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Diffstat (limited to 'NEWS')
| -rw-r--r-- | NEWS | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/NEWS b/NEWS index 608538f77f..991ee63f7c 100644 --- a/NEWS +++ b/NEWS @@ -80,6 +80,17 @@ Version 2.26 * The stack_t type no longer has the name struct sigaltstack. This changes the C++ name mangling for interfaces involving this type. +* The synchronization that pthread_spin_unlock performs has been changed + to now be equivalent to a C11 atomic store with release memory order to + the spin lock's memory location. This ensures correct synchronization + for the spin lock's operations and critical sections protected by a spin + lock. Previously, several (but not all) architectures used stronger + synchronization (e.g., containing what is often called a full barrier). + This change can improve performance, but may affect odd fringe uses of + spin locks that depend on the previous behavior (e.g., using spin locks + as atomic variables to try to implement Dekker's mutual exclusion + algorithm). + Security related changes: * The DNS stub resolver limits the advertised UDP buffer size to 1200 bytes, |