usr/src/lib/libsqlite/test/threadtest1.c

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