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This can be used implement a generic per thread impersonation
for thread pools.
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>
This can be used to check if worker threads run with
unshare(CLONE_FS).
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>
In the direction from the main process to the job thread, we have:
- 'maycancel', which is set when tevent_req_cancel() is called,
- 'orphaned' is the job request, tevent_context or pthreadpool_tevent
was talloc_free'ed.
The job function can consume these by using:
/*
* return true - if tevent_req_cancel() was called.
*/
bool pthreadpool_tevent_current_job_canceled(void);
/*
* return true - if talloc_free() was called on the job request,
* tevent_context or pthreadpool_tevent.
*/
bool pthreadpool_tevent_current_job_orphaned(void);
/*
* return true if canceled and orphaned are both false.
*/
bool pthreadpool_tevent_current_job_continue(void);
In the other direction we remember the following points
in the job execution:
- 'started' - set when the job is picked up by a worker thread
- 'executed' - set once the job function returned.
- 'finished' - set when pthreadpool_tevent_job_signal() is entered
- 'dropped' - set when pthreadpool_tevent_job_signal() leaves with orphaned
- 'signaled' - set when pthreadpool_tevent_job_signal() leaves normal
There're only one side writing each element,
either the main process or the job thread.
This means we can do the coordination with a full memory
barrier using atomic_thread_fence(memory_order_seq_cst).
lib/replace provides fallbacks if C11 stdatomic.h is not available.
A real pthreadpool requires pthread and atomic_thread_fence() (or an
replacement) to be available, otherwise we only have pthreadpool_sync.c.
But this should not make a real difference, as at least
__sync_synchronize() is availabe since 2005 in gcc.
We also require __thread which is available since 2002.
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>
Instead of leaking the memory forever, we retry the cleanup,
if other pthreadpool_tevent_*() functions are used.
pthreadpool_tevent_cleanup_orphaned_jobs() could also be called
by external callers.
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>
These can be used to implement some kind of flow control in the caller.
E.g. unless pthreadpool_tevent_queued_jobs() is lower than
pthreadpool_tevent_max_threads() is good to prepare new jobs.
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>
