[gnutls-devel] GnuTLS | gnutls_x509_trust_list_t should be safely shared among multiple threads (#1212)

[Read-only notification of GnuTLS library development activities]

Daiki Ueno created an issue: https://gitlab.com/gnutls/gnutls/-/issues/1212



The documentation about currently says:
```
The GnuTLS library is thread safe by design, meaning that objects of the
library such as TLS sessions, can be safely divided across threads as
long as a single thread accesses a single object.  This is sufficient to
support a server which handles several sessions per thread.  Read-only
access to objects, for example the credentials holding structures, is
also thread-safe.
```
The last statement implies that the read-only usage of `gnutls_x509_trust_list_t`, such as for verifying certificate chain with already populated list, should be performed from multiple threads against the single `gnutls_x509_trust_list_t` object. This is apparently not true with the use with PKCS#11 trust store:
https://bugzilla.redhat.com/show_bug.cgi?id=1937513#c33

We should either document this as an exception or actually make it thread safe.

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