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List:       openldap-technical
Subject:    Need information related to multi thread support in OpenLDAP c sdk client
From:       c.venugopal521 () gmail ! com
Date:       2024-04-29 7:48:44
Message-ID: 171437692444.1014223.15829176178613360536 () hypatia ! openldap ! org
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Hi Team,

We are working on migration of nsldap C sdk to OpenLDAP c sdk for our application \
client code. As part of this activity, replacing API one by one and also looking for \
constant replacement.

In NSLDAP C SDK:
/*
 * Thread function callbacks (an API extension --
 * LDAP_API_FEATURE_X_THREAD_FUNCTIONS).
 */
#define LDAP_OPT_THREAD_FN_PTRS         0x05    /* 5 - API extension */

/*
 * Thread callback functions:
 */
typedef void *(LDAP_C LDAP_CALLBACK LDAP_TF_MUTEX_ALLOC_CALLBACK)( void );
typedef void (LDAP_C LDAP_CALLBACK LDAP_TF_MUTEX_FREE_CALLBACK)( void *m );
typedef int (LDAP_C LDAP_CALLBACK LDAP_TF_MUTEX_LOCK_CALLBACK)( void *m );
typedef int (LDAP_C LDAP_CALLBACK LDAP_TF_MUTEX_UNLOCK_CALLBACK)( void *m );
typedef int (LDAP_C LDAP_CALLBACK LDAP_TF_GET_ERRNO_CALLBACK)( void );
typedef void (LDAP_C LDAP_CALLBACK LDAP_TF_SET_ERRNO_CALLBACK)( int e );
typedef int (LDAP_C LDAP_CALLBACK LDAP_TF_GET_LDERRNO_CALLBACK)(
        char **matchedp, char **errmsgp, void *arg );
typedef void    (LDAP_C LDAP_CALLBACK LDAP_TF_SET_LDERRNO_CALLBACK)( int err,
        char *matched, char *errmsg, void *arg );

/*
 * Structure to hold thread function pointers:
 */
struct ldap_thread_fns {
        LDAP_TF_MUTEX_ALLOC_CALLBACK *ltf_mutex_alloc;
        LDAP_TF_MUTEX_FREE_CALLBACK *ltf_mutex_free;
        LDAP_TF_MUTEX_LOCK_CALLBACK *ltf_mutex_lock;
        LDAP_TF_MUTEX_UNLOCK_CALLBACK *ltf_mutex_unlock;
        LDAP_TF_GET_ERRNO_CALLBACK *ltf_get_errno;
        LDAP_TF_SET_ERRNO_CALLBACK *ltf_set_errno;
        LDAP_TF_GET_LDERRNO_CALLBACK *ltf_get_lderrno;
        LDAP_TF_SET_LDERRNO_CALLBACK *ltf_set_lderrno;
        void    *ltf_lderrno_arg;
};
nsldap c sdk has thread function pointers option to support multi thread \
functionality for client programs. In our existing code, we are using \
'LDAP_OPT_THREAD_FN_PTRS' option with ldap_set_option API like "Client code usage: \
ldap_set_option(hLDAP, LDAP_OPT_THREAD_FN_PTRS, &tfns);".

Now, we are looking for similar functionality with in OpenLDAP to use it in our \
client program. Gone through OpenLDAP document and source code, but with my \
knowledge, did not get any equivalent one.

Could you please provide more details on this to achieve equivalent functionality of \
LDAP_OPT_THREAD_FN_PTRS with OpenLDAP?

Thank you
Venu


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