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This module didn't have any functionality that we actually used yet, and
it was quite small.
Tevent is quite low level and perhaps doesn't make much sense to expose
directly as a Python module. It was also causing build problems when used with a
system-tevent. We can always back later if necessary.
- Create separate macros for lock and unlock so that it's easier to identify
which request is being made.
- Initialize *ponce in the SMB_THREAD_ONCE macro in the non-thread-safe case,
rather than requiring each init function to determine if it's in the
non-thread-safe case and manually initialize.
Derrell
- This should make life easier for ourselves. We're no longer constrained to
the semantics of pthread_once, so let's allow passing a parameter to the
initialization function. Some of Samba's init functions return a
value. Although I haven't searched, I suspect that some of the init
functions require in input parameters. The parameter added here can be used
for input, output, or both, as necessary... or ignored, as is now done in
talloc_stackframe_init().
Derrell
- It would help if smb_thread_once did, eventually, set the variable that
prevents the init function from being run again. Sigh. It must be getting
late.
Derrell
- We can't set *ponce=true before running the function because although other
threads wouldn't re-run the initialization function, they could potentially
proceed beyond the initialization point while the first thread was still
running the initialization function. If a second thread gets to an
SMB_THREAD_ONCE() call while one with the same ponce is running, we need to
ensure that it enters smb_thread_once() to await the mutex and then recheck
whether *ponce is set or not. My original comment about other "once"
functions possibly being called from within this "once" function is
irrelevant since those other ones would have their own unique ponce.
Derrell
- Internally, when locking or unlocking a mutex, we'll pass one of the
values of enum smb_thread_lock_type. That enum is not available to users
providing a thread implementation. Externally, we'll document the integer
values which will be passed to their lock_mutex function, but not require
them to access our internal header file.
Derrell
Jeremy, please check...
- I'm in the process of providing an interface in libsmbclient to the
recently-added threading capabilities. In the process, I discovered that
different thread implementations have varying types for the variable passed
to the thread_impl_once() function. pthreads, for example, uses type
pthread_once_t. Since Samba needs to internally declare these variables, it
would need to know the exact type required by each thread implementation's
function. After considering multiple methods of obtaining an appropriately
sized variable, I decided that for the basic "once" functionality required
by Samba, it would be much simpler to just implement our own "once"
functionality. We don't require cancellation points et all. This commit adds
an smb_thread_once() function that is implemented using an internal
mutex. The mutex itself uses the implementation's create_mutex
function. This eliminates the need for the user to provide a smb_thread_once
function pointer and the entire issue of that function's first parameter.
Derrell
libreplace makes use of an older form of AC_CHECK_TYPE which basically
provides a fallback definition for the type if it isn't available.
http://www.gnu.org/software/hello/manual/autoconf/Obsolete-Macros.html#Obsolete-Macros
shows why this isn't a good idea (its not so important, except for pointer types).
This patch partly addresses the issue.
Signed-off-by: Jelmer Vernooij <jelmer@samba.org>
available. This means it's possible to compile libreplace when these
functions are not available and use it, as long as this particular
function is not used.
