Atomically subtracts a 64-bit value from the 64-bit value in the specified memory location.
#include <stdlib.h> void atomic64_sub ( uint64_t *addr, uint64_t value);
(IN) Points to the memory location for the operation.
(IN) Specifies the value to subtract.
The memory location address is expected to be valid. If an invalid address is passed, the server will abend.