SNAP or SNAPX SDUMP or SDUMPX macro - is type 4, gets LOCAL, CMS, CMSEQDQ, DISP, VSMPAGE, VSMFIX, CPU, and SALLOC locks (see also the SNAP, SNAPX, SDUMP, OR SDUMPX control block in z/OS® MVS™ Data Areas in http://www.ibm.com/systems/z/os/zos/bkserv/).
Calls module IEAVAD00.