diff options
Diffstat (limited to 'tests/test-progs/pthread/src/test_std_condition_variable.cpp')
-rw-r--r-- | tests/test-progs/pthread/src/test_std_condition_variable.cpp | 98 |
1 files changed, 98 insertions, 0 deletions
diff --git a/tests/test-progs/pthread/src/test_std_condition_variable.cpp b/tests/test-progs/pthread/src/test_std_condition_variable.cpp new file mode 100644 index 000000000..012c509eb --- /dev/null +++ b/tests/test-progs/pthread/src/test_std_condition_variable.cpp @@ -0,0 +1,98 @@ +/* + * Copyright (c) 2018, Cornell University + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or + * without modification, are permitted provided that the following + * conditions are met: + * + * Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * + * Redistributions in binary form must reproduce the above + * copyright notice, this list of conditions and the following + * disclaimer in the documentation and/or other materials provided + * with the distribution. + * + * Neither the name of Cornell University nor the names of its + * contributors may be used to endorse or promote products derived + * from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND + * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, + * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE + * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR + * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF + * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED + * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN + * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + * + * Authors: Moyang Wang + */ + +#include <condition_variable> +#include <iostream> +#include <mutex> +#include <thread> +#include <vector> + +//------------------------------------------------------------------------ +// Test std::condition_variable +//------------------------------------------------------------------------ +// The master thread creates N threads, each of which waits on a +// condition variable of a signal to start. The master thread then set +// the signal and notifies all other threads to begin. + +#define MAX_N_WORKER_THREADS 10 + +std::mutex mtx; +std::condition_variable cv; +bool ready = false; + +void print_id( size_t id ) +{ + std::unique_lock<std::mutex> lck(mtx); + while (!ready) + cv.wait(lck); + // ... + std::cout << "thread " << id << '\n'; +} + +void go() +{ + std::unique_lock<std::mutex> lck(mtx); + ready = true; + cv.notify_all(); +} + +int main( int argc, char* argv[] ) +{ + size_t n_worker_threads = 0; + + std::vector< std::thread > threads; + + for ( size_t i = 0; i < MAX_N_WORKER_THREADS; i++ ) { + try { + threads.push_back( std::thread( print_id, i ) ); + } catch ( const std::system_error& err ) { + break; + } + n_worker_threads++; + } + + std::cout << n_worker_threads << " threads ready to race...\n"; + go(); // go! + + for (int i = 0; i < n_worker_threads; ++i) { + threads[i].join(); + } + + // if there is no timeout (i.e., threads are all waken up properly, this + // test always succeeds) + return EXIT_SUCCESS; +} |