While trying to setup an OpenSC context, the global_locking
and detect cards, it is possible that multiple threads may
call C_Initialize. The current code tries to prevent this using
"if (context == NULL)" but this is not a mutex, and
multiple threads may endup overwrite contexts and global locking and
cause additional problems, with pcsc and segfault.
FireFox appears to do this see #2032
The PR adds a mutex or Critical section to make sure only one
thread creates the context sets the global_locking and does
the initial detect cards, etc.
This allows the global_lock (if requested) to be setup
which is then used for other calls.
All but the first call to C_Initialize will return with CKR_OK,
others will return CKR_CRYPTOKI_ALREADY_INITIALIZED.
Date: Mon Jan 11 12:47:12 2021 -0600
Changes to be committed:
modified: src/pkcs11/pkcs11-global.c
1b4e9f1d4a