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3082244d35
(add_thread): Cast return value from xmalloc.
236 lines
4.8 KiB
C
236 lines
4.8 KiB
C
/* Multi-process/thread control for GDB, the GNU debugger.
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Copyright 1986, 1987, 1988, 1993
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Contributed by Lynx Real-Time Systems, Inc. Los Gatos, CA.
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Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program 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
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
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#include "defs.h"
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#include "symtab.h"
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#include "frame.h"
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#include "inferior.h"
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#include "environ.h"
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#include "value.h"
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#include "target.h"
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#include "thread.h"
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#include <sys/types.h>
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#include <signal.h>
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/*#include "lynxos-core.h"*/
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struct thread_info
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{
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struct thread_info *next;
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int pid; /* Actual process id */
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int num; /* Convenient handle */
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};
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static struct thread_info *thread_list = NULL;
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static int highest_thread_num;
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static void thread_info PARAMS ((void));
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static void thread_command PARAMS ((char * tidstr, int from_tty));
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static void prune_threads PARAMS ((void));
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static void thread_switch PARAMS ((int pid));
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void
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init_thread_list ()
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{
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struct thread_info *tp, *tpnext;
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if (!thread_list)
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return;
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for (tp = thread_list; tp; tp = tpnext)
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{
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tpnext = tp->next;
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free (tp);
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}
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thread_list = NULL;
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highest_thread_num = 0;
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}
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void
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add_thread (pid)
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int pid;
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{
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struct thread_info *tp;
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tp = (struct thread_info *) xmalloc (sizeof (struct thread_info));
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tp->pid = pid;
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tp->num = ++highest_thread_num;
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tp->next = thread_list;
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thread_list = tp;
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}
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static struct thread_info *
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find_thread_id (num)
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int num;
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{
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struct thread_info *tp;
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for (tp = thread_list; tp; tp = tp->next)
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if (tp->num == num)
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return tp;
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return NULL;
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}
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int
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in_thread_list (pid)
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int pid;
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{
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struct thread_info *tp;
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for (tp = thread_list; tp; tp = tp->next)
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if (tp->pid == pid)
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return 1;
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return 0; /* Never heard of 'im */
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}
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#if 0
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void
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bfd_get_core_threads (abfd)
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bfd *abfd;
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{
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int i;
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inferior_pid = BUILDPID (inferior_pid, core_thread (abfd)->pid);
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for (i = 0; i < core_pss (abfd).threadcnt; i++)
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add_thread (core_thread (abfd)[i].pid);
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}
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#endif
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static void
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prune_threads ()
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{
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struct thread_info *tp, *tpprev;
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tpprev = 0;
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for (tp = thread_list; tp; tp = tp->next)
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if (tp->pid == -1)
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{
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if (tpprev)
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tpprev->next = tp->next;
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else
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thread_list = NULL;
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free (tp);
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}
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else
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tpprev = tp;
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}
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/* Print information about currently known threads */
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static void
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info_threads_command (arg, from_tty)
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char *arg;
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int from_tty;
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{
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struct thread_info *tp;
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int current_pid = inferior_pid;
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for (tp = thread_list; tp; tp = tp->next)
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{
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if (target_has_execution
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&& kill (tp->pid, 0) == -1)
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{
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tp->pid == -1; /* Mark it as dead */
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continue;
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}
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if (tp->pid == current_pid)
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printf_filtered ("* ");
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else
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printf_filtered (" ");
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printf_filtered ("%d %s ", tp->num, target_pid_to_str (tp->pid));
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thread_switch (tp->pid);
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print_stack_frame (selected_frame, -1, 0);
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}
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thread_switch (current_pid);
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prune_threads ();
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}
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/* Switch from one thread to another. */
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static void
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thread_switch (pid)
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int pid;
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{
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if (pid == inferior_pid)
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return;
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inferior_pid = pid;
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pc_changed = 0;
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flush_cached_frames ();
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registers_changed ();
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stop_pc = read_pc();
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set_current_frame (create_new_frame (read_fp (), stop_pc));
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stop_frame_address = FRAME_FP (get_current_frame ());
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select_frame (get_current_frame (), 0);
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}
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static void
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thread_command (tidstr, from_tty)
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char *tidstr;
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int from_tty;
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{
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int num;
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struct thread_info *tp;
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if (!tidstr)
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error ("Please specify a thread ID. Use the \"info threads\" command to\n\
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see the IDs of currently known threads.");
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num = atoi (tidstr);
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tp = find_thread_id (num);
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if (!tp)
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error ("Thread ID %d not known. Use the \"info threads\" command to\n\
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see the IDs of currently known threads.", num);
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thread_switch (tp->pid);
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printf_filtered ("[Switching to %s]\n", target_pid_to_str (inferior_pid));
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print_stack_frame (selected_frame, selected_frame_level, 1);
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}
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void
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_initialize_thread ()
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{
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add_info ("threads", info_threads_command,
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"IDs of currently known threads.");
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add_com ("thread", class_info, thread_command,
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"Use this command to switch between threads.\n\
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The new thread ID must be currently known.");
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}
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