tests: kernel: added memory slab threadsafe test

TestPurpose: verify API thread safe in multi-threads environment.
Thread safe test is explained with more details here:
https://gerrit.zephyrproject.org/r/#/c/9464/7/ test_mpool_threadsafe.c
Please comment if you think it necessary as an extensive kernel test.

Jira: ZEP-1209

Change-Id: I52a7ff393d72785622c047289e7d92286e131cc7
Signed-off-by: Sharron LIU <sharron.liu@intel.com>

tests/kernel/mem_slab/test_mslab_threadsafe/Makefile

@@ -0,0 +1,4 @@
+BOARD ?= qemu_x86
+CONF_FILE = prj.conf
+
+include ${ZEPHYR_BASE}/Makefile.test

tests/kernel/mem_slab/test_mslab_threadsafe/prj.conf

@@ -0,0 +1,4 @@
+CONFIG_ZTEST=y
+CONFIG_SYS_CLOCK_TICKS_PER_SEC=1000
+# 1 millisecond
+CONFIG_TIMESLICE_SIZE=1

tests/kernel/mem_slab/test_mslab_threadsafe/src/Makefile

@@ -0,0 +1,3 @@
+include $(ZEPHYR_BASE)/tests/Makefile.test
+
+obj-y = main.o test_mslab_threadsafe.o

tests/kernel/mem_slab/test_mslab_threadsafe/src/main.c

@@ -0,0 +1,27 @@
+/*
+ * Copyright (c) 2016 Intel Corporation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <ztest.h>
+
+extern void test_mslab_threadsafe(void);
+
+/*test case main entry*/
+void test_main(void *p1, void *p2, void *p3)
+{
+	ztest_test_suite(test_mslab_threadsafe,
+		ztest_unit_test(test_mslab_threadsafe));
+	ztest_run_test_suite(test_mslab_threadsafe);
+}

tests/kernel/mem_slab/test_mslab_threadsafe/src/test_mslab_threadsafe.c

@@ -0,0 +1,91 @@
+/*
+ * Copyright (c) 2016 Intel Corporation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * @addtogroup t_mslab
+ * @{
+ * @defgroup t_mslab_threadsafe test_mslab_threadsafe
+ * @brief TestPurpose: verify API thread safe in multi-threads environment
+ * @}
+ */
+
+#include <ztest.h>
+#include <atomic.h>
+#define LOOP 10
+#define STACK_SIZE 512
+#define THREAD_NUM 4
+#define SLAB_NUM 2
+#define TIMEOUT 200
+#define BLK_NUM 3
+#define BLK_ALIGN 4
+#define BLK_SIZE1 8
+#define BLK_SIZE2 4
+
+K_MEM_SLAB_DEFINE(mslab1, BLK_SIZE1, BLK_NUM, BLK_ALIGN);
+static struct k_mem_slab mslab2, *slabs[SLAB_NUM] = {&mslab1, &mslab2};
+static char __noinit __stack tstack[THREAD_NUM][STACK_SIZE];
+static char __aligned(BLK_ALIGN) tslab[BLK_SIZE2 * BLK_NUM];
+static struct k_sem sync_sema;
+static atomic_t slab_id;
+
+/* thread entry simply invoke the APIs*/
+static void tmslab_api(void *p1, void *p2, void *p3)
+{
+	void *block[BLK_NUM];
+	struct k_mem_slab *slab = slabs[atomic_inc(&slab_id) % SLAB_NUM];
+	int i = LOOP;
+
+	while (i--) {
+		memset(block, 0, sizeof(block));
+
+		for (int i = 0; i < BLK_NUM; i++) {
+			k_mem_slab_alloc(slab, &block[i], TIMEOUT);
+		}
+		for (int i = 0; i < BLK_NUM; i++) {
+			if (block[i]) {
+				k_mem_slab_free(slab, &block[i]);
+				block[i] = NULL;
+			}
+		}
+	}
+
+	k_sem_give(&sync_sema);
+}
+
+/* test cases*/
+void test_mslab_threadsafe(void)
+{
+	k_tid_t tid[THREAD_NUM];
+
+	k_mem_slab_init(&mslab2, tslab, BLK_SIZE2, BLK_NUM);
+	k_sem_init(&sync_sema, 0, THREAD_NUM);
+
+	/* create multiple threads to invoke same memory slab APIs*/
+	for (int i = 0; i < THREAD_NUM; i++) {
+		tid[i] = k_thread_spawn(tstack[i], STACK_SIZE,
+			tmslab_api, NULL, NULL, NULL,
+			K_PRIO_PREEMPT(1), 0, 0);
+	}
+	/* TESTPOINT: all threads complete and exit the entry function*/
+	for (int i = 0; i < THREAD_NUM; i++) {
+		k_sem_take(&sync_sema, K_FOREVER);
+	}
+
+	/* test case tear down*/
+	for (int i = 0; i < THREAD_NUM; i++) {
+		k_thread_abort(tid[i]);
+	}
+}

tests/kernel/mem_slab/test_mslab_threadsafe/testcase.ini

@@ -0,0 +1,2 @@
+[test]
+tags = kernel