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#include "mbed.h"
#include "test_env.h"
#include "rtos.h"
#define THREAD_DELAY 75
#define SEMAPHORE_SLOTS 2
#define SEM_CHANGES 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);
}
Semaphore two_slots(SEMAPHORE_SLOTS);
volatile int change_counter = 0;
volatile int sem_counter = 0;
volatile bool sem_defect = false;
void test_thread(void const *delay) {
const int thread_delay = int(delay);
while (true) {
two_slots.wait();
sem_counter++;
const bool sem_lock_failed = sem_counter > SEMAPHORE_SLOTS;
const char msg = sem_lock_failed ? 'e' : sem_counter + '0';
print_char(msg);
if (sem_lock_failed) {
sem_defect = true;
}
Thread::wait(thread_delay);
print_char('.');
sem_counter--;
change_counter++;
two_slots.release();
}
}
int main (void) {
MBED_HOSTTEST_TIMEOUT(20);
MBED_HOSTTEST_SELECT(default_auto);
MBED_HOSTTEST_DESCRIPTION(Semaphore resource lock);
MBED_HOSTTEST_START("RTOS_3");
const int t1_delay = THREAD_DELAY * 1;
const int t2_delay = THREAD_DELAY * 2;
const int t3_delay = THREAD_DELAY * 3;
Thread t1(test_thread, (void *)t1_delay, osPriorityNormal, STACK_SIZE);
Thread t2(test_thread, (void *)t2_delay, osPriorityNormal, STACK_SIZE);
Thread t3(test_thread, (void *)t3_delay, osPriorityNormal, STACK_SIZE);
while (true) {
if (change_counter >= SEM_CHANGES or sem_defect == true) {
t1.terminate();
t2.terminate();
t3.terminate();
break;
}
}
fflush(stdout);
MBED_HOSTTEST_RESULT(!sem_defect);
return 0;
}
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