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nova: handle race during signal setup phase

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Fixes #1266
This commit is contained in:
Alexander Boettcher 2014-09-30 15:40:16 +02:00 committed by Christian Helmuth
parent 0252d47f28
commit 53d471aa22
2 changed files with 43 additions and 15 deletions
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55
repos/base-nova/include/signal_session/source_rpc_object.h
View File

@ -22,23 +22,52 @@
#include <base/rpc_server.h>
#include <signal_session/nova_source.h>
namespace Genode {
namespace Genode { struct Signal_source_rpc_object; }
struct Signal_source_rpc_object : Rpc_object<Nova_signal_source, Signal_source_rpc_object>
{
protected:
struct Genode::Signal_source_rpc_object : Rpc_object<Nova_signal_source,
Signal_source_rpc_object>
{
private:
Native_capability _blocking_semaphore;
Native_capability _blocking_semaphore;
bool _missed_wakeup;
public:
protected:
void _register_semaphore(Native_capability const &cap)
{
if (_blocking_semaphore.valid())
PWRN("overwritting blocking signal semaphore !!!");
_blocking_semaphore = cap;
void _wakeup_client()
{
if (!_blocking_semaphore.valid()) {
_missed_wakeup = true;
return;
}
};
}
if (_missed_wakeup)
_missed_wakeup = false;
/* wake up client */
uint8_t res = Nova::sm_ctrl(_blocking_semaphore.local_name(),
Nova::SEMAPHORE_UP);
if (res != Nova::NOVA_OK) {
PWRN("%s - signal delivery failed - error %x",
__func__, res);
_missed_wakeup = true;
}
}
public:
void _register_semaphore(Native_capability const &cap)
{
if (_blocking_semaphore.valid())
PWRN("overwritting blocking signal semaphore !!!");
_blocking_semaphore = cap;
if (_missed_wakeup)
_wakeup_client();
}
Signal_source_rpc_object() : _missed_wakeup(false) {}
};
#endif /* _INCLUDE__SIGNAL_SESSION__SOURCE_SERVER_H_ */

3
repos/base-nova/src/core/signal_source_component.cc
View File

@ -46,8 +46,7 @@ void Signal_source_component::submit(Signal_context_component *context,
if (!context->is_enqueued()) {
_signal_queue.enqueue(context);
/* wake up client */
Nova::sm_ctrl(_blocking_semaphore.local_name(), Nova::SEMAPHORE_UP);
_wakeup_client();
}
}