diff options
Diffstat (limited to 'mysys/my_uuid.c')
| -rw-r--r-- | mysys/my_uuid.c | 14 |
1 files changed, 9 insertions, 5 deletions
diff --git a/mysys/my_uuid.c b/mysys/my_uuid.c index 0c4d34ace8b..ab1b259ae0f 100644 --- a/mysys/my_uuid.c +++ b/mysys/my_uuid.c @@ -47,9 +47,10 @@ static my_bool my_uuid_inited= 0; static struct my_rnd_struct uuid_rand; static uint nanoseq; static ulonglong uuid_time= 0; +static longlong interval_timer_offset; static uchar uuid_suffix[2+6]; /* clock_seq and node */ -mysql_mutex_t LOCK_uuid_generator; +static mysql_mutex_t LOCK_uuid_generator; /* Number of 100-nanosecond intervals between @@ -68,6 +69,8 @@ static void set_clock_seq() { uint16 clock_seq= ((uint)(my_rnd(&uuid_rand)*16383)) | UUID_VARIANT; mi_int2store(uuid_suffix, clock_seq); + interval_timer_offset= (my_hrtime().val * 10 - my_interval_timer()/100 + + UUID_TIME_OFFSET); } @@ -91,7 +94,7 @@ void my_uuid_init(ulong seed1, ulong seed2) if (my_uuid_inited) return; my_uuid_inited= 1; - now= my_getsystime(); + now= my_interval_timer()/100 + interval_timer_offset; nanoseq= 0; if (my_gethwaddr(mac)) @@ -132,7 +135,7 @@ void my_uuid(uchar *to) DBUG_ASSERT(my_uuid_inited); mysql_mutex_lock(&LOCK_uuid_generator); - tv= my_getsystime() + UUID_TIME_OFFSET + nanoseq; + tv= my_interval_timer()/100 + interval_timer_offset + nanoseq; if (likely(tv > uuid_time)) { @@ -185,7 +188,7 @@ void my_uuid(uchar *to) irrelevant in the new numberspace. */ set_clock_seq(); - tv= my_getsystime() + UUID_TIME_OFFSET; + tv= my_interval_timer()/100 + interval_timer_offset; nanoseq= 0; DBUG_PRINT("uuid",("making new numberspace")); } @@ -226,7 +229,8 @@ void my_uuid2str(const uchar *guid, char *s) { *s++= _dig_vec_lower[guid[i] >>4]; *s++= _dig_vec_lower[guid[i] & 15]; - if(i == 3 || i == 5 || i == 7 || i == 9) + /* Set '-' at intervals 3, 5, 7 and 9 */ + if ((1 << i) & ((1 << 3) | (1 << 5) | (1 << 7) | (1 << 9))) *s++= '-'; } } |