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4c5ccd3e8f
Inlining the memset() is beneficial since the size here is constant and usually small. Closes #5
116 lines
4.5 KiB
C
116 lines
4.5 KiB
C
/* GLIB sliced memory - fast threaded memory chunk allocator
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* Copyright (C) 2005 Tim Janik
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef __G_SLICE_H__
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#define __G_SLICE_H__
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#if !defined (__GLIB_H_INSIDE__) && !defined (GLIB_COMPILATION)
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#error "Only <glib.h> can be included directly."
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#endif
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#include <glib/gtypes.h>
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#include <string.h>
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G_BEGIN_DECLS
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/* slices - fast allocation/release of small memory blocks
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*/
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GLIB_AVAILABLE_IN_ALL
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gpointer g_slice_alloc (gsize block_size) G_GNUC_MALLOC G_GNUC_ALLOC_SIZE(1);
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GLIB_AVAILABLE_IN_ALL
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gpointer g_slice_alloc0 (gsize block_size) G_GNUC_MALLOC G_GNUC_ALLOC_SIZE(1);
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GLIB_AVAILABLE_IN_ALL
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gpointer g_slice_copy (gsize block_size,
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gconstpointer mem_block) G_GNUC_ALLOC_SIZE(1);
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GLIB_AVAILABLE_IN_ALL
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void g_slice_free1 (gsize block_size,
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gpointer mem_block);
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GLIB_AVAILABLE_IN_ALL
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void g_slice_free_chain_with_offset (gsize block_size,
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gpointer mem_chain,
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gsize next_offset);
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#define g_slice_new(type) ((type*) g_slice_alloc (sizeof (type)))
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/* Allow the compiler to inline memset(). Since the size is a constant, this
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* can significantly improve performance. */
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#if defined (__GNUC__) && (__GNUC__ >= 2) && defined (__OPTIMIZE__)
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# define g_slice_new0(type) \
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(type *) (G_GNUC_EXTENSION ({ \
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gsize __s = sizeof (type); \
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gpointer __p; \
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__p = g_slice_alloc (__s); \
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memset (__p, 0, __s); \
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__p; \
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}))
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#else
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# define g_slice_new0(type) ((type*) g_slice_alloc0 (sizeof (type)))
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#endif
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/* MemoryBlockType *
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* g_slice_dup (MemoryBlockType,
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* MemoryBlockType *mem_block);
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* g_slice_free (MemoryBlockType,
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* MemoryBlockType *mem_block);
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* g_slice_free_chain (MemoryBlockType,
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* MemoryBlockType *first_chain_block,
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* memory_block_next_field);
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* pseudo prototypes for the macro
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* definitions following below.
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*/
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/* we go through extra hoops to ensure type safety */
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#define g_slice_dup(type, mem) \
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(1 ? (type*) g_slice_copy (sizeof (type), (mem)) \
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: ((void) ((type*) 0 == (mem)), (type*) 0))
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#define g_slice_free(type, mem) \
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G_STMT_START { \
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if (1) g_slice_free1 (sizeof (type), (mem)); \
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else (void) ((type*) 0 == (mem)); \
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} G_STMT_END
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#define g_slice_free_chain(type, mem_chain, next) \
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G_STMT_START { \
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if (1) g_slice_free_chain_with_offset (sizeof (type), \
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(mem_chain), G_STRUCT_OFFSET (type, next)); \
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else (void) ((type*) 0 == (mem_chain)); \
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} G_STMT_END
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/* --- internal debugging API --- */
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typedef enum {
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G_SLICE_CONFIG_ALWAYS_MALLOC = 1,
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G_SLICE_CONFIG_BYPASS_MAGAZINES,
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G_SLICE_CONFIG_WORKING_SET_MSECS,
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G_SLICE_CONFIG_COLOR_INCREMENT,
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G_SLICE_CONFIG_CHUNK_SIZES,
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G_SLICE_CONFIG_CONTENTION_COUNTER
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} GSliceConfig;
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GLIB_DEPRECATED_IN_2_34
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void g_slice_set_config (GSliceConfig ckey, gint64 value);
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GLIB_DEPRECATED_IN_2_34
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gint64 g_slice_get_config (GSliceConfig ckey);
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GLIB_DEPRECATED_IN_2_34
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gint64* g_slice_get_config_state (GSliceConfig ckey, gint64 address, guint *n_values);
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#ifdef G_ENABLE_DEBUG
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GLIB_AVAILABLE_IN_ALL
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void g_slice_debug_tree_statistics (void);
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#endif
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G_END_DECLS
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#endif /* __G_SLICE_H__ */
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