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726 lines (689 loc) · 19.7 KB
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/*
** 2003 December 18
**
** 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.
**
*************************************************************************
** Code for testing the SQLite library in a multithreaded environment.
*/
#include "sqliteInt.h"
#if defined(INCLUDE_SQLITE_TCL_H)
# include "sqlite_tcl.h"
#else
# include "tcl.h"
#endif
#if SQLITE_OS_UNIX && SQLITE_THREADSAFE
#include <stdlib.h>
#include <string.h>
#include <pthread.h>
#include <sched.h>
#include <ctype.h>
extern const char *sqlite3ErrName(int);
/*
** Each thread is controlled by an instance of the following
** structure.
*/
typedef struct Thread Thread;
struct Thread {
/* The first group of fields are writable by the master and read-only
** to the thread. */
char *zFilename; /* Name of database file */
void (*xOp)(Thread*); /* next operation to do */
char *zArg; /* argument usable by xOp */
int opnum; /* Operation number */
int busy; /* True if this thread is in use */
/* The next group of fields are writable by the thread but read-only to the
** master. */
int completed; /* Number of operations completed */
sqlite3 *db; /* Open database */
sqlite3_stmt *pStmt; /* Pending operation */
char *zErr; /* operation error */
char *zStaticErr; /* Static error message */
int rc; /* operation return code */
int argc; /* number of columns in result */
const char *argv[100]; /* result columns */
const char *colv[100]; /* result column names */
};
/*
** There can be as many as 26 threads running at once. Each is named
** by a capital letter: A, B, C, ..., Y, Z.
*/
#define N_THREAD 26
static Thread threadset[N_THREAD];
/*
** The main loop for a thread. Threads use busy waiting.
*/
static void *test_thread_main(void *pArg){
Thread *p = (Thread*)pArg;
if( p->db ){
sqlite3_close(p->db);
}
sqlite3_open(p->zFilename, &p->db);
if( SQLITE_OK!=sqlite3_errcode(p->db) ){
p->zErr = strdup(sqlite3_errmsg(p->db));
sqlite3_close(p->db);
p->db = 0;
}
p->pStmt = 0;
p->completed = 1;
while( p->opnum<=p->completed ) sched_yield();
while( p->xOp ){
if( p->zErr && p->zErr!=p->zStaticErr ){
sqlite3_free(p->zErr);
p->zErr = 0;
}
(*p->xOp)(p);
p->completed++;
while( p->opnum<=p->completed ) sched_yield();
}
if( p->pStmt ){
sqlite3_finalize(p->pStmt);
p->pStmt = 0;
}
if( p->db ){
sqlite3_close(p->db);
p->db = 0;
}
if( p->zErr && p->zErr!=p->zStaticErr ){
sqlite3_free(p->zErr);
p->zErr = 0;
}
p->completed++;
#ifndef SQLITE_OMIT_DEPRECATED
sqlite3_thread_cleanup();
#endif
return 0;
}
/*
** Get a thread ID which is an upper case letter. Return the index.
** If the argument is not a valid thread ID put an error message in
** the interpreter and return -1.
*/
static int parse_thread_id(Tcl_Interp *interp, const char *zArg){
if( zArg==0 || zArg[0]==0 || zArg[1]!=0 || !isupper((unsigned char)zArg[0]) ){
Tcl_AppendResult(interp, "thread ID must be an upper case letter", 0);
return -1;
}
return zArg[0] - 'A';
}
/*
** Usage: thread_create NAME FILENAME
**
** NAME should be an upper case letter. Start the thread running with
** an open connection to the given database.
*/
static int SQLITE_TCLAPI tcl_thread_create(
void *NotUsed,
Tcl_Interp *interp, /* The TCL interpreter that invoked this command */
int argc, /* Number of arguments */
const char **argv /* Text of each argument */
){
int i;
pthread_t x;
int rc;
if( argc!=3 ){
Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],
" ID FILENAME", 0);
return TCL_ERROR;
}
i = parse_thread_id(interp, argv[1]);
if( i<0 ) return TCL_ERROR;
if( threadset[i].busy ){
Tcl_AppendResult(interp, "thread ", argv[1], " is already running", 0);
return TCL_ERROR;
}
threadset[i].busy = 1;
sqlite3_free(threadset[i].zFilename);
threadset[i].zFilename = sqlite3_mprintf("%s", argv[2]);
threadset[i].opnum = 1;
threadset[i].completed = 0;
rc = pthread_create(&x, 0, test_thread_main, &threadset[i]);
if( rc ){
Tcl_AppendResult(interp, "failed to create the thread", 0);
sqlite3_free(threadset[i].zFilename);
threadset[i].busy = 0;
return TCL_ERROR;
}
pthread_detach(x);
return TCL_OK;
}
/*
** Wait for a thread to reach its idle state.
*/
static void test_thread_wait(Thread *p){
while( p->opnum>p->completed ) sched_yield();
}
/*
** Usage: thread_wait ID
**
** Wait on thread ID to reach its idle state.
*/
static int SQLITE_TCLAPI tcl_thread_wait(
void *NotUsed,
Tcl_Interp *interp, /* The TCL interpreter that invoked this command */
int argc, /* Number of arguments */
const char **argv /* Text of each argument */
){
int i;
if( argc!=2 ){
Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],
" ID", 0);
return TCL_ERROR;
}
i = parse_thread_id(interp, argv[1]);
if( i<0 ) return TCL_ERROR;
if( !threadset[i].busy ){
Tcl_AppendResult(interp, "no such thread", 0);
return TCL_ERROR;
}
test_thread_wait(&threadset[i]);
return TCL_OK;
}
/*
** Stop a thread.
*/
static void test_stop_thread(Thread *p){
test_thread_wait(p);
p->xOp = 0;
p->opnum++;
test_thread_wait(p);
sqlite3_free(p->zArg);
p->zArg = 0;
sqlite3_free(p->zFilename);
p->zFilename = 0;
p->busy = 0;
}
/*
** Usage: thread_halt ID
**
** Cause a thread to shut itself down. Wait for the shutdown to be
** completed. If ID is "*" then stop all threads.
*/
static int SQLITE_TCLAPI tcl_thread_halt(
void *NotUsed,
Tcl_Interp *interp, /* The TCL interpreter that invoked this command */
int argc, /* Number of arguments */
const char **argv /* Text of each argument */
){
int i;
if( argc!=2 ){
Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],
" ID", 0);
return TCL_ERROR;
}
if( argv[1][0]=='*' && argv[1][1]==0 ){
for(i=0; i<N_THREAD; i++){
if( threadset[i].busy ) test_stop_thread(&threadset[i]);
}
}else{
i = parse_thread_id(interp, argv[1]);
if( i<0 ) return TCL_ERROR;
if( !threadset[i].busy ){
Tcl_AppendResult(interp, "no such thread", 0);
return TCL_ERROR;
}
test_stop_thread(&threadset[i]);
}
return TCL_OK;
}
/*
** Usage: thread_argc ID
**
** Wait on the most recent thread_step to complete, then return the
** number of columns in the result set.
*/
static int SQLITE_TCLAPI tcl_thread_argc(
void *NotUsed,
Tcl_Interp *interp, /* The TCL interpreter that invoked this command */
int argc, /* Number of arguments */
const char **argv /* Text of each argument */
){
int i;
char zBuf[100];
if( argc!=2 ){
Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],
" ID", 0);
return TCL_ERROR;
}
i = parse_thread_id(interp, argv[1]);
if( i<0 ) return TCL_ERROR;
if( !threadset[i].busy ){
Tcl_AppendResult(interp, "no such thread", 0);
return TCL_ERROR;
}
test_thread_wait(&threadset[i]);
sqlite3_snprintf(sizeof(zBuf), zBuf, "%d", threadset[i].argc);
Tcl_AppendResult(interp, zBuf, 0);
return TCL_OK;
}
/*
** Usage: thread_argv ID N
**
** Wait on the most recent thread_step to complete, then return the
** value of the N-th columns in the result set.
*/
static int SQLITE_TCLAPI tcl_thread_argv(
void *NotUsed,
Tcl_Interp *interp, /* The TCL interpreter that invoked this command */
int argc, /* Number of arguments */
const char **argv /* Text of each argument */
){
int i;
int n;
if( argc!=3 ){
Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],
" ID N", 0);
return TCL_ERROR;
}
i = parse_thread_id(interp, argv[1]);
if( i<0 ) return TCL_ERROR;
if( !threadset[i].busy ){
Tcl_AppendResult(interp, "no such thread", 0);
return TCL_ERROR;
}
if( Tcl_GetInt(interp, argv[2], &n) ) return TCL_ERROR;
test_thread_wait(&threadset[i]);
if( n<0 || n>=threadset[i].argc ){
Tcl_AppendResult(interp, "column number out of range", 0);
return TCL_ERROR;
}
Tcl_AppendResult(interp, threadset[i].argv[n], 0);
return TCL_OK;
}
/*
** Usage: thread_colname ID N
**
** Wait on the most recent thread_step to complete, then return the
** name of the N-th columns in the result set.
*/
static int SQLITE_TCLAPI tcl_thread_colname(
void *NotUsed,
Tcl_Interp *interp, /* The TCL interpreter that invoked this command */
int argc, /* Number of arguments */
const char **argv /* Text of each argument */
){
int i;
int n;
if( argc!=3 ){
Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],
" ID N", 0);
return TCL_ERROR;
}
i = parse_thread_id(interp, argv[1]);
if( i<0 ) return TCL_ERROR;
if( !threadset[i].busy ){
Tcl_AppendResult(interp, "no such thread", 0);
return TCL_ERROR;
}
if( Tcl_GetInt(interp, argv[2], &n) ) return TCL_ERROR;
test_thread_wait(&threadset[i]);
if( n<0 || n>=threadset[i].argc ){
Tcl_AppendResult(interp, "column number out of range", 0);
return TCL_ERROR;
}
Tcl_AppendResult(interp, threadset[i].colv[n], 0);
return TCL_OK;
}
/*
** Usage: thread_result ID
**
** Wait on the most recent operation to complete, then return the
** result code from that operation.
*/
static int SQLITE_TCLAPI tcl_thread_result(
void *NotUsed,
Tcl_Interp *interp, /* The TCL interpreter that invoked this command */
int argc, /* Number of arguments */
const char **argv /* Text of each argument */
){
int i;
const char *zName;
if( argc!=2 ){
Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],
" ID", 0);
return TCL_ERROR;
}
i = parse_thread_id(interp, argv[1]);
if( i<0 ) return TCL_ERROR;
if( !threadset[i].busy ){
Tcl_AppendResult(interp, "no such thread", 0);
return TCL_ERROR;
}
test_thread_wait(&threadset[i]);
zName = sqlite3ErrName(threadset[i].rc);
Tcl_AppendResult(interp, zName, 0);
return TCL_OK;
}
/*
** Usage: thread_error ID
**
** Wait on the most recent operation to complete, then return the
** error string.
*/
static int SQLITE_TCLAPI tcl_thread_error(
void *NotUsed,
Tcl_Interp *interp, /* The TCL interpreter that invoked this command */
int argc, /* Number of arguments */
const char **argv /* Text of each argument */
){
int i;
if( argc!=2 ){
Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],
" ID", 0);
return TCL_ERROR;
}
i = parse_thread_id(interp, argv[1]);
if( i<0 ) return TCL_ERROR;
if( !threadset[i].busy ){
Tcl_AppendResult(interp, "no such thread", 0);
return TCL_ERROR;
}
test_thread_wait(&threadset[i]);
Tcl_AppendResult(interp, threadset[i].zErr, 0);
return TCL_OK;
}
/*
** This procedure runs in the thread to compile an SQL statement.
*/
static void do_compile(Thread *p){
if( p->db==0 ){
p->zErr = p->zStaticErr = "no database is open";
p->rc = SQLITE_ERROR;
return;
}
if( p->pStmt ){
sqlite3_finalize(p->pStmt);
p->pStmt = 0;
}
p->rc = sqlite3_prepare(p->db, p->zArg, -1, &p->pStmt, 0);
}
/*
** Usage: thread_compile ID SQL
**
** Compile a new virtual machine.
*/
static int SQLITE_TCLAPI tcl_thread_compile(
void *NotUsed,
Tcl_Interp *interp, /* The TCL interpreter that invoked this command */
int argc, /* Number of arguments */
const char **argv /* Text of each argument */
){
int i;
if( argc!=3 ){
Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],
" ID SQL", 0);
return TCL_ERROR;
}
i = parse_thread_id(interp, argv[1]);
if( i<0 ) return TCL_ERROR;
if( !threadset[i].busy ){
Tcl_AppendResult(interp, "no such thread", 0);
return TCL_ERROR;
}
test_thread_wait(&threadset[i]);
threadset[i].xOp = do_compile;
sqlite3_free(threadset[i].zArg);
threadset[i].zArg = sqlite3_mprintf("%s", argv[2]);
threadset[i].opnum++;
return TCL_OK;
}
/*
** This procedure runs in the thread to step the virtual machine.
*/
static void do_step(Thread *p){
int i;
if( p->pStmt==0 ){
p->zErr = p->zStaticErr = "no virtual machine available";
p->rc = SQLITE_ERROR;
return;
}
p->rc = sqlite3_step(p->pStmt);
if( p->rc==SQLITE_ROW ){
p->argc = sqlite3_column_count(p->pStmt);
for(i=0; i<sqlite3_data_count(p->pStmt); i++){
p->argv[i] = (char*)sqlite3_column_text(p->pStmt, i);
}
for(i=0; i<p->argc; i++){
p->colv[i] = sqlite3_column_name(p->pStmt, i);
}
}
}
/*
** Usage: thread_step ID
**
** Advance the virtual machine by one step
*/
static int SQLITE_TCLAPI tcl_thread_step(
void *NotUsed,
Tcl_Interp *interp, /* The TCL interpreter that invoked this command */
int argc, /* Number of arguments */
const char **argv /* Text of each argument */
){
int i;
if( argc!=2 ){
Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],
" IDL", 0);
return TCL_ERROR;
}
i = parse_thread_id(interp, argv[1]);
if( i<0 ) return TCL_ERROR;
if( !threadset[i].busy ){
Tcl_AppendResult(interp, "no such thread", 0);
return TCL_ERROR;
}
test_thread_wait(&threadset[i]);
threadset[i].xOp = do_step;
threadset[i].opnum++;
return TCL_OK;
}
/*
** This procedure runs in the thread to finalize a virtual machine.
*/
static void do_finalize(Thread *p){
if( p->pStmt==0 ){
p->zErr = p->zStaticErr = "no virtual machine available";
p->rc = SQLITE_ERROR;
return;
}
p->rc = sqlite3_finalize(p->pStmt);
p->pStmt = 0;
}
/*
** Usage: thread_finalize ID
**
** Finalize the virtual machine.
*/
static int SQLITE_TCLAPI tcl_thread_finalize(
void *NotUsed,
Tcl_Interp *interp, /* The TCL interpreter that invoked this command */
int argc, /* Number of arguments */
const char **argv /* Text of each argument */
){
int i;
if( argc!=2 ){
Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],
" IDL", 0);
return TCL_ERROR;
}
i = parse_thread_id(interp, argv[1]);
if( i<0 ) return TCL_ERROR;
if( !threadset[i].busy ){
Tcl_AppendResult(interp, "no such thread", 0);
return TCL_ERROR;
}
test_thread_wait(&threadset[i]);
threadset[i].xOp = do_finalize;
sqlite3_free(threadset[i].zArg);
threadset[i].zArg = 0;
threadset[i].opnum++;
return TCL_OK;
}
/*
** Usage: thread_swap ID ID
**
** Interchange the sqlite* pointer between two threads.
*/
static int SQLITE_TCLAPI tcl_thread_swap(
void *NotUsed,
Tcl_Interp *interp, /* The TCL interpreter that invoked this command */
int argc, /* Number of arguments */
const char **argv /* Text of each argument */
){
int i, j;
sqlite3 *temp;
if( argc!=3 ){
Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],
" ID1 ID2", 0);
return TCL_ERROR;
}
i = parse_thread_id(interp, argv[1]);
if( i<0 ) return TCL_ERROR;
if( !threadset[i].busy ){
Tcl_AppendResult(interp, "no such thread", 0);
return TCL_ERROR;
}
test_thread_wait(&threadset[i]);
j = parse_thread_id(interp, argv[2]);
if( j<0 ) return TCL_ERROR;
if( !threadset[j].busy ){
Tcl_AppendResult(interp, "no such thread", 0);
return TCL_ERROR;
}
test_thread_wait(&threadset[j]);
temp = threadset[i].db;
threadset[i].db = threadset[j].db;
threadset[j].db = temp;
return TCL_OK;
}
/*
** Usage: thread_db_get ID
**
** Return the database connection pointer for the given thread. Then
** remove the pointer from the thread itself. Afterwards, the thread
** can be stopped and the connection can be used by the main thread.
*/
static int SQLITE_TCLAPI tcl_thread_db_get(
void *NotUsed,
Tcl_Interp *interp, /* The TCL interpreter that invoked this command */
int argc, /* Number of arguments */
const char **argv /* Text of each argument */
){
int i;
char zBuf[100];
extern int sqlite3TestMakePointerStr(Tcl_Interp*, char*, void*);
if( argc!=2 ){
Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],
" ID", 0);
return TCL_ERROR;
}
i = parse_thread_id(interp, argv[1]);
if( i<0 ) return TCL_ERROR;
if( !threadset[i].busy ){
Tcl_AppendResult(interp, "no such thread", 0);
return TCL_ERROR;
}
test_thread_wait(&threadset[i]);
sqlite3TestMakePointerStr(interp, zBuf, threadset[i].db);
threadset[i].db = 0;
Tcl_AppendResult(interp, zBuf, (char*)0);
return TCL_OK;
}
/*
** Usage: thread_db_put ID DB
**
*/
static int SQLITE_TCLAPI tcl_thread_db_put(
void *NotUsed,
Tcl_Interp *interp, /* The TCL interpreter that invoked this command */
int argc, /* Number of arguments */
const char **argv /* Text of each argument */
){
int i;
extern int sqlite3TestMakePointerStr(Tcl_Interp*, char*, void*);
extern void *sqlite3TestTextToPtr(const char *);
if( argc!=3 ){
Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],
" ID DB", 0);
return TCL_ERROR;
}
i = parse_thread_id(interp, argv[1]);
if( i<0 ) return TCL_ERROR;
if( !threadset[i].busy ){
Tcl_AppendResult(interp, "no such thread", 0);
return TCL_ERROR;
}
test_thread_wait(&threadset[i]);
assert( !threadset[i].db );
threadset[i].db = (sqlite3*)sqlite3TestTextToPtr(argv[2]);
return TCL_OK;
}
/*
** Usage: thread_stmt_get ID
**
** Return the database stmt pointer for the given thread. Then
** remove the pointer from the thread itself.
*/
static int SQLITE_TCLAPI tcl_thread_stmt_get(
void *NotUsed,
Tcl_Interp *interp, /* The TCL interpreter that invoked this command */
int argc, /* Number of arguments */
const char **argv /* Text of each argument */
){
int i;
char zBuf[100];
extern int sqlite3TestMakePointerStr(Tcl_Interp*, char*, void*);
if( argc!=2 ){
Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],
" ID", 0);
return TCL_ERROR;
}
i = parse_thread_id(interp, argv[1]);
if( i<0 ) return TCL_ERROR;
if( !threadset[i].busy ){
Tcl_AppendResult(interp, "no such thread", 0);
return TCL_ERROR;
}
test_thread_wait(&threadset[i]);
sqlite3TestMakePointerStr(interp, zBuf, threadset[i].pStmt);
threadset[i].pStmt = 0;
Tcl_AppendResult(interp, zBuf, (char*)0);
return TCL_OK;
}
/*
** Register commands with the TCL interpreter.
*/
int Sqlitetest4_Init(Tcl_Interp *interp){
static struct {
char *zName;
Tcl_CmdProc *xProc;
} aCmd[] = {
{ "thread_create", (Tcl_CmdProc*)tcl_thread_create },
{ "thread_wait", (Tcl_CmdProc*)tcl_thread_wait },
{ "thread_halt", (Tcl_CmdProc*)tcl_thread_halt },
{ "thread_argc", (Tcl_CmdProc*)tcl_thread_argc },
{ "thread_argv", (Tcl_CmdProc*)tcl_thread_argv },
{ "thread_colname", (Tcl_CmdProc*)tcl_thread_colname },
{ "thread_result", (Tcl_CmdProc*)tcl_thread_result },
{ "thread_error", (Tcl_CmdProc*)tcl_thread_error },
{ "thread_compile", (Tcl_CmdProc*)tcl_thread_compile },
{ "thread_step", (Tcl_CmdProc*)tcl_thread_step },
{ "thread_finalize", (Tcl_CmdProc*)tcl_thread_finalize },
{ "thread_swap", (Tcl_CmdProc*)tcl_thread_swap },
{ "thread_db_get", (Tcl_CmdProc*)tcl_thread_db_get },
{ "thread_db_put", (Tcl_CmdProc*)tcl_thread_db_put },
{ "thread_stmt_get", (Tcl_CmdProc*)tcl_thread_stmt_get },
};
int i;
for(i=0; i<sizeof(aCmd)/sizeof(aCmd[0]); i++){
Tcl_CreateCommand(interp, aCmd[i].zName, aCmd[i].xProc, 0, 0);
}
return TCL_OK;
}
#else
int Sqlitetest4_Init(Tcl_Interp *interp){ return TCL_OK; }
#endif /* SQLITE_OS_UNIX */