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lxip: do not poll for nic session signals 

Instead of polling for new Nic session signals, when waiting for
network packets with a timeout, block on the signal receiver, and
register a timer event beforehand using the same signal receiver.

Fix #1862
Ref #1864
This commit is contained in:
Stefan Kalkowski 2016-01-25 15:06:19 +01:00 committed by Christian Helmuth
parent 5fc9f68941
commit b84a47b4db
1 changed files with 19 additions and 16 deletions
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35
repos/dde_linux/src/lib/lxip/lxcc_emul.cc
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@ -533,26 +533,29 @@ unsigned long ilog2(unsigned long n) { return Genode::log2<unsigned long>(n); }
** linux/sched.h **
*******************/
struct Timeout : Genode::Signal_dispatcher<Timeout>
{
void handle(unsigned) { update_jiffies(); }
Timeout(Timer::Session_client &timer, signed long msec)
: Signal_dispatcher<Timeout>(*Net::Env::receiver(), *this, &Timeout::handle)
{
if (msec > 0) {
timer.sigh(*this);
timer.trigger_once(msec*1000);
}
}
};
static void __wait_event(signed long timeout)
{
static Timer::Connection timer;
/* timeout is relative in jiffies, make it absolute */
timeout += jiffies;
static Timer::Connection timer;
Timeout to(timer, timeout);
/* wait for signal and return upon timeout */
while (timeout > jiffies && !Net::Env::receiver()->pending())
{
timer.msleep(1);
update_jiffies();
if (timeout <= jiffies)
return;
}
/* dispatch signal */
Genode::Signal s = Net::Env::receiver()->wait_for_signal();
static_cast<Genode::Signal_dispatcher_base *>(s.context())->dispatch(s.num());
/* dispatch signal */
Genode::Signal s = Net::Env::receiver()->wait_for_signal();
static_cast<Genode::Signal_dispatcher_base *>(s.context())->dispatch(s.num());
}