fifo_peek.hh revision 13521:74fa3ac44057
1/***************************************************************************** 2 3 Licensed to Accellera Systems Initiative Inc. (Accellera) under one or 4 more contributor license agreements. See the NOTICE file distributed 5 with this work for additional information regarding copyright ownership. 6 Accellera licenses this file to you under the Apache License, Version 2.0 7 (the "License"); you may not use this file except in compliance with the 8 License. You may obtain a copy of the License at 9 10 http://www.apache.org/licenses/LICENSE-2.0 11 12 Unless required by applicable law or agreed to in writing, software 13 distributed under the License is distributed on an "AS IS" BASIS, 14 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or 15 implied. See the License for the specific language governing 16 permissions and limitations under the License. 17 18 *****************************************************************************/ 19 20#ifndef __TLM_CORE_1_REQ_RSP_CHANNELS_FIFO_FIFO_PEEK_HH__ 21#define __TLM_CORE_1_REQ_RSP_CHANNELS_FIFO_FIFO_PEEK_HH__ 22 23namespace tlm 24{ 25 26template <typename T> 27inline T 28tlm_fifo<T>::peek(tlm_tag<T> *) const 29{ 30 while (is_empty()) { 31 // call free-standing sc_core::wait(), 32 // since sc_prim_channel::wait(.) is not const 33 sc_core::wait(m_data_written_event); 34 } 35 return buffer.read_data(); 36} 37 38template <typename T> 39inline bool 40tlm_fifo<T>::nb_peek(T &t) const 41{ 42 if (used() < 1) { 43 return false; 44 } 45 46 t = buffer.peek_data(0); 47 return true; 48} 49 50template <typename T> 51inline bool 52tlm_fifo<T>::nb_peek(T &t, int n) const 53{ 54 if (n >= used() || n < -1) { 55 return false; 56 } 57 58 if (n == -1) { 59 n = used() - 1; 60 } 61 62 t = buffer.peek_data(n); 63 return true; 64} 65 66template <typename T> 67inline bool 68tlm_fifo<T>::nb_can_peek(tlm_tag<T> *) const 69{ 70 return !is_empty(); 71} 72 73template <typename T> 74inline bool 75tlm_fifo<T>::nb_poke(const T &t, int n) 76{ 77 if (n >= used() || n < 0) { 78 return false; 79 } 80 81 buffer.poke_data(n) = t; 82 return true; 83} 84 85} // namespace tlm 86 87#endif /* __TLM_CORE_1_REQ_RSP_CHANNELS_FIFO_FIFO_PEEK_HH__ */ 88