fork question

if i use fork in my userland app, how do share a global variables between
the parent and all the children? I need to have this variable created such
that if anyone (parent or child) changes it all the other children and the
parent can see the change. My only idea is a mmap'd space, I could let each
process mmap the same space and use it for various shared variables, kind
of like this:
parent: create typedef of layout of mapped space
parent: sp=mmap new shared space based on size of layout
parent: sp->var1 = value
parent: sp->var2 = value
child1: sp=mmap existing shared space
child1: sp->var1 = value
child1: if(sp->var2 == value)...
child2: sp=mmap existing shared space
child2: sp->var1 = value
child2: if(sp->var2 == value)...
Is there another better way?
Thanks
Eric
.

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