[gnutls-devel] GnuTLS | pkcs11: try to initialize modules in thread-safe mode (!2014)

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Daiki Ueno created a merge request: https://gitlab.com/gnutls/gnutls/-/merge_requests/2014

Project:Branches: dueno/gnutls:wip/dueno/trust-list to gnutls/gnutls:master
Author:   Daiki Ueno




<!-- Add a description of the new feature/bug fix. Reference any relevant bugs. -->

When modules are initialized without CKF_OS_LOCKING_OK nor custom
locking functions, they may skip their internal locking assuming that
the applications will take care of thread-safety, which is costly and
GnuTLS currently doesn't do that.

To mitigate this, this patch changes the module initialization code to
tell the modules to guarantee thread-safety by themselves. If they are
unable to do that, this falls back to the normal initialization
without C_Initialize parameters. This also omits the custom_init flag,
which indicated whether the module is initialized with
p11_kit_module_initialize or a direct call to C_Initialize, now that
modules are always initialized with C_Initialize.

Fixes: #1212

## Checklist
 * [x] Commits have `Signed-off-by:` with name/author being identical to the commit author
 * [ ] Code modified for feature
 * [ ] Test suite updated with functionality tests
 * [ ] Test suite updated with negative tests
 * [ ] Documentation updated / NEWS entry present (for non-trivial changes)

## Reviewer's checklist:
 * [ ] Any issues marked for closing are addressed
 * [ ] There is a test suite reasonably covering new functionality or modifications
 * [ ] Function naming, parameters, return values, types, etc., are consistent and according to `CONTRIBUTION.md`
 * [ ] This feature/change has adequate documentation added
 * [ ] No obvious mistakes in the code

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