diff options
Diffstat (limited to 'docs/lockcnt.txt')
| -rw-r--r-- | docs/lockcnt.txt | 9 |
1 files changed, 4 insertions, 5 deletions
diff --git a/docs/lockcnt.txt b/docs/lockcnt.txt index 25a8091a53..2a79b3205b 100644 --- a/docs/lockcnt.txt +++ b/docs/lockcnt.txt @@ -142,12 +142,11 @@ can also be more efficient in two ways: - it avoids taking the lock for many operations (for example incrementing the counter while it is non-zero); -- on some platforms, one could implement QemuLockCnt to hold the - lock and the mutex in a single word, making it no more expensive +- on some platforms, one can implement QemuLockCnt to hold the lock + and the mutex in a single word, making the fast path no more expensive than simply managing a counter using atomic operations (see - docs/atomics.txt). This is not implemented yet, but can be - very helpful if concurrent access to the data structure is - expected to be rare. + docs/atomics.txt). This can be very helpful if concurrent access to + the data structure is expected to be rare. Using the same mutex for frees and writes can still incur some small |