From 6a5d6ea128153f5a00d8c80f15f76004006767da Mon Sep 17 00:00:00 2001 From: Torvald Riegel Date: Tue, 8 Oct 2013 14:17:01 +0300 Subject: benchtests: Add pthread_once common-case test. We have a single thread that runs a no-op initialization once and then repeatedly runs checks of the initialization (i.e., an acquire load and conditional jump) in a tight loop. This gives us, on average, the best-case latency of pthread_once (the initialization is the exactly-once slow path, and we're not looking at initialization-related synchronization overheads in this case). --- benchtests/pthread_once-source.c | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+) create mode 100644 benchtests/pthread_once-source.c (limited to 'benchtests/pthread_once-source.c') diff --git a/benchtests/pthread_once-source.c b/benchtests/pthread_once-source.c new file mode 100644 index 0000000..5f98b0a --- /dev/null +++ b/benchtests/pthread_once-source.c @@ -0,0 +1,25 @@ +/* Measure pthread_once best-case latency (i.e., when already initialized. + + Copyright (C) 2014 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + . */ + +static pthread_once_t once = PTHREAD_ONCE_INIT; + +static void +once_handler (void) +{ +} -- cgit v1.1