#ifndef fifo_h
#define fifo_h
-#include <list>
-#include "lock.h"
+#include "types.h"
-// blocks enq() and deq() when queue is FULL or EMPTY
template<class T>
class fifo {
- public:
- fifo(int limit=0) : max_(limit) {};
- bool enq(T, bool blocking=true);
- void deq(T *);
- bool size() {
+ public:
+ fifo(size_t limit=0) : max_(limit) {}
+
+ bool enq(T e, bool blocking=true) {
+ lock ml(m_);
+ while (max_ && q_.size() >= max_) {
+ if (!blocking)
+ return false;
+ has_space_c_.wait(ml);
+ }
+ q_.push_back(e);
+ non_empty_c_.notify_one();
+ return true;
+ }
+
+ T deq() {
lock ml(m_);
- return q_.size();
- };
+ while(q_.empty())
+ non_empty_c_.wait(ml);
+ T t = q_.front();
+ q_.pop_front();
+ if (max_ && q_.size() < max_)
+ has_space_c_.notify_one();
+ return t;
+ }
- private:
- std::list<T> q_;
- mutex m_;
+ private:
+ std::list<T> q_;
+ std::mutex m_;
cond non_empty_c_; // q went non-empty
- cond has_space_c_; // q is not longer overfull
- unsigned int max_; // maximum capacity of the queue, block enq threads if exceeds this limit
+ cond has_space_c_; // q is not longer overfull
+ size_t max_; // maximum capacity of the queue, block enq threads if exceeds this limit
};
-template<class T> bool
-fifo<T>::enq(T e, bool blocking)
-{
- lock ml(m_);
- while (max_ && q_.size() >= max_) {
- if (!blocking)
- return false;
- has_space_c_.wait(ml);
- }
- q_.push_back(e);
- non_empty_c_.notify_one();
- return true;
-}
-
-template<class T> void
-fifo<T>::deq(T *e)
-{
- lock ml(m_);
- while(q_.empty())
- non_empty_c_.wait(ml);
- *e = q_.front();
- q_.pop_front();
- if (max_ && q_.size() < max_)
- has_space_c_.notify_one();
-}
-
#endif