--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/audio/SDL_audiomem.c	Thu Apr 26 16:45:43 2001 +0000
@@ -0,0 +1,73 @@
+/*
+    SDL - Simple DirectMedia Layer
+    Copyright (C) 1997, 1998, 1999, 2000, 2001  Sam Lantinga
+
+    This library is free software; you can redistribute it and/or
+    modify it under the terms of the GNU Library General Public
+    License as published by the Free Software Foundation; either
+    version 2 of the License, or (at your option) any later version.
+
+    This library is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+    Library General Public License for more details.
+
+    You should have received a copy of the GNU Library General Public
+    License along with this library; if not, write to the Free
+    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+    Sam Lantinga
+    slouken@devolution.com
+*/
+
+#ifdef SAVE_RCSID
+static char rcsid =
+ "@(#) $Id$";
+#endif
+
+/* Functions to allocate audio buffer memory, shareable across threads
+	(necessary because SDL audio emulates threads with fork()
+ */
+
+#ifdef FORK_HACK
+#include <sys/types.h>
+#include <sys/ipc.h>
+#include <sys/shm.h>
+#include <stddef.h>
+#else
+#include <stdlib.h>
+#endif
+
+#include "SDL_audiomem.h"
+
+/* Allocate memory that will be shared between threads (freed on exit) */
+void *SDL_AllocAudioMem(int size)
+{
+	void *chunk;
+
+#ifdef FORK_HACK
+	int   semid;
+	
+	/* Create and get the address of a shared memory segment */
+	semid = shmget(IPC_PRIVATE, size, (IPC_CREAT|0600));
+	if ( semid < 0 ) {
+		return(NULL);
+	}
+	chunk = shmat(semid, NULL, 0);
+	
+	/* Set the segment for deletion when it is detatched */
+	shmctl(semid, IPC_RMID, NULL);	/* Delets semid if shmat() fails */
+#else
+	chunk = malloc(size);
+#endif
+	return((void *)chunk);
+}
+
+void SDL_FreeAudioMem(void *chunk)
+{
+#ifdef FORK_HACK
+	shmdt(chunk);
+#else
+	free(chunk);
+#endif
+}