On Tuesday 03 November 2015 22:20:52 Octavian Purdila wrote:
> +struct pthread_sem {
> + pthread_mutex_t lock;
> + int count;
> + pthread_cond_t cond;
> +};
> +
> +static void *sem_alloc(int count)
> +{
> + struct pthread_sem *sem;
> +
> + sem = malloc(sizeof(*sem));
> + if (!sem)
> + return NULL;
> +
> + pthread_mutex_init(&sem->lock, NULL);
> + sem->count = count;
> + pthread_cond_init(&sem->cond, NULL);
> +
> + return sem;
> +}
What is the reason to have generalized semaphores in the
host API rather than a simple mutex?
> +static unsigned long long time_ns(void)
> +{
> + struct timeval tv;
> +
> + gettimeofday(&tv, NULL);
> +
> + return tv.tv_sec * 1000000000ULL + tv.tv_usec * 1000ULL;
> +}
clock_gettime() has been around since POSIX.1-2001 and provides the
nanosecond resolution you use in the interface.
Arnd
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