Follow-up Comment #1, bug #48930 (project hurd):
I tried implementing (b) using pthread_rwlock_t. It took about 15 lines of
code. However, I noticed two more problems along the way:
1. --core-file-name can be set via fsysopts but it cannot be unset via
fsysopts. Fixing this would require designing a command-line option for that
purpose, or perhaps --core-file-name= with an empty template should unset it.
2. If --core-file-name is set via fsysopts, and its argument is not a valid
template, then the crash server exits. It should instead return an error to
the fsys_set_options RPC, like --action=GARBAGE does. This is simply a bug
and can be fixed without further design.
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