Multiples connections is locking

Hi Frediano, I need your help, please!
I built an application using unixODBC with FreeTDS (SQLServer 2000). And I
found a critical problem when I use multiple connections!
I built a Stored Procedure in my BD that stays in slow loop, and I built an
other Stored Procedure that returns very quickly.
I created a thread (posix) to execute the first procedure, and I created an
other thread to execute the second procedure (that returns fast).
I am not sharing any handles between the threads (Enviroment, Connection or
Statement) and I am not using mutex control, but the second thread locks
when try to use any handle (Enviroment by example).
First I created thread that executes slow procedure, and after 1 second, I
create thread that executes fast procedure. But the second procedure only
returns after the first ends.
I built same example in ODBC32 and works well!
Please help me!
I am migrating from windows to linux, and I am needing this very much! Any
help are welcome!
Sorry by my english...

See the functions of the threads:

//---------------------------------------------------
//Thread 1
//--------------------------------------------------
void * conecta1(void *threadid)
{
 SQLHANDLE sqlenvhandle;
    SQLHANDLE sqlconnectionhandle;
    SQLHANDLE sqlstatementhandle;
    SQLRETURN retcode;
    if(SQL_SUCCESS!=SQLAllocHandle(SQL_HANDLE_ENV, SQL_NULL_HANDLE,
&sqlenvhandle))
        goto FINISHED;

    if(SQL_SUCCESS!=SQLSetEnvAttr(sqlenvhandle,SQL_ATTR_ODBC_VERSION,
(SQLPOINTER)SQL_OV_ODBC3, 0))
        goto FINISHED;

    if(SQL_SUCCESS!=SQLAllocHandle(SQL_HANDLE_DBC, sqlenvhandle,
&sqlconnectionhandle))
        goto FINISHED;
    SQLCHAR retconstring[1024];
    switch(SQLDriverConnect (sqlconnectionhandle,
                NULL,
                (SQLCHAR*)"DSN=SPCB140;UID=sa;PWD=senha;",
                SQL_NTS,
                retconstring,
                1024,
                NULL,
                SQL_DRIVER_NOPROMPT)){
        case SQL_SUCCESS_WITH_INFO:
            //show_error(SQL_HANDLE_DBC, sqlconnectionhandle);
            break;
        case SQL_INVALID_HANDLE:
        case SQL_ERROR:
            show_error(SQL_HANDLE_DBC, sqlconnectionhandle);
            goto FINISHED;
        default:
            break;
    }

    if(SQL_SUCCESS!=SQLAllocHandle(SQL_HANDLE_STMT, sqlconnectionhandle,
&sqlstatementhandle))
        goto FINISHED;
    cout << "Executando stp_CON_Teste" << endl;
 if(SQL_SUCCESS!=SQLExecDirect(sqlstatementhandle, (SQLCHAR*)"Exec
INFO.dbo.stp_CON_Teste", SQL_NTS)){
        show_error(SQL_HANDLE_STMT, sqlstatementhandle);
        goto FINISHED;
    }
    else{
        char name[64];
        while(SQLFetch(sqlstatementhandle)==SQL_SUCCESS){
            SQLGetData(sqlstatementhandle, 1, SQL_C_CHAR, name, 64, NULL);
            cout << name << endl;
        }
    }
FINISHED:
    SQLFreeHandle(SQL_HANDLE_STMT, sqlstatementhandle );
    SQLDisconnect(sqlconnectionhandle);
    SQLFreeHandle(SQL_HANDLE_DBC, sqlconnectionhandle);
    SQLFreeHandle(SQL_HANDLE_ENV, sqlenvhandle);
    //pthread_exit(NULL);
}

//---------------------------------------------------
//Thread 2
//--------------------------------------------------
void * conecta2(void *threadid)
{
 SQLHANDLE sqlenvhandle;
    SQLHANDLE sqlconnectionhandle;
    SQLHANDLE sqlstatementhandle;
    SQLRETURN retcode;
    if(SQL_SUCCESS!=SQLAllocHandle(SQL_HANDLE_ENV, SQL_NULL_HANDLE,
&sqlenvhandle))
        goto FINISHED;

    if(SQL_SUCCESS!=SQLSetEnvAttr(sqlenvhandle,SQL_ATTR_ODBC_VERSION,
(SQLPOINTER)SQL_OV_ODBC3, 0))
     goto FINISHED;

    if(SQL_SUCCESS!=SQLAllocHandle(SQL_HANDLE_DBC, sqlenvhandle,
&sqlconnectionhandle))
        goto FINISHED;
    SQLCHAR retconstring[1024];
    switch(SQLDriverConnect (sqlconnectionhandle,
                NULL,
                (SQLCHAR*)"DSN=SPCB140;UID=sa;PWD=senha;",
                SQL_NTS,
                retconstring,
                1024,
                NULL,
                SQL_DRIVER_NOPROMPT)){
        case SQL_SUCCESS_WITH_INFO:
            //show_error(SQL_HANDLE_DBC, sqlconnectionhandle);
            break;
        case SQL_INVALID_HANDLE:
        case SQL_ERROR:
            show_error(SQL_HANDLE_DBC, sqlconnectionhandle);
            goto FINISHED;
        default:
            break;
    }

    if(SQL_SUCCESS!=SQLAllocHandle(SQL_HANDLE_STMT, sqlconnectionhandle,
&sqlstatementhandle))
        goto FINISHED;

 cout << "Executando stp_CON_Teste2" << endl;
 if(SQL_SUCCESS!=SQLExecDirect(sqlstatementhandle, (SQLCHAR*)"Exec
INFO.dbo.stp_CON_Teste2", SQL_NTS)){
        show_error(SQL_HANDLE_STMT, sqlstatementhandle);
        goto FINISHED;
    }
    else{
        char name[64];
        while(SQLFetch(sqlstatementhandle)==SQL_SUCCESS){
            SQLGetData(sqlstatementhandle, 1, SQL_C_CHAR, name, 64, NULL);
            cout << name << endl;
        }
    }
FINISHED:
    SQLFreeHandle(SQL_HANDLE_STMT, sqlstatementhandle );
    SQLDisconnect(sqlconnectionhandle);
    SQLFreeHandle(SQL_HANDLE_DBC, sqlconnectionhandle);
    SQLFreeHandle(SQL_HANDLE_ENV, sqlenvhandle);
    //pthread_exit(NULL);
}

-- 
João M L Amaral