niklas/cyclonedds
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

IID generator: init and atomic64 ops (#270)

Browse source 
Signed-off-by: Erik Boasson <eb@ilities.com>
This commit is contained in:
Erik Boasson 2019-10-07 16:40:21 +02:00 • committed by eboasson
parent cbc6dc5aa0
commit 8ce389dd85
2 changed files with 7 additions and 32 deletions
Download patch file Download diff file Expand all files Collapse all files

5
src/core/ddsi/include/dds/ddsi/ddsi_iid.h
View file

@ -21,12 +21,7 @@ extern "C" {
#endif
struct ddsi_iid {
#if DDSRT_ATOMIC64_SUPPORT
ddsrt_atomic_uint64_t counter;
#else
ddsrt_mutex_t lock;
uint64_t counter;
#endif
uint32_t key[4];
};

34
src/core/ddsi/src/ddsi_iid.c
View file

@ -15,7 +15,7 @@
#include "dds/ddsrt/sync.h"
#include "dds/ddsi/ddsi_iid.h"
static struct ddsi_iid dds_iid;
static struct ddsi_iid ddsi_iid;
static void dds_tea_encrypt (uint32_t v[2], const uint32_t k[4])
{
@ -48,16 +48,8 @@ uint64_t ddsi_iid_gen (void)
{
uint64_t iid;
union { uint64_t u64; uint32_t u32[2]; } tmp;
#if DDSRT_ATOMIC64_SUPPORT
tmp.u64 = ddsrt_atomic_inc64_nv (&dds_iid.counter);
#else
ddsrt_mutex_lock (&dds_iid.lock);
tmp.u64 = ++dds_iid.counter;
ddsrt_mutex_unlock (&dds_iid.lock);
#endif
dds_tea_encrypt (tmp.u32, dds_iid.key);
tmp.u64 = ddsrt_atomic_inc64_nv (&ddsi_iid.counter);
dds_tea_encrypt (tmp.u32, ddsi_iid.key);
iid = tmp.u64;
return iid;
}
@ -65,26 +57,14 @@ uint64_t ddsi_iid_gen (void)
void ddsi_iid_init (void)
{
union { uint64_t u64; uint32_t u32[2]; } tmp;
#if ! DDSRT_ATOMIC64_SUPPORT
ddsrt_mutex_init (&dds_iid.lock);
#endif
for (size_t i = 0; i < sizeof (dds_iid.key) / sizeof (dds_iid.key[0]); i++)
dds_iid.key[0] = ddsrt_random ();
for (size_t i = 0; i < sizeof (ddsi_iid.key) / sizeof (ddsi_iid.key[0]); i++)
ddsi_iid.key[i] = ddsrt_random ();
tmp.u64 = 0;
dds_tea_decrypt (tmp.u32, dds_iid.key);
#if DDSRT_ATOMIC64_SUPPORT
ddsrt_atomic_st64 (&dds_iid.counter, tmp.u64);
#else
dds_iid.counter = tmp.u64;
#endif
dds_tea_decrypt (tmp.u32, ddsi_iid.key);
ddsrt_atomic_st64 (&ddsi_iid.counter, tmp.u64);
}
void ddsi_iid_fini (void)
{
#if ! DDSRT_ATOMIC64_SUPPORT
ddsrt_mutex_destroy (&dds_iid.lock);
#endif
}