From 554fd8c5195424bdbcabf5de30fdc183aba391bd Mon Sep 17 00:00:00 2001 From: upstream source tree Date: Sun, 15 Mar 2015 20:14:05 -0400 Subject: obtained gcc-4.6.4.tar.bz2 from upstream website; verified gcc-4.6.4.tar.bz2.sig; imported gcc-4.6.4 source tree from verified upstream tarball. downloading a git-generated archive based on the 'upstream' tag should provide you with a source tree that is binary identical to the one extracted from the above tarball. if you have obtained the source via the command 'git clone', however, do note that line-endings of files in your working directory might differ from line-endings of the respective files in the upstream repository. --- .../performance/30_threads/future/polling.cc | 64 ++++++++++++++++++++++ 1 file changed, 64 insertions(+) create mode 100644 libstdc++-v3/testsuite/performance/30_threads/future/polling.cc (limited to 'libstdc++-v3/testsuite/performance/30_threads/future') diff --git a/libstdc++-v3/testsuite/performance/30_threads/future/polling.cc b/libstdc++-v3/testsuite/performance/30_threads/future/polling.cc new file mode 100644 index 000000000..83fde2710 --- /dev/null +++ b/libstdc++-v3/testsuite/performance/30_threads/future/polling.cc @@ -0,0 +1,64 @@ +// Copyright (C) 2009, 2010 Free Software Foundation, Inc. +// +// This file is part of the GNU ISO C++ Library. This library is free +// software; you can redistribute it and/or modify it under the +// terms of the GNU General Public License as published by the +// Free Software Foundation; either version 3, or (at your option) +// any later version. + +// This 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 General Public License for more details. + +// You should have received a copy of the GNU General Public License along +// with this library; see the file COPYING3. If not see +// . + + +#include +#include +#include + +inline bool is_ready(std::shared_future& f) +{ + return f.wait_for(std::chrono::microseconds(1)); +} + +void poll(std::shared_future f) +{ + while (!is_ready(f)) + { } +} + +int main() +{ +#ifdef TEST_T1 +#define thread_type true +#endif + + using namespace __gnu_test; + time_counter time; + resource_counter resource; + + const int n = 20; + std::promise p; + std::shared_future f = p.get_future(); + std::thread pollers[n]; + for (int i=0; i < n; ++i) + pollers[i] = std::thread(poll, f); + + start_counters(time, resource); + + for (int i = 0; i < 1000000; ++i) + (void)is_ready(f); + p.set_value(); + + for (int i=0; i < n; ++i) + pollers[i].join(); + + stop_counters(time, resource); + report_performance(__FILE__, "", time, resource); + + return 0; +} -- cgit v1.2.3