1
2 #pragma ident "%Z%%M% %I% %E% SMI"
3
4 /*
5 ** 2002 January 15
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 ** Testing the thread safety of SQLite is difficult because there are very
19 ** few places in the code that are even potentially unsafe, and those
20 ** places execute for very short periods of time. So even if the library
21 ** is compiled with its mutexes disabled, it is likely to work correctly
22 ** in a multi-threaded program most of the time.
23 **
24 ** This file is NOT part of the standard SQLite library. It is used for
25 ** testing only.
26 */
27 #include "sqlite.h"
28 #include <pthread.h>
29 #include <sched.h>
30 #include <stdio.h>
31 #include <stdlib.h>
32 #include <string.h>
33 #include <unistd.h>
34
35 /*
36 ** Enable for tracing
37 */
38 static int verbose = 0;
39
40 /*
41 ** Come here to die.
42 */
Exit(int rc)43 static void Exit(int rc){
44 exit(rc);
45 }
46
47 extern char *sqlite_mprintf(const char *zFormat, ...);
48 extern char *sqlite_vmprintf(const char *zFormat, va_list);
49
50 /*
51 ** When a lock occurs, yield.
52 */
db_is_locked(void * NotUsed,const char * zNotUsed,int iNotUsed)53 static int db_is_locked(void *NotUsed, const char *zNotUsed, int iNotUsed){
54 /* sched_yield(); */
55 if( verbose ) printf("BUSY %s\n", (char*)NotUsed);
56 usleep(100);
57 return 1;
58 }
59
60 /*
61 ** Used to accumulate query results by db_query()
62 */
63 struct QueryResult {
64 const char *zFile; /* Filename - used for error reporting */
65 int nElem; /* Number of used entries in azElem[] */
66 int nAlloc; /* Number of slots allocated for azElem[] */
67 char **azElem; /* The result of the query */
68 };
69
70 /*
71 ** The callback function for db_query
72 */
db_query_callback(void * pUser,int nArg,char ** azArg,char ** NotUsed)73 static int db_query_callback(
74 void *pUser, /* Pointer to the QueryResult structure */
75 int nArg, /* Number of columns in this result row */
76 char **azArg, /* Text of data in all columns */
77 char **NotUsed /* Names of the columns */
78 ){
79 struct QueryResult *pResult = (struct QueryResult*)pUser;
80 int i;
81 if( pResult->nElem + nArg >= pResult->nAlloc ){
82 if( pResult->nAlloc==0 ){
83 pResult->nAlloc = nArg+1;
84 }else{
85 pResult->nAlloc = pResult->nAlloc*2 + nArg + 1;
86 }
87 pResult->azElem = realloc( pResult->azElem, pResult->nAlloc*sizeof(char*));
88 if( pResult->azElem==0 ){
89 fprintf(stdout,"%s: malloc failed\n", pResult->zFile);
90 return 1;
91 }
92 }
93 if( azArg==0 ) return 0;
94 for(i=0; i<nArg; i++){
95 pResult->azElem[pResult->nElem++] =
96 sqlite_mprintf("%s",azArg[i] ? azArg[i] : "");
97 }
98 return 0;
99 }
100
101 /*
102 ** Execute a query against the database. NULL values are returned
103 ** as an empty string. The list is terminated by a single NULL pointer.
104 */
db_query(sqlite * db,const char * zFile,const char * zFormat,...)105 char **db_query(sqlite *db, const char *zFile, const char *zFormat, ...){
106 char *zSql;
107 int rc;
108 char *zErrMsg = 0;
109 va_list ap;
110 struct QueryResult sResult;
111 va_start(ap, zFormat);
112 zSql = sqlite_vmprintf(zFormat, ap);
113 va_end(ap);
114 memset(&sResult, 0, sizeof(sResult));
115 sResult.zFile = zFile;
116 if( verbose ) printf("QUERY %s: %s\n", zFile, zSql);
117 rc = sqlite_exec(db, zSql, db_query_callback, &sResult, &zErrMsg);
118 if( rc==SQLITE_SCHEMA ){
119 if( zErrMsg ) free(zErrMsg);
120 rc = sqlite_exec(db, zSql, db_query_callback, &sResult, &zErrMsg);
121 }
122 if( verbose ) printf("DONE %s %s\n", zFile, zSql);
123 if( zErrMsg ){
124 fprintf(stdout,"%s: query failed: %s - %s\n", zFile, zSql, zErrMsg);
125 free(zErrMsg);
126 free(zSql);
127 Exit(1);
128 }
129 sqlite_freemem(zSql);
130 if( sResult.azElem==0 ){
131 db_query_callback(&sResult, 0, 0, 0);
132 }
133 sResult.azElem[sResult.nElem] = 0;
134 return sResult.azElem;
135 }
136
137 /*
138 ** Execute an SQL statement.
139 */
db_execute(sqlite * db,const char * zFile,const char * zFormat,...)140 void db_execute(sqlite *db, const char *zFile, const char *zFormat, ...){
141 char *zSql;
142 int rc;
143 char *zErrMsg = 0;
144 va_list ap;
145 va_start(ap, zFormat);
146 zSql = sqlite_vmprintf(zFormat, ap);
147 va_end(ap);
148 if( verbose ) printf("EXEC %s: %s\n", zFile, zSql);
149 rc = sqlite_exec(db, zSql, 0, 0, &zErrMsg);
150 while( rc==SQLITE_SCHEMA ){
151 if( zErrMsg ) free(zErrMsg);
152 rc = sqlite_exec(db, zSql, 0, 0, &zErrMsg);
153 }
154 if( verbose ) printf("DONE %s: %s\n", zFile, zSql);
155 if( zErrMsg ){
156 fprintf(stdout,"%s: command failed: %s - %s\n", zFile, zSql, zErrMsg);
157 free(zErrMsg);
158 sqlite_freemem(zSql);
159 Exit(1);
160 }
161 sqlite_freemem(zSql);
162 }
163
164 /*
165 ** Free the results of a db_query() call.
166 */
db_query_free(char ** az)167 void db_query_free(char **az){
168 int i;
169 for(i=0; az[i]; i++){
170 sqlite_freemem(az[i]);
171 }
172 free(az);
173 }
174
175 /*
176 ** Check results
177 */
db_check(const char * zFile,const char * zMsg,char ** az,...)178 void db_check(const char *zFile, const char *zMsg, char **az, ...){
179 va_list ap;
180 int i;
181 char *z;
182 va_start(ap, az);
183 for(i=0; (z = va_arg(ap, char*))!=0; i++){
184 if( az[i]==0 || strcmp(az[i],z)!=0 ){
185 fprintf(stdout,"%s: %s: bad result in column %d: %s\n",
186 zFile, zMsg, i+1, az[i]);
187 db_query_free(az);
188 Exit(1);
189 }
190 }
191 va_end(ap);
192 db_query_free(az);
193 }
194
195 pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER;
196 pthread_cond_t sig = PTHREAD_COND_INITIALIZER;
197 int thread_cnt = 0;
198
worker_bee(void * pArg)199 static void *worker_bee(void *pArg){
200 const char *zFilename = (char*)pArg;
201 char *azErr;
202 int i, cnt;
203 int t = atoi(zFilename);
204 char **az;
205 sqlite *db;
206
207 pthread_mutex_lock(&lock);
208 thread_cnt++;
209 pthread_mutex_unlock(&lock);
210 printf("%s: START\n", zFilename);
211 fflush(stdout);
212 for(cnt=0; cnt<10; cnt++){
213 db = sqlite_open(&zFilename[2], 0, &azErr);
214 if( db==0 ){
215 fprintf(stdout,"%s: can't open\n", zFilename);
216 Exit(1);
217 }
218 sqlite_busy_handler(db, db_is_locked, zFilename);
219 db_execute(db, zFilename, "CREATE TABLE t%d(a,b,c);", t);
220 for(i=1; i<=100; i++){
221 db_execute(db, zFilename, "INSERT INTO t%d VALUES(%d,%d,%d);",
222 t, i, i*2, i*i);
223 }
224 az = db_query(db, zFilename, "SELECT count(*) FROM t%d", t);
225 db_check(zFilename, "tX size", az, "100", 0);
226 az = db_query(db, zFilename, "SELECT avg(b) FROM t%d", t);
227 db_check(zFilename, "tX avg", az, "101", 0);
228 db_execute(db, zFilename, "DELETE FROM t%d WHERE a>50", t);
229 az = db_query(db, zFilename, "SELECT avg(b) FROM t%d", t);
230 db_check(zFilename, "tX avg2", az, "51", 0);
231 for(i=1; i<=50; i++){
232 char z1[30], z2[30];
233 az = db_query(db, zFilename, "SELECT b, c FROM t%d WHERE a=%d", t, i);
234 sprintf(z1, "%d", i*2);
235 sprintf(z2, "%d", i*i);
236 db_check(zFilename, "readback", az, z1, z2, 0);
237 }
238 db_execute(db, zFilename, "DROP TABLE t%d;", t);
239 sqlite_close(db);
240 }
241 printf("%s: END\n", zFilename);
242 /* unlink(zFilename); */
243 fflush(stdout);
244 pthread_mutex_lock(&lock);
245 thread_cnt--;
246 if( thread_cnt<=0 ){
247 pthread_cond_signal(&sig);
248 }
249 pthread_mutex_unlock(&lock);
250 return 0;
251 }
252
main(int argc,char ** argv)253 int main(int argc, char **argv){
254 char *zFile;
255 int i, n;
256 pthread_t id;
257 if( argc>2 && strcmp(argv[1], "-v")==0 ){
258 verbose = 1;
259 argc--;
260 argv++;
261 }
262 if( argc<2 || (n=atoi(argv[1]))<1 ) n = 10;
263 for(i=0; i<n; i++){
264 char zBuf[200];
265 sprintf(zBuf, "testdb-%d", (i+1)/2);
266 unlink(zBuf);
267 }
268 for(i=0; i<n; i++){
269 zFile = sqlite_mprintf("%d.testdb-%d", i%2+1, (i+2)/2);
270 unlink(zFile);
271 pthread_create(&id, 0, worker_bee, (void*)zFile);
272 pthread_detach(id);
273 }
274 pthread_mutex_lock(&lock);
275 while( thread_cnt>0 ){
276 pthread_cond_wait(&sig, &lock);
277 }
278 pthread_mutex_unlock(&lock);
279 for(i=0; i<n; i++){
280 char zBuf[200];
281 sprintf(zBuf, "testdb-%d", (i+1)/2);
282 unlink(zBuf);
283 }
284 return 0;
285 }
286