tests: add some pthread and std::thread unit tests

This patch adds some pthread and C++11 std::thread unit tests.

Change-Id: I9706b542e5fa927a87c6e8ae2a6330fab7bb5d72
Reviewed-on: https://gem5-review.googlesource.com/8221
Reviewed-by: Jason Lowe-Power <jason@lowepower.com>
Maintainer: Brandon Potter <Brandon.Potter@amd.com>

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;
+}