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/*
* delayqueue.h
*
* Copyright (c) 2009 by Tor M. Aamodt, Wilson W. L. Fung, Ali Bakhoda,
* Ivan Sham, Henry Tran and the University of British Columbia
* Vancouver, BC V6T 1Z4
* All Rights Reserved.
*
* THIS IS A LEGAL DOCUMENT BY DOWNLOADING GPGPU-SIM, YOU ARE AGREEING TO THESE
* TERMS AND CONDITIONS.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNERS OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
* NOTE: The files libcuda/cuda_runtime_api.c and src/cuda-sim/cuda-math.h
* are derived from the CUDA Toolset available from http://www.nvidia.com/cuda
* (property of NVIDIA). The files benchmarks/BlackScholes/ and
* benchmarks/template/ are derived from the CUDA SDK available from
* http://www.nvidia.com/cuda (also property of NVIDIA). The files from
* src/intersim/ are derived from Booksim (a simulator provided with the
* textbook "Principles and Practices of Interconnection Networks" available
* from http://cva.stanford.edu/books/ppin/). As such, those files are bound by
* the corresponding legal terms and conditions set forth separately (original
* copyright notices are left in files from these sources and where we have
* modified a file our copyright notice appears before the original copyright
* notice).
*
* Using this version of GPGPU-Sim requires a complete installation of CUDA
* which is distributed seperately by NVIDIA under separate terms and
* conditions. To use this version of GPGPU-Sim with OpenCL requires a
* recent version of NVIDIA's drivers which support OpenCL.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* 3. Neither the name of the University of British Columbia nor the names of
* its contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* 4. This version of GPGPU-SIM is distributed freely for non-commercial use only.
*
* 5. No nonprofit user may place any restrictions on the use of this software,
* including as modified by the user, by any other authorized user.
*
* 6. GPGPU-SIM was developed primarily by Tor M. Aamodt, Wilson W. L. Fung,
* Ali Bakhoda, George L. Yuan, at the University of British Columbia,
* Vancouver, BC V6T 1Z4
*/
#include <stdio.h>
#include <assert.h>
#include <stdlib.h>
#ifndef DELAYQUEUE_H
#define DELAYQUEUE_H
#include "../intersim/statwraper.h"
#include "gpu-misc.h"
template <class T>
struct fifo_data {
T *m_data;
fifo_data *m_next;
};
template <class T>
class fifo_pipeline {
public:
fifo_pipeline(const char* nm, unsigned int minlen, unsigned int maxlen )
{
assert(maxlen);
m_name = nm;
m_min_len = minlen;
m_max_len = maxlen;
m_length = 0;
m_n_element = 0;
m_head = NULL;
m_tail = NULL;
for (unsigned i=0;i<m_min_len;i++)
push(NULL);
}
~fifo_pipeline()
{
while (m_head) {
m_tail = m_head;
m_head = m_head->m_next;
delete m_tail;
}
}
void push(T* data )
{
assert(m_length < m_max_len);
if (m_head) {
if (m_tail->m_data || m_length < m_min_len) {
m_tail->m_next = new fifo_data<T>();
m_tail = m_tail->m_next;
m_length++;
m_n_element++;
}
} else {
m_head = m_tail = new fifo_data<T>();
m_length++;
m_n_element++;
}
m_tail->m_next = NULL;
m_tail->m_data = data;
}
T* pop()
{
fifo_data<T>* next;
T* data;
if (m_head) {
next = m_head->m_next;
data = m_head->m_data;
if ( m_head == m_tail ) {
assert( next == NULL );
m_tail = NULL;
}
delete m_head;
m_head = next;
m_length--;
if (m_length == 0) {
assert( m_head == NULL );
m_tail = m_head;
}
m_n_element--;
if (m_min_len && m_length < m_min_len) {
push(NULL);
m_n_element--; // uncount NULL elements inserted to create delays
}
} else {
data = NULL;
}
return data;
}
T* top() const
{
if (m_head) {
return m_head->m_data;
} else {
return NULL;
}
}
void set_min_length(unsigned int new_min_len)
{
if (new_min_len == m_min_len) return;
if (new_min_len > m_min_len) {
m_min_len = new_min_len;
while (m_length < m_min_len) {
push(NULL);
m_n_element--; // uncount NULL elements inserted to create delays
}
} else {
// in this branch imply that the original min_len is larger then 0
// ie. head != 0
assert(m_head);
m_min_len = new_min_len;
while ((m_length > m_min_len) && (m_tail->m_data == 0)) {
fifo_data<T> *iter;
iter = m_head;
while (iter && (iter->m_next != m_tail))
iter = iter->m_next;
if (!iter) {
// there is only one node, and that node is empty
assert(m_head->m_data == 0);
pop();
} else {
// there are more than one node, and tail node is empty
assert(iter->m_next == m_tail);
delete m_tail;
m_tail = iter;
m_tail->m_next = 0;
m_length--;
}
}
}
}
bool full() const { return (m_max_len && m_length >= m_max_len); }
bool empty() const { return m_head == NULL; }
unsigned get_n_element() const { return m_n_element; }
unsigned get_length() const { return m_length; }
unsigned get_max_len() const { return m_max_len; }
void print() const
{
fifo_data<T>* ddp = m_head;
printf("%s(%d): ", m_name, m_length);
while (ddp) {
printf("%p ", ddp->m_data);
ddp = ddp->m_next;
}
printf("\n");
}
private:
const char* m_name;
unsigned int m_min_len;
unsigned int m_max_len;
unsigned int m_length;
unsigned int m_n_element;
fifo_data<T> *m_head;
fifo_data<T> *m_tail;
};
#endif
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