Stephan Sundermann
e653ac87a2
x86 might not work due to misconfiguration because I could not test it since acinerella is broken in x86 currenty. Gstreamer video support is yet to follow. Please report back any bugs you experience. To compile you will need Visual C++, I hope all files are included
113 lines
4.4 KiB
C
113 lines
4.4 KiB
C
/* GLIB - Library of useful routines for C programming
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* Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
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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 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, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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/*
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* Modified by the GLib Team and others 1997-2000. See the AUTHORS
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* file for a list of people on the GLib Team. See the ChangeLog
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* files for a list of changes. These files are distributed with
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* GLib at ftp://ftp.gtk.org/pub/gtk/.
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*/
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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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#ifndef __G_ALLOCA_H__
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#define __G_ALLOCA_H__
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#include <glib/gtypes.h>
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#if defined(__BIONIC__) && defined (GLIB_HAVE_ALLOCA_H)
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# include <alloca.h>
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#elif defined(__GNUC__)
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/* GCC does the right thing */
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# undef alloca
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# define alloca(size) __builtin_alloca (size)
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#elif defined (GLIB_HAVE_ALLOCA_H)
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/* a native and working alloca.h is there */
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# include <alloca.h>
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#else /* !__GNUC__ && !GLIB_HAVE_ALLOCA_H */
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# if defined(_MSC_VER) || defined(__DMC__)
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# include <malloc.h>
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# define alloca _alloca
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# else /* !_MSC_VER && !__DMC__ */
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# ifdef _AIX
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# pragma alloca
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# else /* !_AIX */
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# ifndef alloca /* predefined by HP cc +Olibcalls */
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G_BEGIN_DECLS
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char *alloca ();
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G_END_DECLS
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# endif /* !alloca */
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# endif /* !_AIX */
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# endif /* !_MSC_VER && !__DMC__ */
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#endif /* !__GNUC__ && !GLIB_HAVE_ALLOCA_H */
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/**
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* g_alloca:
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* @size: number of bytes to allocate.
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*
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* Allocates @size bytes on the stack; these bytes will be freed when the current
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* stack frame is cleaned up. This macro essentially just wraps the alloca()
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* function present on most UNIX variants.
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* Thus it provides the same advantages and pitfalls as alloca():
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* <variablelist>
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* <varlistentry><term></term><listitem><para>
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* + alloca() is very fast, as on most systems it's implemented by just adjusting
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* the stack pointer register.
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* </para></listitem></varlistentry>
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* <varlistentry><term></term><listitem><para>
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* + It doesn't cause any memory fragmentation, within its scope, separate alloca()
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* blocks just build up and are released together at function end.
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* </para></listitem></varlistentry>
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* <varlistentry><term></term><listitem><para>
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* - Allocation sizes have to fit into the current stack frame. For instance in a
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* threaded environment on Linux, the per-thread stack size is limited to 2 Megabytes,
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* so be sparse with alloca() uses.
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* </para></listitem></varlistentry>
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* <varlistentry><term></term><listitem><para>
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* - Allocation failure due to insufficient stack space is not indicated with a %NULL
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* return like e.g. with malloc(). Instead, most systems probably handle it the same
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* way as out of stack space situations from infinite function recursion, i.e.
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* with a segmentation fault.
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* </para></listitem></varlistentry>
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* <varlistentry><term></term><listitem><para>
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* - Special care has to be taken when mixing alloca() with GNU C variable sized arrays.
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* Stack space allocated with alloca() in the same scope as a variable sized array
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* will be freed together with the variable sized array upon exit of that scope, and
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* not upon exit of the enclosing function scope.
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* </para></listitem></varlistentry>
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* </variablelist>
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*
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* Returns: space for @size bytes, allocated on the stack
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*/
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#define g_alloca(size) alloca (size)
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/**
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* g_newa:
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* @struct_type: Type of memory chunks to be allocated
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* @n_structs: Number of chunks to be allocated
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*
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* Wraps g_alloca() in a more typesafe manner.
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*
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* Returns: Pointer to stack space for @n_structs chunks of type @struct_type
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*/
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#define g_newa(struct_type, n_structs) ((struct_type*) g_alloca (sizeof (struct_type) * (gsize) (n_structs)))
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#endif /* __G_ALLOCA_H__ */
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