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Add a mechanism to synchronize persistent pool counts

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The polling system now has a concept of messages. This can be used to send
a synchronous message to the polling system which waits for all threads to
process the message before returning.

Currently this is used to flush unused DCBs when server persistent
statistics are reported.
This commit is contained in:
Markus Makela
2016-11-26 08:19:36 +02:00
parent 8573df6ee7
commit 7cbbc6f8f7
4 changed files with 75 additions and 4 deletions
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6
include/maxscale/poll.h
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@ -52,6 +52,11 @@ typedef enum
POLL_STAT_MAX_EXECTIME
} POLL_STAT;
enum poll_message
{
POLL_MSG_CLEAN_PERSISTENT = 0x01
};
extern void poll_init();
extern int poll_add_dcb(DCB *);
extern int poll_remove_dcb(DCB *);
@ -71,5 +76,6 @@ extern void poll_fake_event(DCB *dcb, enum EPOLL_EVENTS ev);
extern void poll_fake_hangup_event(DCB *dcb);
extern void poll_fake_write_event(DCB *dcb);
extern void poll_fake_read_event(DCB *dcb);
extern void poll_send_message(enum poll_message msg, void *data);
MXS_END_DECLS