gdbserver: Remove duplicate functions to find any thread of process

We have about 6 functions/callbacks to find_inferior meant to find a
thread that belongs to a given pid.  Remove all but
find_any_thread_of_pid and replace their uses with
find_any_thread_of_pid.

gdb/gdbserver/ChangeLog:

	* server.c (first_thread_of): Remove.
	(process_serial_event): Replace usage of first_thread_of with
	find_any_thread_of_pid.
	* tracepoint.c (same_process_p): Remove.
	(gdb_agent_about_to_close): Replace usage of same_process_p with
	find_any_thread_of_pid.
	* linux-x86-low.c (same_process_callback): Remove.
	(x86_arch_setup_process_callback): Replace usage of
	same_process_callback with find_any_thread_of_pid.
	* thread-db.c (any_thread_of): Remove.
	(switch_to_process): Replace usage of any_thread_of with
	find_any_thread_of_pid.
	* inferiors.c (thread_pid_matches_callback): Remove.
	(find_thread_process): Adjust to use find_any_thread_of_pid.

gdb/gdbserver/ChangeLog

@@ -1,3 +1,20 @@
+2017-09-15  Simon Marchi  <simon.marchi@ericsson.com>
+
+	* server.c (first_thread_of): Remove.
+	(process_serial_event): Replace usage of first_thread_of with
+	find_any_thread_of_pid.
+	* tracepoint.c (same_process_p): Remove.
+	(gdb_agent_about_to_close): Replace usage of same_process_p with
+	find_any_thread_of_pid.
+	* linux-x86-low.c (same_process_callback): Remove.
+	(x86_arch_setup_process_callback): Replace usage of
+	same_process_callback with find_any_thread_of_pid.
+	* thread-db.c (any_thread_of): Remove.
+	(switch_to_process): Replace usage of any_thread_of with
+	find_any_thread_of_pid.
+	* inferiors.c (thread_pid_matches_callback): Remove.
+	(find_thread_process): Adjust to use find_any_thread_of_pid.
+
 2017-09-10  Sergio Durigan Junior  <sergiodj@redhat.com>
 
 	* regcache.c (get_thread_regcache): Guard calls to "memset"

gdb/gdbserver/inferiors.c

@@ -141,25 +141,13 @@ find_thread_ptid (ptid_t ptid)
   return (struct thread_info *) find_inferior_id (&all_threads, ptid);
 }
 
-/* Predicate function for matching thread entry's pid to the given
-   pid value passed by address in ARGS.  */
-
-static int
-thread_pid_matches_callback (struct inferior_list_entry *entry, void *args)
-{
-  return (ptid_get_pid (entry->id) == *(pid_t *)args);
-}
-
 /* Find a thread associated with the given PROCESS, or NULL if no
    such thread exists.  */
 
 static struct thread_info *
 find_thread_process (const struct process_info *const process)
 {
-  pid_t pid = ptid_get_pid (ptid_of (process));
-
-  return (struct thread_info *)
-    find_inferior (&all_threads, thread_pid_matches_callback, &pid);
+  return find_any_thread_of_pid (process->entry.id.pid ());
 }
 
 /* Helper for find_any_thread_of_pid.  Returns true if a thread

gdb/gdbserver/linux-x86-low.c

@@ -846,17 +846,6 @@ x86_linux_read_description (void)
   gdb_assert_not_reached ("failed to return tdesc");
 }
 
-/* Callback for find_inferior.  Stops iteration when a thread with a
-   given PID is found.  */
-
-static int
-same_process_callback (struct inferior_list_entry *entry, void *data)
-{
-  int pid = *(int *) data;
-
-  return (ptid_get_pid (entry->id) == pid);
-}
-
 /* Callback for for_each_inferior.  Calls the arch_setup routine for
    each process.  */
 
@@ -866,9 +855,7 @@ x86_arch_setup_process_callback (struct inferior_list_entry *entry)
   int pid = ptid_get_pid (entry->id);
 
   /* Look up any thread of this processes.  */
-  current_thread
-    = (struct thread_info *) find_inferior (&all_threads,
-					    same_process_callback, &pid);
+  current_thread = find_any_thread_of_pid (pid);
 
   the_low_target.arch_setup ();
 }

gdb/gdbserver/server.c

@@ -3450,17 +3450,6 @@ gdbserver_show_disableable (FILE *stream)
       break;					\
     }
 
-static int
-first_thread_of (struct inferior_list_entry *entry, void *args)
-{
-  int pid = * (int *) args;
-
-  if (ptid_get_pid (entry->id) == pid)
-    return 1;
-
-  return 0;
-}
-
 static void
 kill_inferior_callback (struct inferior_list_entry *entry)
 {
@@ -4162,11 +4151,9 @@ process_serial_event (void)
 		   && ptid_equal (pid_to_ptid (pid),
 				  gdb_id))
 	    {
-	      struct thread_info *thread =
-		(struct thread_info *) find_inferior (&all_threads,
-						      first_thread_of,
-						      &pid);
-	      if (!thread)
+	      thread_info *thread = find_any_thread_of_pid (pid);
+
+	      if (thread == NULL)
 		{
 		  write_enn (own_buf);
 		  break;

gdb/gdbserver/thread-db.c

@@ -733,25 +733,12 @@ thread_db_init (void)
   return 0;
 }
 
-static int
-any_thread_of (struct inferior_list_entry *entry, void *args)
-{
-  int *pid_p = (int *) args;
-
-  if (ptid_get_pid (entry->id) == *pid_p)
-    return 1;
-
-  return 0;
-}
-
 static void
 switch_to_process (struct process_info *proc)
 {
   int pid = pid_of (proc);
 
-  current_thread =
-    (struct thread_info *) find_inferior (&all_threads,
-					  any_thread_of, &pid);
+  current_thread = find_any_thread_of_pid (pid);
 }
 
 /* Disconnect from libthread_db and free resources.  */

gdb/gdbserver/tracepoint.c

@@ -3956,17 +3956,6 @@ cmd_qtstmat (char *packet)
     run_inferior_command (packet, strlen (packet) + 1);
 }
 
-/* Helper for gdb_agent_about_to_close.
-   Return non-zero if thread ENTRY is in the same process in DATA.  */
-
-static int
-same_process_p (struct inferior_list_entry *entry, void *data)
-{
-  int *pid = (int *) data;
-
-  return ptid_get_pid (entry->id) == *pid;
-}
-
 /* Sent the agent a command to close it.  */
 
 void
@@ -3981,8 +3970,7 @@ gdb_agent_about_to_close (int pid)
       saved_thread = current_thread;
 
       /* Find any thread which belongs to process PID.  */
-      current_thread = (struct thread_info *)
-	find_inferior (&all_threads, same_process_p, &pid);
+      current_thread = find_any_thread_of_pid (pid);
 
       strcpy (buf, "close");