X-Git-Url: http://review.tizen.org/git/?a=blobdiff_plain;f=glib%2Fgmem.h;h=e1d88d5a19d84af1d4fd92681a53c97cb7dda10c;hb=ecf1359191b2f796a7d63288652dd1a93525417d;hp=70168473457d6bdbd978dae3d84b5f5e0768fe6a;hpb=5f349db0c9858d4f671e0f1209490d95465ca364;p=platform%2Fupstream%2Fglib.git
diff --git a/glib/gmem.h b/glib/gmem.h
index 7016847..e1d88d5 100644
--- a/glib/gmem.h
+++ b/glib/gmem.h
@@ -12,31 +12,50 @@
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the
- * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
- * Boston, MA 02111-1307, USA.
+ * License along with this library; if not, see .
*/
/*
* Modified by the GLib Team and others 1997-2000. See the AUTHORS
* file for a list of people on the GLib Team. See the ChangeLog
* files for a list of changes. These files are distributed with
- * GLib at ftp://ftp.gtk.org/pub/gtk/.
+ * GLib at ftp://ftp.gtk.org/pub/gtk/.
*/
#ifndef __G_MEM_H__
#define __G_MEM_H__
+#if !defined (__GLIB_H_INSIDE__) && !defined (GLIB_COMPILATION)
+#error "Only can be included directly."
+#endif
+
#include
G_BEGIN_DECLS
-typedef struct _GAllocator GAllocator;
-typedef struct _GMemChunk GMemChunk;
+/**
+ * GMemVTable:
+ * @malloc: function to use for allocating memory.
+ * @realloc: function to use for reallocating memory.
+ * @free: function to use to free memory.
+ * @calloc: function to use for allocating zero-filled memory.
+ * @try_malloc: function to use for allocating memory without a default error handler.
+ * @try_realloc: function to use for reallocating memory without a default error handler.
+ *
+ * A set of functions used to perform memory allocation. The same #GMemVTable must
+ * be used for all allocations in the same program; a call to g_mem_set_vtable(),
+ * if it exists, should be prior to any use of GLib.
+ */
typedef struct _GMemVTable GMemVTable;
#if GLIB_SIZEOF_VOID_P > GLIB_SIZEOF_LONG
+/**
+ * G_MEM_ALIGN:
+ *
+ * Indicates the number of bytes to which memory will be aligned on the
+ * current platform.
+ */
# define G_MEM_ALIGN GLIB_SIZEOF_VOID_P
#else /* GLIB_SIZEOF_VOID_P <= GLIB_SIZEOF_LONG */
# define G_MEM_ALIGN GLIB_SIZEOF_LONG
@@ -45,32 +64,212 @@ typedef struct _GMemVTable GMemVTable;
/* Memory allocation functions
*/
-gpointer g_malloc (gulong n_bytes);
-gpointer g_malloc0 (gulong n_bytes);
-gpointer g_realloc (gpointer mem,
- gulong n_bytes);
+
+GLIB_AVAILABLE_IN_ALL
void g_free (gpointer mem);
-gpointer g_try_malloc (gulong n_bytes);
+
+GLIB_AVAILABLE_IN_2_34
+void g_clear_pointer (gpointer *pp,
+ GDestroyNotify destroy);
+
+GLIB_AVAILABLE_IN_ALL
+gpointer g_malloc (gsize n_bytes) G_GNUC_MALLOC G_GNUC_ALLOC_SIZE(1);
+GLIB_AVAILABLE_IN_ALL
+gpointer g_malloc0 (gsize n_bytes) G_GNUC_MALLOC G_GNUC_ALLOC_SIZE(1);
+GLIB_AVAILABLE_IN_ALL
+gpointer g_realloc (gpointer mem,
+ gsize n_bytes) G_GNUC_WARN_UNUSED_RESULT;
+GLIB_AVAILABLE_IN_ALL
+gpointer g_try_malloc (gsize n_bytes) G_GNUC_MALLOC G_GNUC_ALLOC_SIZE(1);
+GLIB_AVAILABLE_IN_ALL
+gpointer g_try_malloc0 (gsize n_bytes) G_GNUC_MALLOC G_GNUC_ALLOC_SIZE(1);
+GLIB_AVAILABLE_IN_ALL
gpointer g_try_realloc (gpointer mem,
- gulong n_bytes);
+ gsize n_bytes) G_GNUC_WARN_UNUSED_RESULT;
+GLIB_AVAILABLE_IN_ALL
+gpointer g_malloc_n (gsize n_blocks,
+ gsize n_block_bytes) G_GNUC_MALLOC G_GNUC_ALLOC_SIZE2(1,2);
+GLIB_AVAILABLE_IN_ALL
+gpointer g_malloc0_n (gsize n_blocks,
+ gsize n_block_bytes) G_GNUC_MALLOC G_GNUC_ALLOC_SIZE2(1,2);
+GLIB_AVAILABLE_IN_ALL
+gpointer g_realloc_n (gpointer mem,
+ gsize n_blocks,
+ gsize n_block_bytes) G_GNUC_WARN_UNUSED_RESULT;
+GLIB_AVAILABLE_IN_ALL
+gpointer g_try_malloc_n (gsize n_blocks,
+ gsize n_block_bytes) G_GNUC_MALLOC G_GNUC_ALLOC_SIZE2(1,2);
+GLIB_AVAILABLE_IN_ALL
+gpointer g_try_malloc0_n (gsize n_blocks,
+ gsize n_block_bytes) G_GNUC_MALLOC G_GNUC_ALLOC_SIZE2(1,2);
+GLIB_AVAILABLE_IN_ALL
+gpointer g_try_realloc_n (gpointer mem,
+ gsize n_blocks,
+ gsize n_block_bytes) G_GNUC_WARN_UNUSED_RESULT;
-/* Convenience memory allocators
+#define g_clear_pointer(pp, destroy) \
+ G_STMT_START { \
+ G_STATIC_ASSERT (sizeof *(pp) == sizeof (gpointer)); \
+ /* Only one access, please */ \
+ gpointer *_pp = (gpointer *) (pp); \
+ gpointer _p; \
+ /* This assignment is needed to avoid a gcc warning */ \
+ GDestroyNotify _destroy = (GDestroyNotify) (destroy); \
+ \
+ (void) (0 ? (gpointer) *(pp) : 0); \
+ do \
+ _p = g_atomic_pointer_get (_pp); \
+ while G_UNLIKELY (!g_atomic_pointer_compare_and_exchange (_pp, _p, NULL)); \
+ \
+ if (_p) \
+ _destroy (_p); \
+ } G_STMT_END
+
+/* Optimise: avoid the call to the (slower) _n function if we can
+ * determine at compile-time that no overflow happens.
+ */
+#if defined (__GNUC__) && (__GNUC__ >= 2) && defined (__OPTIMIZE__)
+# define _G_NEW(struct_type, n_structs, func) \
+ (struct_type *) (G_GNUC_EXTENSION ({ \
+ gsize __n = (gsize) (n_structs); \
+ gsize __s = sizeof (struct_type); \
+ gpointer __p; \
+ if (__s == 1) \
+ __p = g_##func (__n); \
+ else if (__builtin_constant_p (__n) && \
+ (__s == 0 || __n <= G_MAXSIZE / __s)) \
+ __p = g_##func (__n * __s); \
+ else \
+ __p = g_##func##_n (__n, __s); \
+ __p; \
+ }))
+# define _G_RENEW(struct_type, mem, n_structs, func) \
+ (struct_type *) (G_GNUC_EXTENSION ({ \
+ gsize __n = (gsize) (n_structs); \
+ gsize __s = sizeof (struct_type); \
+ gpointer __p = (gpointer) (mem); \
+ if (__s == 1) \
+ __p = g_##func (__p, __n); \
+ else if (__builtin_constant_p (__n) && \
+ (__s == 0 || __n <= G_MAXSIZE / __s)) \
+ __p = g_##func (__p, __n * __s); \
+ else \
+ __p = g_##func##_n (__p, __n, __s); \
+ __p; \
+ }))
+
+#else
+
+/* Unoptimised version: always call the _n() function. */
+
+#define _G_NEW(struct_type, n_structs, func) \
+ ((struct_type *) g_##func##_n ((n_structs), sizeof (struct_type)))
+#define _G_RENEW(struct_type, mem, n_structs, func) \
+ ((struct_type *) g_##func##_n (mem, (n_structs), sizeof (struct_type)))
+
+#endif
+
+/**
+ * g_new:
+ * @struct_type: the type of the elements to allocate
+ * @n_structs: the number of elements to allocate
+ *
+ * Allocates @n_structs elements of type @struct_type.
+ * The returned pointer is cast to a pointer to the given type.
+ * If @n_structs is 0 it returns %NULL.
+ * Care is taken to avoid overflow when calculating the size of the allocated block.
+ *
+ * Since the returned pointer is already casted to the right type,
+ * it is normally unnecessary to cast it explicitly, and doing
+ * so might hide memory allocation errors.
+ *
+ * Returns: a pointer to the allocated memory, cast to a pointer to @struct_type
+ */
+#define g_new(struct_type, n_structs) _G_NEW (struct_type, n_structs, malloc)
+/**
+ * g_new0:
+ * @struct_type: the type of the elements to allocate.
+ * @n_structs: the number of elements to allocate.
+ *
+ * Allocates @n_structs elements of type @struct_type, initialized to 0's.
+ * The returned pointer is cast to a pointer to the given type.
+ * If @n_structs is 0 it returns %NULL.
+ * Care is taken to avoid overflow when calculating the size of the allocated block.
+ *
+ * Since the returned pointer is already casted to the right type,
+ * it is normally unnecessary to cast it explicitly, and doing
+ * so might hide memory allocation errors.
+ *
+ * Returns: a pointer to the allocated memory, cast to a pointer to @struct_type.
+ */
+#define g_new0(struct_type, n_structs) _G_NEW (struct_type, n_structs, malloc0)
+/**
+ * g_renew:
+ * @struct_type: the type of the elements to allocate
+ * @mem: the currently allocated memory
+ * @n_structs: the number of elements to allocate
+ *
+ * Reallocates the memory pointed to by @mem, so that it now has space for
+ * @n_structs elements of type @struct_type. It returns the new address of
+ * the memory, which may have been moved.
+ * Care is taken to avoid overflow when calculating the size of the allocated block.
+ *
+ * Returns: a pointer to the new allocated memory, cast to a pointer to @struct_type
*/
-#define g_new(struct_type, n_structs) \
- ((struct_type *) g_malloc (((gsize) sizeof (struct_type)) * ((gsize) (n_structs))))
-#define g_new0(struct_type, n_structs) \
- ((struct_type *) g_malloc0 (((gsize) sizeof (struct_type)) * ((gsize) (n_structs))))
-#define g_renew(struct_type, mem, n_structs) \
- ((struct_type *) g_realloc ((mem), ((gsize) sizeof (struct_type)) * ((gsize) (n_structs))))
+#define g_renew(struct_type, mem, n_structs) _G_RENEW (struct_type, mem, n_structs, realloc)
+/**
+ * g_try_new:
+ * @struct_type: the type of the elements to allocate
+ * @n_structs: the number of elements to allocate
+ *
+ * Attempts to allocate @n_structs elements of type @struct_type, and returns
+ * %NULL on failure. Contrast with g_new(), which aborts the program on failure.
+ * The returned pointer is cast to a pointer to the given type.
+ * The function returns %NULL when @n_structs is 0 of if an overflow occurs.
+ *
+ * Since: 2.8
+ * Returns: a pointer to the allocated memory, cast to a pointer to @struct_type
+ */
+#define g_try_new(struct_type, n_structs) _G_NEW (struct_type, n_structs, try_malloc)
+/**
+ * g_try_new0:
+ * @struct_type: the type of the elements to allocate
+ * @n_structs: the number of elements to allocate
+ *
+ * Attempts to allocate @n_structs elements of type @struct_type, initialized
+ * to 0's, and returns %NULL on failure. Contrast with g_new0(), which aborts
+ * the program on failure.
+ * The returned pointer is cast to a pointer to the given type.
+ * The function returns %NULL when @n_structs is 0 of if an overflow occurs.
+ *
+ * Since: 2.8
+ * Returns: a pointer to the allocated memory, cast to a pointer to @struct_type
+ */
+#define g_try_new0(struct_type, n_structs) _G_NEW (struct_type, n_structs, try_malloc0)
+/**
+ * g_try_renew:
+ * @struct_type: the type of the elements to allocate
+ * @mem: the currently allocated memory
+ * @n_structs: the number of elements to allocate
+ *
+ * Attempts to reallocate the memory pointed to by @mem, so that it now has
+ * space for @n_structs elements of type @struct_type, and returns %NULL on
+ * failure. Contrast with g_renew(), which aborts the program on failure.
+ * It returns the new address of the memory, which may have been moved.
+ * The function returns %NULL if an overflow occurs.
+ *
+ * Since: 2.8
+ * Returns: a pointer to the new allocated memory, cast to a pointer to @struct_type
+ */
+#define g_try_renew(struct_type, mem, n_structs) _G_RENEW (struct_type, mem, n_structs, try_realloc)
/* Memory allocation virtualization for debugging purposes
* g_mem_set_vtable() has to be the very first GLib function called
* if being used
*/
-struct _GMemVTable
-{
+struct _GMemVTable {
gpointer (*malloc) (gsize n_bytes);
gpointer (*realloc) (gpointer mem,
gsize n_bytes);
@@ -82,93 +281,19 @@ struct _GMemVTable
gpointer (*try_realloc) (gpointer mem,
gsize n_bytes);
};
+GLIB_AVAILABLE_IN_ALL
void g_mem_set_vtable (GMemVTable *vtable);
+GLIB_AVAILABLE_IN_ALL
gboolean g_mem_is_system_malloc (void);
+GLIB_VAR gboolean g_mem_gc_friendly;
+
/* Memory profiler and checker, has to be enabled via g_mem_set_vtable()
*/
GLIB_VAR GMemVTable *glib_mem_profiler_table;
+GLIB_AVAILABLE_IN_ALL
void g_mem_profile (void);
-
-/* Memchunk convenience functions
- */
-#define g_mem_chunk_create(type, pre_alloc, alloc_type) ( \
- g_mem_chunk_new (#type " mem chunks (" #pre_alloc ")", \
- sizeof (type), \
- sizeof (type) * (pre_alloc), \
- (alloc_type)) \
-)
-#define g_chunk_new(type, chunk) ( \
- (type *) g_mem_chunk_alloc (chunk) \
-)
-#define g_chunk_new0(type, chunk) ( \
- (type *) g_mem_chunk_alloc0 (chunk) \
-)
-#define g_chunk_free(mem, mem_chunk) G_STMT_START { \
- g_mem_chunk_free ((mem_chunk), (mem)); \
-} G_STMT_END
-
-
-/* "g_mem_chunk_new" creates a new memory chunk.
- * Memory chunks are used to allocate pieces of memory which are
- * always the same size. Lists are a good example of such a data type.
- * The memory chunk allocates and frees blocks of memory as needed.
- * Just be sure to call "g_mem_chunk_free" and not "g_free" on data
- * allocated in a mem chunk. ("g_free" will most likely cause a seg
- * fault...somewhere).
- *
- * Oh yeah, GMemChunk is an opaque data type. (You don't really
- * want to know what's going on inside do you?)
- */
-
-/* ALLOC_ONLY MemChunk's can only allocate memory. The free operation
- * is interpreted as a no op. ALLOC_ONLY MemChunk's save 4 bytes per
- * atom. (They are also useful for lists which use MemChunk to allocate
- * memory but are also part of the MemChunk implementation).
- * ALLOC_AND_FREE MemChunk's can allocate and free memory.
- */
-
-#define G_ALLOC_ONLY 1
-#define G_ALLOC_AND_FREE 2
-
-GMemChunk* g_mem_chunk_new (const gchar *name,
- gint atom_size,
- gulong area_size,
- gint type);
-void g_mem_chunk_destroy (GMemChunk *mem_chunk);
-gpointer g_mem_chunk_alloc (GMemChunk *mem_chunk);
-gpointer g_mem_chunk_alloc0 (GMemChunk *mem_chunk);
-void g_mem_chunk_free (GMemChunk *mem_chunk,
- gpointer mem);
-void g_mem_chunk_clean (GMemChunk *mem_chunk);
-void g_mem_chunk_reset (GMemChunk *mem_chunk);
-void g_mem_chunk_print (GMemChunk *mem_chunk);
-void g_mem_chunk_info (void);
-
-/* Ah yes...we have a "g_blow_chunks" function.
- * "g_blow_chunks" simply compresses all the chunks. This operation
- * consists of freeing every memory area that should be freed (but
- * which we haven't gotten around to doing yet). And, no,
- * "g_blow_chunks" doesn't follow the naming scheme, but it is a
- * much better name than "g_mem_chunk_clean_all" or something
- * similar.
- */
-void g_blow_chunks (void);
-
-
-/* Generic allocators
- */
-GAllocator* g_allocator_new (const gchar *name,
- guint n_preallocs);
-void g_allocator_free (GAllocator *allocator);
-
-/* internal */
-#define G_ALLOCATOR_LIST (1)
-#define G_ALLOCATOR_SLIST (2)
-#define G_ALLOCATOR_NODE (3)
-
-
G_END_DECLS
#endif /* __G_MEM_H__ */