Additional thread

[James Devine]

Is it possible for me to spin off my own thread to do background work
separate from individual requests in a module?  I am trying to start a
thread from the instantiate call and then rejoin on the detach, this seems
to work when I run radius -X, but something is happening when radius is not
in debug so that it gets stuck or killed somehow, the log statement is only
logged once.

All I have is a while loop with a log and sleep statement in it as shown
below.  It is not getting stuck in the log call as even without that,
sending a sigterm to the process still hangs.









#include <freeradius/ident.h>
RCSID("$Id$")

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <pthread.h>


#include <freeradius-devel/radiusd.h>
#include <freeradius-devel/modules.h>








typedef struct rlm_gwis_t {
  int shutdown;
  pthread_t p_thread;
} gw_config;







const CONF_PARSER module_config[] = {
  { NULL, -1, 0, NULL, NULL }           /* end the list */
};










void *gwis__background__start(void *data) {
  gw_config *gwd = data;

  if(!gwd)
    return NULL;

  while(!gwd->shutdown) {
    radlog(L_ERR, "Background process, shutdown %d", gwd->shutdown);
    sleep(1);
  }

  return NULL;
}







static int gwis_detach(void *gwd) {

  if(gwd) {
    ((gw_config *)gwd)->shutdown = 1;

    pthread_join(((gw_config *)gwd)->p_thread, NULL);
    free(gwd);
  }

  return RLM_MODULE_OK;
}









static int gwis_instantiate(CONF_SECTION *conf, void **gwd) {
  gw_config *tmp_gwd;

  tmp_gwd = rad_malloc(sizeof(gw_config));
  if(!tmp_gwd) {
    return RLM_MODULE_FAIL;
  }
  memset(tmp_gwd, 0, sizeof(gw_config));

  if(cf_section_parse(conf, tmp_gwd, module_config) < 0) {
    free(tmp_gwd);
    return RLM_MODULE_FAIL;
  }

  tmp_gwd->shutdown = 0;
  if(pthread_create(&tmp_gwd->p_thread, NULL, gwis__background__start,
tmp_gwd)) {
    gwis_detach(tmp_gwd);
    return -1;
  }

  *gwd = tmp_gwd;

  return RLM_MODULE_OK;
}








static int gwis_preacct(void *gwd, REQUEST *request) {
  return RLM_MODULE_OK;
}







module_t rlm_gwis = {
  RLM_MODULE_INIT,
  "gwis",
  RLM_TYPE_THREAD_SAFE,
  gwis_instantiate,
  gwis_detach,
  {
    NULL,
    NULL,
    gwis_preacct,
    NULL,
    NULL,
    NULL,
    NULL,
    NULL
  },
};
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