1 /* sl_malloc.c - malloc routines using a per-thread slab */
3 /* This work is part of OpenLDAP Software <http://www.openldap.org/>.
5 * Copyright 2003-2004 The OpenLDAP Foundation.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted only as authorized by the OpenLDAP
12 * A copy of this license is available in the file LICENSE in the
13 * top-level directory of the distribution or, alternatively, at
14 * <http://www.OpenLDAP.org/license.html>.
20 #include <ac/string.h>
36 struct slab_heap *sh = data;
38 ber_memfree_x(sh->h_base, NULL);
39 ber_memfree_x(sh, NULL);
42 BerMemoryFunctions slap_sl_mfuncs =
43 { slap_sl_malloc, slap_sl_calloc, slap_sl_realloc, slap_sl_free };
48 ber_set_option( NULL, LBER_OPT_MEMORY_FNS, &slap_sl_mfuncs );
57 struct slab_heap *sh = NULL;
58 int pad = 2*sizeof(int)-1;
60 ldap_pvt_thread_pool_getkey( ctx, (void *)slap_sl_mem_init, (void **)&sh, NULL );
62 /* round up to doubleword boundary */
67 sh = ch_malloc( sizeof(struct slab_heap) );
68 sh->h_base = ch_malloc( size );
69 ldap_pvt_thread_pool_setkey( ctx, (void *)slap_sl_mem_init,
70 (void *)sh, slap_sl_mem_destroy );
71 } else if ( size > (char *) sh->h_end - (char *) sh->h_base ) {
72 sh->h_base = ch_realloc( sh->h_base, size );
74 sh->h_last = sh->h_base;
75 sh->h_end = (char *) sh->h_base + size;
85 /* separate from context */
86 ldap_pvt_thread_pool_setkey( ctx, (void *)slap_sl_mem_init, NULL, NULL );
95 struct slab_heap *sh = ctx;
96 int pad = 2*sizeof(int)-1;
99 /* ber_set_option calls us like this */
100 if (!ctx) return ber_memalloc_x( size, NULL );
102 /* round up to doubleword boundary */
103 size += pad + sizeof( ber_len_t );
106 if ((char *) sh->h_last + size >= (char *) sh->h_end ) {
108 LDAP_LOG( OPERATION, INFO,
109 "slap_sl_malloc of %lu bytes failed, using ch_malloc\n",
112 Debug( LDAP_DEBUG_TRACE,
113 "slap_sl_malloc of %lu bytes failed, using ch_malloc\n",
116 return ch_malloc( size );
119 *new++ = size - sizeof(ber_len_t);
120 sh->h_last = (char *) sh->h_last + size;
122 return( (void *)new );
126 slap_sl_calloc( ber_len_t n, ber_len_t size, void *ctx )
130 new = slap_sl_malloc( n*size, ctx );
132 memset( new, 0, n*size );
138 slap_sl_realloc( void *ptr, ber_len_t size, void *ctx )
140 struct slab_heap *sh = ctx;
141 int pad = 2*sizeof(int)-1;
142 ber_len_t *p = (ber_len_t *)ptr;
145 if ( ptr == NULL ) return slap_sl_malloc( size, ctx );
147 /* Not our memory? */
148 if ( !sh || ptr < sh->h_base || ptr >= sh->h_end ) {
149 /* duplicate of ch_realloc behavior, oh well */
150 new = ber_memrealloc_x( ptr, size, NULL );
155 LDAP_LOG( OPERATION, ERR,
156 "ch_realloc: reallocation of %lu bytes failed\n", (long)size, 0,0 );
158 Debug( LDAP_DEBUG_ANY, "ch_realloc of %lu bytes failed\n",
162 exit( EXIT_FAILURE );
166 slap_sl_free( ptr, ctx );
170 /* round up to doubleword boundary */
171 size += pad + sizeof( ber_len_t );
174 /* Never shrink blocks */
178 /* If reallocing the last block, we can grow it */
179 } else if ( (char *)ptr + p[-1] == sh->h_last ) {
181 sh->h_last = (char *) sh->h_last + size - p[-1];
184 /* Nowhere to grow, need to alloc and copy */
186 new = slap_sl_malloc( size, ctx );
187 AC_MEMCPY( new, ptr, p[-1] );
193 slap_sl_free( void *ptr, void *ctx )
195 struct slab_heap *sh = ctx;
196 ber_len_t *p = (ber_len_t *)ptr;
198 if ( !sh || ptr < sh->h_base || ptr >= sh->h_end ) {
199 ber_memfree_x( ptr, NULL );
200 } else if ( (char *)ptr + p[-1] == sh->h_last ) {
207 slap_sl_context( void *ptr )
209 struct slab_heap *sh = NULL;
212 ctx = ldap_pvt_thread_pool_context();
214 ldap_pvt_thread_pool_getkey( ctx, (void *)slap_sl_mem_init, (void **)&sh, NULL );
216 if ( sh && ptr >= sh->h_base && ptr <= sh->h_end ) {