cml/libcw
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

cwMpScQueue.h : replace use of atomic exchange

Browse Source
This commit is contained in:
kevin 2021-01-12 15:57:57 -05:00
parent 1f5381d735
commit 41c3f0eb34
1 changed files with 4 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
cwMpScQueue.h
View File

@ -47,8 +47,11 @@ namespace cw
// Note that the elements of the queue are only accessed from the end of the queue (tail). // Note that the elements of the queue are only accessed from the end of the queue (tail).
// New nodes can therefore safely be updated in two steps: // New nodes can therefore safely be updated in two steps:
node_t* prev = _head;
_head = new_node;
// 1. Atomically set _head to the new node and return 'old-head' // 1. Atomically set _head to the new node and return 'old-head'
node_t* prev = _head.exchange(new_node,std::memory_order_acq_rel); //node_t* prev = _head.exchange(new_node,std::memory_order_acq_rel);
// Note that at this point only the new node may have the 'old-head' as it's predecssor. // Note that at this point only the new node may have the 'old-head' as it's predecssor.
// Other threads may therefore safely interrupt at this point. // Other threads may therefore safely interrupt at this point.