linux-kernel - Re: [RFC PATCH 21/28] lkl tools: host lib: posix host operations

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Message-ID: <42449799.QsmXDGnQ4P@wuerfel>
Date:	Sun, 08 Nov 2015 00:16:40 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	Octavian Purdila <octavian.purdila@...el.com>
Cc:	linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org,
	thehajime@...il.com
Subject: Re: [RFC PATCH 21/28] lkl tools: host lib: posix host operations

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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