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authorStan Shebs <shebs@codesourcery.com>1999-04-16 01:35:26 +0000
committerStan Shebs <shebs@codesourcery.com>1999-04-16 01:35:26 +0000
commitc906108c21474dfb4ed285bcc0ac6fe02cd400cc (patch)
treea0015aa5cedc19ccbab307251353a41722a3ae13 /gdb/thread.c
parentcd946cff9ede3f30935803403f06f6ed30cad136 (diff)
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Initial creation of sourceware repositorygdb-4_18-branchpoint
Diffstat (limited to 'gdb/thread.c')
-rw-r--r--gdb/thread.c721
1 files changed, 721 insertions, 0 deletions
diff --git a/gdb/thread.c b/gdb/thread.c
new file mode 100644
index 0000000..6a7ab09
--- /dev/null
+++ b/gdb/thread.c
@@ -0,0 +1,721 @@
+/* Multi-process/thread control for GDB, the GNU debugger.
+ Copyright 1986, 1987, 1988, 1993, 1998
+
+ Contributed by Lynx Real-Time Systems, Inc. Los Gatos, CA.
+ Free Software Foundation, Inc.
+
+This file is part of GDB.
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2 of the License, or
+(at your option) any later version.
+
+This program 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 General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
+
+#include "defs.h"
+#include "symtab.h"
+#include "frame.h"
+#include "inferior.h"
+#include "environ.h"
+#include "value.h"
+#include "target.h"
+#include "gdbthread.h"
+#include "command.h"
+#include "gdbcmd.h"
+
+#include <ctype.h>
+#include <sys/types.h>
+#include <signal.h>
+
+/*#include "lynxos-core.h"*/
+
+struct thread_info
+{
+ struct thread_info *next;
+ int pid; /* Actual process id */
+ int num; /* Convenient handle */
+ CORE_ADDR prev_pc; /* State from wait_for_inferior */
+ CORE_ADDR prev_func_start;
+ char *prev_func_name;
+ struct breakpoint *step_resume_breakpoint;
+ struct breakpoint *through_sigtramp_breakpoint;
+ CORE_ADDR step_range_start;
+ CORE_ADDR step_range_end;
+ CORE_ADDR step_frame_address;
+ int trap_expected;
+ int handling_longjmp;
+ int another_trap;
+
+ /* This is set TRUE when a catchpoint of a shared library event
+ triggers. Since we don't wish to leave the inferior in the
+ solib hook when we report the event, we step the inferior
+ back to user code before stopping and reporting the event.
+ */
+ int stepping_through_solib_after_catch;
+
+ /* When stepping_through_solib_after_catch is TRUE, this is a
+ list of the catchpoints that should be reported as triggering
+ when we finally do stop stepping.
+ */
+ bpstat stepping_through_solib_catchpoints;
+
+ /* This is set to TRUE when this thread is in a signal handler
+ trampoline and we're single-stepping through it */
+ int stepping_through_sigtramp;
+
+};
+
+/* Prototypes for exported functions. */
+
+void _initialize_thread PARAMS ((void));
+
+/* Prototypes for local functions. */
+
+#if !defined(FIND_NEW_THREADS)
+#define FIND_NEW_THREADS target_find_new_threads
+#endif
+
+static struct thread_info *thread_list = NULL;
+static int highest_thread_num;
+
+static struct thread_info * find_thread_id PARAMS ((int num));
+
+static void thread_command PARAMS ((char * tidstr, int from_tty));
+static void thread_apply_all_command PARAMS ((char *, int));
+static int thread_alive PARAMS ((struct thread_info *));
+static void info_threads_command PARAMS ((char *, int));
+static void thread_apply_command PARAMS ((char *, int));
+static void restore_current_thread PARAMS ((int));
+static void switch_to_thread PARAMS ((int pid));
+static void prune_threads PARAMS ((void));
+
+/* If the host has threads, the host machine definition may set this
+ macro. But, for remote thread debugging, it gets more complex and
+ setting macros does not bind to the various target dependent
+ methods well. So, we use the vector target_thread_functions */
+
+static struct target_thread_vector *target_thread_functions;
+
+int
+target_find_new_threads ()
+{
+ int retval = 0;
+ if (target_thread_functions &&
+ target_thread_functions->find_new_threads)
+ retval = (*(target_thread_functions->find_new_threads)) ();
+ return retval; /* no support */
+}
+
+
+int
+target_get_thread_info PARAMS ((gdb_threadref * ref,
+ int selection, /* FIXME: Selection */
+ struct gdb_ext_thread_info * info));
+
+int
+target_get_thread_info (ref, selection, info)
+
+ gdb_threadref *ref;
+ int selection;
+ /* FIXME: Selection */
+ struct gdb_ext_thread_info *info;
+
+{
+ int retval = 0;
+ if (target_thread_functions
+ && target_thread_functions->get_thread_info)
+ retval = (*(target_thread_functions->get_thread_info)) (ref, selection, info);
+ return retval;
+}
+
+
+/* It is possible that these bind and unbinf functions implement a
+ stack the interface allows it, but its not implemented that way
+ */
+
+
+void
+bind_target_thread_vector (vec)
+ struct target_thread_vector *vec;
+{
+ target_thread_functions = vec;
+}
+
+struct target_thread_vector *
+unbind_target_thread_vector ()
+{
+ struct target_thread_vector *retval;
+ retval = target_thread_functions;
+ target_thread_functions = 0;
+ return retval;
+} /* unbind_target_thread-vector */
+
+void
+init_thread_list ()
+{
+ struct thread_info *tp, *tpnext;
+
+ if (!thread_list)
+ return;
+
+ for (tp = thread_list; tp; tp = tpnext)
+ {
+ tpnext = tp->next;
+ free (tp);
+ }
+
+ thread_list = NULL;
+ highest_thread_num = 0;
+}
+
+void
+add_thread (pid)
+ int pid;
+{
+ struct thread_info *tp;
+
+ tp = (struct thread_info *) xmalloc (sizeof (struct thread_info));
+
+ tp->pid = pid;
+ tp->num = ++highest_thread_num;
+ tp->prev_pc = 0;
+ tp->prev_func_start = 0;
+ tp->prev_func_name = NULL;
+ tp->step_range_start = 0;
+ tp->step_range_end = 0;
+ tp->step_frame_address =0;
+ tp->step_resume_breakpoint = 0;
+ tp->through_sigtramp_breakpoint = 0;
+ tp->handling_longjmp = 0;
+ tp->trap_expected = 0;
+ tp->another_trap = 0;
+ tp->stepping_through_solib_after_catch = 0;
+ tp->stepping_through_solib_catchpoints = NULL;
+ tp->stepping_through_sigtramp = 0;
+ tp->next = thread_list;
+ thread_list = tp;
+}
+
+void
+delete_thread (pid)
+ int pid;
+{
+ struct thread_info *tp, *tpprev;
+
+ tpprev = NULL;
+
+ for (tp = thread_list; tp; tpprev = tp, tp = tp->next)
+ if (tp->pid == pid)
+ break;
+
+ if (!tp)
+ return;
+
+ if (tpprev)
+ tpprev->next = tp->next;
+ else
+ thread_list = tp->next;
+
+ free (tp);
+
+ return;
+}
+
+static struct thread_info *
+find_thread_id (num)
+ int num;
+{
+ struct thread_info *tp;
+
+ for (tp = thread_list; tp; tp = tp->next)
+ if (tp->num == num)
+ return tp;
+
+ return NULL;
+}
+
+int
+valid_thread_id (num)
+ int num;
+{
+ struct thread_info *tp;
+
+ for (tp = thread_list; tp; tp = tp->next)
+ if (tp->num == num)
+ return 1;
+
+ return 0;
+}
+
+int
+pid_to_thread_id (pid)
+ int pid;
+{
+ struct thread_info *tp;
+
+ for (tp = thread_list; tp; tp = tp->next)
+ if (tp->pid == pid)
+ return tp->num;
+
+ return 0;
+}
+
+int
+thread_id_to_pid (num)
+ int num;
+{
+ struct thread_info *thread = find_thread_id (num);
+ if (thread)
+ return thread->pid;
+ else
+ return -1;
+}
+
+int
+in_thread_list (pid)
+ int pid;
+{
+ struct thread_info *tp;
+
+ for (tp = thread_list; tp; tp = tp->next)
+ if (tp->pid == pid)
+ return 1;
+
+ return 0; /* Never heard of 'im */
+}
+
+/* Load infrun state for the thread PID. */
+
+void load_infrun_state (pid, prev_pc, prev_func_start, prev_func_name,
+ trap_expected, step_resume_breakpoint,
+ through_sigtramp_breakpoint, step_range_start,
+ step_range_end, step_frame_address,
+ handling_longjmp, another_trap,
+ stepping_through_solib_after_catch,
+ stepping_through_solib_catchpoints,
+ stepping_through_sigtramp)
+ int pid;
+ CORE_ADDR *prev_pc;
+ CORE_ADDR *prev_func_start;
+ char **prev_func_name;
+ int *trap_expected;
+ struct breakpoint **step_resume_breakpoint;
+ struct breakpoint **through_sigtramp_breakpoint;
+ CORE_ADDR *step_range_start;
+ CORE_ADDR *step_range_end;
+ CORE_ADDR *step_frame_address;
+ int *handling_longjmp;
+ int *another_trap;
+ int * stepping_through_solib_after_catch;
+ bpstat * stepping_through_solib_catchpoints;
+ int * stepping_through_sigtramp;
+{
+ struct thread_info *tp;
+
+ /* If we can't find the thread, then we're debugging a single threaded
+ process. No need to do anything in that case. */
+ tp = find_thread_id (pid_to_thread_id (pid));
+ if (tp == NULL)
+ return;
+
+ *prev_pc = tp->prev_pc;
+ *prev_func_start = tp->prev_func_start;
+ *prev_func_name = tp->prev_func_name;
+ *step_resume_breakpoint = tp->step_resume_breakpoint;
+ *step_range_start = tp->step_range_start;
+ *step_range_end = tp->step_range_end;
+ *step_frame_address = tp->step_frame_address;
+ *through_sigtramp_breakpoint = tp->through_sigtramp_breakpoint;
+ *handling_longjmp = tp->handling_longjmp;
+ *trap_expected = tp->trap_expected;
+ *another_trap = tp->another_trap;
+ *stepping_through_solib_after_catch = tp->stepping_through_solib_after_catch;
+ *stepping_through_solib_catchpoints = tp->stepping_through_solib_catchpoints;
+ *stepping_through_sigtramp = tp->stepping_through_sigtramp;
+}
+
+/* Save infrun state for the thread PID. */
+
+void save_infrun_state (pid, prev_pc, prev_func_start, prev_func_name,
+ trap_expected, step_resume_breakpoint,
+ through_sigtramp_breakpoint, step_range_start,
+ step_range_end, step_frame_address,
+ handling_longjmp, another_trap,
+ stepping_through_solib_after_catch,
+ stepping_through_solib_catchpoints,
+ stepping_through_sigtramp)
+ int pid;
+ CORE_ADDR prev_pc;
+ CORE_ADDR prev_func_start;
+ char *prev_func_name;
+ int trap_expected;
+ struct breakpoint *step_resume_breakpoint;
+ struct breakpoint *through_sigtramp_breakpoint;
+ CORE_ADDR step_range_start;
+ CORE_ADDR step_range_end;
+ CORE_ADDR step_frame_address;
+ int handling_longjmp;
+ int another_trap;
+ int stepping_through_solib_after_catch;
+ bpstat stepping_through_solib_catchpoints;
+ int stepping_through_sigtramp;
+{
+ struct thread_info *tp;
+
+ /* If we can't find the thread, then we're debugging a single-threaded
+ process. Nothing to do in that case. */
+ tp = find_thread_id (pid_to_thread_id (pid));
+ if (tp == NULL)
+ return;
+
+ tp->prev_pc = prev_pc;
+ tp->prev_func_start = prev_func_start;
+ tp->prev_func_name = prev_func_name;
+ tp->step_resume_breakpoint = step_resume_breakpoint;
+ tp->step_range_start = step_range_start;
+ tp->step_range_end = step_range_end;
+ tp->step_frame_address = step_frame_address;
+ tp->through_sigtramp_breakpoint = through_sigtramp_breakpoint;
+ tp->handling_longjmp = handling_longjmp;
+ tp->trap_expected = trap_expected;
+ tp->another_trap = another_trap;
+ tp->stepping_through_solib_after_catch = stepping_through_solib_after_catch;
+ tp->stepping_through_solib_catchpoints = stepping_through_solib_catchpoints;
+ tp->stepping_through_sigtramp = stepping_through_sigtramp;
+}
+
+/* Return true if TP is an active thread. */
+static int
+thread_alive (tp)
+ struct thread_info *tp;
+{
+ if (tp->pid == -1)
+ return 0;
+ if (! target_thread_alive (tp->pid))
+ {
+ tp->pid = -1; /* Mark it as dead */
+ return 0;
+ }
+ return 1;
+}
+
+static void
+prune_threads ()
+{
+ struct thread_info *tp, *tpprev, *next;
+
+ tpprev = 0;
+ for (tp = thread_list; tp; tp = next)
+ {
+ next = tp->next;
+ if (!thread_alive (tp))
+ {
+ if (tpprev)
+ tpprev->next = next;
+ else
+ thread_list = next;
+ free (tp);
+ }
+ else
+ tpprev = tp;
+ }
+}
+
+/* Print information about currently known threads
+ *
+ * Note: this has the drawback that it _really_ switches
+ * threads, which frees the frame cache. A no-side
+ * effects info-threads command would be nicer.
+ */
+
+static void
+info_threads_command (arg, from_tty)
+ char *arg;
+ int from_tty;
+{
+ struct thread_info *tp;
+ int current_pid;
+ struct frame_info *cur_frame;
+ int saved_frame_level = selected_frame_level;
+ int counter;
+
+ /* Avoid coredumps which would happen if we tried to access a NULL
+ selected_frame. */
+ if (!target_has_stack) error ("No stack.");
+
+ prune_threads ();
+#if defined(FIND_NEW_THREADS)
+ FIND_NEW_THREADS ();
+#endif
+ current_pid = inferior_pid;
+ for (tp = thread_list; tp; tp = tp->next)
+ {
+ if (tp->pid == current_pid)
+ printf_filtered ("* ");
+ else
+ printf_filtered (" ");
+
+#ifdef HPUXHPPA
+ printf_filtered ("%d %s ", tp->num, target_tid_to_str (tp->pid));
+#else
+ printf_filtered ("%d %s ", tp->num, target_pid_to_str (tp->pid));
+#endif
+ switch_to_thread (tp->pid);
+ if (selected_frame)
+ print_only_stack_frame (selected_frame, -1, 0);
+ else
+ printf_filtered ("[No stack.]\n");
+ }
+
+ switch_to_thread (current_pid);
+
+ /* Code below copied from "up_silently_base" in "stack.c".
+ * It restores the frame set by the user before the "info threads"
+ * command. We have finished the info-threads display by switching
+ * back to the current thread. That switch has put us at the top
+ * of the stack (leaf frame).
+ */
+ counter = saved_frame_level;
+ cur_frame = find_relative_frame(selected_frame, &counter);
+ if (counter != 0)
+ {
+ /* Ooops, can't restore, tell user where we are. */
+ warning ("Couldn't restore frame in current thread, at frame 0");
+ print_stack_frame (selected_frame, -1, 0);
+ }
+ else
+ {
+ select_frame(cur_frame, saved_frame_level);
+ }
+
+ /* re-show current frame. */
+ show_stack_frame(cur_frame);
+}
+
+/* Switch from one thread to another. */
+
+static void
+switch_to_thread (pid)
+ int pid;
+{
+ if (pid == inferior_pid)
+ return;
+
+ inferior_pid = pid;
+ flush_cached_frames ();
+ registers_changed ();
+ stop_pc = read_pc();
+ select_frame (get_current_frame (), 0);
+}
+
+static void
+restore_current_thread (pid)
+ int pid;
+{
+ if (pid != inferior_pid)
+ {
+ switch_to_thread (pid);
+ print_stack_frame( get_current_frame(), 0, -1);
+ }
+}
+
+/* Apply a GDB command to a list of threads. List syntax is a whitespace
+ seperated list of numbers, or ranges, or the keyword `all'. Ranges consist
+ of two numbers seperated by a hyphen. Examples:
+
+ thread apply 1 2 7 4 backtrace Apply backtrace cmd to threads 1,2,7,4
+ thread apply 2-7 9 p foo(1) Apply p foo(1) cmd to threads 2->7 & 9
+ thread apply all p x/i $pc Apply x/i $pc cmd to all threads
+*/
+
+static void
+thread_apply_all_command (cmd, from_tty)
+ char *cmd;
+ int from_tty;
+{
+ struct thread_info *tp;
+ struct cleanup *old_chain;
+
+ if (cmd == NULL || *cmd == '\000')
+ error ("Please specify a command following the thread ID list");
+
+ old_chain = make_cleanup ((make_cleanup_func) restore_current_thread,
+ (void *) inferior_pid);
+
+ for (tp = thread_list; tp; tp = tp->next)
+ if (thread_alive (tp))
+ {
+ switch_to_thread (tp->pid);
+#ifdef HPUXHPPA
+ printf_filtered ("\nThread %d (%s):\n",
+ tp->num,
+ target_tid_to_str (inferior_pid));
+#else
+ printf_filtered ("\nThread %d (%s):\n", tp->num,
+ target_pid_to_str (inferior_pid));
+#endif
+ execute_command (cmd, from_tty);
+ }
+}
+
+static void
+thread_apply_command (tidlist, from_tty)
+ char *tidlist;
+ int from_tty;
+{
+ char *cmd;
+ char *p;
+ struct cleanup *old_chain;
+
+ if (tidlist == NULL || *tidlist == '\000')
+ error ("Please specify a thread ID list");
+
+ for (cmd = tidlist; *cmd != '\000' && !isalpha(*cmd); cmd++);
+
+ if (*cmd == '\000')
+ error ("Please specify a command following the thread ID list");
+
+ old_chain = make_cleanup ((make_cleanup_func) restore_current_thread,
+ (void *) inferior_pid);
+
+ while (tidlist < cmd)
+ {
+ struct thread_info *tp;
+ int start, end;
+
+ start = strtol (tidlist, &p, 10);
+ if (p == tidlist)
+ error ("Error parsing %s", tidlist);
+ tidlist = p;
+
+ while (*tidlist == ' ' || *tidlist == '\t')
+ tidlist++;
+
+ if (*tidlist == '-') /* Got a range of IDs? */
+ {
+ tidlist++; /* Skip the - */
+ end = strtol (tidlist, &p, 10);
+ if (p == tidlist)
+ error ("Error parsing %s", tidlist);
+ tidlist = p;
+
+ while (*tidlist == ' ' || *tidlist == '\t')
+ tidlist++;
+ }
+ else
+ end = start;
+
+ for (; start <= end; start++)
+ {
+ tp = find_thread_id (start);
+
+ if (!tp)
+ warning ("Unknown thread %d.", start);
+ else if (!thread_alive (tp))
+ warning ("Thread %d has terminated.", start);
+ else
+ {
+ switch_to_thread (tp->pid);
+#ifdef HPUXHPPA
+ printf_filtered ("\nThread %d (%s):\n", tp->num,
+ target_tid_to_str (inferior_pid));
+#else
+ printf_filtered ("\nThread %d (%s):\n", tp->num,
+ target_pid_to_str (inferior_pid));
+#endif
+ execute_command (cmd, from_tty);
+ }
+ }
+ }
+}
+
+/* Switch to the specified thread. Will dispatch off to thread_apply_command
+ if prefix of arg is `apply'. */
+
+static void
+thread_command (tidstr, from_tty)
+ char *tidstr;
+ int from_tty;
+{
+ int num;
+ struct thread_info *tp;
+
+ if (!tidstr)
+ {
+ /* Don't generate an error, just say which thread is current. */
+ if (target_has_stack)
+ printf_filtered ("[Current thread is %d (%s)]\n",
+ pid_to_thread_id(inferior_pid),
+#if defined(HPUXHPPA)
+ target_tid_to_str(inferior_pid)
+#else
+ target_pid_to_str(inferior_pid)
+#endif
+ );
+ else
+ error ("No stack.");
+ return;
+ }
+ num = atoi (tidstr);
+
+ tp = find_thread_id (num);
+
+ if (!tp)
+ error ("Thread ID %d not known. Use the \"info threads\" command to\n\
+see the IDs of currently known threads.", num);
+
+ if (!thread_alive (tp))
+ error ("Thread ID %d has terminated.\n", num);
+
+ switch_to_thread (tp->pid);
+
+ if (context_hook)
+ context_hook (num);
+
+ printf_filtered ("[Switching to thread %d (%s)]\n",
+ pid_to_thread_id (inferior_pid),
+#if defined(HPUXHPPA)
+ target_tid_to_str (inferior_pid)
+#else
+ target_pid_to_str (inferior_pid)
+#endif
+ );
+ print_stack_frame (selected_frame, selected_frame_level, 1);
+}
+
+/* Commands with a prefix of `thread'. */
+struct cmd_list_element *thread_cmd_list = NULL;
+
+void
+_initialize_thread ()
+{
+ static struct cmd_list_element *thread_apply_list = NULL;
+ extern struct cmd_list_element *cmdlist;
+
+ add_info ("threads", info_threads_command,
+ "IDs of currently known threads.");
+
+ add_prefix_cmd ("thread", class_run, thread_command,
+ "Use this command to switch between threads.\n\
+The new thread ID must be currently known.", &thread_cmd_list, "thread ", 1,
+ &cmdlist);
+
+ add_prefix_cmd ("apply", class_run, thread_apply_command,
+ "Apply a command to a list of threads.",
+ &thread_apply_list, "apply ", 1, &thread_cmd_list);
+
+ add_cmd ("all", class_run, thread_apply_all_command,
+ "Apply a command to all threads.",
+ &thread_apply_list);
+
+ if (!xdb_commands)
+ add_com_alias ("t", "thread", class_run, 1);
+}