Import pjproject-2.0.1

1 files changed, 115 insertions, 0 deletions

diff --git a/pjlib/src/pj/pool_buf.c b/pjlib/src/pj/pool_buf.c
new file mode 100644
index 0000000..b9044b2
--- /dev/null
+++ b/pjlib/src/pj/pool_buf.c
@@ -0,0 +1,115 @@
+/* $Id: pool_buf.c 3553 2011-05-05 06:14:19Z nanang $ */
+/* 
+ * Copyright (C) 2008-2011 Teluu Inc. (http://www.teluu.com)
+ * Copyright (C) 2003-2008 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 = -1;
+static void* stack_alloc(pj_pool_factory *factory, pj_size_t size);
+
+static void pool_buf_cleanup(void)
+{
+    if (tls != -1) {
+	pj_thread_local_free(tls);
+	tls = -1;
+    }
+    if (is_initialized)
+	is_initialized = 0;
+}
+
+static pj_status_t pool_buf_initialize()
+{
+    pj_atexit(&pool_buf_cleanup);
+
+    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;
+    void *buf;
+
+    PJ_UNUSED_ARG(factory);
+
+    param = (struct creation_param*) pj_thread_local_get(tls);
+    if (param == NULL) {
+	/* Don't assert(), this is normal no-memory situation */
+	return NULL;
+    }
+
+    pj_thread_local_set(tls, NULL);
+
+    PJ_ASSERT_RETURN(size <= param->size, NULL);
+
+    buf = param->stack_buf;
+
+    /* Prevent the buffer from being reused */
+    param->stack_buf = NULL;
+
+    return buf;
+}
+
+
+PJ_DEF(pj_pool_t*) pj_pool_create_on_buf(const char *name,
+					 void *buf,
+					 pj_size_t size)
+{
+#if PJ_HAS_POOL_ALT_API == 0
+    struct creation_param param;
+    long align_diff;
+
+    PJ_ASSERT_RETURN(buf && size, NULL);
+
+    if (!is_initialized) {
+	if (pool_buf_initialize() != PJ_SUCCESS)
+	    return NULL;
+	is_initialized = 1;
+    }
+
+    /* Check and align buffer */
+    align_diff = (long)buf;
+    if (align_diff & (PJ_POOL_ALIGNMENT-1)) {
+	align_diff &= (PJ_POOL_ALIGNMENT-1);
+	buf = (void*) (((char*)buf) + align_diff);
+	size -= align_diff;
+    }
+
+    param.stack_buf = buf;
+    param.size = size;
+    pj_thread_local_set(tls, &param);
+
+    return pj_pool_create_int(&stack_based_factory, name, size, 0, 
+			      pj_pool_factory_default_policy.callback);
+#else
+    PJ_UNUSED_ARG(buf);
+    return pj_pool_create(NULL, name, size, size, NULL);
+#endif
+}
+