Signal Handling Issue with OCI

Question

Greetings.
I have a library using OCI with Oracle 10g.
I am not doing any signal handling inside the library.
I have realized after a connection is made to Oracle 10g server and successfully terminated, the ctrl+Z signal (SIGTSTP) would not be honored. If I use the same library and make no connection to database, then the signal is honored. Other signals such as SIGINT etc are OK even if I make connections to database server.
Operations that I do using OCI are simple:
1- initialization of context (standard env creation, set attributes, handle allocation etc)
2- making connection
3- inserting using SQL insert method (statement prep, defineByPos, execute)
4- simple selection of last value of a sequence (statement prep, defineByPos, execute)
5- clean up (OCISessionEnd, OCIServerDetach,and freeing handles)
Again, I have no signal handling inside the library. I am using this over Solaris OS and the functionality is correct except for this signal issue.
My questions:
1- Is this a known issue or is this something that has been seen before?
2- what sort of signal handling is in OCI that could potentially impact my app?
3- Is there any solution that you could suggest?
thank you in advance.

Answer 1

I'm trying to migrate from oracle 9i HP unix to oracle 10G AIX5.3
I'm trying to create a connection pool. Then create Many threads, with each of these
performing an OCI Session Get at thread initialization.
Then handing the threads work to perform on their existing OCI session to the connectionpool.
Same thing was working fine in oracle 9i but if I try to do the same in oracle 10G seems to get locked up,
unless the sessionget/sessionrelease are in the same working
thread subroutine. I am trying to avoid getting a session and releasing for each unit of
work.Instead I'd like to acquire a bunch of session against the connection pool.And then have the threads (with persistent sessions) perform periodic work....
If utilizing a get/work/release all in the same thread and subroutine call.Then everything works, except performance is very poor.
please find the function I'm using to achive the same.
Experts please help me ,I'm totally struck here....
int ConnectionOpen (Connection conn, char username, char password, char server) {
** Functionality : Opens a new session with Oracle.
** Parameters : conn - pointer to the struct Connection. It is an output parameter
** returns the handle to the new session.
** username - pointer to the char array has username.
** password - pointer to the char array has password.
** server - pointer to the char array has database name.
** Returns 0 on success, 1 on success with information and non-zero value on error.
int status = 0;
boolean sesfnd;
text errbuf[512];
sb4 errcode = 0;
if (!conn) return OCI_INVALID_HANDLE;
if (!strcasecmp (USE_SESS_POOL, "YES"))
/* PLC44050021 Session Pool Changes*/
if (conopen==0)
status = OCIEnvCreate((OCIEnv **) &envhp, OCI_THREADED,
(dvoid *)0, (dvoid *(*)(dvoid *, size_t))0,
(dvoid *(*)(dvoid *, dvoid *, size_t))0, (void (*)(dvoid *, dvoid *))0,
(size_t)0, (dvoid**)0);
if (status != 0 && status != 1) return status; /*error in creating environment*/
status = OCIHandleAlloc((dvoid *)envhp,
(dvoid **)&errhp,
OCI_HTYPE_ERROR,
(size_t)0,
(dvoid **)0);
if ( status != 0 && status != 1 ) return status; /*error in allocating error handler*/
status = OCIHandleAlloc((dvoid *)envhp,
(dvoid **)&authp,
OCI_HTYPE_AUTHINFO,
(size_t)0,
(dvoid **)0);
if ( status != 0 && status != 1 ) return status; /*error in allocating error handler*/
status = OCIHandleAlloc((dvoid *)envhp,
(dvoid **) &poolhp,
OCI_HTYPE_SPOOL,
(size_t)0,
(dvoid **)0);
if ( status != 0 && status != 1 ) return status; /*error in allocating CPOOL Handler*/
status = OCISessionPoolCreate((OCIEnv*)envhp,
(OCIError*)errhp,poolhp,
&poolName, (ub4*)&poolNameLen,
(text*)server, (ub4)strlen(server),
sessMin, sessMax, sessIncr,
(text*)username, (ub4)strlen(username),
(text*)password, (ub4)strlen(password),
OCI_DEFAULT) ;
if ( status != 0 && status != 1 ) return status;
conn->envhp=(OCIEnv*)envhp;
conn->errhp=(OCIError*)errhp;
status=OCIAttrSet((dvoid *)authp,(ub4) OCI_HTYPE_AUTHINFO,
(text*)username, (ub4)strlen(username),
(ub4) OCI_ATTR_USERNAME, (OCIError*)conn->errhp);
if ( status != 0 && status != 1 ) return status;
status=OCIAttrSet((dvoid *) authp,(ub4) OCI_HTYPE_AUTHINFO,
(text*)password, (ub4)strlen(password),
(ub4) OCI_ATTR_PASSWORD, (OCIError*)conn->errhp);
if ( status != 0 && status != 1 ) return status;
status = OCISessionGet((OCIEnv*)conn->envhp,
(OCIError*)conn->errhp,
(OCISvcCtx**)&(conn->svchp),
authp,
(OraText *)poolName, (ub4)strlen((char*)poolName),
(OraText *)"", (ub4)0,
NULL, NULL,
0,
OCI_SESSGET_SPOOL);
if ( status != 0 && status != 1 ) return status;
conopen=1;
/******* if the session pool is already established, reuse sessions out of it ********** /
else
conn->errhp=(OCIError*)errhp;
conn->envhp=(OCIEnv*)envhp;
          /******* Hanging in this call ********** /
status = OCISessionGet((OCIEnv*)conn->envhp,
(OCIError*)conn->errhp,
(OCISvcCtx**)&(conn->svchp),
authp,
(OraText *)poolName, (ub4)strlen((char*)poolName),
(OraText *)"", (ub4)0,
NULL, NULL,
0,
OCI_SESSGET_SPOOL);
if ( status != 0 && status != 1 ) return status;
else
status = OCIEnvCreate((OCIEnv **) &conn->envhp, (ub4)OCI_DEFAULT,
(dvoid *)0, (dvoid *(*)(dvoid *, size_t))0,
(dvoid *(*)(dvoid *, dvoid *, size_t))0, (void (*)(dvoid *, dvoid *))0,
(size_t)0, (dvoid**)0);
if (status != 0 && status != 1) return status; /*error in creating environment*/
status = OCIHandleAlloc((dvoid *)conn->envhp, (dvoid **)&conn->errhp, OCI_HTYPE_ERROR, (size_t)0, (dvoid **)0);
if ( status != 0 && status != 1 ) return status; /*error in allocating error handler*/
status = OCILogon((OCIEnv*)conn->envhp, (OCIError*)conn->errhp, (OCISvcCtx**)&(conn->svchp),
(text*)username, (ub4)strlen(username),
(text*)password, (ub4)strlen(password),
(text*)server, (ub4)strlen(server));
return status;
}