标题: 测试在多线程下操作sqlite内存数据库 [打印本页] 作者: yulc 时间: 2008-03-22 20:37 标题: 测试在多线程下操作sqlite内存数据库 硬件平台: Linux on vmware6
操作系统：Trustix Linux3
SQLITE: sqlite-3.5.7
以下摘自:http://www.sqlite.org/c3ref/open.html
int sqlite3_open(
const char *filename, /* Database filename (UTF-8) */
sqlite3 **ppDb /* OUT: SQLite db handle */
);
If the filename is ":memory:", then an private
in-memory database is created for the connection. This in-memory
database will vanish when the database connection is closed. Future
version of SQLite might make use of additional special filenames
that begin with the ":" character. It is recommended that
when a database filename really does begin with
":" that you prefix the filename with a pathname like "./" to
avoid ambiguity.
我在主线程中使用
int sqlitehandle = sqlite3_open(":memory:", &pdb);
创建内存数据库，并创建表：
int rs = sqlite3_exec(pdb, "CREATE TABLE testtbl(id int NOT NULL, name varchar(100))", 0, 0,0);
然后创建两个新的线程，将pdb传入线程中，主线程进入睡眠。
在两个线程中，均执行：
while(1) { int rs = sqlite3_exec(pdb, "INSERT INTO testtbl values(25,'aaaaaaaaaaaa')", 0,0,0); printf("rs = %d\n", rs); if(rs != SQLITE_OK) { printf("err rs=%d\n", rs); break; } usleep(10); }
测试结果显示是可以两个线程操作同一个句柄的!!!
并且在程序运行时,我用lsof命令查看该进程的句柄状态,确实没有任何磁盘的操作!!!
但有个问题不知道是否是由于我是虚拟机引起,即该程序在执行（约1分钟后），两个线程像是进入死锁状态，再没有任何动作，没有退出，也没有显示insert失败！这暂时不理解。
