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