Introduce a global mutex, ipxpcb_list_mtx, to protect the global

IPX PCB lists.  Add macros to initialize, destroy, lock, unlock,
and assert the mutex.  Initialize the mutex when IPX is started.

Add per-IPX PCB mutexes, ipxp_mtx in struct ipxpcb, to protect
per-PCB IPX/SPX state.  Add macros to initialize, destroy, lock,
unlock, and assert the mutex.  Initialize the mutex when a new
PCB is allocated; destroy it when the PCB is free'd.

MFC after:	2 weeks

1 files changed, 3 insertions, 0 deletions

diff --git a/sys/netipx/ipx_input.c b/sys/netipx/ipx_input.c
index 596b275..0e8f75e 100644
--- a/sys/netipx/ipx_input.c
+++ b/sys/netipx/ipx_input.c
@@ -88,6 +88,7 @@ struct	sockaddr_ipx ipx_netmask, ipx_hostmask;
 /*
  * IPX protocol control block (pcb) lists.
  */
+struct mtx		ipxpcb_list_mtx;
 struct ipxpcbhead	ipxpcb_list;
 struct ipxpcbhead	ipxrawpcb_list;
 
@@ -114,6 +115,8 @@ ipx_init()
 	LIST_INIT(&ipxpcb_list);
 	LIST_INIT(&ipxrawpcb_list);
 
+	IPX_LIST_LOCK_INIT();
+
 	ipx_netmask.sipx_len = 6;
 	ipx_netmask.sipx_addr.x_net = ipx_broadnet;