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e8032dde10
When GDB wants to sync the thread list with the target's (e.g., due to "info threads"), it calls update_thread_list: update_thread_list (void) { prune_threads (); target_find_new_threads (); update_threads_executing (); } And then prune_threads does: prune_threads (void) { struct thread_info *tp, *next; for (tp = thread_list; tp; tp = next) { next = tp->next; if (!thread_alive (tp)) delete_thread (tp->ptid); } } Calling thread_live on each thread one by one is expensive. E.g., on Linux, it ends up doing kill(SIG0) once for each thread. Not a big deal, but still a bunch of syscalls... With the remote target, it's cumbersome. That thread_alive call ends up generating one T packet per thread: Sending packet: $Tp2141.2150#82...Packet received: OK Sending packet: $Tp2141.214f#b7...Packet received: OK Sending packet: $Tp2141.2141#82...Packet received: OK Sending packet: $qXfer:threads:read::0,fff#03...Packet received: l<threads>\n<thread id="p2141.2141" core="2"/>\n<thread id="p2141.214f" core="1"/>\n<thread id="p2141.2150" core="2"/>\n</threads>\n That seems a bit silly when target_find_new_threads method implementations will always fetch the whole current set of target threads, and then add those that are not in GDB's thread list, to GDB's thread list. This patch thus pushes down the responsibility of pruning dead threads to the target_find_new_threads method instead, so a target may implement pruning dead threads however it wants. Once we do that, target_find_new_threads becomes a misnomer, so the patch renames it to target_update_thread_list. The patch doesn't attempt to do any optimization to any target yet. It simply exports prune_threads, and makes all implementations of target_update_thread_list call that. It's meant to be a no-op. gdb/ 2014-10-15 Pedro Alves <palves@redhat.com> * ada-tasks.c (print_ada_task_info, task_command_1): Adjust. * bsd-uthread.c (bsd_uthread_find_new_threads): Rename to ... (bsd_uthread_update_thread_list): ... this. Call prune_threads. (bsd_uthread_target): Adjust. * corelow.c (core_open): Adjust. * dec-thread.c (dec_thread_find_new_threads): Update comment. (dec_thread_update_thread_list): New function. (init_dec_thread_ops): Adjust. * gdbthread.h (prune_threads): New declaration. * linux-thread-db.c (thread_db_find_new_threads): Rename to ... (thread_db_update_thread_list): ... this. Call prune_threads. (init_thread_db_ops): Adjust. * nto-procfs.c (procfs_find_new_threads): Rename to ... (procfs_update_thread_list): ... this. Call prune_threads. (procfs_attach, procfs_create_inferior, init_procfs_targets): Adjust. * obsd-nat.c (obsd_find_new_threads): Rename to ... (obsd_update_thread_list): ... this. Call prune_threads. (obsd_add_target): Adjust. * procfs.c (procfs_target): Adjust. (procfs_notice_thread): Update comment. (procfs_find_new_threads): Rename to ... (procfs_update_thread_list): ... this. Call prune_threads. * ravenscar-thread.c (ravenscar_update_inferior_ptid): Update comment. (ravenscar_wait): Adjust. (ravenscar_find_new_threads): Rename to ... (ravenscar_update_thread_list): ... this. Call prune_threads. (init_ravenscar_thread_ops): Adjust. * record-btrace.c (record_btrace_find_new_threads): Rename to ... (record_btrace_update_thread_list): ... this. Adjust comment. (init_record_btrace_ops): Adjust. * remote.c (remote_threads_info): Rename to ... (remote_update_thread_list): ... this. Call prune_threads. (remote_start_remote, extended_remote_attach_1, init_remote_ops): Adjust. * sol-thread.c (check_for_thread_db): Adjust. (sol_find_new_threads_callback): Rename to ... (sol_update_thread_list_callback): ... this. (sol_find_new_threads): Rename to ... (sol_update_thread_list): ... this. Call prune_threads. Adjust. (sol_get_ada_task_ptid, init_sol_thread_ops): Adjust. * target-delegates.c: Regenerate. * target.c (target_find_new_threads): Rename to ... (target_update_thread_list): ... this. * target.h (struct target_ops): Rename to_find_new_threads field to to_update_thread_list. (target_find_new_threads): Rename to ... (target_update_thread_list): ... this. * thread.c (prune_threads): Make extern. (update_thread_list): Adjust.
545 lines
15 KiB
C
545 lines
15 KiB
C
/* BSD user-level threads support.
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Copyright (C) 2005-2014 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 3 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, see <http://www.gnu.org/licenses/>. */
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#include "defs.h"
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#include "gdbcore.h"
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#include "gdbthread.h"
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#include "inferior.h"
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#include "objfiles.h"
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#include "observer.h"
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#include "regcache.h"
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#include "solib.h"
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#include "solist.h"
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#include "symfile.h"
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#include "target.h"
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#include "gdb_obstack.h"
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#include "bsd-uthread.h"
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/* HACK: Save the bsd_uthreads ops returned by bsd_uthread_target. */
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static struct target_ops *bsd_uthread_ops_hack;
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/* Architecture-specific operations. */
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/* Per-architecture data key. */
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static struct gdbarch_data *bsd_uthread_data;
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struct bsd_uthread_ops
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{
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/* Supply registers for an inactive thread to a register cache. */
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void (*supply_uthread)(struct regcache *, int, CORE_ADDR);
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/* Collect registers for an inactive thread from a register cache. */
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void (*collect_uthread)(const struct regcache *, int, CORE_ADDR);
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};
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static void *
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bsd_uthread_init (struct obstack *obstack)
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{
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struct bsd_uthread_ops *ops;
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ops = OBSTACK_ZALLOC (obstack, struct bsd_uthread_ops);
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return ops;
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}
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/* Set the function that supplies registers from an inactive thread
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for architecture GDBARCH to SUPPLY_UTHREAD. */
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void
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bsd_uthread_set_supply_uthread (struct gdbarch *gdbarch,
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void (*supply_uthread) (struct regcache *,
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int, CORE_ADDR))
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{
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struct bsd_uthread_ops *ops = gdbarch_data (gdbarch, bsd_uthread_data);
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ops->supply_uthread = supply_uthread;
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}
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/* Set the function that collects registers for an inactive thread for
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architecture GDBARCH to SUPPLY_UTHREAD. */
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void
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bsd_uthread_set_collect_uthread (struct gdbarch *gdbarch,
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void (*collect_uthread) (const struct regcache *,
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int, CORE_ADDR))
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{
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struct bsd_uthread_ops *ops = gdbarch_data (gdbarch, bsd_uthread_data);
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ops->collect_uthread = collect_uthread;
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}
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/* Magic number to help recognize a valid thread structure. */
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#define BSD_UTHREAD_PTHREAD_MAGIC 0xd09ba115
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/* Check whether the thread structure at ADDR is valid. */
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static void
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bsd_uthread_check_magic (CORE_ADDR addr)
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{
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enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ());
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ULONGEST magic = read_memory_unsigned_integer (addr, 4, byte_order);
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if (magic != BSD_UTHREAD_PTHREAD_MAGIC)
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error (_("Bad magic"));
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}
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/* Thread states. */
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#define BSD_UTHREAD_PS_RUNNING 0
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#define BSD_UTHREAD_PS_DEAD 18
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/* Address of the pointer to the thread structure for the running
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thread. */
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static CORE_ADDR bsd_uthread_thread_run_addr;
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/* Address of the list of all threads. */
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static CORE_ADDR bsd_uthread_thread_list_addr;
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/* Offsets of various "interesting" bits in the thread structure. */
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static int bsd_uthread_thread_state_offset = -1;
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static int bsd_uthread_thread_next_offset = -1;
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static int bsd_uthread_thread_ctx_offset;
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/* Name of shared threads library. */
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static const char *bsd_uthread_solib_name;
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/* Non-zero if the thread startum implemented by this module is active. */
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static int bsd_uthread_active;
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static CORE_ADDR
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bsd_uthread_lookup_address (const char *name, struct objfile *objfile)
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{
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struct bound_minimal_symbol sym;
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sym = lookup_minimal_symbol (name, NULL, objfile);
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if (sym.minsym)
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return BMSYMBOL_VALUE_ADDRESS (sym);
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return 0;
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}
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static int
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bsd_uthread_lookup_offset (const char *name, struct objfile *objfile)
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{
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enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ());
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CORE_ADDR addr;
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addr = bsd_uthread_lookup_address (name, objfile);
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if (addr == 0)
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return 0;
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return read_memory_unsigned_integer (addr, 4, byte_order);
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}
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static CORE_ADDR
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bsd_uthread_read_memory_address (CORE_ADDR addr)
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{
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struct type *ptr_type = builtin_type (target_gdbarch ())->builtin_data_ptr;
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return read_memory_typed_address (addr, ptr_type);
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}
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/* If OBJFILE contains the symbols corresponding to one of the
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supported user-level threads libraries, activate the thread stratum
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implemented by this module. */
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static int
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bsd_uthread_activate (struct objfile *objfile)
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{
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struct gdbarch *gdbarch = target_gdbarch ();
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struct bsd_uthread_ops *ops = gdbarch_data (gdbarch, bsd_uthread_data);
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/* Skip if the thread stratum has already been activated. */
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if (bsd_uthread_active)
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return 0;
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/* There's no point in enabling this module if no
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architecture-specific operations are provided. */
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if (!ops->supply_uthread)
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return 0;
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bsd_uthread_thread_run_addr =
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bsd_uthread_lookup_address ("_thread_run", objfile);
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if (bsd_uthread_thread_run_addr == 0)
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return 0;
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bsd_uthread_thread_list_addr =
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bsd_uthread_lookup_address ("_thread_list", objfile);
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if (bsd_uthread_thread_list_addr == 0)
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return 0;
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bsd_uthread_thread_state_offset =
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bsd_uthread_lookup_offset ("_thread_state_offset", objfile);
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if (bsd_uthread_thread_state_offset == 0)
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return 0;
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bsd_uthread_thread_next_offset =
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bsd_uthread_lookup_offset ("_thread_next_offset", objfile);
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if (bsd_uthread_thread_next_offset == 0)
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return 0;
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bsd_uthread_thread_ctx_offset =
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bsd_uthread_lookup_offset ("_thread_ctx_offset", objfile);
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push_target (bsd_uthread_ops_hack);
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bsd_uthread_active = 1;
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return 1;
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}
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/* Cleanup due to deactivation. */
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static void
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bsd_uthread_close (struct target_ops *self)
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{
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bsd_uthread_active = 0;
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bsd_uthread_thread_run_addr = 0;
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bsd_uthread_thread_list_addr = 0;
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bsd_uthread_thread_state_offset = 0;
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bsd_uthread_thread_next_offset = 0;
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bsd_uthread_thread_ctx_offset = 0;
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bsd_uthread_solib_name = NULL;
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}
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/* Deactivate the thread stratum implemented by this module. */
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static void
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bsd_uthread_deactivate (void)
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{
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/* Skip if the thread stratum has already been deactivated. */
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if (!bsd_uthread_active)
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return;
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unpush_target (bsd_uthread_ops_hack);
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}
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static void
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bsd_uthread_inferior_created (struct target_ops *ops, int from_tty)
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{
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bsd_uthread_activate (NULL);
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}
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/* Likely candidates for the threads library. */
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static const char *bsd_uthread_solib_names[] =
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{
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"/usr/lib/libc_r.so", /* FreeBSD */
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"/usr/lib/libpthread.so", /* OpenBSD */
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NULL
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};
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static void
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bsd_uthread_solib_loaded (struct so_list *so)
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{
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const char **names = bsd_uthread_solib_names;
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for (names = bsd_uthread_solib_names; *names; names++)
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{
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if (strncmp (so->so_original_name, *names, strlen (*names)) == 0)
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{
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solib_read_symbols (so, 0);
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if (bsd_uthread_activate (so->objfile))
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{
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bsd_uthread_solib_name = so->so_original_name;
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return;
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}
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}
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}
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}
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static void
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bsd_uthread_solib_unloaded (struct so_list *so)
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{
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if (!bsd_uthread_solib_name)
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return;
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if (strcmp (so->so_original_name, bsd_uthread_solib_name) == 0)
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bsd_uthread_deactivate ();
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}
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static void
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bsd_uthread_mourn_inferior (struct target_ops *ops)
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{
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struct target_ops *beneath = find_target_beneath (ops);
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beneath->to_mourn_inferior (beneath);
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bsd_uthread_deactivate ();
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}
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static void
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bsd_uthread_fetch_registers (struct target_ops *ops,
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struct regcache *regcache, int regnum)
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{
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struct gdbarch *gdbarch = get_regcache_arch (regcache);
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struct bsd_uthread_ops *uthread_ops = gdbarch_data (gdbarch, bsd_uthread_data);
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CORE_ADDR addr = ptid_get_tid (inferior_ptid);
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struct target_ops *beneath = find_target_beneath (ops);
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CORE_ADDR active_addr;
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/* Always fetch the appropriate registers from the layer beneath. */
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beneath->to_fetch_registers (beneath, regcache, regnum);
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/* FIXME: That might have gotten us more than we asked for. Make
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sure we overwrite all relevant registers with values from the
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thread structure. This can go once we fix the underlying target. */
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regnum = -1;
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active_addr = bsd_uthread_read_memory_address (bsd_uthread_thread_run_addr);
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if (addr != 0 && addr != active_addr)
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{
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bsd_uthread_check_magic (addr);
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uthread_ops->supply_uthread (regcache, regnum,
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addr + bsd_uthread_thread_ctx_offset);
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}
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}
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static void
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bsd_uthread_store_registers (struct target_ops *ops,
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struct regcache *regcache, int regnum)
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{
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struct gdbarch *gdbarch = get_regcache_arch (regcache);
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struct bsd_uthread_ops *uthread_ops = gdbarch_data (gdbarch, bsd_uthread_data);
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struct target_ops *beneath = find_target_beneath (ops);
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CORE_ADDR addr = ptid_get_tid (inferior_ptid);
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CORE_ADDR active_addr;
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active_addr = bsd_uthread_read_memory_address (bsd_uthread_thread_run_addr);
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if (addr != 0 && addr != active_addr)
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{
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bsd_uthread_check_magic (addr);
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uthread_ops->collect_uthread (regcache, regnum,
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addr + bsd_uthread_thread_ctx_offset);
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}
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else
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{
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/* Updating the thread that is currently running; pass the
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request to the layer beneath. */
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beneath->to_store_registers (beneath, regcache, regnum);
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}
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}
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static ptid_t
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bsd_uthread_wait (struct target_ops *ops,
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ptid_t ptid, struct target_waitstatus *status, int options)
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{
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enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ());
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CORE_ADDR addr;
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struct target_ops *beneath = find_target_beneath (ops);
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/* Pass the request to the layer beneath. */
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ptid = beneath->to_wait (beneath, ptid, status, options);
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/* If the process is no longer alive, there's no point in figuring
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out the thread ID. It will fail anyway. */
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if (status->kind == TARGET_WAITKIND_SIGNALLED
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|| status->kind == TARGET_WAITKIND_EXITED)
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return ptid;
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/* Fetch the corresponding thread ID, and augment the returned
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process ID with it. */
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addr = bsd_uthread_read_memory_address (bsd_uthread_thread_run_addr);
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if (addr != 0)
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{
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gdb_byte buf[4];
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/* FIXME: For executables linked statically with the threads
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library, we end up here before the program has actually been
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executed. In that case ADDR will be garbage since it has
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been read from the wrong virtual memory image. */
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if (target_read_memory (addr, buf, 4) == 0)
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{
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ULONGEST magic = extract_unsigned_integer (buf, 4, byte_order);
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if (magic == BSD_UTHREAD_PTHREAD_MAGIC)
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ptid = ptid_build (ptid_get_pid (ptid), 0, addr);
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}
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}
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/* If INFERIOR_PTID doesn't have a tid member yet, and we now have a
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ptid with tid set, then ptid is still the initial thread of
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the process. Notify GDB core about it. */
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if (ptid_get_tid (inferior_ptid) == 0
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&& ptid_get_tid (ptid) != 0 && !in_thread_list (ptid))
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thread_change_ptid (inferior_ptid, ptid);
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/* Don't let the core see a ptid without a corresponding thread. */
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if (!in_thread_list (ptid) || is_exited (ptid))
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add_thread (ptid);
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return ptid;
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}
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static void
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bsd_uthread_resume (struct target_ops *ops,
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ptid_t ptid, int step, enum gdb_signal sig)
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{
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/* Pass the request to the layer beneath. */
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struct target_ops *beneath = find_target_beneath (ops);
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beneath->to_resume (beneath, ptid, step, sig);
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}
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static int
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bsd_uthread_thread_alive (struct target_ops *ops, ptid_t ptid)
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{
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enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ());
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struct target_ops *beneath = find_target_beneath (ops);
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CORE_ADDR addr = ptid_get_tid (inferior_ptid);
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if (addr != 0)
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{
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int offset = bsd_uthread_thread_state_offset;
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ULONGEST state;
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bsd_uthread_check_magic (addr);
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state = read_memory_unsigned_integer (addr + offset, 4, byte_order);
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if (state == BSD_UTHREAD_PS_DEAD)
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return 0;
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}
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return beneath->to_thread_alive (beneath, ptid);
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}
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static void
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bsd_uthread_update_thread_list (struct target_ops *ops)
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{
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pid_t pid = ptid_get_pid (inferior_ptid);
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int offset = bsd_uthread_thread_next_offset;
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CORE_ADDR addr;
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prune_threads ();
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addr = bsd_uthread_read_memory_address (bsd_uthread_thread_list_addr);
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while (addr != 0)
|
||
{
|
||
ptid_t ptid = ptid_build (pid, 0, addr);
|
||
|
||
if (!in_thread_list (ptid) || is_exited (ptid))
|
||
{
|
||
/* If INFERIOR_PTID doesn't have a tid member yet, then ptid
|
||
is still the initial thread of the process. Notify GDB
|
||
core about it. */
|
||
if (ptid_get_tid (inferior_ptid) == 0)
|
||
thread_change_ptid (inferior_ptid, ptid);
|
||
else
|
||
add_thread (ptid);
|
||
}
|
||
|
||
addr = bsd_uthread_read_memory_address (addr + offset);
|
||
}
|
||
}
|
||
|
||
/* Possible states a thread can be in. */
|
||
static char *bsd_uthread_state[] =
|
||
{
|
||
"RUNNING",
|
||
"SIGTHREAD",
|
||
"MUTEX_WAIT",
|
||
"COND_WAIT",
|
||
"FDLR_WAIT",
|
||
"FDLW_WAIT",
|
||
"FDR_WAIT",
|
||
"FDW_WAIT",
|
||
"FILE_WAIT",
|
||
"POLL_WAIT",
|
||
"SELECT_WAIT",
|
||
"SLEEP_WAIT",
|
||
"WAIT_WAIT",
|
||
"SIGSUSPEND",
|
||
"SIGWAIT",
|
||
"SPINBLOCK",
|
||
"JOIN",
|
||
"SUSPENDED",
|
||
"DEAD",
|
||
"DEADLOCK"
|
||
};
|
||
|
||
/* Return a string describing th state of the thread specified by
|
||
INFO. */
|
||
|
||
static char *
|
||
bsd_uthread_extra_thread_info (struct target_ops *self,
|
||
struct thread_info *info)
|
||
{
|
||
enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ());
|
||
CORE_ADDR addr = ptid_get_tid (info->ptid);
|
||
|
||
if (addr != 0)
|
||
{
|
||
int offset = bsd_uthread_thread_state_offset;
|
||
ULONGEST state;
|
||
|
||
state = read_memory_unsigned_integer (addr + offset, 4, byte_order);
|
||
if (state < ARRAY_SIZE (bsd_uthread_state))
|
||
return bsd_uthread_state[state];
|
||
}
|
||
|
||
return NULL;
|
||
}
|
||
|
||
static char *
|
||
bsd_uthread_pid_to_str (struct target_ops *ops, ptid_t ptid)
|
||
{
|
||
if (ptid_get_tid (ptid) != 0)
|
||
{
|
||
static char buf[64];
|
||
|
||
xsnprintf (buf, sizeof buf, "process %d, thread 0x%lx",
|
||
ptid_get_pid (ptid), ptid_get_tid (ptid));
|
||
return buf;
|
||
}
|
||
|
||
return normal_pid_to_str (ptid);
|
||
}
|
||
|
||
static struct target_ops *
|
||
bsd_uthread_target (void)
|
||
{
|
||
struct target_ops *t = XCNEW (struct target_ops);
|
||
|
||
t->to_shortname = "bsd-uthreads";
|
||
t->to_longname = "BSD user-level threads";
|
||
t->to_doc = "BSD user-level threads";
|
||
t->to_close = bsd_uthread_close;
|
||
t->to_mourn_inferior = bsd_uthread_mourn_inferior;
|
||
t->to_fetch_registers = bsd_uthread_fetch_registers;
|
||
t->to_store_registers = bsd_uthread_store_registers;
|
||
t->to_wait = bsd_uthread_wait;
|
||
t->to_resume = bsd_uthread_resume;
|
||
t->to_thread_alive = bsd_uthread_thread_alive;
|
||
t->to_update_thread_list = bsd_uthread_update_thread_list;
|
||
t->to_extra_thread_info = bsd_uthread_extra_thread_info;
|
||
t->to_pid_to_str = bsd_uthread_pid_to_str;
|
||
t->to_stratum = thread_stratum;
|
||
t->to_magic = OPS_MAGIC;
|
||
bsd_uthread_ops_hack = t;
|
||
|
||
return t;
|
||
}
|
||
|
||
/* Provide a prototype to silence -Wmissing-prototypes. */
|
||
extern initialize_file_ftype _initialize_bsd_uthread;
|
||
|
||
void
|
||
_initialize_bsd_uthread (void)
|
||
{
|
||
complete_target_initialization (bsd_uthread_target ());
|
||
|
||
bsd_uthread_data = gdbarch_data_register_pre_init (bsd_uthread_init);
|
||
|
||
observer_attach_inferior_created (bsd_uthread_inferior_created);
|
||
observer_attach_solib_loaded (bsd_uthread_solib_loaded);
|
||
observer_attach_solib_unloaded (bsd_uthread_solib_unloaded);
|
||
}
|