/** \brief Dump content of a ring buffer
*
* \param[in] rng Ring buffer
* \param[in] dump_msg_fn Function used to dump a message
*/
void
examsgRngDump(exa_ringbuf_t *rng, ExaRingDumpMsgFn dump_msg_fn)
{
unsigned char *data = (unsigned char *)rng->data;
int pRd, pWr;
struct examsg_blkhead h;
examsg_blktail t;
int mc;
/* dump general stats */
exalog_trace("ring buffer %p, read %d, write %d, size %" PRIzu,
rng, rng->pRd, rng->pWr, rng->size);
if (rng->pRd == rng->pWr)
{
exalog_trace("EMPTY");
return;
}
/* save content of ring buffer */
pRd = rng->pRd;
pWr = rng->pWr;
/* iterate over messages */
mc = 0;
while (rng->pRd != rng->pWr)
{
mc++;
/* read header */
readwrap(rng, (char *)&h, sizeof(h));
if (dump_msg_fn)
dump_msg_fn(mc, data + rng->pRd, h.size);
rng->pRd = (rng->pRd + h.size) % rng->size;
readwrap(rng, (char*)&t, sizeof(t));
}
/* restore buffer */
rng->pRd = pRd;
rng->pWr = pWr;
}
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
examsgRngGetVaList(exa_ringbuf_t *rng, va_list ap)
{
va_list ap2;
struct examsg_blkhead h;
examsg_blktail t;
int r, avail;
size_t maxbytes = 0;
char *buff;
/* sanity checks */
EXA_ASSERT(rng);
EXA_ASSERT(rng->magic == EXAMSG_RNG_MAGIC);
if (rng->pWr == rng->pRd)
return 0; /* no message */
/* compute max read size */
if (rng->pRd < rng->pWr)
avail = rng->pWr - rng->pRd;
else
avail = rng->size - rng->pRd + rng->pWr;
/* read header */
r = rng->pRd;
EXA_ASSERT(avail > sizeof(h));
readwrap(rng, (char *)&h, sizeof(h));
EXA_ASSERT(h.magic == EXAMSG_HEAD_MAGIC);
EXA_ASSERT(h.size > 0);
/* enough place? */
EXA_ASSERT(avail >= h.size + sizeof(h) + sizeof(t));
/* save the va list as it is resued later in the function */
va_copy(ap2, ap);
/* compute total size of provided buffers */
while (va_arg(ap2, void *) != NULL)
maxbytes += va_arg(ap2, size_t);
/* Check buffer size if a buffer is provided */
if (h.size > maxbytes)
{
/* restore read pointer (let buffer in ring) */
rng->pRd = r;
return -EMSGSIZE;
}
/* The number of bytes to available is put in maxbytes */
maxbytes = h.size;
/* compute total size of provided buffers */
while ((buff = va_arg(ap, char *)) != NULL)
{
size_t s = va_arg(ap, size_t);
readwrap(rng, buff, s < maxbytes ? s: maxbytes);
if (maxbytes <= s)
break;
maxbytes -= s;
}
readwrap(rng, (char*)&t, sizeof(t));
EXA_ASSERT(!examsg_blktail_check(&t));
return h.size;
}
