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sqlite/test/threadtest4.c
drh 9bd3cc4681 Add extra tests to threadtest4.c. Fix a benign data race accessing the 
text encoding using ENC(db).

FossilOrigin-Name: d7bb7ea4ab97ad26f4c84c9b8dc2827010093803
2014-12-12 23:17:54 +00:00

485 lines
14 KiB
C
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/*
** 2014-12-11
**
** 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 stress the
** SQLite library when accessing the same set of databases simultaneously
** from multiple threads in shared-cache mode.
**
** This test program runs on unix-like systems only. It uses pthreads.
** To compile:
**
** gcc -g -Wall -I. threadtest4.c sqlite3.c -ldl -lpthread
**
** To run:
**
** ./a.out 10
**
** The argument is the number of threads. There are also options, such
** as -wal and -multithread and -serialized.
**
** Consider also compiling with clang instead of gcc and adding the
** -fsanitize=thread option.
*/
#include "sqlite3.h"
#include <pthread.h>
#include <sched.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <stdarg.h>
/*
** An instance of the following structure is passed into each worker
** thread.
*/
typedef struct WorkerInfo WorkerInfo;
struct WorkerInfo {
int tid; /* Thread ID */
int nWorker; /* Total number of workers */
unsigned wkrFlags; /* Flags */
sqlite3 *mainDb; /* Database connection of the main thread */
sqlite3 *db; /* Database connection of this thread */
int nErr; /* Number of errors seen by this thread */
int nTest; /* Number of tests run by this thread */
char *zMsg; /* Message returned by this thread */
pthread_t id; /* Thread id */
pthread_mutex_t *pWrMutex; /* Hold this mutex while writing */
};
/*
** Allowed values for WorkerInfo.wkrFlags
*/
#define TT4_SERIALIZED 0x0000001 /* The --serialized option is used */
#define TT4_WAL 0x0000002 /* WAL mode in use */
#define TT4_TRACE 0x0000004 /* Trace activity */
/*
** Report an OOM error and die if the argument is NULL
*/
static void check_oom(void *x){
if( x==0 ){
fprintf(stderr, "out of memory\n");
exit(1);
}
}
/*
** Allocate memory. If the allocation fails, print an error message and
** kill the process.
*/
static void *safe_malloc(int sz){
void *x = sqlite3_malloc(sz>0?sz:1);
check_oom(x);
return x;
}
/*
** Print a trace message for a worker
*/
static void worker_trace(WorkerInfo *p, const char *zFormat, ...){
va_list ap;
char *zMsg;
if( (p->wkrFlags & TT4_TRACE)==0 ) return;
va_start(ap, zFormat);
zMsg = sqlite3_vmprintf(zFormat, ap);
check_oom(zMsg);
va_end(ap);
fprintf(stderr, "TRACE(%02d): %s\n", p->tid, zMsg);
sqlite3_free(zMsg);
}
/*
** Prepare a single SQL query
*/
static sqlite3_stmt *prep_sql(sqlite3 *db, const char *zFormat, ...){
va_list ap;
char *zSql;
int rc;
sqlite3_stmt *pStmt = 0;
va_start(ap, zFormat);
zSql = sqlite3_vmprintf(zFormat, ap);
va_end(ap);
check_oom(zSql);
rc = sqlite3_prepare_v2(db, zSql, -1, &pStmt, 0);
if( rc!=SQLITE_OK ){
fprintf(stderr, "SQL error (%d,%d): %s\nWhile preparing: [%s]\n",
rc, sqlite3_extended_errcode(db), sqlite3_errmsg(db), zSql);
exit(1);
}
sqlite3_free(zSql);
return pStmt;
}
/*
** Run a SQL statements. Panic if unable.
*/
static void run_sql(WorkerInfo *p, const char *zFormat, ...){
va_list ap;
char *zSql;
int rc;
sqlite3_stmt *pStmt = 0;
int nRetry = 0;
va_start(ap, zFormat);
zSql = sqlite3_vmprintf(zFormat, ap);
va_end(ap);
check_oom(zSql);
rc = sqlite3_prepare_v2(p->db, zSql, -1, &pStmt, 0);
if( rc!=SQLITE_OK ){
fprintf(stderr, "SQL error (%d,%d): %s\nWhile preparing: [%s]\n",
rc, sqlite3_extended_errcode(p->db), sqlite3_errmsg(p->db), zSql);
exit(1);
}
worker_trace(p, "running [%s]", zSql);
while( (rc = sqlite3_step(pStmt))!=SQLITE_DONE ){
if( (rc&0xff)==SQLITE_BUSY || (rc&0xff)==SQLITE_LOCKED ){
sqlite3_reset(pStmt);
nRetry++;
if( nRetry<10 ){
worker_trace(p, "retry %d for [%s]", nRetry, zSql);
sched_yield();
continue;
}else{
fprintf(stderr, "Deadlock in thread %d while running [%s]\n",
p->tid, zSql);
exit(1);
}
}
if( rc!=SQLITE_ROW ){
fprintf(stderr, "SQL error (%d,%d): %s\nWhile running [%s]\n",
rc, sqlite3_extended_errcode(p->db), sqlite3_errmsg(p->db), zSql);
exit(1);
}
}
sqlite3_free(zSql);
sqlite3_finalize(pStmt);
}
/*
** Open the database connection for WorkerInfo. The order in which
** the files are opened is a function of the tid value.
*/
static void worker_open_connection(WorkerInfo *p, int iCnt){
char *zFile;
int x;
int rc;
static const unsigned char aOrder[6][3] = {
{ 1, 2, 3},
{ 1, 3, 2},
{ 2, 1, 3},
{ 2, 3, 1},
{ 3, 1, 2},
{ 3, 2, 1}
};
x = (p->tid + iCnt) % 6;
zFile = sqlite3_mprintf("tt4-test%d.db", aOrder[x][0]);
check_oom(zFile);
worker_trace(p, "open %s", zFile);
rc = sqlite3_open_v2(zFile, &p->db,
SQLITE_OPEN_READWRITE|SQLITE_OPEN_SHAREDCACHE, 0);
if( rc!=SQLITE_OK ){
fprintf(stderr, "sqlite_open_v2(%s) failed on thread %d\n",
zFile, p->tid);
exit(1);
}
sqlite3_free(zFile);
run_sql(p, "PRAGMA read_uncommitted=ON;");
sqlite3_busy_timeout(p->db, 10000);
run_sql(p, "PRAGMA synchronous=OFF;");
run_sql(p, "ATTACH 'tt4-test%d.db' AS aux1", aOrder[x][1]);
run_sql(p, "ATTACH 'tt4-test%d.db' AS aux2", aOrder[x][2]);
}
/*
** Close the worker database connection
*/
static void worker_close_connection(WorkerInfo *p){
if( p->db ){
worker_trace(p, "close");
sqlite3_close(p->db);
p->db = 0;
}
}
/*
** Delete all content in the three databases associated with a
** single thread. Make this happen all in a single transaction if
** inTrans is true, or separately for each database if inTrans is
** false.
*/
static void worker_delete_all_content(WorkerInfo *p, int inTrans){
if( inTrans ){
pthread_mutex_lock(p->pWrMutex);
run_sql(p, "BEGIN");
run_sql(p, "DELETE FROM t1 WHERE tid=%d", p->tid);
run_sql(p, "DELETE FROM t2 WHERE tid=%d", p->tid);
run_sql(p, "DELETE FROM t3 WHERE tid=%d", p->tid);
run_sql(p, "COMMIT");
pthread_mutex_unlock(p->pWrMutex);
p->nTest++;
}else{
pthread_mutex_lock(p->pWrMutex);
run_sql(p, "DELETE FROM t1 WHERE tid=%d", p->tid);
pthread_mutex_unlock(p->pWrMutex);
p->nTest++;
pthread_mutex_lock(p->pWrMutex);
run_sql(p, "DELETE FROM t2 WHERE tid=%d", p->tid);
pthread_mutex_unlock(p->pWrMutex);
p->nTest++;
pthread_mutex_lock(p->pWrMutex);
run_sql(p, "DELETE FROM t3 WHERE tid=%d", p->tid);
pthread_mutex_unlock(p->pWrMutex);
p->nTest++;
}
}
/*
** Create rows mn through mx in table iTab for the given worker
*/
static void worker_add_content(WorkerInfo *p, int mn, int mx, int iTab){
char *zTabDef;
switch( iTab ){
case 1: zTabDef = "t1(tid,sp,a,b,c)"; break;
case 2: zTabDef = "t2(tid,sp,d,e,f)"; break;
case 3: zTabDef = "t3(tid,sp,x,y,z)"; break;
}
pthread_mutex_lock(p->pWrMutex);
run_sql(p,
"WITH RECURSIVE\n"
" c(i) AS (VALUES(%d) UNION ALL SELECT i+1 FROM c WHERE i<%d)\n"
"INSERT INTO %s SELECT %d, zeroblob(3000), i, printf('%%d',i), i FROM c;",
mn, mx, zTabDef, p->tid
);
pthread_mutex_unlock(p->pWrMutex);
p->nTest++;
}
/*
** Set an error message on a worker
*/
static void worker_error(WorkerInfo *p, const char *zFormat, ...){
va_list ap;
p->nErr++;
sqlite3_free(p->zMsg);
va_start(ap, zFormat);
p->zMsg = sqlite3_vmprintf(zFormat, ap);
va_end(ap);
}
/*
** Each thread runs the following function.
*/
static void *worker_thread(void *pArg){
WorkerInfo *p = (WorkerInfo*)pArg;
int iOuter;
int i;
int rc;
sqlite3_stmt *pStmt;
printf("worker %d startup\n", p->tid); fflush(stdout);
for(iOuter=1; iOuter<=p->nWorker; iOuter++){
worker_open_connection(p, iOuter);
for(i=0; i<4; i++){
worker_add_content(p, i*100+1, (i+1)*100, (p->tid+iOuter)%3 + 1);
worker_add_content(p, i*100+1, (i+1)*100, (p->tid+iOuter+1)%3 + 1);
worker_add_content(p, i*100+1, (i+1)*100, (p->tid+iOuter+2)%3 + 1);
}
pStmt = prep_sql(p->db, "SELECT count(a) FROM t1 WHERE tid=%d", p->tid);
worker_trace(p, "query [%s]", sqlite3_sql(pStmt));
rc = sqlite3_step(pStmt);
if( rc!=SQLITE_ROW ){
worker_error(p, "Failed to step: %s", sqlite3_sql(pStmt));
}else if( sqlite3_column_int(pStmt, 0)!=400 ){
worker_error(p, "Wrong result: %d", sqlite3_column_int(pStmt,0));
}
sqlite3_finalize(pStmt);
if( p->nErr ) break;
if( ((iOuter+p->tid)%3)==0 ){
sqlite3_db_release_memory(p->db);
p->nTest++;
}
pthread_mutex_lock(p->pWrMutex);
run_sql(p, "BEGIN;");
run_sql(p, "UPDATE t1 SET c=NULL WHERE a=55");
run_sql(p, "UPDATE t2 SET f=NULL WHERE d=42");
run_sql(p, "UPDATE t3 SET z=NULL WHERE x=31");
run_sql(p, "ROLLBACK;");
p->nTest++;
pthread_mutex_unlock(p->pWrMutex);
if( iOuter==p->tid ){
pthread_mutex_lock(p->pWrMutex);
run_sql(p, "VACUUM");
pthread_mutex_unlock(p->pWrMutex);
}
pStmt = prep_sql(p->db,
"SELECT t1.rowid, t2.rowid, t3.rowid"
" FROM t1, t2, t3"
" WHERE t1.tid=%d AND t2.tid=%d AND t3.tid=%d"
" AND t1.a<>t2.d AND t2.d<>t3.x"
" ORDER BY 1, 2, 3"
,p->tid, p->tid, p->tid);
worker_trace(p, "query [%s]", sqlite3_sql(pStmt));
for(i=0; i<p->nWorker; i++){
rc = sqlite3_step(pStmt);
if( rc!=SQLITE_ROW ){
worker_error(p, "Failed to step: %s", sqlite3_sql(pStmt));
break;
}
sched_yield();
}
sqlite3_finalize(pStmt);
if( p->nErr ) break;
worker_delete_all_content(p, (p->tid+iOuter)%2);
worker_close_connection(p);
p->db = 0;
}
worker_close_connection(p);
printf("worker %d finished\n", p->tid); fflush(stdout);
return 0;
}
int main(int argc, char **argv){
int nWorker = 0; /* Number of worker threads */
int i; /* Loop counter */
WorkerInfo *aInfo; /* Information for each worker */
unsigned wkrFlags = 0; /* Default worker flags */
int nErr = 0; /* Number of errors */
int nTest = 0; /* Number of tests */
int rc; /* Return code */
sqlite3 *db = 0; /* Main database connection */
pthread_mutex_t wrMutex; /* The write serialization mutex */
WorkerInfo infoTop; /* WorkerInfo for the main thread */
WorkerInfo *p; /* Pointer to infoTop */
sqlite3_config(SQLITE_CONFIG_MULTITHREAD);
for(i=1; i<argc; i++){
const char *z = argv[i];
if( z[0]=='-' ){
if( z[1]=='-' && z[2]!=0 ) z++;
if( strcmp(z,"-multithread")==0 ){
sqlite3_config(SQLITE_CONFIG_MULTITHREAD);
wkrFlags &= ~TT4_SERIALIZED;
}else if( strcmp(z,"-serialized")==0 ){
sqlite3_config(SQLITE_CONFIG_SERIALIZED);
wkrFlags |= TT4_SERIALIZED;
}else if( strcmp(z,"-wal")==0 ){
wkrFlags |= TT4_WAL;
}else if( strcmp(z,"-trace")==0 ){
wkrFlags |= TT4_TRACE;
}else{
fprintf(stderr, "unknown command-line option: %s\n", argv[i]);
exit(1);
}
}else if( z[0]>='1' && z[0]<='9' && nWorker==0 ){
nWorker = atoi(z);
if( nWorker<2 ){
fprintf(stderr, "minimum of 2 threads\n");
exit(1);
}
}else{
fprintf(stderr, "extra command-line argument: \"%s\"\n", argv[i]);
exit(1);
}
}
if( nWorker==0 ){
fprintf(stderr,
"usage: %s ?OPTIONS? N\n"
"N is the number of threads and must be at least 2.\n"
"Options:\n"
" --serialized\n"
" --multithread\n"
" --wal\n"
" --trace\n"
,argv[0]
);
exit(1);
}
if( !sqlite3_threadsafe() ){
fprintf(stderr, "requires a threadsafe build of SQLite\n");
exit(1);
}
sqlite3_initialize();
sqlite3_enable_shared_cache(1);
pthread_mutex_init(&wrMutex, 0);
/* Initialize the test database files */
(void)unlink("tt4-test1.db");
(void)unlink("tt4-test2.db");
(void)unlink("tt4-test3.db");
rc = sqlite3_open("tt4-test1.db", &db);
if( rc!=SQLITE_OK ){
fprintf(stderr, "Unable to open test database: tt4-test2.db\n");
exit(1);
}
memset(&infoTop, 0, sizeof(infoTop));
infoTop.db = db;
infoTop.wkrFlags = wkrFlags;
p = &infoTop;
if( wkrFlags & TT4_WAL ){
run_sql(p, "PRAGMA journal_mode=WAL");
}
run_sql(p, "PRAGMA synchronous=OFF");
run_sql(p, "CREATE TABLE IF NOT EXISTS t1(tid INTEGER, sp, a, b, c)");
run_sql(p, "CREATE INDEX t1tid ON t1(tid)");
run_sql(p, "CREATE INDEX t1ab ON t1(a,b)");
run_sql(p, "ATTACH 'tt4-test2.db' AS 'test2'");
run_sql(p, "CREATE TABLE IF NOT EXISTS test2.t2(tid INTEGER, sp, d, e, f)");
run_sql(p, "CREATE INDEX test2.t2tid ON t2(tid)");
run_sql(p, "CREATE INDEX test2.t2de ON t2(d,e)");
run_sql(p, "ATTACH 'tt4-test3.db' AS 'test3'");
run_sql(p, "CREATE TABLE IF NOT EXISTS test3.t3(tid INTEGER, sp, x, y, z)");
run_sql(p, "CREATE INDEX test3.t3tid ON t3(tid)");
run_sql(p, "CREATE INDEX test3.t3xy ON t3(x,y)");
aInfo = safe_malloc( sizeof(*aInfo)*nWorker );
memset(aInfo, 0, sizeof(*aInfo)*nWorker);
for(i=0; i<nWorker; i++){
aInfo[i].tid = i+1;
aInfo[i].nWorker = nWorker;
aInfo[i].wkrFlags = wkrFlags;
aInfo[i].mainDb = db;
aInfo[i].pWrMutex = &wrMutex;
rc = pthread_create(&aInfo[i].id, 0, worker_thread, &aInfo[i]);
if( rc!=0 ){
fprintf(stderr, "thread creation failed for thread %d\n", i+1);
exit(1);
}
sched_yield();
}
for(i=0; i<nWorker; i++){
pthread_join(aInfo[i].id, 0);
printf("Joined thread %d: %d errors in %d tests",
aInfo[i].tid, aInfo[i].nErr, aInfo[i].nTest);
if( aInfo[i].zMsg ){
printf(": %s\n", aInfo[i].zMsg);
}else{
printf("\n");
}
nErr += aInfo[i].nErr;
nTest += aInfo[i].nTest;
fflush(stdout);
}
sqlite3_close(db);
sqlite3_free(aInfo);
printf("Total %d errors in %d tests\n", nErr, nTest);
return nErr;
}
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