diff options
Diffstat (limited to 'plugins/eg-sampler.lv2/zix/ring.c')
| -rw-r--r-- | plugins/eg-sampler.lv2/zix/ring.c | 231 |
1 files changed, 0 insertions, 231 deletions
diff --git a/plugins/eg-sampler.lv2/zix/ring.c b/plugins/eg-sampler.lv2/zix/ring.c deleted file mode 100644 index 29d415c..0000000 --- a/plugins/eg-sampler.lv2/zix/ring.c +++ /dev/null @@ -1,231 +0,0 @@ -/* - Copyright 2011-2012 David Robillard <http://drobilla.net> - - Permission to use, copy, modify, and/or distribute this software for any - purpose with or without fee is hereby granted, provided that the above - copyright notice and this permission notice appear in all copies. - - THIS SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES - WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF - MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR - ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES - WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN - ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF - OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. -*/ - -#include <stdint.h> -#include <stdlib.h> -#include <string.h> - -#ifdef HAVE_MLOCK -# include <sys/mman.h> -# define ZIX_MLOCK(ptr, size) mlock((ptr), (size)) -#elif defined(_WIN32) -# include <windows.h> -# define ZIX_MLOCK(ptr, size) VirtualLock((ptr), (size)) -#else -# pragma message("warning: No memory locking, possible RT violations") -# define ZIX_MLOCK(ptr, size) -#endif - -#if defined(__APPLE__) -# include <libkern/OSAtomic.h> -# define ZIX_FULL_BARRIER() OSMemoryBarrier() -#elif defined(_WIN32) -# include <windows.h> -# define ZIX_FULL_BARRIER() MemoryBarrier() -#elif (__GNUC__ > 4) || (__GNUC__ == 4 && __GNUC_MINOR__ >= 1) -# define ZIX_FULL_BARRIER() __sync_synchronize() -#else -# pragma message("warning: No memory barriers, possible SMP bugs") -# define ZIX_FULL_BARRIER() -#endif - -/* No support for any systems with separate read and write barriers */ -#define ZIX_READ_BARRIER() ZIX_FULL_BARRIER() -#define ZIX_WRITE_BARRIER() ZIX_FULL_BARRIER() - -#include "zix/ring.h" - -struct ZixRingImpl { - uint32_t write_head; ///< Read index into buf - uint32_t read_head; ///< Write index into buf - uint32_t size; ///< Size (capacity) in bytes - uint32_t size_mask; ///< Mask for fast modulo - char* buf; ///< Contents -}; - -static inline uint32_t -next_power_of_two(uint32_t size) -{ - // http://graphics.stanford.edu/~seander/bithacks.html#RoundUpPowerOf2 - size--; - size |= size >> 1; - size |= size >> 2; - size |= size >> 4; - size |= size >> 8; - size |= size >> 16; - size++; - return size; -} - -ZixRing* -zix_ring_new(uint32_t size) -{ - ZixRing* ring = (ZixRing*)malloc(sizeof(ZixRing)); - ring->write_head = 0; - ring->read_head = 0; - ring->size = next_power_of_two(size); - ring->size_mask = ring->size - 1; - ring->buf = (char*)malloc(ring->size); - return ring; -} - -void -zix_ring_free(ZixRing* ring) -{ - free(ring->buf); - free(ring); -} - -void -zix_ring_mlock(ZixRing* ring) -{ - ZIX_MLOCK(ring, sizeof(ZixRing)); - ZIX_MLOCK(ring->buf, ring->size); -} - -void -zix_ring_reset(ZixRing* ring) -{ - ring->write_head = 0; - ring->read_head = 0; -} - -static inline uint32_t -read_space_internal(const ZixRing* ring, uint32_t r, uint32_t w) -{ - if (r < w) { - return w - r; - } else { - return (w - r + ring->size) & ring->size_mask; - } -} - -uint32_t -zix_ring_read_space(const ZixRing* ring) -{ - return read_space_internal(ring, ring->read_head, ring->write_head); -} - -static inline uint32_t -write_space_internal(const ZixRing* ring, uint32_t r, uint32_t w) -{ - if (r == w) { - return ring->size - 1; - } else if (r < w) { - return ((r - w + ring->size) & ring->size_mask) - 1; - } else { - return (r - w) - 1; - } -} - -uint32_t -zix_ring_write_space(const ZixRing* ring) -{ - return write_space_internal(ring, ring->read_head, ring->write_head); -} - -uint32_t -zix_ring_capacity(const ZixRing* ring) -{ - return ring->size - 1; -} - -static inline uint32_t -peek_internal(const ZixRing* ring, uint32_t r, uint32_t w, - uint32_t size, void* dst) -{ - if (read_space_internal(ring, r, w) < size) { - return 0; - } - - if (r + size < ring->size) { - memcpy(dst, &ring->buf[r], size); - } else { - const uint32_t first_size = ring->size - r; - memcpy(dst, &ring->buf[r], first_size); - memcpy((char*)dst + first_size, &ring->buf[0], size - first_size); - } - - return size; -} - -uint32_t -zix_ring_peek(ZixRing* ring, void* dst, uint32_t size) -{ - const uint32_t r = ring->read_head; - const uint32_t w = ring->write_head; - - return peek_internal(ring, r, w, size, dst); -} - -uint32_t -zix_ring_read(ZixRing* ring, void* dst, uint32_t size) -{ - const uint32_t r = ring->read_head; - const uint32_t w = ring->write_head; - - if (peek_internal(ring, r, w, size, dst)) { - ZIX_READ_BARRIER(); - ring->read_head = (r + size) & ring->size_mask; - return size; - } else { - return 0; - } -} - -uint32_t -zix_ring_skip(ZixRing* ring, uint32_t size) -{ - const uint32_t r = ring->read_head; - const uint32_t w = ring->write_head; - if (read_space_internal(ring, r, w) < size) { - return 0; - } - - ZIX_READ_BARRIER(); - ring->read_head = (r + size) & ring->size_mask; - return size; -} - -uint32_t -zix_ring_write(ZixRing* ring, const void* src, uint32_t size) -{ - const uint32_t r = ring->read_head; - const uint32_t w = ring->write_head; - if (write_space_internal(ring, r, w) < size) { - return 0; - } - - if (w + size <= ring->size) { - memcpy(&ring->buf[w], src, size); - ZIX_WRITE_BARRIER(); - ring->write_head = (w + size) & ring->size_mask; - } else { - const uint32_t this_size = ring->size - w; - memcpy(&ring->buf[w], src, this_size); - memcpy(&ring->buf[0], (char*)src + this_size, size - this_size); - ZIX_WRITE_BARRIER(); - ring->write_head = size - this_size; - } - - return size; -} - -void* -zix_ring_write_head(ZixRing* ring) -{ - return &ring->buf[ring->write_head]; -} |