int main() {
int shm_size;
{
shm_size = (1 << 20);
printf("%d read write testing...\n", shm_size);
writewrap(shm_size);
readwrap(shm_size);
}
{
shm_size = (1 << 20) * 10;
printf("%d read write testing...\n", shm_size);
writewrap(shm_size);
readwrap(shm_size);
}
{
shm_size = (1 << 20) * 100;
printf("%d read write testing...\n", shm_size);
writewrap(shm_size);
readwrap(shm_size);
}
{
shm_size = (1 << 20) * 300;
printf("%d read write testing...\n", shm_size);
writewrap(shm_size);
readwrap(shm_size);
}
{
shm_size = (1 << 20) * 500;
printf("%d read write testing...\n", shm_size);
writewrap(shm_size);
readwrap(shm_size);
}
printf("finished!\n");
return 0;
}
int
examsgRngPutVaList(exa_ringbuf_t *rng, va_list ap)
{
examsg_blktail t;
struct examsg_blkhead h;
size_t msgsize = 0, total, avail;
char *buff;
va_list ap2;
/* sanity checks */
if (!rng || rng->magic != EXAMSG_RNG_MAGIC)
return -EINVAL;
examsg_blktail_init(&t);
/* preserve ap as it is used later in this function */
va_copy(ap2, ap);
/* compute size */
while (va_arg(ap2, void *) != NULL)
{
size_t s = va_arg(ap2, size_t);
msgsize += s;
}
/* total size of block, including our overhead */
total = msgsize + sizeof(h) + sizeof(t);
/* check free space */
if (rng->pRd > rng->pWr)
avail = rng->pRd - rng->pWr;
else
avail = rng->size - rng->pWr + rng->pRd;
if (total >= avail)
{
rng->stats.full_count++;
return -ENOSPC;
}
/* Statistics are updated only when putting a message in the ring buffer
* (and not when removing one) because we're interested in "worst cases" */
examsgRngStatsUpdate(rng, total);
/* setup message header */
h.size = msgsize;
h.magic = EXAMSG_HEAD_MAGIC;
writewrap(rng, (const char*)&h, sizeof(h));
/* store buffers in ringbuf */
while ((buff = va_arg(ap, char *)) != NULL)
{
size_t s = va_arg(ap, size_t);
writewrap(rng, buff, s);
}
writewrap(rng, (const char*)&t, sizeof(t));
return msgsize;
}
