iofunc_unblock_default()

Arguments:

ctp

A pointer to a resmgr_context_t structure that the resource-manager library uses to pass context information between functions.

msg

A pointer to the io_pulse_t structure that describes the pulse that the resource manager received.

ocb

A pointer to the iofunc_ocb_t structure for the Open Control Block that was created when the client opened the resource.

Library:

libc

Use the -l c option to qcc to link against this library. This library is usually included automatically.

Description:

The iofunc_unblock_default() function is the default routine that a resource manager calls when a client requests to be unblocked (e.g., because of a signal or timeout). It unblocks any clients that are blocked on any internal resource manager structures, calling iofunc_unblock() to do the actual work.

You can place this function directly into the resmgr_io_funcs_t table passed as the io_funcs argument to resmgr_attach(), at the unblock position, or you can call iofunc_func_init() to initialize all of the functions to their default values.

The unblock message is synthesized by the resource-manager shared library when a client wishes to unblock from its MsgSendv() to the resource manager. The iofunc_unblock_default() function takes care of freeing up any locks that the client may have placed on the resource.

Returns:

_RESMGR_DEFAULT

No client connection was found.

_RESMGR_NOREPLY

A client connection has been unblocked.

Examples:

If your lock handler called iofunc_lock_default(), your unblock handler must call iofunc_unblock_default():

int my_unblock_handler (resmgr_context_t *ctp, io_pulse_t *msg, RESMGR_OCB_T *ocb)
{
   int status;

   if((status = iofunc_unblock_default(...)) != _RESMGR_DEFAULT)
   {
      return status;
   }

   /* Do any additional work required to look for a client to unblock. */
   ...
}

Classification:

QNX OS