From dc146f7c09d1369f5621e4aac23d410d40d3a6f0 Mon Sep 17 00:00:00 2001
From: Vladimir Prus <vladimir@codesourcery.com>
Date: Tue, 12 Jan 2010 21:40:25 +0000
Subject: 	Implement core awareness.

	* bcache.c (compare_ints): Remove
	(print_percentage): Use compare_positive_ints.
	* defs.h (compare_positive_ints): Declare.
	* linux-nat.h (struct lin_lwp): New field core.
	(linux_nat_core_of_thread_1): Declare.
	* linux-nat.c (add_lwp): Init the 'core' field.
	(linux_nat_wait_1): Record the core.
	(linux_nat_core_of_thread_1, linux_nat_core_of_thread): New.
	(linux_nat_add_target): Register the above.
	* linux-thread-db.c (update_thread_core): New.
	(thread_db_find_new_threads): Update core information for
	every thread.
	* remote.c (struct private_thread_info): New.
	(free_private_thread_info, demand_private_info): New.
	(PACKET_qXfer_threads, use_osdata_threads): New.
	(struct thread_item, threads_parsing_context
	(start_thread, end_thread, thread_attributes)
	(thread_children, threads_children, threads_elements): New.
	(remote_threads_info): Try qXfer:threads before anything
	else.
	(remote_protocol_packets): Register qXfer:threads.
	(remote_open_1): Init use_osdata_threads.
	(struct stop_reply): New field 'core'.
	(remote_parse_stop_reply): Parse core number.
	(process_stop_reply): Record core number.
	(remote_xfer_partial): Handle qXfer:threads.
	(remote_core_of_thread): New.
	(init_remote_ops): Register remote_core_of_thread.
	(_initialize_remote): Register qXfer:read.
	* target.c (target_core_of_thread): New
	* target.h (enum target_object): New value TARGET_OBJECT_THREADS.
	(struct target_ops): New field to_core_of_threads.
	(target_core_of_thread): Declare.
	* gdbthread.h (struct thread_info): New field private_dtor.
	* thread.c (print_thread_info): Report the core.
	* ui-out.c (MAX_UI_OUT_LEVELS): Increase.
	* utils.c (compare_positive_ints): New.
	* features/threads.dtd: New.
	* mi/mi-interp.c (mi_on_normal_stop): Report the core.
	* mi/mi-main.c (struct collect_cores_data, collect_cores)
	(do_nothing, free_vector_of_osdata_items)
	(splay_tree_int_comparator, free_splay_tree): New.
	(print_one_inferior_data): Implemented printing of selected
	inferiors.  Collect and print cores.
	(output_cores): New.
	(mi_cmd_list_thread_groups): Support --recurse.  Permit specifying
	thread groups together with --available.
---
 gdb/linux-nat.c | 73 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 73 insertions(+)

(limited to 'gdb/linux-nat.c')

diff --git a/gdb/linux-nat.c b/gdb/linux-nat.c
index 48ea1bc..bf0a5f1 100644
--- a/gdb/linux-nat.c
+++ b/gdb/linux-nat.c
@@ -1184,6 +1184,7 @@ add_lwp (ptid_t ptid)
   lp->waitstatus.kind = TARGET_WAITKIND_IGNORE;
 
   lp->ptid = ptid;
+  lp->core = -1;
 
   lp->next = lwp_list;
   lwp_list = lp;
@@ -3642,6 +3643,7 @@ retry:
     fprintf_unfiltered (gdb_stdlog, "LLW: exit\n");
 
   restore_child_signals_mask (&prev_mask);
+  lp->core = linux_nat_core_of_thread_1 (lp->ptid);
   return lp->ptid;
 }
 
@@ -5423,6 +5425,75 @@ linux_nat_thread_address_space (struct target_ops *t, ptid_t ptid)
   return inf->aspace;
 }
 
+int
+linux_nat_core_of_thread_1 (ptid_t ptid)
+{
+  struct cleanup *back_to;
+  char *filename;
+  FILE *f;
+  char *content = NULL;
+  char *p;
+  char *ts = 0;
+  int content_read = 0;
+  int i;
+  int core;
+
+  filename = xstrprintf ("/proc/%d/task/%ld/stat",
+			 GET_PID (ptid), GET_LWP (ptid));
+  back_to = make_cleanup (xfree, filename);
+
+  f = fopen (filename, "r");
+  if (!f)
+    {
+      do_cleanups (back_to);
+      return -1;
+    }
+
+  make_cleanup_fclose (f);
+
+  for (;;)
+    {
+      int n;
+      content = xrealloc (content, content_read + 1024);
+      n = fread (content + content_read, 1, 1024, f);
+      content_read += n;
+      if (n < 1024)
+	{
+	  content[content_read] = '\0';
+	  break;
+	}
+    }
+
+  make_cleanup (xfree, content);
+
+  p = strchr (content, '(');
+  p = strchr (p, ')') + 2; /* skip ")" and a whitespace. */
+
+  /* If the first field after program name has index 0, then core number is
+     the field with index 36.  There's no constant for that anywhere.  */
+  p = strtok_r (p, " ", &ts);
+  for (i = 0; i != 36; ++i)
+    p = strtok_r (NULL, " ", &ts);
+
+  if (sscanf (p, "%d", &core) == 0)
+    core = -1;
+
+  do_cleanups (back_to);
+
+  return core;
+}
+
+/* Return the cached value of the processor core for thread PTID.  */
+
+int
+linux_nat_core_of_thread (struct target_ops *ops, ptid_t ptid)
+{
+  struct lwp_info *info = find_lwp_pid (ptid);
+  if (info)
+    return info->core;
+  return -1;
+}
+
 void
 linux_nat_add_target (struct target_ops *t)
 {
@@ -5463,6 +5534,8 @@ linux_nat_add_target (struct target_ops *t)
 
   t->to_supports_multi_process = linux_nat_supports_multi_process;
 
+  t->to_core_of_thread = linux_nat_core_of_thread;
+
   /* We don't change the stratum; this target will sit at
      process_stratum and thread_db will set at thread_stratum.  This
      is a little strange, since this is a multi-threaded-capable
-- 
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