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glibc  2.9
Functions
td_ta_event_getmsg.c File Reference
#include <stddef.h>
#include <string.h>
#include "thread_dbP.h"
#include <linuxthreads/internals.h>

Go to the source code of this file.

Functions

td_err_e td_ta_event_getmsg (const td_thragent_t *ta, td_event_msg_t *msg)

Function Documentation

td_err_e td_ta_event_getmsg ( const td_thragent_t *  ta,
td_event_msg_t msg 
)

Definition at line 29 of file td_ta_event_getmsg.c.

{
  /* XXX I cannot think of another way but using a static variable.  */
  static td_thrhandle_t th;
  td_eventbuf_t event;
  psaddr_t addr;

  LOG ("td_ta_event_getmsg");

  /* Test whether the TA parameter is ok.  */
  if (! ta_ok (ta))
    return TD_BADTA;

  /* Get the pointer to the thread descriptor with the last event.  */
  if (ps_pdread (ta->ph, ta->pthread_last_event,
               &addr, sizeof (void *)) != PS_OK)
    return TD_ERR;   /* XXX Other error value?  */

  /* If the pointer is NULL no event occurred.  */
  if (addr == 0)
    return TD_NOMSG;

  /* Read the even structure from the target.  */
  if (ps_pdread (ta->ph,
               ((char *) addr
                + offsetof (struct _pthread_descr_struct, p_eventbuf)),
               &event, sizeof (td_eventbuf_t)) != PS_OK)
    return TD_ERR;   /* XXX Other error value?  */

  /* Check whether an event occurred.  */
  if (event.eventnum == TD_EVENT_NONE)
    {
      /* Oh well, this means the last event was already read.  So
        we have to look for any other event.  */
      struct pthread_handle_struct handles[ta->pthread_threads_max];
      int num;
      int i;

      /* Read the number of currently active threads.  */
      if (ps_pdread (ta->ph, ta->pthread_handles_num, &num, sizeof (int))
         != PS_OK)
       return TD_ERR;       /* XXX Other error value?  */

      /* Now read the handles.  */
      if (ps_pdread (ta->ph, ta->handles, handles,
                   ta->pthread_threads_max * sizeof (handles[0])) != PS_OK)
       return TD_ERR;       /* XXX Other error value?  */

      for (i = 0; i < ta->pthread_threads_max && num > 0; ++i)
       {
         if (handles[i].h_descr == NULL)
           /* No entry here.  */
           continue;

         /* First count this active thread.  */
         --num;

         if (handles[i].h_descr == addr)
           /* We already handled this.  */
           continue;

         /* Read the event data for this thread.  */
         if (ps_pdread (ta->ph,
                      ((char *) handles[i].h_descr
                       + offsetof (struct _pthread_descr_struct,
                                  p_eventbuf)),
                      &event, sizeof (td_eventbuf_t)) != PS_OK)
           return TD_ERR;

         if (event.eventnum != TD_EVENT_NONE)
           {
             /* We found a thread with an unreported event.  */
             addr = handles[i].h_descr;
             break;
           }
       }

      /* If we haven't found any other event signal this to the user.  */
      if (event.eventnum == TD_EVENT_NONE)
       return TD_NOMSG;
    }

  /* Generate the thread descriptor.  */
  th.th_ta_p = (td_thragent_t *) ta;
  th.th_unique = addr;

  /* Fill the user's data structure.  */
  msg->event = event.eventnum;
  msg->th_p = &th;
  msg->msg.data = (uintptr_t) event.eventdata;

  /* And clear the event message in the target.  */
  memset (&event, '\0', sizeof (td_eventbuf_t));
  if (ps_pdwrite (ta->ph,
                ((char *) addr
                 + offsetof (struct _pthread_descr_struct, p_eventbuf)),
                &event, sizeof (td_eventbuf_t)) != PS_OK)
    return TD_ERR;   /* XXX Other error value?  */

  return TD_OK;
}