PTHREAD_STACK_MIN
STATIC_ASSERT(PTHREAD_STACK_MIN >= MIN_USER_STACK_SIZE
&& PTHREAD_STACK_MIN <= MAX_USER_STACK_SIZE);
if (stacksize < PTHREAD_STACK_MIN || stacksize > MAX_USER_STACK_SIZE)
STATIC_ASSERT(PTHREAD_STACK_MIN >= MIN_USER_STACK_SIZE
&& PTHREAD_STACK_MIN <= MAX_USER_STACK_SIZE);
if (stacksize < PTHREAD_STACK_MIN || stacksize > MAX_USER_STACK_SIZE)
stackSize = PTHREAD_STACK_MIN;