main.cpp

00001 #include "mbed.h"
00002 #include "test_env.h"
00003 #include "rtos.h"
00004 
00005 #if defined(MBED_RTOS_SINGLE_THREAD)
00006   #error [NOT_SUPPORTED] test not supported
00007 #endif
00008 
00009 #define THREAD_DELAY     50
00010 #define SIGNALS_TO_EMIT  100
00011 
00012 /*
00013  * The stack size is defined in cmsis_os.h mainly dependent on the underlying toolchain and
00014  * the C standard library. For GCC, ARM_STD and IAR it is defined with a size of 2048 bytes
00015  * and for ARM_MICRO 512. Because of reduce RAM size some targets need a reduced stacksize.
00016  */
00017 #if defined(TARGET_STM32F334R8) && defined(TOOLCHAIN_IAR)
00018     #define STACK_SIZE DEFAULT_STACK_SIZE/4
00019 #elif (defined(TARGET_STM32F070RB) || defined(TARGET_STM32F072RB))
00020     #define STACK_SIZE DEFAULT_STACK_SIZE/2
00021 #elif defined(TARGET_STM32F302R8) && defined(TOOLCHAIN_IAR)
00022     #define STACK_SIZE DEFAULT_STACK_SIZE/2
00023 #elif defined(TARGET_STM32F303K8) && defined(TOOLCHAIN_IAR)
00024     #define STACK_SIZE DEFAULT_STACK_SIZE/2
00025 #elif defined(TARGET_STM32F334C8)
00026     #define STACK_SIZE DEFAULT_STACK_SIZE/2
00027 #elif defined(TARGET_STM32L073RZ)
00028     #define STACK_SIZE DEFAULT_STACK_SIZE/2
00029 #elif (defined(TARGET_EFM32HG_STK3400)) && !defined(TOOLCHAIN_ARM_MICRO)
00030     #define STACK_SIZE 512
00031 #elif (defined(TARGET_EFM32LG_STK3600) || defined(TARGET_EFM32WG_STK3800) || defined(TARGET_EFM32PG_STK3401)) && !defined(TOOLCHAIN_ARM_MICRO)
00032     #define STACK_SIZE 768
00033 #elif (defined(TARGET_EFM32GG_STK3700)) && !defined(TOOLCHAIN_ARM_MICRO)
00034     #define STACK_SIZE 1536
00035 #elif defined(TARGET_MCU_NRF51822)
00036     #define STACK_SIZE 768
00037 #else
00038     #define STACK_SIZE DEFAULT_STACK_SIZE
00039 #endif
00040 
00041 void print_char(char c = '*') {
00042     printf("%c", c);
00043     fflush(stdout);
00044 }
00045 
00046 Mutex stdio_mutex;
00047 DigitalOut led(LED1);
00048 
00049 volatile int change_counter = 0;
00050 volatile bool changing_counter = false;
00051 volatile bool mutex_defect = false;
00052 
00053 bool manipulate_protected_zone(const int thread_delay) {
00054     bool result = true;
00055 
00056     stdio_mutex.lock(); // LOCK
00057     if (changing_counter == true) {
00058         // 'e' stands for error. If changing_counter is true access is not exclusively
00059         print_char('e');
00060         result = false;
00061         mutex_defect = true;
00062     }
00063     changing_counter = true;
00064 
00065     // Some action on protected
00066     led = !led;
00067     change_counter++;
00068     print_char('.');
00069     Thread::wait(thread_delay);
00070 
00071     changing_counter = false;
00072     stdio_mutex.unlock();   // UNLOCK
00073     return result;
00074 }
00075 
00076 void test_thread(void const *args) {
00077     const int thread_delay = int(args);
00078     while (true) {
00079         manipulate_protected_zone(thread_delay);
00080     }
00081 }
00082 
00083 int main() {
00084     MBED_HOSTTEST_TIMEOUT(20);
00085     MBED_HOSTTEST_SELECT(default);
00086     MBED_HOSTTEST_DESCRIPTION(Mutex resource lock);
00087     MBED_HOSTTEST_START("RTOS_2");
00088 
00089     const int t1_delay = THREAD_DELAY * 1;
00090     const int t2_delay = THREAD_DELAY * 2;
00091     const int t3_delay = THREAD_DELAY * 3;
00092     Thread t2(test_thread, (void *)t2_delay, osPriorityNormal, STACK_SIZE);
00093     Thread t3(test_thread, (void *)t3_delay, osPriorityNormal, STACK_SIZE);
00094 
00095     while (true) {
00096         // Thread 1 action
00097         Thread::wait(t1_delay);
00098         manipulate_protected_zone(t1_delay);
00099         if (change_counter >= SIGNALS_TO_EMIT or mutex_defect == true) {
00100             t2.terminate();
00101             t3.terminate();
00102             break;
00103         }
00104     }
00105 
00106     fflush(stdout);
00107     MBED_HOSTTEST_RESULT(!mutex_defect);
00108     return 0;
00109 }