1/*****************************************************************************
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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.
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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