c# - How Marshal.FreeHGlobal can free unmanned array? -

i have reserved unmanned array using:

intptr ptr = marshal.allochglobal(marshal.sizeof(array[0]) * array.length); 

then free using:

marshal.freehglobal(ptr ); 

as far read, free memory correctly , no memory leak gonna happen. question: true? if is, how works? marshal state-full , store meta-data every reserved data?

the allochglobal method exposes localalloc function. , freehglobal method exposes localfree function. memory management not being done managed component. done code behind these windows api functions.

to answer question: yes has keep track of allocated size. can retrieve size of handle calling localsize function. honest, don't know how being done internally, don't need know that.