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track multiple writes

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This commit is contained in:
Aiden McClelland
2021-09-27 18:03:47 -06:00
parent 6f3921e329
commit e442ae6234
1 changed files with 13 additions and 5 deletions
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18
patch-db/src/locker.rs
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@@ -126,13 +126,13 @@ impl Trie {
#[derive(Debug, Default)]
struct Node {
readers: Vec<u64>,
writers: HashSet<u64>,
writers: Vec<u64>,
reqs: Vec<Request>,
}
impl Node {
// true: If there are any writers, it is `id`.
fn write_free(&self, id: u64) -> bool {
self.writers.is_empty() || (self.writers.len() == 1 && self.writers.contains(&id))
self.writers.is_empty() || (self.writers.iter().filter(|a| a != &&id).count() == 0)
}
// true: If there are any readers, it is `id`.
fn read_free(&self, id: u64) -> bool {
@@ -158,7 +158,7 @@ impl Node {
locks_on_lease: &mut Vec<oneshot::Receiver<LockInfo>>,
) -> Option<Request> {
if req.lock_info.write() && self.write_available(req.lock_info.handle_id) {
self.writers.insert(req.lock_info.handle_id);
self.writers.push(req.lock_info.handle_id);
req.process(locks_on_lease)
} else if !req.lock_info.write() && self.read_available(req.lock_info.handle_id) {
self.readers.push(req.lock_info.handle_id);
@@ -170,7 +170,15 @@ impl Node {
}
fn release(&mut self, mut lock_info: LockInfo) -> Option<LockInfo> {
if lock_info.write() {
self.writers.remove(&lock_info.handle_id);
if let Some(idx) = self
.writers
.iter()
.enumerate()
.find(|(_, id)| id == &&lock_info.handle_id)
.map(|(idx, _)| idx)
{
self.writers.swap_remove(idx);
}
} else if let Some(idx) = self
.readers
.iter()
@@ -178,7 +186,7 @@ impl Node {
.find(|(_, id)| id == &&lock_info.handle_id)
.map(|(idx, _)| idx)
{
self.readers.swap_remove(idx);
assert!(lock_info.handle_id == self.readers.swap_remove(idx));
}
if lock_info.ptr.len() == lock_info.segments_handled {
None