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This commit is contained in:
Bassem Girgis
2018-10-18 00:40:34 -05:00
parent fffe4528da
commit 31c32e368a
149 changed files with 5974 additions and 6287 deletions
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43
source/listing_7.19.cpp
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@@ -1,27 +1,22 @@
template<typename T>
class lock_free_queue
{
template <typename T>
class lock_free_queue {
private:
static void free_external_counter(counted_node_ptr &old_node_ptr)
{
node* const ptr=old_node_ptr.ptr;
int const count_increase=old_node_ptr.external_count-2;
node_counter old_counter=
ptr->count.load(std::memory_order_relaxed);
node_counter new_counter;
do
{
new_counter=old_counter;
--new_counter.external_counters;
new_counter.internal_count+=count_increase;
}
while(!ptr->count.compare_exchange_strong(
old_counter,new_counter,
std::memory_order_acquire,std::memory_order_relaxed));
if(!new_counter.internal_count &&
!new_counter.external_counters)
{
delete ptr;
}
static void free_external_counter(counted_node_ptr& old_node_ptr)
{
node* const ptr = old_node_ptr.ptr;
int const count_increase = old_node_ptr.external_count - 2;
node_counter old_counter = ptr->count.load(std::memory_order_relaxed);
node_counter new_counter;
do {
new_counter = old_counter;
--new_counter.external_counters;
new_counter.internal_count += count_increase;
} while (!ptr->count.compare_exchange_strong(old_counter,
new_counter,
std::memory_order_acquire,
std::memory_order_relaxed));
if (!new_counter.internal_count && !new_counter.external_counters) {
delete ptr;
}
}
};