The MM library is a 2-layer abstraction library that simplifies the
usage of shared memory between forked (and this way strongly related)
processes under Unix platforms. On the first layer, it hides all
platform-dependent implementation details (allocation and locking) when
dealing with shared memory segments and on the second layer it provides
a high-level malloc(3)-style API for a convenient and well-known way to
work with data structures inside those shared memory segments.