bool take( value_type & va, chrono::system_clock::time_point const& abs_time)
{
mutex::scoped_lock lk( head_mtx_);
bool empty = empty_();
if ( ! active_() && empty)
return false;
if ( empty)
{
try
{
while ( active_() && empty_() )
{
if ( ! not_empty_cond_.timed_wait( lk, abs_time) )
return false;
}
}
catch ( fiber_interrupted const&)
{ return false; }
}
if ( ! active_() && empty_() )
return false;
swap( va, head_->va);
pop_head_();
return va;
}
bool try_take( value_type & va)
{
mutex::scoped_lock lk( head_mtx_);
if ( empty_() )
return false;
swap( va, head_->va);
pop_head_();
return va;
}
bool take( value_type & va)
{
mutex::scoped_lock lk( head_mtx_);
bool empty = empty_();
if ( ! active_() && empty)
return false;
if ( empty)
{
try
{
while ( active_() && empty_() )
not_empty_cond_.wait( lk);
}
catch ( fiber_interrupted const&)
{ return false; }
}
if ( ! active_() && empty_() )
return false;
swap( va, head_->va);
pop_head_();
return va;
}
value_type value_pop_( std::unique_lock< mutex > & lk) {
BOOST_ASSERT( ! is_empty_() );
auto old_head = pop_head_();
return std::move( old_head->va);
}
