boost/fiber
2
0
Fork 0
mirror of https://github.com/boostorg/fiber.git synced 2026-02-18 01:52:24 +00:00
Code Issues Projects Releases Wiki Activity

Reimplement waiting_queue::move_to() using fiber_base** scan.

Browse Source 
This simplifies unlinking from the queue.
This commit is contained in:
Nat Goodspeed
2014-11-11 08:38:34 -05:00
parent 2bffbddeaa
commit 20a2f59913
1 changed files with 20 additions and 21 deletions
Download Patch File Download Diff File Expand all files Collapse all files

41
include/boost/fiber/detail/waiting_queue.hpp
View File

@@ -78,32 +78,31 @@ public:
{
BOOST_ASSERT( sched_algo);
worker_fiber * f = static_cast<worker_fiber*>(head_), * prev = 0;
chrono::high_resolution_clock::time_point now( chrono::high_resolution_clock::now() );
while ( 0 != f)
// Search the queue for every worker_fiber 'f' for which fn(f, now)
// returns true. Each time we find such a worker_fiber, unlink it from
// the queue and pass it to sched_algo->awakened().
// Search using a fiber_base**, starting at &head_.
for (fiber_base** fp = &head_; *fp; )
{
worker_fiber * nxt = static_cast<worker_fiber*>(f->nxt_);
if ( fn( f, now) )
worker_fiber *f = static_cast<worker_fiber*>(*fp);
if (! fn(f, now))
{
if ( f == static_cast<worker_fiber*>(head_))
{
BOOST_ASSERT( 0 == prev);
head_ = nxt;
}
else
{
BOOST_ASSERT( 0 != prev);
prev->nxt_ = nxt;
}
f->nxt_ = 0;
f->time_point_reset();
sched_algo->awakened( f);
// If f does NOT meet caller's criteria, skip fp past it.
fp = &(*fp)->nxt_;
}
else
prev = f;
f = nxt;
{
// Here f satisfies our caller. Unlink it from the list.
*fp = (*fp)->nxt_;
f->nxt_ = 0;
// Pass the newly-unlinked worker_fiber* to sched_algo.
f->time_point_reset();
sched_algo->awakened(f);
}
}
}