From: Hwankyu Jhun <h.jhun@samsung.com>
Date: Fri, 7 Apr 2017 10:26:21 +0000 (+0900)
Subject: Add widget db busy handler
X-Git-Tag: submit/tizen/20170512.073248~3
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=399bb558eccfca384363db84fcdaead7ed859e78;p=platform%2Fcore%2Fappfw%2Fwidget-service.git

Add widget db busy handler

While some process is writing on the widget db, the widget parser plugin fails
query with SQLITE_BUSY error. This patch is to fix this issue.

Change-Id: I4ed4782656bf6585c3bf6d7389405e23010dcbd2
Signed-off-by: Hwankyu Jhun <h.jhun@samsung.com>
---

diff --git a/parser/widget_plugin_parser_internal.c b/parser/widget_plugin_parser_internal.c
index dc424eb..0ac5335 100644
--- a/parser/widget_plugin_parser_internal.c
+++ b/parser/widget_plugin_parser_internal.c
@@ -26,6 +26,9 @@
 
 #include "widget_plugin_parser_internal.h"
 
+#define BUSY_WAITING_USEC 50000 /* 0.05 sec */
+#define BUSY_WAITING_MAX 20 /* wait for max 1 sec */
+
 void _free_support_size(gpointer data)
 {
 	struct support_size *size = (struct support_size *)data;
@@ -104,6 +107,17 @@ static const char *_get_db_path(uid_t uid)
 	return path;
 }
 
+static int __db_busy_handler(void *data, int count)
+{
+	if (count < BUSY_WAITING_MAX) {
+		usleep(BUSY_WAITING_USEC);
+		return 1;
+	}
+
+	/* sqlite3_prepare_v2 will return SQLITE_BUSY */
+	return 0;
+}
+
 sqlite3 *_open_db(uid_t uid, bool readonly)
 {
 	int ret;
@@ -125,6 +139,14 @@ sqlite3 *_open_db(uid_t uid, bool readonly)
 		return NULL;
 	}
 
+	ret = sqlite3_busy_handler(db, __db_busy_handler, NULL);
+	if (ret != SQLITE_OK) {
+		LOGE("Failed to register busy handler: %s",
+				sqlite3_errmsg(db));
+		sqlite3_close_v2(db);
+		return NULL;
+	}
+
 	/* turn on foreign keys */
 	if (sqlite3_exec(db, "PRAGMA foreign_keys = ON", NULL, NULL, NULL)) {
 		sqlite3_close_v2(db);