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MXS-1754 Reintroduce maxscale::Worker

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Worker is now the base class of all workers. It has a message
queue and can be run in a thread of its own, or in the calling
thread. Worker can not be used as such, but a concrete worker
class must be derived from it. Currently there is only one
concrete class RoutingWorker.

There is some overlapping in functionality between Worker and
RoutingWorker, as there is e.g. a need for broadcasting a
message to all routing workers, but not to other workers.

Currently other workers can not be created as the array for
holding the pointers to the workers is exactly as large as
there will be RoutingWorkers. That will be changed so that
the maximum number of threads is hardwired to some ridiculous
value such as 128. That's the first step in the path towards
a situation where the number of worker threads can be changed
at runtime.
This commit is contained in:
Johan Wikman
2018-04-13 09:51:27 +03:00
parent 230876cd69
commit b36f6faa7e
19 changed files with 2338 additions and 1892 deletions
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14
server/core/internal/messagequeue.hh
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@ -19,7 +19,7 @@ namespace maxscale
{
class MessageQueue;
class RoutingWorker;
class Worker;
/**
* An instance of @c MessageQueueMessage can be sent over a @c MessageQueue from
@ -180,7 +180,7 @@ public:
* @attention If the message queue is currently added to a worker, it
* will first be removed from that worker.
*/
bool add_to_worker(RoutingWorker* pWorker);
bool add_to_worker(Worker* pWorker);
/**
* Removes the message queue from the worker it is currently added to.
@ -188,7 +188,7 @@ public:
* @return The worker the message queue was associated with, or NULL
* if it was not associated with any.
*/
RoutingWorker* remove_from_worker();
Worker* remove_from_worker();
private:
MessageQueue(Handler* pHandler, int read_fd, int write_fd);
@ -198,10 +198,10 @@ private:
static uint32_t poll_handler(MXS_POLL_DATA* pData, int thread_id, uint32_t events);
private:
Handler& m_handler;
int m_read_fd;
int m_write_fd;
RoutingWorker* m_pWorker;
Handler& m_handler;
int m_read_fd;
int m_write_fd;
Worker* m_pWorker;
};
}