sl@0: /*
sl@0: ** 2002 January 15
sl@0: **
sl@0: ** The author disclaims copyright to this source code.  In place of
sl@0: ** a legal notice, here is a blessing:
sl@0: **
sl@0: **    May you do good and not evil.
sl@0: **    May you find forgiveness for yourself and forgive others.
sl@0: **    May you share freely, never taking more than you give.
sl@0: **
sl@0: *************************************************************************
sl@0: ** This file implements a simple standalone program used to test whether
sl@0: ** or not the SQLite library is threadsafe.
sl@0: **
sl@0: ** Testing the thread safety of SQLite is difficult because there are very
sl@0: ** few places in the code that are even potentially unsafe, and those
sl@0: ** places execute for very short periods of time.  So even if the library
sl@0: ** is compiled with its mutexes disabled, it is likely to work correctly
sl@0: ** in a multi-threaded program most of the time.  
sl@0: **
sl@0: ** This file is NOT part of the standard SQLite library.  It is used for
sl@0: ** testing only.
sl@0: */
sl@0: #include "sqlite.h"
sl@0: #include <pthread.h>
sl@0: #include <sched.h>
sl@0: #include <stdio.h>
sl@0: #include <stdlib.h>
sl@0: #include <string.h>
sl@0: #include <unistd.h>
sl@0: 
sl@0: /*
sl@0: ** Enable for tracing
sl@0: */
sl@0: static int verbose = 0;
sl@0: 
sl@0: /*
sl@0: ** Come here to die.
sl@0: */
sl@0: static void Exit(int rc){
sl@0:   exit(rc);
sl@0: }
sl@0: 
sl@0: extern char *sqlite3_mprintf(const char *zFormat, ...);
sl@0: extern char *sqlite3_vmprintf(const char *zFormat, va_list);
sl@0: 
sl@0: /*
sl@0: ** When a lock occurs, yield.
sl@0: */
sl@0: static int db_is_locked(void *NotUsed, int iCount){
sl@0:   /* sched_yield(); */
sl@0:   if( verbose ) printf("BUSY %s #%d\n", (char*)NotUsed, iCount);
sl@0:   usleep(100);
sl@0:   return iCount<25;
sl@0: }
sl@0: 
sl@0: /*
sl@0: ** Used to accumulate query results by db_query()
sl@0: */
sl@0: struct QueryResult {
sl@0:   const char *zFile;  /* Filename - used for error reporting */
sl@0:   int nElem;          /* Number of used entries in azElem[] */
sl@0:   int nAlloc;         /* Number of slots allocated for azElem[] */
sl@0:   char **azElem;      /* The result of the query */
sl@0: };
sl@0: 
sl@0: /*
sl@0: ** The callback function for db_query
sl@0: */
sl@0: static int db_query_callback(
sl@0:   void *pUser,     /* Pointer to the QueryResult structure */
sl@0:   int nArg,        /* Number of columns in this result row */
sl@0:   char **azArg,    /* Text of data in all columns */
sl@0:   char **NotUsed   /* Names of the columns */
sl@0: ){
sl@0:   struct QueryResult *pResult = (struct QueryResult*)pUser;
sl@0:   int i;
sl@0:   if( pResult->nElem + nArg >= pResult->nAlloc ){
sl@0:     if( pResult->nAlloc==0 ){
sl@0:       pResult->nAlloc = nArg+1;
sl@0:     }else{
sl@0:       pResult->nAlloc = pResult->nAlloc*2 + nArg + 1;
sl@0:     }
sl@0:     pResult->azElem = realloc( pResult->azElem, pResult->nAlloc*sizeof(char*));
sl@0:     if( pResult->azElem==0 ){
sl@0:       fprintf(stdout,"%s: malloc failed\n", pResult->zFile);
sl@0:       return 1;
sl@0:     }
sl@0:   }
sl@0:   if( azArg==0 ) return 0;
sl@0:   for(i=0; i<nArg; i++){
sl@0:     pResult->azElem[pResult->nElem++] =
sl@0:         sqlite3_mprintf("%s",azArg[i] ? azArg[i] : ""); 
sl@0:   }
sl@0:   return 0;
sl@0: }
sl@0: 
sl@0: /*
sl@0: ** Execute a query against the database.  NULL values are returned
sl@0: ** as an empty string.  The list is terminated by a single NULL pointer.
sl@0: */
sl@0: char **db_query(sqlite *db, const char *zFile, const char *zFormat, ...){
sl@0:   char *zSql;
sl@0:   int rc;
sl@0:   char *zErrMsg = 0;
sl@0:   va_list ap;
sl@0:   struct QueryResult sResult;
sl@0:   va_start(ap, zFormat);
sl@0:   zSql = sqlite3_vmprintf(zFormat, ap);
sl@0:   va_end(ap);
sl@0:   memset(&sResult, 0, sizeof(sResult));
sl@0:   sResult.zFile = zFile;
sl@0:   if( verbose ) printf("QUERY %s: %s\n", zFile, zSql);
sl@0:   rc = sqlite3_exec(db, zSql, db_query_callback, &sResult, &zErrMsg);
sl@0:   if( rc==SQLITE_SCHEMA ){
sl@0:     if( zErrMsg ) free(zErrMsg);
sl@0:     rc = sqlite3_exec(db, zSql, db_query_callback, &sResult, &zErrMsg);
sl@0:   }
sl@0:   if( verbose ) printf("DONE %s %s\n", zFile, zSql);
sl@0:   if( zErrMsg ){
sl@0:     fprintf(stdout,"%s: query failed: %s - %s\n", zFile, zSql, zErrMsg);
sl@0:     free(zErrMsg);
sl@0:     free(zSql);
sl@0:     Exit(1);
sl@0:   }
sl@0:   sqlite3_free(zSql);
sl@0:   if( sResult.azElem==0 ){
sl@0:     db_query_callback(&sResult, 0, 0, 0);
sl@0:   }
sl@0:   sResult.azElem[sResult.nElem] = 0;
sl@0:   return sResult.azElem;
sl@0: }
sl@0: 
sl@0: /*
sl@0: ** Execute an SQL statement.
sl@0: */
sl@0: void db_execute(sqlite *db, const char *zFile, const char *zFormat, ...){
sl@0:   char *zSql;
sl@0:   int rc;
sl@0:   char *zErrMsg = 0;
sl@0:   va_list ap;
sl@0:   va_start(ap, zFormat);
sl@0:   zSql = sqlite3_vmprintf(zFormat, ap);
sl@0:   va_end(ap);
sl@0:   if( verbose ) printf("EXEC %s: %s\n", zFile, zSql);
sl@0:   do{
sl@0:     rc = sqlite3_exec(db, zSql, 0, 0, &zErrMsg);
sl@0:   }while( rc==SQLITE_BUSY );
sl@0:   if( verbose ) printf("DONE %s: %s\n", zFile, zSql);
sl@0:   if( zErrMsg ){
sl@0:     fprintf(stdout,"%s: command failed: %s - %s\n", zFile, zSql, zErrMsg);
sl@0:     free(zErrMsg);
sl@0:     sqlite3_free(zSql);
sl@0:     Exit(1);
sl@0:   }
sl@0:   sqlite3_free(zSql);
sl@0: }
sl@0: 
sl@0: /*
sl@0: ** Free the results of a db_query() call.
sl@0: */
sl@0: void db_query_free(char **az){
sl@0:   int i;
sl@0:   for(i=0; az[i]; i++){
sl@0:     sqlite3_free(az[i]);
sl@0:   }
sl@0:   free(az);
sl@0: }
sl@0: 
sl@0: /*
sl@0: ** Check results
sl@0: */
sl@0: void db_check(const char *zFile, const char *zMsg, char **az, ...){
sl@0:   va_list ap;
sl@0:   int i;
sl@0:   char *z;
sl@0:   va_start(ap, az);
sl@0:   for(i=0; (z = va_arg(ap, char*))!=0; i++){
sl@0:     if( az[i]==0 || strcmp(az[i],z)!=0 ){
sl@0:       fprintf(stdout,"%s: %s: bad result in column %d: %s\n",
sl@0:         zFile, zMsg, i+1, az[i]);
sl@0:       db_query_free(az);
sl@0:       Exit(1);
sl@0:     }
sl@0:   }
sl@0:   va_end(ap);
sl@0:   db_query_free(az);
sl@0: }
sl@0: 
sl@0: pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER;
sl@0: pthread_cond_t sig = PTHREAD_COND_INITIALIZER;
sl@0: int thread_cnt = 0;
sl@0: 
sl@0: static void *worker_bee(void *pArg){
sl@0:   const char *zFilename = (char*)pArg;
sl@0:   char *azErr;
sl@0:   int i, cnt;
sl@0:   int t = atoi(zFilename);
sl@0:   char **az;
sl@0:   sqlite *db;
sl@0: 
sl@0:   pthread_mutex_lock(&lock);
sl@0:   thread_cnt++;
sl@0:   pthread_mutex_unlock(&lock);
sl@0:   printf("%s: START\n", zFilename);
sl@0:   fflush(stdout);
sl@0:   for(cnt=0; cnt<10; cnt++){
sl@0:     sqlite3_open(&zFilename[2], &db);
sl@0:     if( db==0 ){
sl@0:       fprintf(stdout,"%s: can't open\n", zFilename);
sl@0:       Exit(1);
sl@0:     }
sl@0:     sqlite3_busy_handler(db, db_is_locked, zFilename);
sl@0:     db_execute(db, zFilename, "CREATE TABLE t%d(a,b,c);", t);
sl@0:     for(i=1; i<=100; i++){
sl@0:       db_execute(db, zFilename, "INSERT INTO t%d VALUES(%d,%d,%d);",
sl@0:          t, i, i*2, i*i);
sl@0:     }
sl@0:     az = db_query(db, zFilename, "SELECT count(*) FROM t%d", t);
sl@0:     db_check(zFilename, "tX size", az, "100", 0);  
sl@0:     az = db_query(db, zFilename, "SELECT avg(b) FROM t%d", t);
sl@0:     db_check(zFilename, "tX avg", az, "101", 0);  
sl@0:     db_execute(db, zFilename, "DELETE FROM t%d WHERE a>50", t);
sl@0:     az = db_query(db, zFilename, "SELECT avg(b) FROM t%d", t);
sl@0:     db_check(zFilename, "tX avg2", az, "51", 0);
sl@0:     for(i=1; i<=50; i++){
sl@0:       char z1[30], z2[30];
sl@0:       az = db_query(db, zFilename, "SELECT b, c FROM t%d WHERE a=%d", t, i);
sl@0:       sprintf(z1, "%d", i*2);
sl@0:       sprintf(z2, "%d", i*i);
sl@0:       db_check(zFilename, "readback", az, z1, z2, 0);
sl@0:     }
sl@0:     db_execute(db, zFilename, "DROP TABLE t%d;", t);
sl@0:     sqlite3_close(db);
sl@0:   }
sl@0:   printf("%s: END\n", zFilename);
sl@0:   /* unlink(zFilename); */
sl@0:   fflush(stdout);
sl@0:   pthread_mutex_lock(&lock);
sl@0:   thread_cnt--;
sl@0:   if( thread_cnt<=0 ){
sl@0:     pthread_cond_signal(&sig);
sl@0:   }
sl@0:   pthread_mutex_unlock(&lock);
sl@0:   return 0;
sl@0: }
sl@0: 
sl@0: int main(int argc, char **argv){
sl@0:   char *zFile;
sl@0:   int i, n;
sl@0:   pthread_t id;
sl@0:   if( argc>2 && strcmp(argv[1], "-v")==0 ){
sl@0:     verbose = 1;
sl@0:     argc--;
sl@0:     argv++;
sl@0:   }
sl@0:   if( argc<2 || (n=atoi(argv[1]))<1 ) n = 10;
sl@0:   for(i=0; i<n; i++){
sl@0:     char zBuf[200];
sl@0:     sprintf(zBuf, "testdb-%d", (i+1)/2);
sl@0:     unlink(zBuf);
sl@0:   }
sl@0:   for(i=0; i<n; i++){
sl@0:     zFile = sqlite3_mprintf("%d.testdb-%d", i%2+1, (i+2)/2);
sl@0:     if( (i%2)==0 ){
sl@0:       /* Remove both the database file and any old journal for the file
sl@0:       ** being used by this thread and the next one. */
sl@0:       char *zDb = &zFile[2];
sl@0:       char *zJournal = sqlite3_mprintf("%s-journal", zDb);
sl@0:       unlink(zDb);
sl@0:       unlink(zJournal);
sl@0:       free(zJournal);
sl@0:     }
sl@0:       
sl@0:     pthread_create(&id, 0, worker_bee, (void*)zFile);
sl@0:     pthread_detach(id);
sl@0:   }
sl@0:   pthread_mutex_lock(&lock);
sl@0:   while( thread_cnt>0 ){
sl@0:     pthread_cond_wait(&sig, &lock);
sl@0:   }
sl@0:   pthread_mutex_unlock(&lock);
sl@0:   for(i=0; i<n; i++){
sl@0:     char zBuf[200];
sl@0:     sprintf(zBuf, "testdb-%d", (i+1)/2);
sl@0:     unlink(zBuf);
sl@0:   }
sl@0:   return 0;
sl@0: }