Squashed 'tmk_core/' changes from 7967731..b9e0ea0

b9e0ea0 Merge commit '7fa9d8bdea3773d1195b04d98fcf27cf48ddd81d' as 'tool/mbed/mbed-sdk'
7fa9d8b Squashed 'tool/mbed/mbed-sdk/' content from commit 7c21ce5

git-subtree-dir: tmk_core
git-subtree-split: b9e0ea08cb940de20b3610ecdda18e9d8cd7c552

tool/mbed/mbed-sdk/libraries/tests/rtos/mbed/mutex/main.cpp

@@ -0,0 +1,87 @@
+#include "mbed.h"
+#include "test_env.h"
+#include "rtos.h"
+
+#define THREAD_DELAY     50
+#define SIGNALS_TO_EMIT  100
+
+/*
+ * The stack size is defined in cmsis_os.h mainly dependent on the underlying toolchain and
+ * the C standard library. For GCC, ARM_STD and IAR it is defined with a size of 2048 bytes
+ * and for ARM_MICRO 512. Because of reduce RAM size some targets need a reduced stacksize.
+ */
+#if defined(TARGET_STM32L053R8) || defined(TARGET_STM32L053C8)
+    #define STACK_SIZE DEFAULT_STACK_SIZE/4
+#else
+    #define STACK_SIZE DEFAULT_STACK_SIZE
+#endif
+
+void print_char(char c = '*') {
+    printf("%c", c);
+    fflush(stdout);
+}
+
+Mutex stdio_mutex;
+DigitalOut led(LED1);
+
+volatile int change_counter = 0;
+volatile bool changing_counter = false;
+volatile bool mutex_defect = false;
+
+bool manipulate_protected_zone(const int thread_delay) {
+    bool result = true;
+
+    stdio_mutex.lock(); // LOCK
+    if (changing_counter == true) {
+        // 'e' stands for error. If changing_counter is true access is not exclusively
+        print_char('e');
+        result = false;
+        mutex_defect = true;
+    }
+    changing_counter = true;
+
+    // Some action on protected
+    led = !led;
+    change_counter++;
+    print_char('.');
+    Thread::wait(thread_delay);
+
+    changing_counter = false;
+    stdio_mutex.unlock();   // UNLOCK
+    return result;
+}
+
+void test_thread(void const *args) {
+    const int thread_delay = int(args);
+    while (true) {
+        manipulate_protected_zone(thread_delay);
+    }
+}
+
+int main() {
+    MBED_HOSTTEST_TIMEOUT(20);
+    MBED_HOSTTEST_SELECT(default);
+    MBED_HOSTTEST_DESCRIPTION(Mutex resource lock);
+    MBED_HOSTTEST_START("RTOS_2");
+
+    const int t1_delay = THREAD_DELAY * 1;
+    const int t2_delay = THREAD_DELAY * 2;
+    const int t3_delay = THREAD_DELAY * 3;
+    Thread t2(test_thread, (void *)t2_delay, osPriorityNormal, STACK_SIZE);
+    Thread t3(test_thread, (void *)t3_delay, osPriorityNormal, STACK_SIZE);
+
+    while (true) {
+        // Thread 1 action
+        Thread::wait(t1_delay);
+        manipulate_protected_zone(t1_delay);
+        if (change_counter >= SIGNALS_TO_EMIT or mutex_defect == true) {
+            t2.terminate();
+            t3.terminate();
+            break;
+        }
+    }
+
+    fflush(stdout);
+    MBED_HOSTTEST_RESULT(!mutex_defect);
+    return 0;
+}