BOOL CheckForGarbage ( Slot_Mgr_Shr_t *MemPtr ) {
int SlotIndex;
int ProcIndex;
int Err;
BOOL ValidPid;
ASSERT( MemPtr != NULL_PTR );
#ifdef DEV
DbgLog(DL5, "Thread %d is checking for garbage", pthread_self());
#endif /* DEV */
#ifdef DEV
DbgLog (DL5, "Garbage collection attempting global shared memory lock");
#endif /* DEV */
/* Grab the global Shared mem mutex since we might modify global_session_count */
#ifdef PKCS64
Err = msem_lock(&(MemPtr->slt_mutex),0);
#else
Err = pthread_mutex_lock ( &(MemPtr->slt_mutex) );
#endif
if ( Err != 0 ) {
DbgLog (DL0, "Garbage collection: Locking attempt for global shmem mutex returned %s", SysConst(Err) );
return FALSE;
}
#ifdef DEV
DbgLog ( DL5, "Garbage collection: Got global shared memory lock");
#endif /* DEV */
for ( ProcIndex = 0; ProcIndex < NUMBER_PROCESSES_ALLOWED; ProcIndex++ ) {
#ifdef PKCS64
Slot_Mgr_Proc_t_64 *pProc = &(MemPtr->proc_table[ProcIndex]);
#else
Slot_Mgr_Proc_t *pProc = &(MemPtr->proc_table[ProcIndex]);
#endif
ASSERT(pProc != NULL_PTR);
if ( ! (pProc->inuse) ) {
continue;
}
ValidPid = ( (IsValidProcessEntry ( pProc->proc_id, pProc->reg_time )) && (pProc->proc_id != 0) );
if ( ( pProc->inuse ) && (! ValidPid ) ) {
#ifdef DEV
DbgLog(DL1, "Garbage collection routine found bad entry for pid %d (Index: %d); removing from table", pProc->proc_id, ProcIndex );
#endif /* DEV */
/* */
/* Clean up session counts */
/* */
for ( SlotIndex = 0; SlotIndex < NUMBER_SLOTS_MANAGED; SlotIndex++ ) {
#ifdef PKCS64
unsigned int *pGlobalSessions = &(MemPtr->slot_info[SlotIndex].global_sessions);
unsigned int *pProcSessions = &(pProc->slot_session_count[SlotIndex]);
#else
int *pGlobalSessions = &(MemPtr->slot_info[SlotIndex].global_sessions);
int *pProcSessions = &(pProc->slot_session_count[SlotIndex]);
#endif
if ( *pProcSessions > 0 ) {
#ifdef DEV
DbgLog ( DL2, "GC: Invalid pid (%d) is holding %d sessions open on slot %d. Global session count for this slot is %d", pProc->proc_id, *pProcSessions, SlotIndex, *pGlobalSessions );
#endif /* DEV */
if ( *pProcSessions > *pGlobalSessions ) {
#ifdef DEV
WarnLog ( "Garbage Collection: Illegal values in table for defunct process");
DbgLog ( DL0, "Garbage collection: A process ( Index: %d, pid: %d ) showed %d sessions open on slot %s, but the global count for this slot is only %d",
ProcIndex, pProc->proc_id, *pProcSessions, SlotIndex, *pGlobalSessions );
#endif /* DEV */
*pGlobalSessions = 0;
} else {
*pGlobalSessions -= *pProcSessions;
}
*pProcSessions = 0;
} /* end if *pProcSessions */
} /* end for SlotIndex */
/* */
/* NULL out everything except the mutex */
/* */
#if PER_PROCESS_MUTEXES
/* Grab the mutex for this proc's shared memory data structure */
#ifdef PKCS64
Err = msem_lock(&(pProc->proc_mutex),MSEM_IF_NOWAIT);
#else
Err = pthread_mutex_trylock( &(pProc->proc_mutex) );
#endif
if ( ( Err != 0 ) ) {
/* We didn't get the lock! */
/* Attempting to destroy a locked mutex results in undefined behavior */
/* http://techlib.austin.ibm.com/techlib/manuals/adoclib/libs/basetrf1/pthreads.htm */
DbgLog (DL0,"Unable to get per-process mutex for pid %d (%s) - skipping", pProc->proc_id, SysConst( Err ) );
/*
The exit routine will figure out that this is an invalid process entry
(by calling IsValidProcessEntry()), and won't prevent the slotd from exiting
because of this entry.
*/
continue;
}
#endif /* PER_PROCESS_MUTEXES */
memset( &(pProc->inuse), '\0', sizeof(pProc->inuse) );
memset( &(pProc->proc_id), '\0', sizeof(pProc->proc_id) );
memset( &(pProc->slotmap), '\0', sizeof(pProc->slotmap) );
memset( &(pProc->blocking), '\0', sizeof(pProc->blocking ));
memset( &(pProc->error), '\0', sizeof(pProc->error) );
memset( &(pProc->slot_session_count), '\0', sizeof(pProc->slot_session_count) );
memset( &(pProc->reg_time), '\0', sizeof(pProc->reg_time) );
} /* end if inuse && ValidPid */
#if PER_PROCESS_MUTEXES
#ifdef PKCS64
msem_unlock(&(pProc->proc_mutex),0)
#else
pthread_mutex_unlock( &(pProc->proc_mutex));
#endif
#endif /* PER_PROCESS_MUTEXES */
} /* end for ProcIndex */
#ifdef PKCS64
msem_unlock(&(MemPtr->slt_mutex),0);
#else
pthread_mutex_unlock ( &(MemPtr->slt_mutex) );
#endif
DbgLog ( DL5, "Garbage collection: Released global shared memory lock");
return TRUE;
}
BOOL CheckForGarbage ( Slot_Mgr_Shr_t *MemPtr ) {
int SlotIndex;
int ProcIndex;
int Err;
BOOL ValidPid;
ASSERT( MemPtr != NULL_PTR );
#ifdef DEV
DbgLog(DL5, "Thread %d is checking for garbage", pthread_self());
#endif /* DEV */
#ifdef DEV
DbgLog (DL5, "Garbage collection attempting global shared memory lock");
#endif /* DEV */
/* Grab the global Shared mem mutex since we might modify global_session_count */
Err = XProcLock();
if ( Err != TRUE ) {
DbgLog (DL0, "Garbage collection: Locking attempt for global shmem mutex returned %s", SysConst(Err) );
return FALSE;
}
#ifdef DEV
DbgLog ( DL5, "Garbage collection: Got global shared memory lock");
#endif /* DEV */
for ( ProcIndex = 0; ProcIndex < NUMBER_PROCESSES_ALLOWED; ProcIndex++ ) {
Slot_Mgr_Proc_t_64 *pProc = &(MemPtr->proc_table[ProcIndex]);
ASSERT(pProc != NULL_PTR);
if ( ! (pProc->inuse) ) {
continue;
}
ValidPid = ( (IsValidProcessEntry ( pProc->proc_id, pProc->reg_time )) && (pProc->proc_id != 0) );
if ( ( pProc->inuse ) && (! ValidPid ) ) {
#ifdef DEV
DbgLog(DL1, "Garbage collection routine found bad entry for pid %d (Index: %d); removing from table", pProc->proc_id, ProcIndex );
#endif /* DEV */
/* */
/* Clean up session counts */
/* */
for ( SlotIndex = 0; SlotIndex < NUMBER_SLOTS_MANAGED; SlotIndex++ ) {
unsigned int *pGlobalSessions =
&(MemPtr->slot_global_sessions[SlotIndex]);
unsigned int *pProcSessions = &(pProc->slot_session_count[SlotIndex]);
if ( *pProcSessions > 0 ) {
#ifdef DEV
DbgLog ( DL2, "GC: Invalid pid (%d) is holding %d sessions open on slot %d. Global session count for this slot is %d", pProc->proc_id, *pProcSessions, SlotIndex, *pGlobalSessions );
#endif /* DEV */
if ( *pProcSessions > *pGlobalSessions ) {
#ifdef DEV
WarnLog ( "Garbage Collection: Illegal values in table for defunct process");
DbgLog ( DL0, "Garbage collection: A process ( Index: %d, pid: %d ) showed %d sessions open on slot %s, but the global count for this slot is only %d",
ProcIndex, pProc->proc_id, *pProcSessions, SlotIndex, *pGlobalSessions );
#endif /* DEV */
*pGlobalSessions = 0;
} else {
*pGlobalSessions -= *pProcSessions;
}
*pProcSessions = 0;
} /* end if *pProcSessions */
} /* end for SlotIndex */
/* */
/* NULL out everything except the mutex */
/* */
memset( &(pProc->inuse), '\0', sizeof(pProc->inuse) );
memset( &(pProc->proc_id), '\0', sizeof(pProc->proc_id) );
memset( &(pProc->slotmap), '\0', sizeof(pProc->slotmap) );
memset( &(pProc->blocking), '\0', sizeof(pProc->blocking ));
memset( &(pProc->error), '\0', sizeof(pProc->error) );
memset( &(pProc->slot_session_count), '\0', sizeof(pProc->slot_session_count) );
memset( &(pProc->reg_time), '\0', sizeof(pProc->reg_time) );
} /* end if inuse && ValidPid */
} /* end for ProcIndex */
XProcUnLock();
DbgLog ( DL5, "Garbage collection: Released global shared memory lock");
return TRUE;
}
