Due to the C++ bindings not being thread-safe, I was hoping to turn off thread-safety in the C core
and handle synchronization in my code. This turned out to be impossible because the HDF5 core uses
global, non-thread-specific data structures when H5_HAVE_THREADSAFE is
undefined. There does not
appear to be a way to turn off internal synchronization while keeping thread or
instance specific
data structures. That would be useful. SQLite has good semantics for thread
safety:
http://www.sqlite.org/compile.html#threadsafe
This option controls whether or not code is included in SQLite to enable it to
operate safely in
a multithreaded environment. The default is SQLITE_THREADSAFE=1 which is safe
for use in a
multithreaded environment. When compiled with SQLITE_THREADSAFE=0 all mutexing
code is omitted
and it is unsafe to use SQLite in a multithreaded program. When compiled with
SQLITE_THREADSAFE=2, SQLite can be used in a multithreaded program so long as
no two threads
attempt to use the same database connection at the same time.
At the very least it would be useful if the documentation specifies that H5_HAVE_THREADSAFE controls
both the use of global data structures and synchronization. I had to dig into the code to understand it.
Thanks,
-Matt
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