GNU Radio 3.5.3.1 C++ API
gr_tpb_detail.h
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1 /* -*- c++ -*- */
2 /*
3  * Copyright 2008,2009 Free Software Foundation, Inc.
4  *
5  * This file is part of GNU Radio
6  *
7  * GNU Radio is free software; you can redistribute it and/or modify
8  * it under the terms of the GNU General Public License as published by
9  * the Free Software Foundation; either version 3, or (at your option)
10  * any later version.
11  *
12  * GNU Radio is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15  * GNU General Public License for more details.
16  *
17  * You should have received a copy of the GNU General Public License along
18  * with this program; if not, write to the Free Software Foundation, Inc.,
19  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
20  */
21 #ifndef INCLUDED_GR_TPB_DETAIL_H
22 #define INCLUDED_GR_TPB_DETAIL_H
23 
24 #include <gr_core_api.h>
25 #include <gruel/thread.h>
26 #include <deque>
27 #include <gruel/pmt.h>
28 
29 class gr_block_detail;
30 
31 /*!
32  * \brief used by thread-per-block scheduler
33  */
35 
36  gruel::mutex mutex; //< protects all vars
41 
42 private:
43  std::deque<pmt::pmt_t> msg_queue;
44 
45 public:
47  : input_changed(false), output_changed(false) { }
48 
49  //! Called by us to tell all our upstream blocks that their output may have changed.
50  void notify_upstream(gr_block_detail *d);
51 
52  //! Called by us to tell all our downstream blocks that their input may have changed.
53  void notify_downstream(gr_block_detail *d);
54 
55  //! Called by us to notify both upstream and downstream
56  void notify_neighbors(gr_block_detail *d);
57 
58  //! Called by us
59  void clear_changed()
60  {
62  input_changed = false;
63  output_changed = false;
64  }
65 
66  //! is the queue empty?
67  bool empty_p() const { return msg_queue.empty(); }
68 
69  //| Acquires and release the mutex
70  void insert_tail(pmt::pmt_t msg);
71 
72  /*!
73  * \returns returns pmt at head of queue or pmt_t() if empty.
74  */
75  pmt::pmt_t delete_head_nowait();
76 
77  /*!
78  * \returns returns pmt at head of queue or pmt_t() if empty.
79  * Caller must already be holding the mutex
80  */
81  pmt::pmt_t delete_head_nowait_already_holding_mutex();
82 
83 private:
84 
85  //! Used by notify_downstream
86  void set_input_changed()
87  {
89  input_changed = true;
90  input_cond.notify_one();
91  }
92 
93  //! Used by notify_upstream
94  void set_output_changed()
95  {
97  output_changed = true;
98  output_cond.notify_one();
99  }
100 
101 };
102 
103 #endif /* INCLUDED_GR_TPB_DETAIL_H */