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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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162 lines
3.9 KiB
C
162 lines
3.9 KiB
C
#include <string.h> /* memset */
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#include <stdlib.h> /* memset */
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#include "gstmemchunk.h"
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#ifdef __SMP__
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#define CHUNK_LOCK "lock ; "
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#else
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#define CHUNK_LOCK ""
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#endif
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#define GST_MEM_CHUNK_AREA(chunk) (((GstMemChunkElement*)(chunk))->area)
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#define GST_MEM_CHUNK_DATA(chunk) ((gpointer)(((GstMemChunkElement*)(chunk)) + 1))
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#define GST_MEM_CHUNK_LINK(mem) ((GstMemChunkElement*)((guint8*)(mem) - sizeof (GstMemChunkElement)))
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/*******************************************************
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* area size
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* +-----------------------------------------+
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* chunk size
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* +------------+
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*
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* !next!data... !next!data.... !next!data...
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* ! ^ ! ^ !
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* +-------------+ +------------+ +---> NULL
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*
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*/
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static gboolean
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populate (GstMemChunk * mem_chunk)
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{
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guint8 *area;
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gint i;
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if (mem_chunk->cleanup)
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return FALSE;
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area = (guint8 *) g_malloc (mem_chunk->area_size);
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g_print ("alloc %p\n", area);
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for (i = 0; i < mem_chunk->area_size; i += mem_chunk->chunk_size) {
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GST_MEM_CHUNK_AREA (area + i) = (GstMemChunkElement *) area;
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gst_mem_chunk_free (mem_chunk, GST_MEM_CHUNK_DATA (area + i));
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}
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return TRUE;
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}
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GstMemChunk *
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gst_mem_chunk_new (gchar * name, gint atom_size, gulong area_size, gint type)
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{
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GstMemChunk *mem_chunk;
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g_return_val_if_fail (atom_size > 0, NULL);
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g_return_val_if_fail (area_size >= atom_size, NULL);
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mem_chunk = g_malloc (sizeof (GstMemChunk));
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mem_chunk->chunk_size = atom_size + sizeof (GstMemChunkElement);
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area_size = (area_size / atom_size) * mem_chunk->chunk_size;
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mem_chunk->name = g_strdup (name);
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mem_chunk->free = NULL;
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mem_chunk->cnt = 0;
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mem_chunk->atom_size = atom_size;
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mem_chunk->area_size = area_size;
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mem_chunk->cleanup = FALSE;
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populate (mem_chunk);
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return mem_chunk;
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}
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static gboolean
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free_area (gpointer key, gpointer value, gpointer user_data)
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{
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g_print ("free %p\n", key);
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g_free (key);
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return TRUE;
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}
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void
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gst_mem_chunk_destroy (GstMemChunk * mem_chunk)
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{
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GHashTable *elements = g_hash_table_new (NULL, NULL);
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gpointer data;
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mem_chunk->cleanup = TRUE;
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data = gst_mem_chunk_alloc (mem_chunk);
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while (data) {
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GstMemChunkElement *elem = GST_MEM_CHUNK_LINK (data);
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g_hash_table_insert (elements, GST_MEM_CHUNK_AREA (elem), NULL);
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data = gst_mem_chunk_alloc (mem_chunk);
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}
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g_hash_table_foreach_remove (elements, free_area, NULL);
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g_hash_table_destroy (elements);
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g_free (mem_chunk->name);
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g_free (mem_chunk);
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}
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gpointer
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gst_mem_chunk_alloc (GstMemChunk * mem_chunk)
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{
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GstMemChunkElement *chunk = NULL;
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g_return_val_if_fail (mem_chunk != NULL, NULL);
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again:
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#ifdef HAVE_I386
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__asm__ __volatile__ (" testl %%eax, %%eax \n\t" " jz 20f \n" "10: \t" " movl (%%eax), %%ebx \n\t" " movl %%edx, %%ecx \n\t" " incl %%ecx \n\t" CHUNK_LOCK "cmpxchg8b %1 \n\t" " jz 20f \n\t" " testl %%eax, %%eax \n\t" " jnz 10b \n" "20:\t":"=a" (chunk)
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: "m" (*mem_chunk), "a" (mem_chunk->free), "d" (mem_chunk->cnt)
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: "ecx", "ebx");
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#else
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fprintf (stderr, "This only compiles correctly on i386. Sorry\n");
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abort ();
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#endif
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if (!chunk) {
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/*g_print ("extending\n"); */
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if (populate (mem_chunk))
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goto again;
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else
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return NULL;
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}
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return GST_MEM_CHUNK_DATA (chunk);
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}
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gpointer
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gst_mem_chunk_alloc0 (GstMemChunk * mem_chunk)
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{
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gpointer mem = gst_mem_chunk_alloc (mem_chunk);
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if (mem)
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memset (mem, 0, mem_chunk->atom_size);
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return mem;
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}
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void
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gst_mem_chunk_free (GstMemChunk * mem_chunk, gpointer mem)
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{
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GstMemChunkElement *chunk;
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g_return_if_fail (mem_chunk != NULL);
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g_return_if_fail (mem != NULL);
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chunk = GST_MEM_CHUNK_LINK (mem);
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#ifdef HAVE_I386
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__asm__ __volatile__ ("1: \t"
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" movl %2, (%1) \n"
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CHUNK_LOCK "cmpxchg %1, %0 \n\t"
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" jnz 1b \n\t"::
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"m" (*mem_chunk), "r" (chunk), "a" (mem_chunk->free));
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#else
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fprintf (stderr, "This only compiles correctly on i386. Sorry\n");
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abort ();
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#endif
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}
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