iofunc_unblock_default()

Default unblock handler

Synopsis:

#include <sys/iofunc.h>

int iofunc_unblock_default( resmgr_context_t * ctp,
                            io_pulse_t * msg,
                            iofunc_ocb_t * ocb );

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 calls iofunc_unblock().

The iofunc_unblock_default() function implements the functionality required when the client requests to be unblocked (e.g. a signal or timeout).

You can place this function directly into the io_funcs table passed 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 you're calling iofunc_lock_default(), your unblock handler should call iofunc_unblock_default():

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

/* Do your own thing to look for a client to unblock */

Classification:

QNX Neutrino

See also:

iofunc_func_init(), iofunc_lock_default(), iofunc_ocb_t, resmgr_attach(), resmgr_context_t, resmgr_io_funcs_t

Writing a Resource Manager

Resource Managers chapter of Getting Started with QNX Neutrino