Preempt Systems
-
Verified
Our mission is a hard real-time operating system that is POSIX source-compatible with Linux.
QuantumRT implements the POSIX API (PSE51). Application code moves between Linux and QuantumRT without being rewritten against a proprietary API: pthreads, POSIX message queues, timers, and named semaphores behave as the standard specifies.
Every syscall has a proven worst-case bound, and the scheduler and timer are O(1): selecting the next thread and servicing the next timer take the same bounded time regardless of how many threads or pending timers exist. Precise Scheduling replaces the periodic tick with a one-shot hardware comparator armed to the next deadline, so timed wakeups occur at full timespec resolution rather than being rounded to a fixed tick interval.
The application logic is identical whether the target is Linux or QuantumRT. A periodic task looks like this:
#include <time.h>
static void *worker(void *arg)
{
struct timespec next;
clock_gettime(CLOCK_MONOTONIC, &next);
for (;;)
{
next.tv_sec += 1;
clock_nanosleep(CLOCK_MONOTONIC, TIMER_ABSTIME, &next, NULL);
do_work(arg);
}
return NULL;
}QuantumRT is at preemptsystems.com. For an evaluation license or technical questions, email contact@preemptsystems.com.
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