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80 lines
2.4 KiB
C
80 lines
2.4 KiB
C
/* Map thread ID to thread handle.
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Copyright (C) 1999, 2001, 2002 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@cygnus.com>, 1999.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include "thread_dbP.h"
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#include <linuxthreads/internals.h>
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td_err_e
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td_ta_map_id2thr (const td_thragent_t *ta, pthread_t pt, td_thrhandle_t *th)
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{
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struct pthread_handle_struct phc;
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struct _pthread_descr_struct pds;
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int pthread_threads_max;
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LOG ("td_ta_map_id2thr");
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/* Test whether the TA parameter is ok. */
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if (! ta_ok (ta))
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return TD_BADTA;
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/* Make the following expression a bit smaller. */
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pthread_threads_max = ta->pthread_threads_max;
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/* We can compute the entry in the handle array we want. */
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if (ps_pdread (ta->ph, ta->handles + pt % pthread_threads_max, &phc,
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sizeof (struct pthread_handle_struct)) != PS_OK)
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return TD_ERR; /* XXX Other error value? */
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/* Test whether this entry is in use. */
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if (phc.h_descr == NULL)
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{
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if (pt % pthread_threads_max == 0)
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{
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/* The initial thread always exists but the thread library
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might not yet be initialized. */
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th->th_ta_p = (td_thragent_t *) ta;
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th->th_unique = NULL;
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return TD_OK;
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}
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return TD_BADTH;
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}
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/* Next test: get the descriptor to see whether this is not an old
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thread handle. */
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if (ps_pdread (ta->ph, phc.h_descr, &pds,
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sizeof (struct _pthread_descr_struct)) != PS_OK)
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return TD_ERR; /* XXX Other error value? */
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if (pds.p_tid != pt)
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return TD_BADTH;
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if (pds.p_terminated != 0)
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return TD_NOTHR;
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/* Create the `td_thrhandle_t' object. */
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th->th_ta_p = (td_thragent_t *) ta;
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th->th_unique = phc.h_descr;
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return TD_OK;
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}
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