kfdtest: Factor out multi-process test into a base class

Create KFDMultiProcessTest base class for tests forking multiple
child processes. Derive KFDEvictTest from that class.

Change-Id: Ie5f3362c45be2b807bf7a83839ab3820352a67f9
Signed-off-by: Felix Kuehling <Felix.Kuehling@amd.com>

tests/kfdtest/src/KFDMultiProcessTest.cpp

@@ -0,0 +1,77 @@
+/*
+ * Copyright (C) 2019 Advanced Micro Devices, Inc. All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ */
+
+#include "KFDMultiProcessTest.hpp"
+
+void KFDMultiProcessTest::ForkChildProcesses(int nprocesses) {
+    int i;
+
+    for (i = 0; i < nprocesses - 1; ++i) {
+        pid_t pid = fork();
+        ASSERT_GE(pid, 0);
+
+        if (pid == 0) {
+            /* Child process */
+            /* Cleanup file descriptors copied from parent process
+             * then call SetUp->hsaKmtOpenKFD to create new process
+             */
+            m_psName = "Test process " + std::to_string(i) + " ";
+            TearDown();
+            SetUp();
+            m_ChildPids.clear();
+            m_IsParent = false;
+            m_ProcessIndex = i;
+            return;
+        }
+
+        /* Parent process */
+        m_ChildPids.push_back(pid);
+    }
+
+    m_psName = "Test process " + std::to_string(i) + " ";
+    m_ProcessIndex = i;
+}
+
+void KFDMultiProcessTest::WaitChildProcesses() {
+    if (m_IsParent) {
+        /* Only run by parent process */
+        int childStatus;
+        int childExitOkNum = 0;
+        int size = m_ChildPids.size();
+
+        for (HSAuint32 i = 0; i < size; i++) {
+            pid_t pid = m_ChildPids.front();
+
+            waitpid(pid, &childStatus, 0);
+            if (WIFEXITED(childStatus) == 1 && WEXITSTATUS(childStatus) == 0)
+                childExitOkNum++;
+
+            m_ChildPids.erase(m_ChildPids.begin());
+        }
+
+        EXPECT_EQ(childExitOkNum, size);
+    }
+
+    /* Child process or parent process finished successfully */
+    m_ChildStatus = HSAKMT_STATUS_SUCCESS;
+}