Update from 2.3.14.
authordrepper <drepper>
Mon, 1 Dec 1997 16:40:08 +0000 (16:40 +0000)
committerdrepper <drepper>
Mon, 1 Dec 1997 16:40:08 +0000 (16:40 +0000)
db2/os/os_spin.c [new file with mode: 0644]

diff --git a/db2/os/os_spin.c b/db2/os/os_spin.c
new file mode 100644 (file)
index 0000000..fb693c2
--- /dev/null
@@ -0,0 +1,56 @@
+/*-
+ * See the file LICENSE for redistribution information.
+ *
+ * Copyright (c) 1997
+ *     Sleepycat Software.  All rights reserved.
+ */
+
+#include "config.h"
+
+#ifndef lint
+static const char sccsid[] = "@(#)os_spin.c    10.3 (Sleepycat) 11/25/97";
+#endif /* not lint */
+
+#ifndef NO_SYSTEM_INCLUDES
+#include <sys/types.h>
+
+#include <limits.h>
+#include <unistd.h>
+#endif
+
+#include "db_int.h"
+
+/*
+ * __os_spin --
+ *     Return the number of default spins before blocking.
+ *
+ * PUBLIC: int __os_spin __P((void));
+ */
+int
+__os_spin()
+{
+       extern int __db_tsl_spins;
+
+       /* If the application specified the spins, use its value. */
+       if (__db_tsl_spins != 0)
+               return (__db_tsl_spins);
+
+       /*
+        * XXX
+        * Sysconf: Solaris uses _SC_NPROCESSORS_ONLN to return the number
+        * of online processors.  I don't know if this call is portable or
+        * not.
+        */
+#if defined(HAVE_SYSCONF) && defined(_SC_NPROCESSORS_ONLN)
+       {
+               long sys_val;
+
+               sys_val = sysconf(_SC_NPROCESSORS_ONLN);
+               if (sys_val > 0)
+                       return (sys_val * 50);
+       }
+#endif
+
+       /* Default to a single processor. */
+       return (1);
+}