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[/] [openrisc/] [trunk/] [gnu-stable/] [newlib-1.18.0/] [newlib/] [libc/] [sys/] [linux/] [linuxthreads/] [td_ta_event_getmsg.c] - Rev 859
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/* Retrieve event. Copyright (C) 1999 Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Ulrich Drepper <drepper@cygnus.com>, 1999. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. The GNU C Library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with the GNU C Library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. */ #include <stddef.h> #include <string.h> #include "thread_dbP.h" td_err_e td_ta_event_getmsg (const td_thragent_t *ta, td_event_msg_t *msg) { /* 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; }
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