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core: equip signal-context slab with initial block

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By supplying a statically allocated initial block to the slab allocator
for signal contexts, we become able to construct a 'Signal_broker' (the
back end for the PD's signalling API) without any dynamic memory
allocation. This is a precondition for using the PD as meta-data
allocator for its contained signal broker (meta data allocations must
not happen before the PD construction is complete).

Issue #2407
This commit is contained in:
Norman Feske
2017-05-11 19:32:08 +02:00
committed by Christian Helmuth
parent a96919632e
commit 963a6c37a0
4 changed files with 64 additions and 13 deletions
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10
repos/base-nova/src/core/include/signal_broker.h
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@ -24,6 +24,7 @@
#include <platform.h>
#include <signal_source_component.h>
#include <signal_source/capability.h>
#include <signal_context_slab.h>
namespace Genode { class Signal_broker; }
@ -38,8 +39,7 @@ class Genode::Signal_broker
Rpc_entrypoint &_context_ep;
Signal_source_component _source;
Signal_source_capability _source_cap;
Tslab<Signal_context_component,
960*sizeof(long)> _contexts_slab { &_md_alloc };
Signal_context_slab _context_slab { _md_alloc };
public:
@ -62,7 +62,7 @@ class Genode::Signal_broker
_source_ep.dissolve(&_source);
/* free all signal contexts */
while (Signal_context_component *r = _contexts_slab.first_object())
while (Signal_context_component *r = _context_slab.any_signal_context())
free_context(reinterpret_cap_cast<Signal_context>(r->cap()));
}
@ -101,7 +101,7 @@ class Genode::Signal_broker
}
/* the _contexts_slab may throw Allocator::Out_of_memory */
_obj_pool.insert(new (&_contexts_slab) Signal_context_component(cap));
_obj_pool.insert(new (&_context_slab) Signal_context_component(cap));
/* return unique capability for the signal context */
return cap;
@ -121,7 +121,7 @@ class Genode::Signal_broker
Hex(context_cap.local_name()));
return;
}
destroy(&_contexts_slab, context);
destroy(&_context_slab, context);
Nova::revoke(Nova::Obj_crd(context_cap.local_name(), 0));
cap_map()->remove(context_cap.local_name(), 0);