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