Dear Sir
First opensession
slot->sessionIDCount=1
slot->index=2
sessionID=?(0x02000002)
pk11queue_add(session,
sessionID=0x02000002,slot->head,slot->sessHashSize=32);
{ int tmp = pk11_hash(id,hash_size); \
session->next = slot->head[2]; \
session->prev = NULL; \
if (slot->head[2]) slot->head[2]->prev = session; \
slot->head[2] = session; }
result:
sessionID=0x02000002;
session->next=NULL;
session->prev=NULL;
slot->head[2]=session;
Second opensession
sessionID=?(0x02000003)
pk11queue_add(session,
sessionID=0x02000003,slot->head,slot->sessHashSize=32);
{ int tmp = pk11_hash(id,hash_size); \
session->next = slot->head[3]; \
session->prev = NULL; \
if (slot->head[3]) slot->head[3]->prev = session; \
slot->head[3] = session; }
result:
sessionID=0x02000002;
session->next=NULL;
session->prev=NULL;
slot->head[3]=session;
my question:
1 Does it seem to be working as intended in the examples my gave above?
2 if yes. can you tell me what is the relation slot->head between
session?
3 I read the sourcecode in fortpk11.c. The following figure describes
the realton .
> look at the programm in the pkcs11.h
>
> suppose:
>
> First opensession
> slot->sessionIDCount=1
> slot->index=2
>
> [sessionID = (PR_AtomicIncrement(&slot->sessionIDCount) & 0xffffff)
> | (slot->index << 24);]
> sessionID=?(0x02000002)
>
> Second opensession
>
> sessionID=?(0x02000003)
>
>
>
>
> /* NSC_OpenSession opens a session between an application and a token. */
> CK_RV NSC_OpenSession(CK_SLOT_ID slotID, CK_FLAGS flags,
> CK_VOID_PTR pApplication,CK_NOTIFY Notify,CK_SESSION_HANDLE_PTR
> phSession)
> {
> PK11Slot *slot;
> CK_SESSION_HANDLE sessionID;
> PK11Session *session;
> PK11Session *sameID;
>
> slot = pk11_SlotFromID(slotID);
> if (slot == NULL) return CKR_SLOT_ID_INVALID;
>
> /* new session (we only have serial sessions) */
> session = pk11_NewSession(slotID, Notify, pApplication,
> flags | CKF_SERIAL_SESSION);
> if (session == NULL) return CKR_HOST_MEMORY;
>
> PK11_USE_THREADS(PZ_Lock(slot->slotLock);)
> if (slot->readOnly && (flags & CKF_RW_SESSION)) {
> /* NETSCAPE_SLOT_ID is Read ONLY */
> session->info.flags &= ~CKF_RW_SESSION;
> }
> slot->sessionCount++;
> if (session->info.flags & CKF_RW_SESSION) {
> slot->rwSessionCount++;
> }
> PK11_USE_THREADS(PZ_Unlock(slot->slotLock);)
>
> do {
> do {
> sessionID = (PR_AtomicIncrement(&slot->sessionIDCount) &
> 0xffffff)
> | (slot->index << 24);
> } while (sessionID == CK_INVALID_HANDLE);
> PK11_USE_THREADS(PZ_Lock(PK11_SESSION_LOCK(slot,sessionID));)
> pk11queue_find(sameID, sessionID, slot->head, slot->sessHashSize);
> if (sameID == NULL) {
> session->handle = sessionID;
> pk11_update_state(slot, session);
> pk11queue_add(session, sessionID,
> slot->head,slot->sessHashSize);
> } else {
> slot->sessionIDConflict++; /* for debugging */
> }
> PK11_USE_THREADS(PZ_Unlock(PK11_SESSION_LOCK(slot,sessionID));)
> } while (sameID != NULL);
>
> *phSession = sessionID;
> return CKR_OK;
> }
>
>
>
> /* queueing helper macros */
> #define pk11_hash(value,size) ((value) & (size-1))/*size must be a power
of
> 2*/
> #define pk11queue_add(element,id,head,hash_size) \
> { int tmp = pk11_hash(id,hash_size); \
> (element)->next = (head)[tmp]; \
> (element)->prev = NULL; \
> if ((head)[tmp]) (head)[tmp]->prev = (element); \
> (head)[tmp] = (element); }
> #define pk11queue_find(element,id,head,hash_size) \
> for( (element) = (head)[pk11_hash(id,hash_size)]; (element) != NULL; \
> (element) = (element)->next) { \
> if ((element)->handle == (id)) { break; } }
> #define pk11queue_is_queued(element,id,head,hash_size) \
> ( ((element)->next) || ((element)->prev) || \
> ((head)[pk11_hash(id,hash_size)] == (element)) )
> #define pk11queue_delete(element,id,head,hash_size) \
> if ((element)->next) (element)->next->prev = (element)->prev; \
> if ((element)->prev) (element)->prev->next = (element)->next; \
> else (head)[pk11_hash(id,hash_size)] = ((element)->next); \
> (element)->next = NULL; \
> (element)->prev = NULL; \
>
>
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end
