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Diffstat (limited to 'gr-audio-osx/src/circular_buffer.h')
| -rw-r--r-- | gr-audio-osx/src/circular_buffer.h | 315 |
1 files changed, 0 insertions, 315 deletions
diff --git a/gr-audio-osx/src/circular_buffer.h b/gr-audio-osx/src/circular_buffer.h deleted file mode 100644 index 48758bf87..000000000 --- a/gr-audio-osx/src/circular_buffer.h +++ /dev/null @@ -1,315 +0,0 @@ -/* -*- c++ -*- */ -/* - * Copyright 2006,2009,2010 Free Software Foundation, Inc. - * - * This file is part of GNU Radio. - * - * GNU Radio is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 3, or (at your option) - * any later version. - * - * GNU Radio is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with GNU Radio; see the file COPYING. If not, write to - * the Free Software Foundation, Inc., 51 Franklin Street, - * Boston, MA 02110-1301, USA. - */ - -#ifndef _CIRCULAR_BUFFER_H_ -#define _CIRCULAR_BUFFER_H_ - -#include <gruel/thread.h> -#include <iostream> -#include <stdexcept> - -#ifndef DO_DEBUG -#define DO_DEBUG 0 -#endif - -#if DO_DEBUG -#define DEBUG(X) do{X} while(0); -#else -#define DEBUG(X) do{} while(0); -#endif - -template <class T> -class circular_buffer -{ -private: -// the buffer to use - T* d_buffer; - -// the following are in Items (type T) - size_t d_bufLen_I, d_readNdx_I, d_writeNdx_I; - size_t d_n_avail_write_I, d_n_avail_read_I; - -// stuff to control access to class internals - gruel::mutex* d_internal; - gruel::condition_variable* d_readBlock; - gruel::condition_variable* d_writeBlock; - -// booleans to decide how to control reading, writing, and aborting - bool d_doWriteBlock, d_doFullRead, d_doAbort; - - void delete_mutex_cond () { - if (d_internal) { - delete d_internal; - d_internal = NULL; - } - if (d_readBlock) { - delete d_readBlock; - d_readBlock = NULL; - } - if (d_writeBlock) { - delete d_writeBlock; - d_writeBlock = NULL; - } - }; - -public: - circular_buffer (size_t bufLen_I, - bool doWriteBlock = true, bool doFullRead = false) { - if (bufLen_I == 0) - throw std::runtime_error ("circular_buffer(): " - "Number of items to buffer must be > 0.\n"); - d_bufLen_I = bufLen_I; - d_buffer = (T*) new T[d_bufLen_I]; - d_doWriteBlock = doWriteBlock; - d_doFullRead = doFullRead; - d_internal = NULL; - d_readBlock = d_writeBlock = NULL; - reset (); - DEBUG (std::cerr << "c_b(): buf len (items) = " << d_bufLen_ - << ", doWriteBlock = " << (d_doWriteBlock ? "true" : "false") - << ", doFullRead = " << (d_doFullRead ? "true" : "false") - << std::endl); - }; - - ~circular_buffer () { - delete_mutex_cond (); - delete [] d_buffer; - }; - - inline size_t n_avail_write_items () { - gruel::scoped_lock l (*d_internal); - size_t retVal = d_n_avail_write_I; - return (retVal); - }; - - inline size_t n_avail_read_items () { - gruel::scoped_lock l (*d_internal); - size_t retVal = d_n_avail_read_I; - return (retVal); - }; - - inline size_t buffer_length_items () {return (d_bufLen_I);}; - inline bool do_write_block () {return (d_doWriteBlock);}; - inline bool do_full_read () {return (d_doFullRead);}; - - void reset () { - d_doAbort = false; - bzero (d_buffer, d_bufLen_I * sizeof (T)); - d_readNdx_I = d_writeNdx_I = d_n_avail_read_I = 0; - d_n_avail_write_I = d_bufLen_I; - delete_mutex_cond (); - // create a mutex to handle contention of shared resources; - // any routine needed access to shared resources uses lock() - // before doing anything, then unlock() when finished. - d_internal = new gruel::mutex (); - // link the internal mutex to the read and write conditions; - // when wait() is called, the internal mutex will automatically - // be unlock()'ed. Upon return (from a notify_one() to the condition), - // the internal mutex will be lock()'ed. - d_readBlock = new gruel::condition_variable (); - d_writeBlock = new gruel::condition_variable (); - }; - -/* - * enqueue: add the given buffer of item-length to the queue, - * first-in-first-out (FIFO). - * - * inputs: - * buf: a pointer to the buffer holding the data - * - * bufLen_I: the buffer length in items (of the instantiated type) - * - * returns: - * -1: on overflow (write is not blocking, and data is being - * written faster than it is being read) - * 0: if nothing to do (0 length buffer) - * 1: if success - * 2: in the process of aborting, do doing nothing - * - * will throw runtime errors if inputs are improper: - * buffer pointer is NULL - * buffer length is larger than the instantiated buffer length - */ - - int enqueue (T* buf, size_t bufLen_I) { - DEBUG (std::cerr << "enqueue: buf = " << (void*) buf - << ", bufLen = " << bufLen_I - << ", #av_wr = " << d_n_avail_write_I - << ", #av_rd = " << d_n_avail_read_I << std::endl); - if (bufLen_I > d_bufLen_I) { - std::cerr << "ERROR: cannot add buffer longer (" - << bufLen_I << ") than instantiated length (" - << d_bufLen_I << ")." << std::endl; - throw std::runtime_error ("circular_buffer::enqueue()"); - } - - if (bufLen_I == 0) - return (0); - if (!buf) - throw std::runtime_error ("circular_buffer::enqueue(): " - "input buffer is NULL.\n"); - gruel::scoped_lock l (*d_internal); - if (d_doAbort) { - return (2); - } - // set the return value to 1: success; change if needed - int retval = 1; - if (bufLen_I > d_n_avail_write_I) { - if (d_doWriteBlock) { - while (bufLen_I > d_n_avail_write_I) { - DEBUG (std::cerr << "enqueue: #len > #a, waiting." << std::endl); - // wait; will automatically unlock() the internal mutex via - // the scoped lock - d_writeBlock->wait (l); - // and auto re-lock() it here. - if (d_doAbort) { - DEBUG (std::cerr << "enqueue: #len > #a, aborting." << std::endl); - return (2); - } - DEBUG (std::cerr << "enqueue: #len > #a, done waiting." << std::endl); - } - } else { - d_n_avail_read_I = d_bufLen_I - bufLen_I; - d_n_avail_write_I = bufLen_I; - DEBUG (std::cerr << "circular_buffer::enqueue: overflow" << std::endl); - retval = -1; - } - } - size_t n_now_I = d_bufLen_I - d_writeNdx_I, n_start_I = 0; - if (n_now_I > bufLen_I) - n_now_I = bufLen_I; - else if (n_now_I < bufLen_I) - n_start_I = bufLen_I - n_now_I; - bcopy (buf, &(d_buffer[d_writeNdx_I]), n_now_I * sizeof (T)); - if (n_start_I) { - bcopy (&(buf[n_now_I]), d_buffer, n_start_I * sizeof (T)); - d_writeNdx_I = n_start_I; - } else - d_writeNdx_I += n_now_I; - d_n_avail_read_I += bufLen_I; - d_n_avail_write_I -= bufLen_I; - d_readBlock->notify_one (); - return (retval); - }; - -/* - * dequeue: removes from the queue the number of items requested, or - * available, into the given buffer on a FIFO basis. - * - * inputs: - * buf: a pointer to the buffer into which to copy the data - * - * bufLen_I: pointer to the number of items to remove in items - * (of the instantiated type) - * - * returns: - * 0: if nothing to do (0 length buffer) - * 1: if success - * 2: in the process of aborting, do doing nothing - * - * will throw runtime errors if inputs are improper: - * buffer pointer is NULL - * buffer length pointer is NULL - * buffer length is larger than the instantiated buffer length - */ - - int dequeue (T* buf, size_t* bufLen_I) { - DEBUG (std::cerr << "dequeue: buf = " << ((void*) buf) - << ", *bufLen = " << (*bufLen_I) - << ", #av_wr = " << d_n_avail_write_I - << ", #av_rd = " << d_n_avail_read_I << std::endl); - if (!bufLen_I) - throw std::runtime_error ("circular_buffer::dequeue(): " - "input bufLen pointer is NULL.\n"); - if (!buf) - throw std::runtime_error ("circular_buffer::dequeue(): " - "input buffer pointer is NULL.\n"); - size_t l_bufLen_I = *bufLen_I; - if (l_bufLen_I == 0) - return (0); - if (l_bufLen_I > d_bufLen_I) { - std::cerr << "ERROR: cannot remove buffer longer (" - << l_bufLen_I << ") than instantiated length (" - << d_bufLen_I << ")." << std::endl; - throw std::runtime_error ("circular_buffer::dequeue()"); - } - - gruel::scoped_lock l (*d_internal); - if (d_doAbort) { - return (2); - } - if (d_doFullRead) { - while (d_n_avail_read_I < l_bufLen_I) { - DEBUG (std::cerr << "dequeue: #a < #len, waiting." << std::endl); - // wait; will automatically unlock() the internal mutex via - // the scoped lock - d_readBlock->wait (l); - // and re-lock() it here. - if (d_doAbort) { - DEBUG (std::cerr << "dequeue: #a < #len, aborting." << std::endl); - return (2); - } - DEBUG (std::cerr << "dequeue: #a < #len, done waiting." << std::endl); - } - } else { - while (d_n_avail_read_I == 0) { - DEBUG (std::cerr << "dequeue: #a == 0, waiting." << std::endl); - // wait; will automatically unlock() the internal mutex via - // the scoped lock - d_readBlock->wait (l); - // and re-lock() it here. - if (d_doAbort) { - DEBUG (std::cerr << "dequeue: #a == 0, aborting." << std::endl); - return (2); - } - DEBUG (std::cerr << "dequeue: #a == 0, done waiting." << std::endl); - } - } - if (l_bufLen_I > d_n_avail_read_I) - l_bufLen_I = d_n_avail_read_I; - size_t n_now_I = d_bufLen_I - d_readNdx_I, n_start_I = 0; - if (n_now_I > l_bufLen_I) - n_now_I = l_bufLen_I; - else if (n_now_I < l_bufLen_I) - n_start_I = l_bufLen_I - n_now_I; - bcopy (&(d_buffer[d_readNdx_I]), buf, n_now_I * sizeof (T)); - if (n_start_I) { - bcopy (d_buffer, &(buf[n_now_I]), n_start_I * sizeof (T)); - d_readNdx_I = n_start_I; - } else - d_readNdx_I += n_now_I; - *bufLen_I = l_bufLen_I; - d_n_avail_read_I -= l_bufLen_I; - d_n_avail_write_I += l_bufLen_I; - d_writeBlock->notify_one (); - return (1); - }; - - void abort () { - gruel::scoped_lock l (*d_internal); - d_doAbort = true; - d_writeBlock->notify_one (); - d_readBlock->notify_one (); - }; -}; - -#endif /* _CIRCULAR_BUFFER_H_ */ |