Re: [fuse-devel] threads, processes in fuse in c

[Allen P. <pul...@co...>]

> As I am considering writing something whose actions can take
> a long time (and block), I am curious to know how this would 
> work if two processes (for example) each attempt to perform 
> different actions. Will they occur in parallel?

In general, they happen in parallel.  But sometimes FUSE itself (at least
the high level interface) acquires a mutex, forcing two operations to occur
in sequence.  It is not straightforward to figure out which operations will
block which other operations, and which will occur in parallel.

> A more strange question: suppose I spawn threads before
> calling fuse_main -- can the functions such as getattr, etc. 
> communicate with the other threads?

Yes.  FYI, threads spawned before calling fuse_main are killed when
fuse_main calls the daemon() system function.  So you need to spawn threads
in your file system's init() function which fuse_main calls after calling
daemon().