Example #1
0
void*
mono_shared_area (void)
{
	int fd;
	int pid = getpid ();
	/* we should allow the user to configure the size */
	int size = mono_pagesize ();
	char buf [128];
	void *res;
	SAreaHeader *header;

	if (shared_area_disabled ()) {
		if (!malloced_shared_area)
			malloced_shared_area = malloc_shared_area (0);
		/* get the pid here */
		return malloced_shared_area;
	}

	/* perform cleanup of segments left over from dead processes */
	mono_shared_area_instances_helper (NULL, 0, TRUE);

	g_snprintf (buf, sizeof (buf), "/mono.%d", pid);

	fd = shm_open (buf, O_CREAT|O_EXCL|O_RDWR, S_IRUSR|S_IWUSR|S_IRGRP);
	if (fd == -1 && errno == EEXIST) {
		/* leftover */
		shm_unlink (buf);
		fd = shm_open (buf, O_CREAT|O_EXCL|O_RDWR, S_IRUSR|S_IWUSR|S_IRGRP);
	}
	/* in case of failure we try to return a memory area anyway,
	 * even if it means the data can't be read by other processes
	 */
	if (fd == -1)
		return malloc_shared_area (pid);
	if (ftruncate (fd, size) != 0) {
		shm_unlink (buf);
		close (fd);
	}
	BEGIN_CRITICAL_SECTION;
	res = mmap (NULL, size, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0);
	END_CRITICAL_SECTION;

	if (res == MAP_FAILED) {
		shm_unlink (buf);
		close (fd);
		return malloc_shared_area (pid);
	}
	/* we don't need the file descriptor anymore */
	close (fd);
	header = (SAreaHeader *) res;
	header->size = size;
	header->pid = pid;
	header->stats_start = sizeof (SAreaHeader);
	header->stats_end = sizeof (SAreaHeader);

	mono_atexit (mono_shared_area_remove);
	return res;
}
Example #2
0
void*
mono_shared_area (void)
{
	if (!malloced_shared_area)
		malloced_shared_area = malloc_shared_area (getpid ());
	/* get the pid here */
	return malloced_shared_area;
}
Example #3
0
void*
mono_shared_area (void)
{
	return malloc_shared_area (getpid ());
}
Example #4
0
void*
mono_shared_area (void)
{
	/* get the pid here */
	return malloc_shared_area (0);
}