From: Ivan Maidanski <ivmai@mail.ru>
Date: Fri, 17 Nov 2017 17:36:47 +0000 (+0300)
Subject: Allow to turn on spin locking even if thread-local allocations are used
X-Git-Tag: v8.0.0~508
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=7878157e464d955fa209e3cbd1d13e98853fd1f4;p=gc

Allow to turn on spin locking even if thread-local allocations are used

* include/private/gc_locks.h [GC_PTHREADS && !GC_WIN32_THREADS
&& THREAD_LOCAL_ALLOC && !USE_PTHREAD_LOCKS] (UNCOND_LOCK,
UNCOND_UNLOCK): Use spin locks if USE_SPIN_LOCK is defined by client.
---

diff --git a/include/private/gc_locks.h b/include/private/gc_locks.h
index 6b1d1e0a..fd56fc84 100644
--- a/include/private/gc_locks.h
+++ b/include/private/gc_locks.h
@@ -120,11 +120,13 @@
 #    define NO_THREAD ((unsigned long)(-1l))
                 /* != NUMERIC_THREAD_ID(pthread_self()) for any thread */
 
-#    if !defined(THREAD_LOCAL_ALLOC) && !defined(USE_PTHREAD_LOCKS)
+#    if (!defined(THREAD_LOCAL_ALLOC) || defined(USE_SPIN_LOCK)) \
+        && !defined(USE_PTHREAD_LOCKS)
       /* In the THREAD_LOCAL_ALLOC case, the allocation lock tends to   */
       /* be held for long periods, if it is held at all.  Thus spinning */
       /* and sleeping for fixed periods are likely to result in         */
       /* significant wasted time.  We thus rely mostly on queued locks. */
+#     undef USE_SPIN_LOCK
 #     define USE_SPIN_LOCK
       GC_EXTERN volatile AO_TS_t GC_allocate_lock;
       GC_INNER void GC_lock(void);