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ircd::ctx: Improve ctx::parallel template.

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This commit is contained in:
Jason Volk 2018-12-26 17:12:28 -08:00
parent 5fb887096b
commit b0d5e5d4c8
1 changed files with 50 additions and 26 deletions
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76
include/ircd/ctx/parallel.h
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@ -26,26 +26,29 @@ struct ircd::ctx::parallel
closure c;
dock d;
std::exception_ptr eptr;
size_t snd {0};
size_t rcv {0};
size_t out {0};
ushort snd {0};
ushort rcv {0};
ushort out {0};
void receiver() noexcept;
public:
void wait_avail();
void wait_done();
void operator()();
void operator()(const arg &a);
parallel(pool &, vector_view<arg>, closure);
parallel(pool &, const vector_view<arg> &, closure);
~parallel() noexcept;
};
template<class arg>
ircd::ctx::parallel<arg>::parallel(pool &p,
vector_view<arg> a,
const vector_view<arg> &a,
closure c)
:p{&p}
,a{std::move(a)}
,a{a}
,c{std::move(c)}
{
p.min(this->a.size());
@ -67,29 +70,51 @@ ircd::ctx::parallel<arg>::operator()(const arg &a)
if(this->eptr)
std::rethrow_exception(this->eptr);
auto &p(*this->p);
this->a.at(snd++ % this->a.size()) = a;
this->a.at(snd++) = a;
snd %= this->a.size();
out++;
p([this]()
mutable
auto &p(*this->p);
p(std::bind(&parallel::receiver, this));
}
template<class arg>
void
ircd::ctx::parallel<arg>::operator()()
{
wait_avail();
if(this->eptr)
std::rethrow_exception(this->eptr);
snd++;
snd %= this->a.size();
out++;
auto &p(*this->p);
p(std::bind(&parallel::receiver, this));
}
template<class arg>
void
ircd::ctx::parallel<arg>::receiver()
noexcept
{
auto &a
{
auto &a
{
this->a.at(rcv++ % this->a.size())
};
this->a.at(rcv++ % this->a.size())
};
if(!this->eptr) try
{
c(a);
}
catch(...)
{
this->eptr = std::current_exception();
}
if(!this->eptr) try
{
c(a);
}
catch(...)
{
this->eptr = std::current_exception();
}
out--;
d.notify_one();
});
out--;
d.notify_one();
}
template<class arg>
@ -98,7 +123,6 @@ ircd::ctx::parallel<arg>::wait_avail()
{
d.wait([this]
{
assert(snd >= rcv);
return out < a.size();
});
}