about source code

[Yao HEALTH]

Hello,
 
In Socket.c, there are many "manager->nevents" 
for an example, manager->nevents = ISC_SOCKET_MAXEVENTS; 
 
but the manager is defined in "isc_socketmgr_t *manager "
 
typedef struct isc_socketmgr isc_socketmgr_t; /*%< Socket Manager */ 
 
struct isc_socketmgr {
/* Not locked. */
unsigned int magic;
isc_mem_t        *mctx;
isc_mutex_t lock;
/* Locked by manager lock. */
ISC_LIST(isc_socket_t) socklist;
isc_boolean_t bShutdown;
isc_condition_t shutdown_ok;
HANDLE hIoCompletionPort;
int maxIOCPThreads;
HANDLE hIOCPThreads[MAX_IOCPTHREADS];
DWORD dwIOCPThreadIds[MAX_IOCPTHREADS];
 
/*
 * Debugging.
 * Modified by InterlockedIncrement() and InterlockedDecrement()
 */
LONG totalSockets;
LONG iocp_total;
};
 
my question is that there seems no definition of "nevents" in the struct of isc_socketmgr, where is "nevents"  when we use "manager->nevents"?
 
Can some expert kindly help where I miss?
 
thanks a lot.
 
Jiankang Yao