobj* o = new myobj;
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* fiber_tbox.push(o);
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* }
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*
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* void thread_consumer(void)
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* {
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* myobj* o = fiber_tbox.pop();
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* o->test();
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* delete o;
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* }
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*/
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template<typename T>
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class fiber_tbox : public noncopyable
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{
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public:
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/**
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* 构造方法
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* @param free_obj {bool} 当 fiber_tbox 销毁时,是否自动检查并释放
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* 未被消费的动态对象
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*/
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fiber_tbox(bool free_obj = true) : size_(0), free_obj_(free_obj) {}
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~fiber_tbox(void)
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{
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clear(free_obj_);
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}
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/**
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* 清理消息队列中未被消费的消息对象
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* @param free_obj {bool} 释放调用 delete 方法删除消息对象
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*/
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void clear(bool free_obj = false)
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{
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if (free_obj) {
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for (typename std::list<T*>::iterator it =
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tbox_.begin(); it != tbox_.end(); ++it) {
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delete *it;
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}
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}
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tbox_.clear();
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}
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/**
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* 发送消息对象
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* @param t {T*} 非空消息对象
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* @param notify_first {bool} 如果本参数为 true,则内部添加完消息后
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* 采用先通知后解锁方式,否则采用先解锁后通知方式,当 fiber_tbox 对象
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* 的生存周期比较长时,该参数设为 false 的效率更高,如果 fiber_tbox
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* 对象的生存周期较短(如:等待者调用 pop 后直接销毁 fiber_tbox 对象),
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* 则本参数应该设为 true,以避免 push 者还没有完全返回前因 fiber_tbox
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* 对象被提前销毁而造成内存非法访问
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* @return {bool}
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*/
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bool push(T* t, bool notify_first = true)
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{
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// 先加锁
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if (event_.wait() == false) {
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abort();
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}
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// 向队列中添加消息对象
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tbox_.push_back(t);
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size_++;
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if (notify_first) {
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if (cond_.notify() == false) {
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abort();
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}
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if (event_.notify() == false) {
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abort();
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}
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return true;
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} else {
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if (event_.notify() == false) {
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abort();
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}
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if (cond_.notify() == false) {
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abort();
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}
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return true;
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}
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}
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/**
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* 接收消息对象
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* @param wait_ms {int} >= 0 时设置等待超时时间(毫秒级别),
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* 否则永远等待直到读到消息对象或出错
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* @param found {bool*} 非空时用来存放是否获得了一个消息对象,主要用在
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* 当允许传递空对象时的检查
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* @return {T*} 非 NULL 表示获得一个消息对象,返回 NULL 时得需要做进一
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* 步检查,生产者如果 push 了一个空对象(NULL),则消费者也会获得 NULL,
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* 但此时仍然认为获得了一个消息对象,只不过为空对象;如果 wait_ms 参数
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* 为 -1 时返回 NULL 依然认为获得了一个空消息对象,如果 wait_ms 大于
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* 等于 0 时返回 NULL,则应该检查 found 参数的值为 true 还是 false 来
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* 判断是否获得了一个空消息对象
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*/
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T* pop(int wait_ms = -1, bool* found = NULL)
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{
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bool found_flag;
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if (event_.wait() == false) {
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abort();
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}
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while (true) {
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T* t = peek(found_flag);
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if (found_flag) {
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if (event_.notify() == false) {
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abort();
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}
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if (found) {
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*found = found_flag;
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}
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return t;
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}
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// 注意调用顺序,必须先调用 wait 再判断 wait_ms
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if (!cond_.wait(event_, wait_ms) && wait_ms >= 0) {
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if (event_.notify() == false) {
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abort();
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}
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if (found) {
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*found = false;
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}
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return NULL;
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}
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}
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}
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/**
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* 返回当前存在于消息队列中的消息数量
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* @return {size_t}
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*/
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size_t size(void) const
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{
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return size_;
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}
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public:
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void lock(void)
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{
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if (event_.wait() == false) {
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abort();
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}
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}
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void unlock(void)
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{
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if (event_.notify() == false) {
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abort();
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}
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}
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private:
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fiber_tbox(const fiber_tbox&) {}
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const fiber_tbox& operator=(const fiber_tbox&);
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private:
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std::list<T*> tbox_;
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size_t size_;
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bool free_obj_;
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fiber_event event_;
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fiber_cond cond_;
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T* peek(bool& found_flag)
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{
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typename std::list<T*>::iterator it = tbox_.begin();
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if (it == tbox_.end()) {
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found_flag = false;
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return NULL;
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}
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found_flag = true;
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size_--;
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T* t = *it;
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tbox_.erase(it);
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return t;
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}
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};
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} // namespace acl
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#endif
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