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flip_generations needs to make sure it is not throwing away a list of
objects to be released.
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Our variants print stack traces on failures. This will make locating
errors much easier.
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* NEWS: Mention protected payloads.
* libports/Makefile (SRCS): Add `port-deref-deferred.c'.
* libports/create-internal.c (_ports_create_port_internal): Set the
protected payload to the objects address.
* libports/import-port.c (ports_import_port): Likewise.
* libports/reallocate-from-external.c (ports_reallocate_from_external):
Likewise.
* libports/reallocate-port.c (ports_reallocate_port): Likewise.
* libports/transfer-right.c (ports_transfer_right): Likewise.
* libports/manage-multithread.c (ports_manage_port_operations_multithread):
Use the protected payload for the object lookup if provided. Add
thread pool management calls.
* libports/manage-one-thread.c (ports_manage_port_operations_one_thread):
Likewise.
* libports/destroy-right.c (ports_destroy_right): Defer the
dereferencing of outstanding send rights to avoid a port_info
use-after-free.
* libports/port-deref-deferred.c: New file.
* libports/port-deref-deferred.h: Likewise.
* libports/ports.h (struct port_bucket): New field `threadpool'.
(ports_lookup_payload): Check `port_right'.
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