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#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;
}
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