Added pool for allocating memory from the stack buffer

git-svn-id: http://svn.pjsip.org/repos/pjproject/trunk@725 74dad513-b988-da41-8d7b-12977e46ad98

1 files changed, 77 insertions, 0 deletions

diff --git a/pjlib/src/pj/pool_buf.c b/pjlib/src/pj/pool_buf.c
new file mode 100644
index 00000000..13c9821a
--- /dev/null
+++ b/pjlib/src/pj/pool_buf.c
@@ -0,0 +1,77 @@
+/* $Id$ */
+/* 
+ * Copyright (C)2003-2006 Benny Prijono <benny@prijono.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA 
+ */
+#include <pj/pool_buf.h>
+#include <pj/assert.h>
+#include <pj/os.h>
+
+struct pj_pool_factory stack_based_factory;
+
+struct creation_param
+{
+    void	*stack_buf;
+    pj_size_t	 size;
+};
+
+static int is_initialized;
+static long tls;
+static void* stack_alloc(pj_pool_factory *factory, pj_size_t size);
+
+static pj_status_t initialize()
+{
+    stack_based_factory.policy.block_alloc = &stack_alloc;
+    return pj_thread_local_alloc(&tls);
+}
+
+static void* stack_alloc(pj_pool_factory *factory, pj_size_t size)
+{
+    struct creation_param *param;
+
+    PJ_UNUSED_ARG(factory);
+
+    param = pj_thread_local_get(tls);
+    PJ_ASSERT_RETURN(param != NULL, NULL);
+
+    pj_thread_local_set(tls, NULL);
+
+    PJ_ASSERT_RETURN(size <= param->size, NULL);
+
+    return param->stack_buf;
+}
+
+
+PJ_DEF(pj_pool_t*) pj_pool_create_on_buf(const char *name,
+					 void *buf,
+					 pj_size_t size)
+{
+    struct creation_param param;
+
+    PJ_ASSERT_RETURN(buf && size, NULL);
+
+    if (!is_initialized) {
+	if (initialize() != PJ_SUCCESS)
+	    return NULL;
+    }
+
+    param.stack_buf = buf;
+    param.size = size;
+    pj_thread_local_set(tls, &param);
+
+    return pj_pool_create_int(&stack_based_factory, name, size, 0, NULL);
+}
+