resmgr_context_alloc()

Allocate a resource-manager context

Synopsis:

#include <sys/iofunc.h>
#include <sys/dispatch.h>

resmgr_context_t * resmgr_context_alloc
                 ( dispatch_t * dpp );

Arguments:

dpp

A dispatch handle created by dispatch_create().

Library:

libc

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

Description:

The resmgr_context_alloc() function returns a context that's used for blocking and receiving messages.

---

This function is a special case of dispatch_context_alloc(). You should use it only when writing a simple resource manager.

---

Returns:

A pointer to a resmgr_context_t structure, or NULL if an error occurs (errno is set).

Errors:

EINVAL

No resource manager events were attached to dpp.

ENOMEM

Insufficient memory to allocate the context ctp.

Examples:

#include <sys/dispatch.h>
#include <stdio.h>
#include <stdlib.h>

int main( int argc, char **argv ) {
   dispatch_t          *dpp;
   resmgr_context_t    *ctp;

   if ( (dpp = dispatch_create()) == NULL ) {
      fprintf( stderr, "%s: Unable to allocate \
               dispatch handle.\n",argv[0] );
      return EXIT_FAILURE;
   }

   …

   if ( ( ctp = resmgr_context_alloc ( dpp )) == NULL ) {
      fprintf( stderr, "Context wasn't allocated.\n" );
      return EXIT_FAILURE;
   }
}

For examples using the dispatch interface, see dispatch_create(), message_attach(), resmgr_attach(), and thread_pool_create().

Classification:

QNX Neutrino

See also:

dispatch_context_alloc(), dispatch_create(), resmgr_attach(), resmgr_context_free(), resmgr_context_t

“Layers in a resource manager” in the Bones of a Resource Manager chapter of Writing a Resource Manager

Resource Managers chapter of Getting Started with QNX Neutrino