diff options
Diffstat (limited to 'storage/xtradb/sync/sync0sync.c')
| -rw-r--r-- | storage/xtradb/sync/sync0sync.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/storage/xtradb/sync/sync0sync.c b/storage/xtradb/sync/sync0sync.c index 25f96d9817a..948d211bc03 100644 --- a/storage/xtradb/sync/sync0sync.c +++ b/storage/xtradb/sync/sync0sync.c @@ -44,6 +44,7 @@ Created 9/5/1995 Heikki Tuuri # include "srv0start.h" /* srv_is_being_started */ #endif /* UNIV_SYNC_DEBUG */ #include "ha_prototypes.h" +#include "my_cpu.h" /* REASONS FOR IMPLEMENTING THE SPIN LOCK MUTEX @@ -481,6 +482,8 @@ mutex_set_waiters( ptr = &(mutex->waiters); + os_wmb; + *ptr = n; /* Here we assume that the write of a single word in memory is atomic */ #endif @@ -523,13 +526,15 @@ mutex_loop: spin_loop: ut_d(mutex->count_spin_loop++); + HMT_low(); while (mutex_get_lock_word(mutex) != 0 && i < SYNC_SPIN_ROUNDS) { if (srv_spin_wait_delay) { ut_delay(ut_rnd_interval(0, srv_spin_wait_delay)); } - + os_rmb; // Ensure future reads sees new values i++; } + HMT_medium(); if (i == SYNC_SPIN_ROUNDS) { #ifdef UNIV_DEBUG |