NAME

       gearman_worker_define_function - Gearmand Documentation, http://gearman.info/

SYNOPSIS

       #include <libgearman/gearman.h>

       gearman_function_t

       gearman_return_t      gearman_worker_define_function(gearman_worker_st *worker,      const
       char *function_name, const size_t function_name_length, const gearman_function_t function,
       const uint32_t timeout, void *context)

       gearman_function_fn

       gearman_aggregator_fn

       Link with -lgearman

DESCRIPTION

       gearman_worker_define_function() defines functions for a worker.

       The  interface  is  callback  by  design.  When  the  server  has  a  job  for the worker,
       gearman_function_fn is evoked with a gearman_job_st representing the job, and the  context
       that was defined originally when the function was defined.

       Results are sent back to the client by invoking gearman_job_send_data().

       If  the  client  specified an reducer function, then the output of the gearman_function_fn
       will be sent to that function. You can split the work  out  to  the  reducer  function  by
       sending data multiple times with gearman_job_send_data().

       If  any  errors  are detected then the entire job is cancelled.  The gearman_aggregator_fn
       will be called when all mapped jobs have completed. The result of this  function  will  be
       what is returned to the client.

       The callback function needs to return one of the following errors:

       GEARMAN_SUCCESS

       The function was successful.

       GEARMAN_FAIL

       An error has occurred, the job we not processed, and the worker cannot continue.

       GEARMAN_ERROR

       A transient error has occurred, like a network failure, and the job can be restarted.

       If  a  value  other  then  the  above  are  returned it is converted to a GEARMAN_FAIL and
       gearman_worker_work() returns GEARMAN_INVALID_ARGUMENT.

       gearman_job_send_complete() and gearman_job_send_fail() cannot be used with any  functions
       created with gearman_worker_define_function().

RETURN VALUE

       gearman_return_t

HOME

       To find out more information please check: http://gearman.info/

SEE ALSO

       gearmand(8)         libgearman(3)         gearman_strerror(3)         gearman_client_error
       gearman_client_execute_reduce

AUTHOR

       Data Differential http://www.datadifferential.com/

COPYRIGHT

       2011-2017, Data Differential, http://www.datadifferential.com/