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FT-584 use trylock inside of the lock tree manager get_status function so that it is non-blocking

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This commit is contained in:
Rich Prohaska 2014-08-22 07:57:47 -04:00
parent 8fc7c28874
commit 61195094c7
2 changed files with 34 additions and 19 deletions
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38
locktree/manager.cc
View file

@ -598,33 +598,33 @@ void locktree::manager::get_status(LTM_STATUS statp) {
STATUS_VALUE(LTM_LONG_WAIT_ESCALATION_COUNT) = m_long_wait_escalation_count;
STATUS_VALUE(LTM_LONG_WAIT_ESCALATION_TIME) = m_long_wait_escalation_time;
mutex_lock();
uint64_t lock_requests_pending = 0;
uint64_t sto_num_eligible = 0;
uint64_t sto_end_early_count = 0;
tokutime_t sto_end_early_time = 0;
struct lt_counters lt_counters = m_lt_counters;
size_t num_locktrees = m_locktree_map.size();
for (size_t i = 0; i < num_locktrees; i++) {
locktree *lt;
int r = m_locktree_map.fetch(i, &lt);
invariant_zero(r);
size_t num_locktrees = 0;
struct lt_counters lt_counters = {};
toku_mutex_lock(&lt->m_lock_request_info.mutex);
lock_requests_pending += lt->m_lock_request_info.pending_lock_requests.size();
add_lt_counters(&lt_counters, &lt->m_lock_request_info.counters);
toku_mutex_unlock(&lt->m_lock_request_info.mutex);
sto_num_eligible += lt->sto_txnid_is_valid_unsafe() ? 1 : 0;
sto_end_early_count += lt->m_sto_end_early_count;
sto_end_early_time += lt->m_sto_end_early_time;
if (toku_mutex_trylock(&m_mutex) == 0) {
lt_counters = m_lt_counters;
num_locktrees = m_locktree_map.size();
for (size_t i = 0; i < num_locktrees; i++) {
locktree *lt;
int r = m_locktree_map.fetch(i, &lt);
invariant_zero(r);
if (toku_mutex_trylock(&lt->m_lock_request_info.mutex) == 0) {
lock_requests_pending += lt->m_lock_request_info.pending_lock_requests.size();
add_lt_counters(&lt_counters, &lt->m_lock_request_info.counters);
toku_mutex_unlock(&lt->m_lock_request_info.mutex);
}
sto_num_eligible += lt->sto_txnid_is_valid_unsafe() ? 1 : 0;
sto_end_early_count += lt->m_sto_end_early_count;
sto_end_early_time += lt->m_sto_end_early_time;
}
mutex_unlock();
}
mutex_unlock();
STATUS_VALUE(LTM_NUM_LOCKTREES) = num_locktrees;
STATUS_VALUE(LTM_LOCK_REQUESTS_PENDING) = lock_requests_pending;
STATUS_VALUE(LTM_STO_NUM_ELIGIBLE) = sto_num_eligible;

15
portability/toku_pthread.h
View file

@ -213,6 +213,21 @@ toku_mutex_lock(toku_mutex_t *mutex) {
#endif
}
static inline int
toku_mutex_trylock(toku_mutex_t *mutex) {
int r = pthread_mutex_trylock(&mutex->pmutex);
#if TOKU_PTHREAD_DEBUG
if (r == 0) {
invariant(mutex->valid);
invariant(!mutex->locked);
invariant(mutex->owner == 0);
mutex->locked = true;
mutex->owner = pthread_self();
}
#endif
return r;
}
static inline void
toku_mutex_unlock(toku_mutex_t *mutex) {
#if TOKU_PTHREAD_DEBUG