diff options
Diffstat (limited to 'src/backend/utils/activity/wait_event.c')
| -rw-r--r-- | src/backend/utils/activity/wait_event.c | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/src/backend/utils/activity/wait_event.c b/src/backend/utils/activity/wait_event.c index 4b9b5c01cbe..4e112560da1 100644 --- a/src/backend/utils/activity/wait_event.c +++ b/src/backend/utils/activity/wait_event.c @@ -265,6 +265,46 @@ GetWaitEventExtensionIdentifier(uint16 eventId) /* + * Returns a list of currently defined custom wait event names for extensions. + * The result is a palloc'd array, with the number of elements saved in + * *nwaitevents. + */ +char ** +GetWaitEventExtensionNames(int *nwaitevents) +{ + char **waiteventnames; + WaitEventExtensionEntryByName *hentry; + HASH_SEQ_STATUS hash_seq; + int index; + int els; + + LWLockAcquire(WaitEventExtensionLock, LW_SHARED); + + /* Now we can safely count the number of entries */ + els = hash_get_num_entries(WaitEventExtensionHashByName); + + /* Allocate enough space for all entries */ + waiteventnames = palloc(els * sizeof(char *)); + + /* Now scan the hash table to copy the data */ + hash_seq_init(&hash_seq, WaitEventExtensionHashByName); + + index = 0; + while ((hentry = (WaitEventExtensionEntryByName *) hash_seq_search(&hash_seq)) != NULL) + { + waiteventnames[index] = pstrdup(hentry->wait_event_name); + index++; + } + + LWLockRelease(WaitEventExtensionLock); + + Assert(index == els); + + *nwaitevents = index; + return waiteventnames; +} + +/* * Configure wait event reporting to report wait events to *wait_event_info. * *wait_event_info needs to be valid until pgstat_reset_wait_event_storage() * is called. |