13hannes11/UU_la_parallel_programming_practical_assignments
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fix LazySet causing segmentation fault or hanging

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This commit is contained in:
Hannes Kuchelmeister
2021-01-02 18:39:54 +01:00
parent e76cc094e5
commit 6629065b6e
1 changed files with 13 additions and 14 deletions
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27
Assignment_2/lib/LazyList.cpp
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@@ -5,7 +5,7 @@
class LazySet:public Set {
protected:
void locate(int element, Node* prev, Node* cur);
void locate(int element, Node** prev, Node** cur);
public:
LazySet();
@@ -19,25 +19,23 @@ LazySet::LazySet() : Set("LazySet") { }
bool LazySet::add(int element) {
Node* p;
Node* c;
locate(element, p, c);
locate(element, &p, &c);
if (c->is_equal(element)) {
p->unlock();
c->unlock();
return false;
} else {
Node* n = new Node(element);
n->next = c;
p->next = n;
p->unlock();
c->unlock();
return true;
}
}
bool LazySet::rmv(int element) {
std::cout<< "rmv " << element << std::endl;
Node* p;
Node* c;
locate(element, p, c);
locate(element, &p, &c);
if (c->is_equal(element)) {
c->deleted = true;
@@ -53,7 +51,7 @@ bool LazySet::rmv(int element) {
}
}
bool LazySet::ctn(int element) {
Node* c = first;
Node* c = first->next;
while (c->is_smaller_than(element)) {
c = c->next;
}
@@ -65,9 +63,9 @@ bool LazySet::ctn(int element) {
}
void LazySet::locate(int element, Node* prev, Node* cur) {
prev = Node::Dummy();
cur = Node::Dummy();
void LazySet::locate(int element, Node** prev, Node** cur) {
*prev = Node::Dummy();
*cur = Node::Dummy();
Node* p = first;
Node* c = p->next;
@@ -78,9 +76,10 @@ void LazySet::locate(int element, Node* prev, Node* cur) {
}
p->lock();
c->lock();
if (!p->deleted && !c->deleted && p->next == c) {
prev = p;
cur = c;
*prev = p;
*cur = c;
}
p->unlock();