MonetDB: Dec2016 - If we have MS_ASYNC, i.e. asynchronous msync,...

[Sjoerd Mullender]

Changeset: 2cdfaed6227c for MonetDB
URL: http://dev.monetdb.org/hg/MonetDB?cmd=changeset;node=2cdfaed6227c
Modified Files:
        gdk/gdk_storage.c
Branch: Dec2016
Log Message:

If we have MS_ASYNC, i.e. asynchronous msync, use it instead of forking off a 
thread.


diffs (38 lines):

diff --git a/gdk/gdk_storage.c b/gdk/gdk_storage.c
--- a/gdk/gdk_storage.c
+++ b/gdk/gdk_storage.c
@@ -637,6 +637,7 @@ DESCclean(BAT *b)
 #define MSYNC_BACKGROUND
 
 #ifndef DISABLE_MSYNC
+#ifndef MS_ASYNC
 struct msync {
        bat id;
        Heap *h;
@@ -652,11 +653,18 @@ BATmsyncImplementation(void *arg)
        GDKfree(arg);
 }
 #endif
+#endif
 
 void
 BATmsync(BAT *b)
 {
 #ifndef DISABLE_MSYNC
+#ifdef MS_ASYNC
+       if (b->theap.storage == STORE_MMAP)
+               (void) msync(b->theap.base, b->theap.free, MS_ASYNC);
+       if (b->tvheap && b->tvheap->storage == STORE_MMAP)
+               (void) msync(b->tvheap->base, b->tvheap->free, MS_ASYNC);
+#else
 #ifdef MSYNC_BACKGROUND
        MT_Id tid;
 #endif
@@ -694,6 +702,7 @@ BATmsync(BAT *b)
                BATmsyncImplementation(arg);
 #endif
        }
+#endif
 #else
        (void) b;
 #endif /* DISABLE_MSYNC */
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