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Diffstat (limited to 'libs/pbd3/pbd/ringbufferNPT.h')
| -rw-r--r-- | libs/pbd3/pbd/ringbufferNPT.h | 275 |
1 files changed, 0 insertions, 275 deletions
diff --git a/libs/pbd3/pbd/ringbufferNPT.h b/libs/pbd3/pbd/ringbufferNPT.h deleted file mode 100644 index fee2efce3d..0000000000 --- a/libs/pbd3/pbd/ringbufferNPT.h +++ /dev/null @@ -1,275 +0,0 @@ -/* - Copyright (C) 2000 Paul Davis & Benno Senoner - - This program 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 2 of the License, or - (at your option) any later version. - - This program 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 this program; if not, write to the Free Software - Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. - - $Id$ -*/ - -#ifndef ringbuffer_npt_h -#define ringbuffer_npt_h - -//#include <sys/mman.h> - -#include <glib.h> - -/* ringbuffer class where the element size is not required to be a power of two */ - -template<class T> -class RingBufferNPT -{ - public: - RingBufferNPT (size_t sz) { - size = sz; - buf = new T[size]; - reset (); - - }; - - virtual ~RingBufferNPT() { - delete [] buf; - } - - void reset () { - /* !!! NOT THREAD SAFE !!! */ - g_atomic_int_set (&write_ptr, 0); - g_atomic_int_set (&read_ptr, 0); - } - - void set (size_t r, size_t w) { - /* !!! NOT THREAD SAFE !!! */ - g_atomic_int_set (&write_ptr, w); - g_atomic_int_set (&read_ptr, r); - } - - size_t read (T *dest, size_t cnt); - size_t write (T *src, size_t cnt); - - struct rw_vector { - T *buf[2]; - size_t len[2]; - }; - - void get_read_vector (rw_vector *); - void get_write_vector (rw_vector *); - - void decrement_read_ptr (size_t cnt) { - g_atomic_int_set (&read_ptr, (g_atomic_int_get(&read_ptr) - cnt) % size); - } - - void increment_read_ptr (size_t cnt) { - g_atomic_int_set (&read_ptr, (g_atomic_int_get(&read_ptr) + cnt) % size); - } - - void increment_write_ptr (size_t cnt) { - g_atomic_int_set (&write_ptr, (g_atomic_int_get(&write_ptr) + cnt) % size); - } - - size_t write_space () { - size_t w, r; - - w = g_atomic_int_get (&write_ptr); - r = g_atomic_int_get (&read_ptr); - - if (w > r) { - return ((r - w + size) % size) - 1; - } else if (w < r) { - return (r - w) - 1; - } else { - return size - 1; - } - } - - size_t read_space () { - size_t w, r; - - w = g_atomic_int_get (&write_ptr); - r = g_atomic_int_get (&read_ptr); - - if (w > r) { - return w - r; - } else { - return (w - r + size) % size; - } - } - - T *buffer () { return buf; } - size_t get_write_ptr () const { return g_atomic_int_get (&write_ptr); } - size_t get_read_ptr () const { return g_atomic_int_get (&read_ptr); } - size_t bufsize () const { return size; } - - protected: - T *buf; - size_t size; - mutable gint write_ptr; - mutable gint read_ptr; -}; - -template<class T> size_t -RingBufferNPT<T>::read (T *dest, size_t cnt) -{ - size_t free_cnt; - size_t cnt2; - size_t to_read; - size_t n1, n2; - size_t priv_read_ptr; - - priv_read_ptr=g_atomic_int_get(&read_ptr); - - if ((free_cnt = read_space ()) == 0) { - return 0; - } - - to_read = cnt > free_cnt ? free_cnt : cnt; - - cnt2 = priv_read_ptr + to_read; - - if (cnt2 > size) { - n1 = size - priv_read_ptr; - n2 = cnt2 % size; - } else { - n1 = to_read; - n2 = 0; - } - - memcpy (dest, &buf[priv_read_ptr], n1 * sizeof (T)); - priv_read_ptr = (priv_read_ptr + n1) % size; - - if (n2) { - memcpy (dest+n1, buf, n2 * sizeof (T)); - priv_read_ptr = n2; - } - - g_atomic_int_set(&read_ptr, priv_read_ptr); - return to_read; -} - -template<class T> size_t -RingBufferNPT<T>::write (T *src, size_t cnt) -{ - size_t free_cnt; - size_t cnt2; - size_t to_write; - size_t n1, n2; - size_t priv_write_ptr; - - priv_write_ptr=g_atomic_int_get(&write_ptr); - - if ((free_cnt = write_space ()) == 0) { - return 0; - } - - to_write = cnt > free_cnt ? free_cnt : cnt; - - cnt2 = priv_write_ptr + to_write; - - if (cnt2 > size) { - n1 = size - priv_write_ptr; - n2 = cnt2 % size; - } else { - n1 = to_write; - n2 = 0; - } - - memcpy (&buf[priv_write_ptr], src, n1 * sizeof (T)); - priv_write_ptr = (priv_write_ptr + n1) % size; - - if (n2) { - memcpy (buf, src+n1, n2 * sizeof (T)); - priv_write_ptr = n2; - } - - g_atomic_int_set(&write_ptr, priv_write_ptr); - return to_write; -} - -template<class T> void -RingBufferNPT<T>::get_read_vector (RingBufferNPT<T>::rw_vector *vec) -{ - size_t free_cnt; - size_t cnt2; - size_t w, r; - - w = g_atomic_int_get (&write_ptr); - r = g_atomic_int_get (&read_ptr); - - if (w > r) { - free_cnt = w - r; - } else { - free_cnt = (w - r + size) % size; - } - - cnt2 = r + free_cnt; - - if (cnt2 > size) { - /* Two part vector: the rest of the buffer after the - current write ptr, plus some from the start of - the buffer. - */ - - vec->buf[0] = &buf[r]; - vec->len[0] = size - r; - vec->buf[1] = buf; - vec->len[1] = cnt2 % size; - - } else { - - /* Single part vector: just the rest of the buffer */ - - vec->buf[0] = &buf[r]; - vec->len[0] = free_cnt; - vec->len[1] = 0; - } -} - -template<class T> void -RingBufferNPT<T>::get_write_vector (RingBufferNPT<T>::rw_vector *vec) -{ - size_t free_cnt; - size_t cnt2; - size_t w, r; - - w = g_atomic_int_get (&write_ptr); - r = g_atomic_int_get (&read_ptr); - - if (w > r) { - free_cnt = ((r - w + size) % size) - 1; - } else if (w < r) { - free_cnt = (r - w) - 1; - } else { - free_cnt = size - 1; - } - - cnt2 = w + free_cnt; - - if (cnt2 > size) { - - /* Two part vector: the rest of the buffer after the - current write ptr, plus some from the start of - the buffer. - */ - - vec->buf[0] = &buf[w]; - vec->len[0] = size - w; - vec->buf[1] = buf; - vec->len[1] = cnt2 % size; - } else { - vec->buf[0] = &buf[w]; - vec->len[0] = free_cnt; - vec->len[1] = 0; - } -} - -#endif /* __ringbuffer_npt_h__ */ |