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C:/temp/src/j2k/Beta/fast_alloc.c File Reference

#include "fast_alloc.h"

Go to the source code of this file.

Defines
#define	__J2K__FAST_ALLOC_C__   1
Functions
size_t	fast_mem_size (register size_t min_size)
void *	fast_malloc (register size_t min_size)
void *	fast_realloc (register void *buffer, register size_t buf_size, register size_t extra)
void	fast_free (void *buffer)

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Define Documentation

#define __J2K__FAST_ALLOC_C__   1

Definition at line 2 of file fast_alloc.c.

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Function Documentation

void fast_free (  void *    buffer )

Definition at line 90 of file fast_alloc.c. { free( buffer ); }

void* fast_malloc (  register size_t    min_size )

Definition at line 63 of file fast_alloc.c. { if ( min_size < 16 ) min_size = 16; void* buffer = malloc( fast_mem_size( min_size ) ); /* Make sure we have some memory allocated ! */ assert( buffer != NULL ); return buffer; }

size_t fast_mem_size (  register size_t    min_size )

Definition at line 24 of file fast_alloc.c. { register size_t alloc_size = 1; register size_t curr_size = min_size; curr_size += MALLOC_MIN_OVERHEAD; if ( curr_size >= MALLOC_MAX_THRESHOLD ) { curr_size >>= MALLOC_MAX_THRESHOLD_BIT; curr_size++; curr_size <<= MALLOC_MAX_THRESHOLD_BIT; alloc_size = curr_size; } else /* Too small, so exponential growth */ { while( curr_size > 0 ) { curr_size >>= 1; /* Get the highest power of two + 1 bit */ alloc_size <<= 1; } } #ifdef __J2K__DEBUG_TRACE printf( "Wanted space: [%d]\n", min_size ); printf( "Allocated space: [%d]\n", alloc_size ); printf( "malloc'ed space: [%d]\n", alloc_size - MALLOC_MIN_OVERHEAD ); fflush( stdout ); #endif alloc_size -= MALLOC_MIN_OVERHEAD; /* Make sure what we allocate is big enough */ assert( alloc_size >= curr_size ); return alloc_size; }

void* fast_realloc (  register void *    buffer, register size_t    buf_size, register size_t    extra )

Definition at line 76 of file fast_alloc.c. { if ( extra < 16 ) extra = 16; register size_t sz = fast_mem_size( extra ) + buf_size; void* buffer = realloc( buffer, sz ); /* Make sure we have some memory allocated ! */ assert( buffer != NULL ); return buffer; }

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