WS-X4748-RJ45-E non-blocking versus oversubscription
I have a WS-C4507R+E with two of the WS-X4748-RJ45-E linecards in addition to a single Sup7E.
I need to connect eight 6-port portchannels to the WS-X4748-RJ45-Es.
Since the linecards are described as non-blocking do I need to worry about how I connect/group various portchannels?
A best practice would be to distribute 3 ports from each portchannel to each of the WS-X4748-RJ45-E - correct?
I have seen/read questions about ASIC oversubscription for other switches (3K fixed) and line cards, but cannot find anything similar for the WS-X4748-RJ45-E. Does such documentation exist?
Thanks,
Phil
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Posting
Since the linecards are described as non-blocking do I need to worry about how I connect/group various portchannels?
On those line cards, with a sup7E, you can connect to any port you desire.
A best practice would be to distribute 3 ports from each portchannel to each of the WS-X4748-RJ45-E - correct?
Assuming you want to minimize the bandwidth loss to each portchannel if a line card fails, yes.
I have seen/read questions about ASIC oversubscription for other switches (3K fixed) and line cards, but cannot find anything similar for the WS-X4748-RJ45-E.
That because the "intelligence" for 4500s is within the sup, not the line cards.
Similar Messages
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What is the difference between non-blocking and 1:1 oversubscribed?
Could someone tell me what the difference is between a non-blocked port and one with 1:1 oversubscription?
"non-blocking port" and "1:1 oversubscription" are the same. It's also the same when you are saying "line rate".
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Thanks"non-blocking port" and "1:1 oversubscription" are the same. It's also the same when you are saying "line rate".
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When using asynchronous database calls with non-blocking methods, I am getting a persistant error on the CreateSQL method call - the error is "OIP-04153: Non-Blocking operation in progress". This is raised even though the database connection has been closed and restarted and no non-blocking operations called. The methods used are similar to the following example code:
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Dim OraStmt as OraSQLStmt
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I cannot cancel the operation using OraStmt.Cancel because OraStmt Is Nothing!Actually, that is not correct. All of the 48 port Gig-E line cards for the 6500 are oversubscribed; it does vary by the degree of oversubscription.
In a 6506 or a 6509 (with a Sup720) you have (2) 20 Gbps connections (per slot) to the fabric. With a WS-X6748-GE-TX you have a potential for 48 (Full Duplex) Gbps of traffic, but only 2 connections to the fabric. This yields an oversubscription rate of 1.2:1 (or 48:40) assuming a worst case scenario.
It should be noted that the 24 port 67xx cards are still oversubscribed as well, because they only have one connection to the fabric. There is a potential for 24 Gbps of traffic and only (1) 20 Gbps fabric connection, so it has an identical oversubscription rate.
By using only 24 of the 48 possible ports, depending on which ones you choose, you should be OK. But I do not know which ports use which fabric connection on the backplane, so I can't assist you in picking them.
It should be noted that in most environments it is unlikely every port will be a 100% utilized so the risk of dropping packets because of oversubscription is low. -
SQL Developer blocking vs non-blocking
Hi,
Is there a way in SQL Developer 3.0 to have a non-blocking SQL call? In Oracle Forms we can choose between blocking and non-blocking SQL Net connections to the database. Does SQL Developer have the same capability? If so where exactly are those options hidden in the preferences menus?
Annoyed,
ScottK
Edited by: ScottK on Jun 1, 2011 11:20 AMHi ScottK,
SQLDeveloper locks access to individual connections when they are in use, if you want to simulate
some aspects of non blocking behaviour you can use other connections.
The following features might help:
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ORA-03118 two-task error while doing a non blocking OCI call
Hi,
I have an application that runs on Linux and uses OCI API (version 8.1.6).
If I do the following in non blocking mode after polling about
70 times I get the error:
ORA-03118: two-task coroutine has invalid state
do {
call_cnt++;
rtc = OCIStmtFetch(stmtptr->stmt, oracle_err, 1, OCI_FETCH_NEXT,
OCI_DEFAULT);
} while (rtc == OCI_STILL_EXECUTING);
This doesn't happen all the time but it happens most often on big selects.
Does anyone have any idea what is happening here?
I have searched for related information but have come up dry. If anyone
knows anything or maybe a better place to ask this question please tell me.
Thanks,
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nullAsk your basis guys to increase the table space...
check this thread...
[Error : DBIF_RSQL_SQL_ERROR;
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Implementing non-blocking read
Hi all
I have some doubts about implementing non-blocking io in my application.
I am using Jsch library (an ssh implementation) to open an ssh connection with a host. The API only provides me with methods to open a connection and retreive the input & output streams. I want to make my read on inputstream non-blocking.In such a case is it possible to use nio for the purpose?
If it's not possible then I am planning to use threading to make read() non-blocking. Here also i need some clarifications. I am planning to use a ThreadPoolExecutor to create a thread pool for reading data. SO whenever i have a read i'll assign this task to the pool which will use one of the free threads to execute the inputStresm.read().
Now the question is if one of the threads in this pool blocks forever during a read since it didn't get any response from the other side, is there a way to stop that read and make that thread free again to execute more tasks? or will the thread block forever till the application is closed?
In my case i cannot afford to have too many such blocked threads, since this application will not be restarted very often. Once it is started it can go on for may be days or months.
Please suggest what would be best in my case taking into account performance as most important factor.
Thanks in advance.
Anuendasil wrote:
First of all, let me state that I agree with the others in saying that I don't fully agree with your premises.
That said, I believe that this does a non-blocking read based on the contract of InputStream.available() and .read(byte[], int, int):
private int nonBlockingRead(InputStream in, byte[] buffer) throws IOException {
return in.read(buffer, 0, Math.min(in.available(), buffer.length));
If the InputStream is obtained from a JSSE socket then it is my understanding that available() always returns zero. This is allowed under the InputStream.available() contract as defined in the Javadoc - http://java.sun.com/javase/6/docs/api/java/io/InputStream.html#available() . If I am right then your code will never read anything from a JSSE socket InputStream and I would suspect that Jsch is using JSSE sockets. -
Application Builder: Can you create non-blocking, return-immediately functions in a dll?
I need to include a procedure in a dll that is non-blocking, i.e. it should return immediately after the procedure has been called, and not return after its processes are completed.
The procedure is a LabView 7.0 VI, and the dll is being created using the Application Builder. Currently the procedure completes its desired task and then returns, but I would like the function to return immediately. Thanks for your help!Rischaard,
I don't know if that will work in a dll, however as an idea:
use the vi-server functions:
Your dll-procedure opens a OwnTreat.vi(wich will do the work) with vi-server, and run it without waiting for completion.
First thing OwnTreat.vi should do is opening (with vi-server) a reference to itself (So your caller dll can close without stopping the OwnTreat.vi)
Then OwnTreat.vi con do what YOU want. When finished close the self-reference
Maybe you need a short wait or a feedback to make sure that OwnTreat has opened his own reverence before your dll stops.
Greetings from Germany
Henrik
LV since v3.1
“ground” is a convenient fantasy
'˙˙˙˙uıɐƃɐ lɐıp puɐ °06 ǝuoɥd ɹnoʎ uɹnʇ ǝsɐǝld 'ʎɹɐuıƃɐɯı sı pǝlɐıp ǝʌɐɥ noʎ ɹǝqɯnu ǝɥʇ' -
Using OCIBindDynamic with non-blocking connections
I need to use an OCI array interface for execute statements more than once per one request to server.
When I have called stored procedure or function in the non-blocking connection context using OCIBindDynamic for parameter binding, application have been crashed at random time.
I don't have any problems using default (blocking) mode.
Environment:
Oracle 8.1.7 release 3 for Windows
MS Visual C++ 6.0 compiler
Could anybody help me ?It's always possible in any read that the number of bytes read is less than the number of bytes requested. You need to keep reading until you have got everything you expected, and cope with every possible error condition on each iteration.
EJP -
NIO: Strange problem when using ByteBuffer with non-blocking SocketChannel
Hi,
I have a server that uses multiplexed, non-blocking I/O with java.nio. When a client connects, the server waits for the message: <system cmd="knock"/>, returns a message and disconnects the client. The clients are shortly serviced in less than a second.
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ByteBuffer receiveBuf = ByteBuffer.allocate(65536);
receiveBuf.clear(); // the code is elsewhere used for longer living clients
int readBytes = channel.read(receiveBuf);
receiveBuf.flip();
StringBuffer sb = new StringBuffer();
System.out.println(" * Remaining: "+receiveBuf.remaining()); // writes: ' * Remaining: 0'
System.out.println(" * Received: "+new String(receiveBuf.array())); // writes: ' * Received: <system cmd="knock"/>'
while(receiveBuf.remaining() >= 2) {
byte b = receiveBuf.get();
sb.append((char)b);
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The problem seems to occur randomly and for about 20% of the clients (simulated from the same computer and therefore has the same bandwidth and so on).
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SELECT of OCILobLocator in Non Blocking mode
Hi all.
I have problem:
I try select BLOB field into OCILobLocator* buffer in Non Blocking mode, and receive 'ORA-03106: fatal two-task communication protocol error' sometimes.
Details:
Application contains two threads : 1. select blob field, 2. update it.
I tried separate update and select to different apps (and run its in one time) - problem reproduced.
problem reproduced for OCIStmtFetch and OCIStmtFetch2.
If disable non blocking mode - problem disappear.
if error appear - record level error code contains 1405. Need wait few minutes for error message appearing (~1 minute in my case).
Using of OCI_DEFAULT in OCIDefineByPos instead OCI_DYNAMIC_FETCH don't solve problem.
I use oracle server and client library with version 10.2.0.4
Output sample:
execute_select(): can't make OCIStmtFetch2: status = -1, message = 'ORA-03106: fatal two-task communication protocol error
', error code = 3106, row errors: #877: 1405
execute_select(): can't make OCIStmtFetch2: status = -1, message = 'ORA-03106: fatal two-task communication protocol error
', error code = 3106, row errors: #54: 1405
execute_select(): can't make OCIStmtFetch2: status = -1, message = 'ORA-03106: fatal two-task communication protocol error
', error code = 3106, row errors: #877: 1405
execute_select(): can't make OCIStmtFetch2: status = -1, message = 'ORA-03106: fatal two-task communication protocol error
', error code = 3106, row errors: #54: 1405
Can anybody help me ?
m.b. exists workaround ?
#include <iostream>
#include <sstream>
#include <assert.h>
#include <oci.h>
#define _DYN 1
before run this test run next sql at DB:
CREATE TABLE ADSERVERTEST_BLOB(id NUMBER(10), text BLOB);
BEGIN
FOR i IN 0..999 LOOP
INSERT INTO ADSERVERTEST_BLOB(id, text) VALUES(i, utl_raw.cast_to_raw('init'));
END LOOP;
END;
template<typename Type, unsigned long TypeId>
class OCIHandlePtr
public:
OCIHandlePtr(): handle_(0) {}
OCIHandlePtr(Type* handle): handle_(handle) {}
~OCIHandlePtr()
reset(0);
void reset(Type* handle)
if(handle_)
sword result;
if((result = OCIHandleFree(
handle_,
TypeId)) != OCI_SUCCESS)
assert(0);
std::cerr << "Can't make OCIHandleFree" << std::endl;
handle_ = handle;
Type* get()
return handle_;
Type*& fill()
reset(0);
return handle_;
private:
Type* handle_;
template<typename Type, unsigned long TypeId>
class OCIDescriptorPtr
public:
OCIDescriptorPtr(): handle_(0) {}
OCIDescriptorPtr(Type* handle): handle_(handle) {}
~OCIDescriptorPtr()
reset(0);
void reset(Type* handle)
if(handle_)
sword result;
if((result = OCIDescriptorFree(
handle_,
TypeId)) != OCI_SUCCESS)
std::cerr << "Can't make OCIDescriptorFree" << std::endl;
handle_ = handle;
Type* get()
return handle_;
Type*& fill()
reset(0);
return handle_;
private:
Type* handle_;
void throw_oci_error(
const char* fun,
const char* oci_op,
long status,
OCIError* oci_error_handler,
const char* query = 0)
std::cerr << fun << ": can't make " << oci_op << ": status = " << status;
if(status == OCI_SUCCESS_WITH_INFO ||
status == OCI_ERROR)
std::cerr << ", message = '";
text err_buf[1024] = "";
sb4 err_code = 0;
OCIErrorGet(
oci_error_handler,
(ub4)1,
0,
&err_code,
err_buf,
sizeof(err_buf),
(ub4)OCI_HTYPE_ERROR);
std::cerr << err_buf << "', error code = " << err_code;
exit(1);
if(query)
std::cerr << ", sql = " << query;
OCIHandlePtr<OCIEnv, OCI_HTYPE_ENV> environment_handle;
void connect(
OCIEnv* environment_handle,
const char* db,
const char* user,
const char* password,
OCIHandlePtr<OCIError, OCI_HTYPE_ERROR>& error_handle,
OCIHandlePtr<OCIServer, OCI_HTYPE_SERVER>& server_handle,
OCIHandlePtr<OCISession, OCI_HTYPE_SESSION>& session_handle,
OCIHandlePtr<OCISvcCtx, OCI_HTYPE_SVCCTX>& svc_context_handle)
static const char* FUN = "connect()";
sword result;
// allocate an error handle
if((result = OCIHandleAlloc(
environment_handle,
(void **) &error_handle.fill(),
OCI_HTYPE_ERROR,
0, // extra memory to allocate
0)) != OCI_SUCCESS)
throw_oci_error(FUN, "OCIHandleAlloc", result, error_handle.get());
// allocate a server handle
if((result = OCIHandleAlloc(
environment_handle,
(void **) &server_handle.fill(),
OCI_HTYPE_SERVER,
0, // extra memory to allocate
0)) != OCI_SUCCESS)
throw_oci_error(FUN, "OCIHandleAlloc", result, error_handle.get());
if((result = OCIServerAttach(
server_handle.get(),
error_handle.get(),
(text*)db,
strlen(db),
OCI_DEFAULT)) != OCI_SUCCESS)
throw_oci_error(FUN, "OCIServerAttach", result, error_handle.get());
// allocate a service handle
if((result = OCIHandleAlloc(
environment_handle,
(void **) &svc_context_handle.fill(),
OCI_HTYPE_SVCCTX,
0, // extra memory to allocate
0)) != OCI_SUCCESS)
throw_oci_error(FUN, "OCIHandleAlloc", result, error_handle.get());
// set the server attribute in the service context handle
if((result = OCIAttrSet(
svc_context_handle.get(),
OCI_HTYPE_SVCCTX,
server_handle.get(),
sizeof(OCIServer*),
OCI_ATTR_SERVER,
error_handle.get())) != OCI_SUCCESS)
throw_oci_error(FUN, "OCIHandleAlloc", result, error_handle.get());
// allocate a user session handle
if((result = OCIHandleAlloc(
environment_handle,
(void **)&session_handle.fill(),
OCI_HTYPE_SESSION,
0, // extra memory to allocate
0)) != OCI_SUCCESS)
throw_oci_error(FUN, "OCIHandleAlloc", result, error_handle.get());
// set username and password attributes in user session handle
if((result = OCIAttrSet(
session_handle.get(),
OCI_HTYPE_SESSION,
(text*)user,
strlen(user),
OCI_ATTR_USERNAME,
error_handle.get())) != OCI_SUCCESS)
throw_oci_error(FUN, "OCIAttrSet", result, error_handle.get());
if((result = OCIAttrSet(
session_handle.get(),
OCI_HTYPE_SESSION,
(text*)password,
strlen(password),
OCI_ATTR_PASSWORD,
error_handle.get())) != OCI_SUCCESS)
throw_oci_error(FUN, "OCIAttrSet", result, error_handle.get());
// start the session
if((result = OCISessionBegin(
svc_context_handle.get(),
error_handle.get(),
session_handle.get(),
OCI_CRED_RDBMS,
OCI_DEFAULT)) != OCI_SUCCESS)
throw_oci_error(FUN, "OCISessionBegin", result, error_handle.get());
// set the user session attribute in the service context handle
if((result = OCIAttrSet(
svc_context_handle.get(),
OCI_HTYPE_SVCCTX,
session_handle.get(),
sizeof(OCISession*),
OCI_ATTR_SESSION,
error_handle.get())) != OCI_SUCCESS)
throw_oci_error(FUN, "OCIAttrSet", result, error_handle.get());
ub1 attr_value = 1;
if((result = OCIAttrSet(
server_handle.get(),
OCI_HTYPE_SERVER,
&attr_value,
sizeof(attr_value),
OCI_ATTR_NONBLOCKING_MODE,
error_handle.get())) != OCI_SUCCESS)
throw_oci_error(FUN, "OCIAttrSet", result, error_handle.get());
void disconnect(
OCIEnv* environment_handle,
OCIError* error_handle,
OCIServer* server_handle,
OCISession* session_handle,
OCISvcCtx* svc_context_handle)
static const char* FUN = "disconnect()";
sword result;
if((result = OCISessionEnd(
svc_context_handle,
error_handle,
session_handle,
OCI_DEFAULT)) != OCI_SUCCESS)
throw_oci_error(FUN, "OCISessionEnd", result, error_handle);
if((result = OCIServerDetach(
server_handle,
error_handle,
OCI_DEFAULT)) != OCI_SUCCESS)
throw_oci_error(FUN, "OCIServerDetach", result, error_handle);
OCILobLocator* FETCH_BUFFER_1[10000*1024];
char IND_BUFFER_1[10000*1024];
ub2 ERROR_BUFFER_1[1024];
OCIDefine* define_handle_1;
void clear_blob_buf(
OCILobLocator** buf,
unsigned long fetch_size)
for(unsigned long i = 0; i < 1024; ++i)
OCIDescriptorFree(
buf,
(ub4)OCI_DTYPE_LOB);
::memset(buf, 0, fetch_size * 1024);
uint32_t RET_LEN4;
sb4 oci_blob_callback(
dvoid* ctx,
OCIDefine* define,
ub4 iter,
dvoid** bufpp,
ub4** alenpp,
ub1* piecep,
dvoid** indpp,
ub2** rcodepp)
RET_LEN4 = sizeof(OCILobLocator*);
*bufpp = FETCH_BUFFER_1[iter];
*alenpp = &RET_LEN4;
*piecep = OCI_ONE_PIECE;
*indpp = IND_BUFFER_1 + iter;
*rcodepp = ERROR_BUFFER_1 + iter;
//std::cout << "iter: " << iter << std::endl;
return OCI_CONTINUE;
int define_column(
OCIEnv* environment_handle,
OCISvcCtx* svc_handle,
OCIStmt* stmt_handle,
OCIError* error_handle,
OCIDefine** define_handle,
unsigned long pos,
long oci_type,
unsigned long fetch_size,
OCILobLocator** buf,
char* ind_buf,
ub2* err_buf)
static const char* FUN = "define_column()";
sword result;
if(oci_type == SQLT_BLOB)
::memset(buf, 0, fetch_size * 1024);
for(int i = 0; i < 1024; ++i)
if((result = OCIDescriptorAlloc(
(dvoid*)environment_handle,
(dvoid**)&buf[i],
(ub4)OCI_DTYPE_LOB,
(size_t)0,
(dvoid**)0)) != OCI_SUCCESS)
throw_oci_error(FUN, "OCIDescriptorAlloc", result, error_handle);
ub2 size = 0;
OCIDescriptorPtr<OCIParam, OCI_DTYPE_PARAM> param_handle;
// ub2 oci_data_type = 0;
if((result = OCIParamGet(
stmt_handle,
OCI_HTYPE_STMT,
error_handle,
reinterpret_cast<void**>(¶m_handle.fill()),
pos)) != OCI_SUCCESS)
throw_oci_error(FUN, "OCIParamGet", result, error_handle);
if((result = OCIAttrGet(
param_handle.get(),
OCI_DTYPE_PARAM,
&size,
0,
OCI_ATTR_DATA_SIZE,
error_handle)) != OCI_SUCCESS)
throw_oci_error(FUN, "OCIAttrGet", result, error_handle);
if((result = OCIDefineByPos(
stmt_handle,
define_handle,
error_handle,
pos,
# ifdef _DYN
0,
-1,
#else
buf,
fetch_size,
#endif
oci_type,
ind_buf,
0,
err_buf, // ptr to array of column-level return codes
# ifdef _DYN
OCI_DYNAMIC_FETCH
# else
OCI_DEFAULT
# endif
)) != OCI_SUCCESS)
throw_oci_error(FUN, "OCIDefineByPos", result, error_handle);
# ifdef _DYN
if((result = OCIDefineDynamic(
*define_handle,
error_handle,
0,
oci_blob_callback)) != OCI_SUCCESS)
throw_oci_error(FUN, "OCIDefineByPos", result, error_handle);
# endif
return 0;
int define_columns(
OCIEnv* environment_handle,
OCISvcCtx* svc_handle,
OCIStmt* stmt_handle,
OCIError* error_handle)
static const char* FUN = "define_columns()";
define_handle_1 = 0;
int pos = 1;
::memset(ERROR_BUFFER_1, 0, 1024 * sizeof(ERROR_BUFFER_1[0]));
define_column(
environment_handle,
svc_handle,
stmt_handle,
error_handle,
&define_handle_1,
pos++,
SQLT_BLOB,
sizeof(OCILobLocator*),
FETCH_BUFFER_1,
IND_BUFFER_1,
ERROR_BUFFER_1);
return 0;
int execute_select(
const char* db,
const char* user,
const char* password)
static const char* FUN = "execute_select()";
const unsigned long FETCH_COUNT = 1024;
OCIHandlePtr<OCIError, OCI_HTYPE_ERROR> error_handle;
OCIHandlePtr<OCIServer, OCI_HTYPE_SERVER> server_handle;
OCIHandlePtr<OCISession, OCI_HTYPE_SESSION> session_handle;
OCIHandlePtr<OCISvcCtx, OCI_HTYPE_SVCCTX> svc_context_handle;
connect(
environment_handle.get(),
db,
user,
password,
error_handle,
server_handle,
session_handle,
svc_context_handle);
OCIHandlePtr<OCIStmt, OCI_HTYPE_STMT> stmt_handle;
sword result;
if((result = OCIHandleAlloc(
environment_handle.get(),
(void**)&stmt_handle.fill(),
OCI_HTYPE_STMT,
0,
0)) != OCI_SUCCESS)
throw_oci_error(FUN, "OCIHandleAlloc", result, error_handle.get());
const char QUERY[] = "SELECT text FROM ADSERVERTEST_BLOB";
ub4 rows = 0;
if((result = OCIAttrSet(
stmt_handle.get(),
OCI_HTYPE_STMT,
(dvoid *)&rows,
(ub4)sizeof(ub4),
OCI_ATTR_PREFETCH_ROWS,
error_handle.get())) != OCI_SUCCESS)
throw_oci_error(
FUN, "OCIAttrSet(OCI_ATTR_PREFETCH_ROWS)", result, error_handle.get());
if((result = OCIStmtPrepare(
stmt_handle.get(),
error_handle.get(),
(text*)QUERY,
strlen(QUERY),
OCI_NTV_SYNTAX,
OCI_DEFAULT)) != OCI_SUCCESS)
throw_oci_error(FUN, "OCIStmtPrepare", result, error_handle.get());
ub2 stmt_type;
if((result = OCIAttrGet(
stmt_handle.get(),
OCI_HTYPE_STMT,
&stmt_type,
0,
OCI_ATTR_STMT_TYPE,
error_handle.get())) != OCI_SUCCESS)
throw_oci_error(FUN, "OCIAttrGet", result, error_handle.get());
ub4 prev_fetched = 0;
while((result = OCIStmtExecute(
svc_context_handle.get(),
stmt_handle.get(),
error_handle.get(),
0,
0,
0,
0,
OCI_DEFAULT)) != OCI_SUCCESS)
if(result != OCI_STILL_EXECUTING)
throw_oci_error(FUN, "OCIStmtExecute", result, error_handle.get());
define_columns(
environment_handle.get(),
svc_context_handle.get(),
stmt_handle.get(),
error_handle.get());
ub4 all_fetched_count = 0;
while(true)
while((result = OCIStmtFetch2(
stmt_handle.get(),
error_handle.get(),
FETCH_COUNT,
OCI_FETCH_NEXT,
1,
OCI_DEFAULT)) == OCI_STILL_EXECUTING
# ifdef _DYN
// || result == OCI_NEED_DATA
# endif
if (result != OCI_SUCCESS &&
result != OCI_NO_DATA &&
result != OCI_SUCCESS_WITH_INFO)
std::cerr << FUN << ": can't make OCIStmtFetch2: status = " << result;
std::cerr << ", message = '";
text err_buf[1024] = "";
sb4 err_code = 0;
OCIErrorGet(
error_handle.get(),
(ub4)1,
0,
&err_code,
err_buf,
sizeof(err_buf),
(ub4)OCI_HTYPE_ERROR);
std::cerr << err_buf << "', error code = " << err_code << ", row errors: ";
for(const ub2* cur = ERROR_BUFFER_1;
cur < ERROR_BUFFER_1 + 1024; ++cur)
if(*cur)
std::cerr << "#" << (cur - ERROR_BUFFER_1) << ": " <<
*cur << std::endl;
ub4 fetched_count = 0;
if((result = OCIAttrGet (
stmt_handle.get(),
OCI_HTYPE_STMT,
&fetched_count,
0,
OCI_ATTR_ROW_COUNT,
error_handle.get())) != OCI_SUCCESS)
throw_oci_error(FUN, "OCIAttrGet", result, error_handle.get());
all_fetched_count += fetched_count;
if(fetched_count > 0)
for(unsigned long i = 0; i < fetched_count - 1; ++i)
ub4 lob_size;
while((result = OCILobGetLength(
svc_context_handle.get(),
error_handle.get(),
FETCH_BUFFER_1[i],
&lob_size)) == OCI_STILL_EXECUTING)
if(result != OCI_SUCCESS)
throw_oci_error(FUN, "OCILobGetLength", result, error_handle.get());
std::cout << "#" << i << ": ind = " << (unsigned long)IND_BUFFER_1[i] <<
", len = " << lob_size << std::endl;
if(fetched_count - prev_fetched < FETCH_COUNT)
break;
prev_fetched = fetched_count;
clear_blob_buf(
FETCH_BUFFER_1,
sizeof(OCILobLocator*));
while((result = OCIStmtFetch(
stmt_handle.get(),
error_handle.get(),
0,
OCI_FETCH_NEXT,
OCI_DEFAULT)) == OCI_STILL_EXECUTING
disconnect(
environment_handle.get(),
error_handle.get(),
server_handle.get(),
session_handle.get(),
svc_context_handle.get());
return 0;
int execute_update(
const char* db,
const char* user,
const char* password)
static const char* FUN = "execute_update()";
OCIHandlePtr<OCIError, OCI_HTYPE_ERROR> error_handle;
OCIHandlePtr<OCIServer, OCI_HTYPE_SERVER> server_handle;
OCIHandlePtr<OCISession, OCI_HTYPE_SESSION> session_handle;
OCIHandlePtr<OCISvcCtx, OCI_HTYPE_SVCCTX> svc_context_handle;
connect(
environment_handle.get(),
db,
user,
password,
error_handle,
server_handle,
session_handle,
svc_context_handle);
OCIHandlePtr<OCIStmt, OCI_HTYPE_STMT> stmt_handle;
for(int i = 0; i < 1000; ++i)
sword result;
if((result = OCIHandleAlloc(
environment_handle.get(),
(void**)&stmt_handle.fill(),
OCI_HTYPE_STMT,
0,
0)) != OCI_SUCCESS)
throw_oci_error(FUN, "OCIHandleAlloc", result, error_handle.get());
std::ostringstream sql;
std::string str;
std::string et("\xEB\xB2\x88");
unsigned long rep = ::rand() % 500 + 1;
str.reserve(rep*et.size());
for(unsigned long ei = 0; ei < rep; ++ei)
str.append(et);
sql << "BEGIN " <<
"UPDATE ADSERVERTEST_BLOB SET text = "
"utl_raw.cast_to_raw('" << str << "') "
"WHERE id = " << i <<
"END;";
if((result = OCIStmtPrepare(
stmt_handle.get(),
error_handle.get(),
(text*)sql.str().c_str(),
sql.str().length(),
OCI_NTV_SYNTAX,
OCI_DEFAULT)) != OCI_SUCCESS)
throw_oci_error(FUN, "OCIStmtPrepare", result, error_handle.get());
while((result = OCIStmtExecute(
svc_context_handle.get(),
stmt_handle.get(),
error_handle.get(),
1,
0,
0,
0,
OCI_DEFAULT)) != OCI_SUCCESS)
if(result != OCI_STILL_EXECUTING)
throw_oci_error(FUN, "OCIStmtExecute", result, error_handle.get());
disconnect(
environment_handle.get(),
error_handle.get(),
server_handle.get(),
session_handle.get(),
svc_context_handle.get());
return 0;
void* select_thread(void* ctx)
while(true)
execute_select(
"//oraclept.ocslab.com/addbpt.ocslab.com",
"bs_unittest_4",
"adserver");
// std::cout << "select finished" << std::endl;
return ctx;
void* update_thread(void* ctx)
while(true)
execute_update(
"//oraclept.ocslab.com/addbpt.ocslab.com",
"bs_unittest_4",
"adserver");
// std::cout << "update finished" << std::endl;
return ctx;
int main()
static const char* FUN = "main()";
sword result;
// allocate an environment handle
if((result = OCIEnvCreate(
&environment_handle.fill(),
OCI_OBJECT | OCI_THREADED,
0, // context
0, // malloc
0, // realloc
0, // free
0, // extra memory to allocate
0) // pointer to user-memory
) != OCI_SUCCESS)
throw_oci_error(FUN, "OCIEnvCreate", result, 0);
pthread_t th1, th2;
pthread_create(&th1, 0, select_thread, 0);
pthread_create(&th2, 0, update_thread, 0);
pthread_join(th1, 0);
pthread_join(th2, 0);
return 0;
Edited by: user13011391 on 20.04.2010 5:50
Edited by: user13011391 on 20.04.2010 6:00
Edited by: user13011391 on 20.04.2010 6:15Hi all.
I have problem:
I try select BLOB field into OCILobLocator* buffer in Non Blocking mode, and receive 'ORA-03106: fatal two-task communication protocol error' sometimes.
Details:
Application contains two threads : 1. select blob field, 2. update it.
I tried separate update and select to different apps (and run its in one time) - problem reproduced.
problem reproduced for OCIStmtFetch and OCIStmtFetch2.
If disable non blocking mode - problem disappear.
if error appear - record level error code contains 1405. Need wait few minutes for error message appearing (~1 minute in my case).
Using of OCI_DEFAULT in OCIDefineByPos instead OCI_DYNAMIC_FETCH don't solve problem.
I use oracle server and client library with version 10.2.0.4
Output sample:
execute_select(): can't make OCIStmtFetch2: status = -1, message = 'ORA-03106: fatal two-task communication protocol error
', error code = 3106, row errors: #877: 1405
execute_select(): can't make OCIStmtFetch2: status = -1, message = 'ORA-03106: fatal two-task communication protocol error
', error code = 3106, row errors: #54: 1405
execute_select(): can't make OCIStmtFetch2: status = -1, message = 'ORA-03106: fatal two-task communication protocol error
', error code = 3106, row errors: #877: 1405
execute_select(): can't make OCIStmtFetch2: status = -1, message = 'ORA-03106: fatal two-task communication protocol error
', error code = 3106, row errors: #54: 1405
Can anybody help me ?
m.b. exists workaround ?
#include <iostream>
#include <sstream>
#include <assert.h>
#include <oci.h>
#define _DYN 1
before run this test run next sql at DB:
CREATE TABLE ADSERVERTEST_BLOB(id NUMBER(10), text BLOB);
BEGIN
FOR i IN 0..999 LOOP
INSERT INTO ADSERVERTEST_BLOB(id, text) VALUES(i, utl_raw.cast_to_raw('init'));
END LOOP;
END;
template<typename Type, unsigned long TypeId>
class OCIHandlePtr
public:
OCIHandlePtr(): handle_(0) {}
OCIHandlePtr(Type* handle): handle_(handle) {}
~OCIHandlePtr()
reset(0);
void reset(Type* handle)
if(handle_)
sword result;
if((result = OCIHandleFree(
handle_,
TypeId)) != OCI_SUCCESS)
assert(0);
std::cerr << "Can't make OCIHandleFree" << std::endl;
handle_ = handle;
Type* get()
return handle_;
Type*& fill()
reset(0);
return handle_;
private:
Type* handle_;
template<typename Type, unsigned long TypeId>
class OCIDescriptorPtr
public:
OCIDescriptorPtr(): handle_(0) {}
OCIDescriptorPtr(Type* handle): handle_(handle) {}
~OCIDescriptorPtr()
reset(0);
void reset(Type* handle)
if(handle_)
sword result;
if((result = OCIDescriptorFree(
handle_,
TypeId)) != OCI_SUCCESS)
std::cerr << "Can't make OCIDescriptorFree" << std::endl;
handle_ = handle;
Type* get()
return handle_;
Type*& fill()
reset(0);
return handle_;
private:
Type* handle_;
void throw_oci_error(
const char* fun,
const char* oci_op,
long status,
OCIError* oci_error_handler,
const char* query = 0)
std::cerr << fun << ": can't make " << oci_op << ": status = " << status;
if(status == OCI_SUCCESS_WITH_INFO ||
status == OCI_ERROR)
std::cerr << ", message = '";
text err_buf[1024] = "";
sb4 err_code = 0;
OCIErrorGet(
oci_error_handler,
(ub4)1,
0,
&err_code,
err_buf,
sizeof(err_buf),
(ub4)OCI_HTYPE_ERROR);
std::cerr << err_buf << "', error code = " << err_code;
exit(1);
if(query)
std::cerr << ", sql = " << query;
OCIHandlePtr<OCIEnv, OCI_HTYPE_ENV> environment_handle;
void connect(
OCIEnv* environment_handle,
const char* db,
const char* user,
const char* password,
OCIHandlePtr<OCIError, OCI_HTYPE_ERROR>& error_handle,
OCIHandlePtr<OCIServer, OCI_HTYPE_SERVER>& server_handle,
OCIHandlePtr<OCISession, OCI_HTYPE_SESSION>& session_handle,
OCIHandlePtr<OCISvcCtx, OCI_HTYPE_SVCCTX>& svc_context_handle)
static const char* FUN = "connect()";
sword result;
// allocate an error handle
if((result = OCIHandleAlloc(
environment_handle,
(void **) &error_handle.fill(),
OCI_HTYPE_ERROR,
0, // extra memory to allocate
0)) != OCI_SUCCESS)
throw_oci_error(FUN, "OCIHandleAlloc", result, error_handle.get());
// allocate a server handle
if((result = OCIHandleAlloc(
environment_handle,
(void **) &server_handle.fill(),
OCI_HTYPE_SERVER,
0, // extra memory to allocate
0)) != OCI_SUCCESS)
throw_oci_error(FUN, "OCIHandleAlloc", result, error_handle.get());
if((result = OCIServerAttach(
server_handle.get(),
error_handle.get(),
(text*)db,
strlen(db),
OCI_DEFAULT)) != OCI_SUCCESS)
throw_oci_error(FUN, "OCIServerAttach", result, error_handle.get());
// allocate a service handle
if((result = OCIHandleAlloc(
environment_handle,
(void **) &svc_context_handle.fill(),
OCI_HTYPE_SVCCTX,
0, // extra memory to allocate
0)) != OCI_SUCCESS)
throw_oci_error(FUN, "OCIHandleAlloc", result, error_handle.get());
// set the server attribute in the service context handle
if((result = OCIAttrSet(
svc_context_handle.get(),
OCI_HTYPE_SVCCTX,
server_handle.get(),
sizeof(OCIServer*),
OCI_ATTR_SERVER,
error_handle.get())) != OCI_SUCCESS)
throw_oci_error(FUN, "OCIHandleAlloc", result, error_handle.get());
// allocate a user session handle
if((result = OCIHandleAlloc(
environment_handle,
(void **)&session_handle.fill(),
OCI_HTYPE_SESSION,
0, // extra memory to allocate
0)) != OCI_SUCCESS)
throw_oci_error(FUN, "OCIHandleAlloc", result, error_handle.get());
// set username and password attributes in user session handle
if((result = OCIAttrSet(
session_handle.get(),
OCI_HTYPE_SESSION,
(text*)user,
strlen(user),
OCI_ATTR_USERNAME,
error_handle.get())) != OCI_SUCCESS)
throw_oci_error(FUN, "OCIAttrSet", result, error_handle.get());
if((result = OCIAttrSet(
session_handle.get(),
OCI_HTYPE_SESSION,
(text*)password,
strlen(password),
OCI_ATTR_PASSWORD,
error_handle.get())) != OCI_SUCCESS)
throw_oci_error(FUN, "OCIAttrSet", result, error_handle.get());
// start the session
if((result = OCISessionBegin(
svc_context_handle.get(),
error_handle.get(),
session_handle.get(),
OCI_CRED_RDBMS,
OCI_DEFAULT)) != OCI_SUCCESS)
throw_oci_error(FUN, "OCISessionBegin", result, error_handle.get());
// set the user session attribute in the service context handle
if((result = OCIAttrSet(
svc_context_handle.get(),
OCI_HTYPE_SVCCTX,
session_handle.get(),
sizeof(OCISession*),
OCI_ATTR_SESSION,
error_handle.get())) != OCI_SUCCESS)
throw_oci_error(FUN, "OCIAttrSet", result, error_handle.get());
ub1 attr_value = 1;
if((result = OCIAttrSet(
server_handle.get(),
OCI_HTYPE_SERVER,
&attr_value,
sizeof(attr_value),
OCI_ATTR_NONBLOCKING_MODE,
error_handle.get())) != OCI_SUCCESS)
throw_oci_error(FUN, "OCIAttrSet", result, error_handle.get());
void disconnect(
OCIEnv* environment_handle,
OCIError* error_handle,
OCIServer* server_handle,
OCISession* session_handle,
OCISvcCtx* svc_context_handle)
static const char* FUN = "disconnect()";
sword result;
if((result = OCISessionEnd(
svc_context_handle,
error_handle,
session_handle,
OCI_DEFAULT)) != OCI_SUCCESS)
throw_oci_error(FUN, "OCISessionEnd", result, error_handle);
if((result = OCIServerDetach(
server_handle,
error_handle,
OCI_DEFAULT)) != OCI_SUCCESS)
throw_oci_error(FUN, "OCIServerDetach", result, error_handle);
OCILobLocator* FETCH_BUFFER_1[10000*1024];
char IND_BUFFER_1[10000*1024];
ub2 ERROR_BUFFER_1[1024];
OCIDefine* define_handle_1;
void clear_blob_buf(
OCILobLocator** buf,
unsigned long fetch_size)
for(unsigned long i = 0; i < 1024; ++i)
OCIDescriptorFree(
buf,
(ub4)OCI_DTYPE_LOB);
::memset(buf, 0, fetch_size * 1024);
uint32_t RET_LEN4;
sb4 oci_blob_callback(
dvoid* ctx,
OCIDefine* define,
ub4 iter,
dvoid** bufpp,
ub4** alenpp,
ub1* piecep,
dvoid** indpp,
ub2** rcodepp)
RET_LEN4 = sizeof(OCILobLocator*);
*bufpp = FETCH_BUFFER_1[iter];
*alenpp = &RET_LEN4;
*piecep = OCI_ONE_PIECE;
*indpp = IND_BUFFER_1 + iter;
*rcodepp = ERROR_BUFFER_1 + iter;
//std::cout << "iter: " << iter << std::endl;
return OCI_CONTINUE;
int define_column(
OCIEnv* environment_handle,
OCISvcCtx* svc_handle,
OCIStmt* stmt_handle,
OCIError* error_handle,
OCIDefine** define_handle,
unsigned long pos,
long oci_type,
unsigned long fetch_size,
OCILobLocator** buf,
char* ind_buf,
ub2* err_buf)
static const char* FUN = "define_column()";
sword result;
if(oci_type == SQLT_BLOB)
::memset(buf, 0, fetch_size * 1024);
for(int i = 0; i < 1024; ++i)
if((result = OCIDescriptorAlloc(
(dvoid*)environment_handle,
(dvoid**)&buf[i],
(ub4)OCI_DTYPE_LOB,
(size_t)0,
(dvoid**)0)) != OCI_SUCCESS)
throw_oci_error(FUN, "OCIDescriptorAlloc", result, error_handle);
ub2 size = 0;
OCIDescriptorPtr<OCIParam, OCI_DTYPE_PARAM> param_handle;
// ub2 oci_data_type = 0;
if((result = OCIParamGet(
stmt_handle,
OCI_HTYPE_STMT,
error_handle,
reinterpret_cast<void**>(¶m_handle.fill()),
pos)) != OCI_SUCCESS)
throw_oci_error(FUN, "OCIParamGet", result, error_handle);
if((result = OCIAttrGet(
param_handle.get(),
OCI_DTYPE_PARAM,
&size,
0,
OCI_ATTR_DATA_SIZE,
error_handle)) != OCI_SUCCESS)
throw_oci_error(FUN, "OCIAttrGet", result, error_handle);
if((result = OCIDefineByPos(
stmt_handle,
define_handle,
error_handle,
pos,
# ifdef _DYN
0,
-1,
#else
buf,
fetch_size,
#endif
oci_type,
ind_buf,
0,
err_buf, // ptr to array of column-level return codes
# ifdef _DYN
OCI_DYNAMIC_FETCH
# else
OCI_DEFAULT
# endif
)) != OCI_SUCCESS)
throw_oci_error(FUN, "OCIDefineByPos", result, error_handle);
# ifdef _DYN
if((result = OCIDefineDynamic(
*define_handle,
error_handle,
0,
oci_blob_callback)) != OCI_SUCCESS)
throw_oci_error(FUN, "OCIDefineByPos", result, error_handle);
# endif
return 0;
int define_columns(
OCIEnv* environment_handle,
OCISvcCtx* svc_handle,
OCIStmt* stmt_handle,
OCIError* error_handle)
static const char* FUN = "define_columns()";
define_handle_1 = 0;
int pos = 1;
::memset(ERROR_BUFFER_1, 0, 1024 * sizeof(ERROR_BUFFER_1[0]));
define_column(
environment_handle,
svc_handle,
stmt_handle,
error_handle,
&define_handle_1,
pos++,
SQLT_BLOB,
sizeof(OCILobLocator*),
FETCH_BUFFER_1,
IND_BUFFER_1,
ERROR_BUFFER_1);
return 0;
int execute_select(
const char* db,
const char* user,
const char* password)
static const char* FUN = "execute_select()";
const unsigned long FETCH_COUNT = 1024;
OCIHandlePtr<OCIError, OCI_HTYPE_ERROR> error_handle;
OCIHandlePtr<OCIServer, OCI_HTYPE_SERVER> server_handle;
OCIHandlePtr<OCISession, OCI_HTYPE_SESSION> session_handle;
OCIHandlePtr<OCISvcCtx, OCI_HTYPE_SVCCTX> svc_context_handle;
connect(
environment_handle.get(),
db,
user,
password,
error_handle,
server_handle,
session_handle,
svc_context_handle);
OCIHandlePtr<OCIStmt, OCI_HTYPE_STMT> stmt_handle;
sword result;
if((result = OCIHandleAlloc(
environment_handle.get(),
(void**)&stmt_handle.fill(),
OCI_HTYPE_STMT,
0,
0)) != OCI_SUCCESS)
throw_oci_error(FUN, "OCIHandleAlloc", result, error_handle.get());
const char QUERY[] = "SELECT text FROM ADSERVERTEST_BLOB";
ub4 rows = 0;
if((result = OCIAttrSet(
stmt_handle.get(),
OCI_HTYPE_STMT,
(dvoid *)&rows,
(ub4)sizeof(ub4),
OCI_ATTR_PREFETCH_ROWS,
error_handle.get())) != OCI_SUCCESS)
throw_oci_error(
FUN, "OCIAttrSet(OCI_ATTR_PREFETCH_ROWS)", result, error_handle.get());
if((result = OCIStmtPrepare(
stmt_handle.get(),
error_handle.get(),
(text*)QUERY,
strlen(QUERY),
OCI_NTV_SYNTAX,
OCI_DEFAULT)) != OCI_SUCCESS)
throw_oci_error(FUN, "OCIStmtPrepare", result, error_handle.get());
ub2 stmt_type;
if((result = OCIAttrGet(
stmt_handle.get(),
OCI_HTYPE_STMT,
&stmt_type,
0,
OCI_ATTR_STMT_TYPE,
error_handle.get())) != OCI_SUCCESS)
throw_oci_error(FUN, "OCIAttrGet", result, error_handle.get());
ub4 prev_fetched = 0;
while((result = OCIStmtExecute(
svc_context_handle.get(),
stmt_handle.get(),
error_handle.get(),
0,
0,
0,
0,
OCI_DEFAULT)) != OCI_SUCCESS)
if(result != OCI_STILL_EXECUTING)
throw_oci_error(FUN, "OCIStmtExecute", result, error_handle.get());
define_columns(
environment_handle.get(),
svc_context_handle.get(),
stmt_handle.get(),
error_handle.get());
ub4 all_fetched_count = 0;
while(true)
while((result = OCIStmtFetch2(
stmt_handle.get(),
error_handle.get(),
FETCH_COUNT,
OCI_FETCH_NEXT,
1,
OCI_DEFAULT)) == OCI_STILL_EXECUTING
# ifdef _DYN
// || result == OCI_NEED_DATA
# endif
if (result != OCI_SUCCESS &&
result != OCI_NO_DATA &&
result != OCI_SUCCESS_WITH_INFO)
std::cerr << FUN << ": can't make OCIStmtFetch2: status = " << result;
std::cerr << ", message = '";
text err_buf[1024] = "";
sb4 err_code = 0;
OCIErrorGet(
error_handle.get(),
(ub4)1,
0,
&err_code,
err_buf,
sizeof(err_buf),
(ub4)OCI_HTYPE_ERROR);
std::cerr << err_buf << "', error code = " << err_code << ", row errors: ";
for(const ub2* cur = ERROR_BUFFER_1;
cur < ERROR_BUFFER_1 + 1024; ++cur)
if(*cur)
std::cerr << "#" << (cur - ERROR_BUFFER_1) << ": " <<
*cur << std::endl;
ub4 fetched_count = 0;
if((result = OCIAttrGet (
stmt_handle.get(),
OCI_HTYPE_STMT,
&fetched_count,
0,
OCI_ATTR_ROW_COUNT,
error_handle.get())) != OCI_SUCCESS)
throw_oci_error(FUN, "OCIAttrGet", result, error_handle.get());
all_fetched_count += fetched_count;
if(fetched_count > 0)
for(unsigned long i = 0; i < fetched_count - 1; ++i)
ub4 lob_size;
while((result = OCILobGetLength(
svc_context_handle.get(),
error_handle.get(),
FETCH_BUFFER_1[i],
&lob_size)) == OCI_STILL_EXECUTING)
if(result != OCI_SUCCESS)
throw_oci_error(FUN, "OCILobGetLength", result, error_handle.get());
std::cout << "#" << i << ": ind = " << (unsigned long)IND_BUFFER_1[i] <<
", len = " << lob_size << std::endl;
if(fetched_count - prev_fetched < FETCH_COUNT)
break;
prev_fetched = fetched_count;
clear_blob_buf(
FETCH_BUFFER_1,
sizeof(OCILobLocator*));
while((result = OCIStmtFetch(
stmt_handle.get(),
error_handle.get(),
0,
OCI_FETCH_NEXT,
OCI_DEFAULT)) == OCI_STILL_EXECUTING
disconnect(
environment_handle.get(),
error_handle.get(),
server_handle.get(),
session_handle.get(),
svc_context_handle.get());
return 0;
int execute_update(
const char* db,
const char* user,
const char* password)
static const char* FUN = "execute_update()";
OCIHandlePtr<OCIError, OCI_HTYPE_ERROR> error_handle;
OCIHandlePtr<OCIServer, OCI_HTYPE_SERVER> server_handle;
OCIHandlePtr<OCISession, OCI_HTYPE_SESSION> session_handle;
OCIHandlePtr<OCISvcCtx, OCI_HTYPE_SVCCTX> svc_context_handle;
connect(
environment_handle.get(),
db,
user,
password,
error_handle,
server_handle,
session_handle,
svc_context_handle);
OCIHandlePtr<OCIStmt, OCI_HTYPE_STMT> stmt_handle;
for(int i = 0; i < 1000; ++i)
sword result;
if((result = OCIHandleAlloc(
environment_handle.get(),
(void**)&stmt_handle.fill(),
OCI_HTYPE_STMT,
0,
0)) != OCI_SUCCESS)
throw_oci_error(FUN, "OCIHandleAlloc", result, error_handle.get());
std::ostringstream sql;
std::string str;
std::string et("\xEB\xB2\x88");
unsigned long rep = ::rand() % 500 + 1;
str.reserve(rep*et.size());
for(unsigned long ei = 0; ei < rep; ++ei)
str.append(et);
sql << "BEGIN " <<
"UPDATE ADSERVERTEST_BLOB SET text = "
"utl_raw.cast_to_raw('" << str << "') "
"WHERE id = " << i <<
"END;";
if((result = OCIStmtPrepare(
stmt_handle.get(),
error_handle.get(),
(text*)sql.str().c_str(),
sql.str().length(),
OCI_NTV_SYNTAX,
OCI_DEFAULT)) != OCI_SUCCESS)
throw_oci_error(FUN, "OCIStmtPrepare", result, error_handle.get());
while((result = OCIStmtExecute(
svc_context_handle.get(),
stmt_handle.get(),
error_handle.get(),
1,
0,
0,
0,
OCI_DEFAULT)) != OCI_SUCCESS)
if(result != OCI_STILL_EXECUTING)
throw_oci_error(FUN, "OCIStmtExecute", result, error_handle.get());
disconnect(
environment_handle.get(),
error_handle.get(),
server_handle.get(),
session_handle.get(),
svc_context_handle.get());
return 0;
void* select_thread(void* ctx)
while(true)
execute_select(
"//oraclept.ocslab.com/addbpt.ocslab.com",
"bs_unittest_4",
"adserver");
// std::cout << "select finished" << std::endl;
return ctx;
void* update_thread(void* ctx)
while(true)
execute_update(
"//oraclept.ocslab.com/addbpt.ocslab.com",
"bs_unittest_4",
"adserver");
// std::cout << "update finished" << std::endl;
return ctx;
int main()
static const char* FUN = "main()";
sword result;
// allocate an environment handle
if((result = OCIEnvCreate(
&environment_handle.fill(),
OCI_OBJECT | OCI_THREADED,
0, // context
0, // malloc
0, // realloc
0, // free
0, // extra memory to allocate
0) // pointer to user-memory
) != OCI_SUCCESS)
throw_oci_error(FUN, "OCIEnvCreate", result, 0);
pthread_t th1, th2;
pthread_create(&th1, 0, select_thread, 0);
pthread_create(&th2, 0, update_thread, 0);
pthread_join(th1, 0);
pthread_join(th2, 0);
return 0;
Edited by: user13011391 on 20.04.2010 5:50
Edited by: user13011391 on 20.04.2010 6:00
Edited by: user13011391 on 20.04.2010 6:15 -
Non-blocking Vectored read from SocketChannel fails
Hi.
Please look at the code example:
ByteBuffer tmp1 = ByteBuffer.allocate(500);
ByteBuffer tmp2 = ByteBuffer.allocate(500);
ByteBuffer[] tmp = {tmp1, tmp2};
while ((count = socketChannel.read(tmp)) > 0) {
+ "bytes.");
When I run this code, (using non-blocking socket channel), the first buffer is read ok, but on the second round of the while loop, I get an IOException, saying: "a non blocking socket operation could not be completed immediately".
If I put 'tmp1' instead of 'tmp' in the read(), (i.e - use a normal buffer), the read successfully finishes.
Why?
I found nothing in the documentation, and in the 'Java NIO' book (Ron Hitchens).
Help?
Thanks.Please ignore the + "bytes."); inside the while.
-
Hi friends,
I have an issue to implement. We implemented a web application and now I want to separate some parts of this application. I can express the action shorter and simple below.
if a user requests x-y ticket {
���try {
������check db if x-y is available
������if true send available
������else not
���}catch (NonExistentData) {
������addJob2Queue(x-y)
������send available
���}
class AvailabilityHelper extends Thread{
���run(){
������while(true){
���������checkQueue
���������if there is job, updateDBfor(org,dest)
������}
���}
* updateDBfor(org,dest) includes other ejb references to request data and insert it into db
This web aplication runs with JSP 1.2 EL support on WAS 5.1
the check for db and the thread implementation was in a seperate package and were used in actions of web application. Now they also want to use these checks for other (non web) applications. So i think there should be a session bean in ejb and should process these requests and I used JMS (Message-Driven Bean) with WebSphere MQ to undertake the thread and queue mechanism.
Now it works like this :
class exampleSessionBean{
���getAvalibability(org, dest){
������try {
���������check db if x-y is available
���������if true send available
���������else not
������}catch (NonExistentData) {
���������queueSender.sendMessage(update x-y)
���������send available;
������}
���}
class queueMDB{
���onMessage(){
������updateDBfor(org,dest)
���}
The purpose of this applications was, not to block the user for db update process, if there is data in db select and show to the user. the update process of db includes other ejb references and takes so much time. It is nonsense to make the user wait such time. And the info is not a big deal, because of this when i put a request for update, without blocking i send it as available...
So what is the problem ? :) Deployment team don't want to pay for websphere MQ and hire a admin for that. Also they don't want to use Embedded Messaging server client (JMS Server) of WAS. So I am asking you: is there a way to implement a non blocking servlet so that i will just make a request and don't wait for response, or a servlet will take the request and release the connection but will continue to process the request ?
thanks for all...I tried to implement a web application and add a ServletContextListener as stevejluke suggests. But on contextInitialized function when creating new JobConsumer it gets following errors on server.
6/27/06 12:51:36:391 CEST] 33238138 WebContainer A SRVE0169I: Loading Web Module: non-blocking.
[6/27/06 12:51:36:438 CEST] 33238138 SystemOut O OlaListener initializing...
[6/27/06 12:51:36:516 CEST] 33238138 SystemOut O OlaListener - Queue added
[6/27/06 12:51:36:516 CEST] 33238138 SystemOut O OlaListener - keepWorking
[6/27/06 12:51:36:672 CEST] 33238138 WebApp E SRVE0015E: Failure to initialize Web application non-blocking
[6/27/06 12:51:36:844 CEST] 33238138 WebGroup E SRVE0054E: An error occurred while loading Web application
public class OlaListener implements ServletContextListener {
* @see javax.servlet.ServletContextListener#void (javax.servlet.ServletContextEvent)
public void contextDestroyed(ServletContextEvent event) {
ServletContext context = event.getServletContext();
context.setAttribute("keepWorking", Boolean.FALSE);
* @see javax.servlet.ServletContextListener#void (javax.servlet.ServletContextEvent)
public void contextInitialized(ServletContextEvent event) {
System.out.println("OlaListener initializing...");
ServletContext context = event.getServletContext();
WorkQueue newJobs = new WorkQueue();
context.setAttribute("newJobs", newJobs);
System.out.println("OlaListener - Queue added");
context.setAttribute("keepWorking", Boolean.TRUE);
System.out.println("OlaListener - keepWorking");
JobConsumer jc = new JobConsumer();
System.out.println("OlaListener - Job Consumer created");
jc.setContext(context);
System.out.println("OlaListener - context set");
Thread t = new Thread(jc);
t.start();
public class JobConsumer implements Runnable{
/*log4j*/ private static final Logger logger = Logger.getLogger(JobConsumer.class);
private ServletContext context = null;
public void run(){
System.out.println("JobConsumer - run Start");
processQueue(context);
System.out.println("JobConsumer - run End");
} -
Broken Pipe with Non-blocking Socket
Hello,
I write a Unix Agent who connect on a Windows Server with socket...
Working well on Linux but on Solaris my problem is:
-When my agent is running before server at connection all seems OK: Connect, Select and Getsockopt but when I try to send data I have always EPIPE Signal but I can receive datas from server !
- When my agent is strarting after the server all it's Ok
I don't unserstand this appears on Solaris SPARC 8 and Solaris 9 Intel ...
Please Help is there something special with non-blocking sockets on Solaris ?
ThanksCan't help you much but what I would recommend is that you
insure that your pipes are opened for both read/write, even
though you are only going to read or write from it. This insures
that the pipe does not close down when you hit EOF. -
We wish to connect fat clients (in our case Powerbuilder) to a J2EE environment (Weblogic). We also need to make some of the calls from the fat client non-blocking (asynchronous). With many clients, JMS was rejected as a mechanism.
Our first solution, which works as a prototype, was to package a Java bean as an OLE object and deploy it to the client. This bean could make the calls non-blocking. However there are registry issues (the packaging implies a pre-defined directory structure), we need a JRE on every client and 15Mb of weblogic jars (aaargh), so it only really works as a prototype.
The next (current) solution is a C dll that can be called from Powerbuilder and uses a socket to talk to a Java J2EE Gateway on the server. This Gateway makes the system non-blocking and calls the EJBs. This is clearly easier in terms of configuring the client.
Ideally we would like to drop the Gateway by finding a non-blocking way to get into J2EE from the C dll but the only methods we have thought of:
- simulating an HTTP servlet call
- SOAP
are synchronous (or appear to be, my knowledge of SOAP is limited).
Has anyone come across other ways of getting non-blocking communications with J2EE?CORBA, this is what it was designed to do, but it is not not a light weight solution.
Maybe you are looking for
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