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+/* |
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+ * $Id$ |
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+ * |
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+ * Copyright (C) 2005-2006 iptelorg GmbH |
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+ * |
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+ * This file is part of ser, a free SIP server. |
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+ * |
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+ * ser is free software; you can redistribute it and/or modify |
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+ * it under the terms of the GNU General Public License as published by |
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+ * the Free Software Foundation; either version 2 of the License, or |
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+ * (at your option) any later version |
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+ * |
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+ * For a license to use the ser software under conditions |
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+ * other than those described here, or to purchase support for this |
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+ * software, please contact iptel.org by e-mail at the following addresses: |
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+ * info@iptel.org |
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+ * |
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+ * ser 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 |
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+ * GNU General Public License for more details. |
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+ * |
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+ * You should have received a copy of the GNU General Public License |
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+ * along with this program; if not, write to the Free Software |
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+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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+ * |
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+ * History: |
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+ * -------- |
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+ * 2006-06-16 static buffer for select results (mma) |
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+ * each process owns a separate space |
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+ * each request starts using the buffer from the start |
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+ * |
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+ */ |
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+ |
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+#include <stdio.h> |
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+#include <stdlib.h> |
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+#include <string.h> |
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+#include <unistd.h> |
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+#include <ctype.h> |
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+ |
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+#include "dprint.h" |
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+#include "mem/mem.h" |
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+ |
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+/* |
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+ * Placeholder for the buffer |
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+ * |
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+ * two buffers are actually used to cover the different size requests |
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+ * assuming that resize can move the result to newly allocated space |
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+ * and comparing two selects from the script could require two static buffers |
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+ * |
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+ * if more static buffers need to be valid at the same time change |
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+ * the following constant |
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+ */ |
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+ |
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+#define MAX_BUFFERS 2 |
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+#define BUFFER_GRANULARITY 256 |
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+ |
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+typedef struct stat_buffer_ { |
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+ char *b; |
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+ int size; |
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+ int offset; |
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+} stat_buffer_t; |
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+ |
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+static stat_buffer_t buffer[MAX_BUFFERS]; |
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+static int active_buffer=-1; |
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+ |
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+#define ALLOC_SIZE(req_size) (((req_size/BUFFER_GRANULARITY)+1)*BUFFER_GRANULARITY) |
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+ |
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+int allocate_buffer(int req_size) { |
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+ int size=ALLOC_SIZE(req_size); |
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+ |
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+ if (buffer[active_buffer].b == NULL) { |
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+ if ((buffer[active_buffer].b=pkg_malloc(size))==NULL) |
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+ return 0; |
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+ buffer[active_buffer].size=size; |
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+ buffer[active_buffer].offset=0; |
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+ return 1; |
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+ } |
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+ |
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+ active_buffer = (active_buffer?active_buffer:MAX_BUFFERS)-1; |
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+ if (buffer[active_buffer].size >= req_size) { |
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+ buffer[active_buffer].offset = 0; |
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+ return 1; |
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+ } |
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+ |
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+ if (pkg_realloc(buffer[active_buffer].b,size)) { |
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+ buffer[active_buffer].size=size; |
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+ buffer[active_buffer].offset=0; |
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+ return 1; |
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+ } |
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+ |
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+ return 0; |
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+} |
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+ |
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+/* |
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+ * Request for space from buffer |
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+ * |
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+ * Returns: NULL memory allocation failure (no more space) |
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+ * pointer to the space on success |
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+ */ |
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+ |
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+char* get_static_buffer(int req_size) { |
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+ char *p = NULL; |
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+ if ((buffer[active_buffer].size >= buffer[active_buffer].offset + req_size) |
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+ || (allocate_buffer(req_size))) { |
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+ /* enough space in current buffer or allocation successful */ |
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+ p = buffer[active_buffer].b+buffer[active_buffer].offset; |
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+ buffer[active_buffer].offset += req_size; |
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+ return p; |
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+ } |
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+ return NULL; |
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+} |
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+ |
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+/* Internal function - called before request is going to be processed |
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+ * |
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+ * Reset offset to unused space |
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+ */ |
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+ |
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+int reset_static_buffer() { |
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+ int i; |
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+ |
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+ if (active_buffer == -1) { |
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+ memset(buffer, 0, sizeof(buffer)); |
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+ } else { |
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+ for (i=0; i<MAX_BUFFERS; i++) |
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+ buffer[i].offset=0; |
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+ } |
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+ active_buffer=0; |
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+ return 0; |
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+} |
0 | 130 |
new file mode 100644 |
... | ... |
@@ -0,0 +1,54 @@ |
0 |
+/* |
|
1 |
+ * $Id$ |
|
2 |
+ * |
|
3 |
+ * Copyright (C) 2005-2006 iptelorg GmbH |
|
4 |
+ * |
|
5 |
+ * This file is part of ser, a free SIP server. |
|
6 |
+ * |
|
7 |
+ * ser is free software; you can redistribute it and/or modify |
|
8 |
+ * it under the terms of the GNU General Public License as published by |
|
9 |
+ * the Free Software Foundation; either version 2 of the License, or |
|
10 |
+ * (at your option) any later version |
|
11 |
+ * |
|
12 |
+ * For a license to use the ser software under conditions |
|
13 |
+ * other than those described here, or to purchase support for this |
|
14 |
+ * software, please contact iptel.org by e-mail at the following addresses: |
|
15 |
+ * info@iptel.org |
|
16 |
+ * |
|
17 |
+ * ser is distributed in the hope that it will be useful, |
|
18 |
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of |
|
19 |
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
|
20 |
+ * GNU General Public License for more details. |
|
21 |
+ * |
|
22 |
+ * You should have received a copy of the GNU General Public License |
|
23 |
+ * along with this program; if not, write to the Free Software |
|
24 |
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
|
25 |
+ * |
|
26 |
+ * History: |
|
27 |
+ * -------- |
|
28 |
+ * 2006-06-16 static buffer for select results (mma) |
|
29 |
+ * each process owns a separate space |
|
30 |
+ * each request starts using the buffer from the start |
|
31 |
+ * |
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32 |
+ */ |
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33 |
+ |
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34 |
+#ifndef SELECT_BUFFER_H |
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+#define SELECT_BUFFER_H |
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+ |
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+/* |
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+ * Request for space from buffer |
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+ * |
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+ * Returns: NULL memory allocation failure (no more space) |
|
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+ * pointer to the space on success |
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+ */ |
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+ |
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+char* get_static_buffer(int req_size); |
|
45 |
+ |
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46 |
+/* Internal function - called before request is going to be processed |
|
47 |
+ * |
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48 |
+ * Reset offset to unused space |
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49 |
+ */ |
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+ |
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51 |
+int reset_static_buffer(); |
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+ |
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+#endif /* SELECT_BUFFER_H */ |