1 
2 #pragma ident	"%Z%%M%	%I%	%E% SMI"
3 
4 /*
5 ** 2004 January 13
6 **
7 ** The author disclaims copyright to this source code.  In place of
8 ** a legal notice, here is a blessing:
9 **
10 **    May you do good and not evil.
11 **    May you find forgiveness for yourself and forgive others.
12 **    May you share freely, never taking more than you give.
13 **
14 *************************************************************************
15 ** This file implements a simple standalone program used to test whether
16 ** or not the SQLite library is threadsafe.
17 **
18 ** This file is NOT part of the standard SQLite library.  It is used for
19 ** testing only.
20 */
21 #include <stdio.h>
22 #include <unistd.h>
23 #include <pthread.h>
24 #include <string.h>
25 #include <stdlib.h>
26 #include "sqlite.h"
27 
28 /*
29 ** Name of the database
30 */
31 #define DB_FILE "test.db"
32 
33 /*
34 ** When this variable becomes non-zero, all threads stop
35 ** what they are doing.
36 */
37 volatile int all_stop = 0;
38 
39 /*
40 ** Callback from the integrity check.  If the result is anything other
41 ** than "ok" it means the integrity check has failed.  Set the "all_stop"
42 ** global variable to stop all other activity.  Print the error message
43 ** or print OK if the string "ok" is seen.
44 */
45 int check_callback(void *notUsed, int argc, char **argv, char **notUsed2){
46   if( strcmp(argv[0],"ok") ){
47     all_stop = 1;
48     fprintf(stderr,"pid=%d. %s\n", getpid(), argv[0]);
49   }else{
50     /* fprintf(stderr,"pid=%d. OK\n", getpid()); */
51   }
52   return 0;
53 }
54 
55 /*
56 ** Do an integrity check on the database.  If the first integrity check
57 ** fails, try it a second time.
58 */
59 int integrity_check(sqlite *db){
60   int rc;
61   if( all_stop ) return 0;
62   /* fprintf(stderr,"pid=%d: CHECK\n", getpid()); */
63   rc = sqlite_exec(db, "pragma integrity_check", check_callback, 0, 0);
64   if( rc!=SQLITE_OK && rc!=SQLITE_BUSY ){
65     fprintf(stderr,"pid=%d, Integrity check returns %d\n", getpid(), rc);
66   }
67   if( all_stop ){
68     sqlite_exec(db, "pragma integrity_check", check_callback, 0, 0);
69   }
70   return 0;
71 }
72 
73 /*
74 ** This is the worker thread
75 */
76 void *worker(void *notUsed){
77   sqlite *db;
78   int rc;
79   int cnt = 0;
80   while( !all_stop && cnt++<10000 ){
81     if( cnt%1000==0 ) printf("pid=%d: %d\n", getpid(), cnt);
82     while( (db = sqlite_open(DB_FILE, 0, 0))==0 ) sched_yield();
83     sqlite_exec(db, "PRAGMA synchronous=OFF", 0, 0, 0);
84     integrity_check(db);
85     if( all_stop ){ sqlite_close(db); break; }
86     /* fprintf(stderr, "pid=%d: BEGIN\n", getpid()); */
87     rc = sqlite_exec(db, "INSERT INTO t1 VALUES('bogus data')", 0, 0, 0);
88     /* fprintf(stderr, "pid=%d: END rc=%d\n", getpid(), rc); */
89     sqlite_close(db);
90   }
91   return 0;
92 }
93 
94 /*
95 ** Initialize the database and start the threads
96 */
97 int main(int argc, char **argv){
98   sqlite *db;
99   int i, rc;
100   pthread_t aThread[5];
101 
102   if( strcmp(DB_FILE,":memory:") ) unlink(DB_FILE);
103   db = sqlite_open(DB_FILE, 0, 0);
104   if( db==0 ){
105     fprintf(stderr,"unable to initialize database\n");
106     exit(1);
107   }
108   rc = sqlite_exec(db, "CREATE TABLE t1(x);", 0,0,0);
109   if( rc ){
110     fprintf(stderr,"cannot create table t1: %d\n", rc);
111     exit(1);
112   }
113   sqlite_close(db);
114   for(i=0; i<sizeof(aThread)/sizeof(aThread[0]); i++){
115     pthread_create(&aThread[i], 0, worker, 0);
116   }
117   for(i=0; i<sizeof(aThread)/sizeof(aThread[i]); i++){
118     pthread_join(aThread[i], 0);
119   }
120   if( !all_stop ){
121     printf("Everything seems ok.\n");
122     return 0;
123   }else{
124     printf("We hit an error.\n");
125     return 1;
126   }
127 }
128