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* linux-thread-db.c (thread_db_attach): Delete.

Browse Source 
(thread_db_detach): Typo fix.  Call target_mourn_inferior
	instead of fixing up proc_handle.
	(have_threads_callback, have_threads): New functions.
	(thread_db_wait): Remove dead proc_handle.pid check.  Only
	translate PTIDs if we have registered threads.  Check for new
	threads if we have none.
	(thread_db_create_inferior, thread_db_post_startup_inferior): Delete.
	(find_new_threads_callback): Only enable event reporting if TID == 0.
	(same_ptid_callback): New.
	(thread_db_get_thread_local_address): Check for new threads.
	(init_thread_db_ops): Don't set to_attach, to_create_inferior,
	or to_post_startup_inferior.

	* thread-db.c (thread_db_find_new_threads): Add prototype.
	(thread_db_create_event): Check for the main thread before adding
	a new thread.
	(maybe_attach_thread): Only enable event reporting if TID == 0.
	(thread_db_get_tls_address): Check for new threads.
This commit is contained in:
Daniel Jacobowitz 2007-06-27 11:52:02 +00:00
parent 58eb693ef1
commit 4105de343e
4 changed files with 133 additions and 66 deletions
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16
gdb/ChangeLog
View File

@ -1,3 +1,19 @@
2007-06-27 Daniel Jacobowitz <dan@codesourcery.com>
* linux-thread-db.c (thread_db_attach): Delete.
(thread_db_detach): Typo fix. Call target_mourn_inferior
instead of fixing up proc_handle.
(have_threads_callback, have_threads): New functions.
(thread_db_wait): Remove dead proc_handle.pid check. Only
translate PTIDs if we have registered threads. Check for new
threads if we have none.
(thread_db_create_inferior, thread_db_post_startup_inferior): Delete.
(find_new_threads_callback): Only enable event reporting if TID == 0.
(same_ptid_callback): New.
(thread_db_get_thread_local_address): Check for new threads.
(init_thread_db_ops): Don't set to_attach, to_create_inferior,
or to_post_startup_inferior.
2007-06-22 Ulrich Weigand <uweigand@de.ibm.com>
* infrun.c (adjust_pc_after_break): Do not assume software single-step

8
gdb/gdbserver/ChangeLog
View File

@ -1,3 +1,11 @@
2007-06-27 Daniel Jacobowitz <dan@codesourcery.com>
* thread-db.c (thread_db_find_new_threads): Add prototype.
(thread_db_create_event): Check for the main thread before adding
a new thread.
(maybe_attach_thread): Only enable event reporting if TID == 0.
(thread_db_get_tls_address): Check for new threads.
2007-06-20 Daniel Jacobowitz <dan@codesourcery.com>
* linux-low.c (linux_create_inferior): Try execv before execvp.

29
gdb/gdbserver/thread-db.c
View File

@ -41,6 +41,7 @@ static struct ps_prochandle proc_handle;
/* Connection to the libthread_db library. */
static td_thragent_t *thread_agent;
static void thread_db_find_new_threads (void);
static int find_new_threads_callback (const td_thrhandle_t *th_p, void *data);
static char *
@ -135,6 +136,8 @@ thread_db_create_event (CORE_ADDR where)
td_event_msg_t msg;
td_err_e err;
struct inferior_linux_data *tdata;
struct thread_info *inferior;
struct process_info *process;
if (debug_threads)
fprintf (stderr, "Thread creation event.\n");
@ -150,6 +153,14 @@ thread_db_create_event (CORE_ADDR where)
fprintf (stderr, "thread getmsg err: %s\n",
thread_db_err_str (err));
/* If we do not know about the main thread yet, this would be a good time to
find it. We need to do this to pick up the main thread before any newly
created threads. */
inferior = (struct thread_info *) all_threads.head;
process = get_thread_process (inferior);
if (process->thread_known == 0)
thread_db_find_new_threads ();
/* msg.event == TD_EVENT_CREATE */
find_new_threads_callback (msg.th_p, NULL);
@ -232,8 +243,24 @@ maybe_attach_thread (const td_thrhandle_t *th_p, td_thrinfo_t *ti_p)
{
inferior = (struct thread_info *) all_threads.head;
process = get_thread_process (inferior);
if (process->thread_known == 0)
{
/* If the new thread ID is zero, a final thread ID will be
available later. Do not enable thread debugging yet. */
if (ti_p->ti_tid == 0)
{
err = td_thr_event_enable (th_p, 1);
if (err != TD_OK)
error ("Cannot enable thread event reporting for %d: %s",
ti_p->ti_lid, thread_db_err_str (err));
return;
}
if (process->lwpid != ti_p->ti_lid)
fatal ("PID mismatch! Expected %ld, got %ld",
(long) process->lwpid, (long) ti_p->ti_lid);
/* Switch to indexing the threads list by TID. */
change_inferior_id (&all_threads, ti_p->ti_tid);
goto found;
@ -331,6 +358,8 @@ thread_db_get_tls_address (struct thread_info *thread, CORE_ADDR offset,
struct process_info *process;
process = get_thread_process (thread);
if (!process->thread_known)
thread_db_find_new_threads ();
if (!process->thread_known)
return TD_NOTHR;

146
gdb/linux-thread-db.c
View File

@ -220,6 +220,21 @@ thread_db_err_str (td_err_e err)
}
}
/* Return 1 if any threads have been registered. There may be none if
the threading library is not fully initialized yet. */
static int
have_threads_callback (struct thread_info *thread, void *dummy)
{
return 1;
}
static int
have_threads (void)
{
return iterate_over_threads (have_threads_callback, NULL) != NULL;
}
/* A callback function for td_ta_thr_iter, which we use to map all
threads to LWPs.
@ -706,23 +721,6 @@ attach_thread (ptid_t ptid, const td_thrhandle_t *th_p,
target_pid_to_str (ptid), thread_db_err_str (err));
}
static void
thread_db_attach (char *args, int from_tty)
{
target_beneath->to_attach (args, from_tty);
/* Destroy thread info; it's no longer valid. */
init_thread_list ();
/* The child process is now the actual multi-threaded
program. Snatch its process ID... */
proc_handle.pid = GET_PID (inferior_ptid);
/* ...and perform the remaining initialization steps. */
enable_thread_event_reporting ();
thread_db_find_new_threads ();
}
static void
detach_thread (ptid_t ptid, int verbose)
{
@ -749,14 +747,13 @@ thread_db_detach (char *args, int from_tty)
disable_thread_event_reporting ();
/* There's no need to save & restore inferior_ptid here, since the
inferior is supposed to be survive this function call. */
inferior is not supposed to survive this function call. */
inferior_ptid = lwp_from_thread (inferior_ptid);
/* Forget about the child's process ID. We shouldn't need it
anymore. */
proc_handle.pid = 0;
target_beneath->to_detach (args, from_tty);
/* Should this be done by detach_command? */
target_mourn_inferior ();
}
static int
@ -877,12 +874,6 @@ thread_db_wait (ptid_t ptid, struct target_waitstatus *ourstatus)
ptid = target_beneath->to_wait (ptid, ourstatus);
if (proc_handle.pid == 0)
/* The current child process isn't the actual multi-threaded
program yet, so don't try to do any special thread-specific
post-processing and bail out early. */
return ptid;
if (ourstatus->kind == TARGET_WAITKIND_EXITED
|| ourstatus->kind == TARGET_WAITKIND_SIGNALLED)
return pid_to_ptid (-1);
@ -896,23 +887,32 @@ thread_db_wait (ptid_t ptid, struct target_waitstatus *ourstatus)
return pid_to_ptid (GET_PID (ptid));
}
/* If we do not know about the main thread yet, this would be a good time to
find it. */
if (ourstatus->kind == TARGET_WAITKIND_STOPPED && !have_threads ())
thread_db_find_new_threads ();
if (ourstatus->kind == TARGET_WAITKIND_STOPPED
&& ourstatus->value.sig == TARGET_SIGNAL_TRAP)
/* Check for a thread event. */
check_event (ptid);
if (!ptid_equal (trap_ptid, null_ptid))
trap_ptid = thread_from_lwp (trap_ptid);
if (have_threads ())
{
/* Change ptids back into the higher level PID + TID format. If
the thread is dead and no longer on the thread list, we will
get back a dead ptid. This can occur if the thread death
event gets postponed by other simultaneous events. In such a
case, we want to just ignore the event and continue on. */
if (!ptid_equal (trap_ptid, null_ptid))
trap_ptid = thread_from_lwp (trap_ptid);
ptid = thread_from_lwp (ptid);
if (GET_PID (ptid) == -1)
ourstatus->kind = TARGET_WAITKIND_SPURIOUS;
}
/* Change the ptid back into the higher level PID + TID format.
If the thread is dead and no longer on the thread list, we will
get back a dead ptid. This can occur if the thread death event
gets postponed by other simultaneous events. In such a case,
we want to just ignore the event and continue on. */
ptid = thread_from_lwp (ptid);
if (GET_PID (ptid) == -1)
ourstatus->kind = TARGET_WAITKIND_SPURIOUS;
return ptid;
}
@ -925,30 +925,6 @@ thread_db_kill (void)
target_beneath->to_kill ();
}
static void
thread_db_create_inferior (char *exec_file, char *allargs, char **env,
int from_tty)
{
unpush_target (&thread_db_ops);
using_thread_db = 0;
target_beneath->to_create_inferior (exec_file, allargs, env, from_tty);
}
static void
thread_db_post_startup_inferior (ptid_t ptid)
{
if (proc_handle.pid == 0)
{
/* The child process is now the actual multi-threaded
program. Snatch its process ID... */
proc_handle.pid = GET_PID (ptid);
/* ...and perform the remaining initialization steps. */
enable_thread_event_reporting ();
thread_db_find_new_threads ();
}
}
static void
thread_db_mourn_inferior (void)
{
@ -984,6 +960,22 @@ find_new_threads_callback (const td_thrhandle_t *th_p, void *data)
ptid = ptid_build (GET_PID (inferior_ptid), ti.ti_lid, ti.ti_tid);
if (ti.ti_tid == 0)
{
/* A thread ID of zero means that this is the main thread, but
glibc has not yet initialized thread-local storage and the
pthread library. We do not know what the thread's TID will
be yet. Just enable event reporting and otherwise ignore
it. */
err = td_thr_event_enable_p (th_p, 1);
if (err != TD_OK)
error (_("Cannot enable thread event reporting for %s: %s"),
target_pid_to_str (ptid), thread_db_err_str (err));
return 0;
}
if (!in_thread_list (ptid))
attach_thread (ptid, th_p, &ti, 1);
@ -1040,6 +1032,16 @@ thread_db_extra_thread_info (struct thread_info *info)
return NULL;
}
/* Return 1 if this thread has the same LWP as the passed PTID. */
static int
same_ptid_callback (struct thread_info *thread, void *arg)
{
ptid_t *ptid_p = arg;
return GET_LWP (thread->ptid) == GET_LWP (*ptid_p);
}
/* Get the address of the thread local variable in load module LM which
is stored at OFFSET within the thread local storage for thread PTID. */
@ -1048,6 +1050,21 @@ thread_db_get_thread_local_address (ptid_t ptid,
CORE_ADDR lm,
CORE_ADDR offset)
{
/* If we have not discovered any threads yet, check now. */
if (!is_thread (ptid) && !have_threads ())
thread_db_find_new_threads ();
/* Try to find a matching thread if we still have the LWP ID instead
of the thread ID. */
if (!is_thread (ptid))
{
struct thread_info *thread;
thread = iterate_over_threads (same_ptid_callback, &ptid);
if (thread != NULL)
ptid = thread->ptid;
}
if (is_thread (ptid))
{
td_err_e err;
@ -1107,13 +1124,10 @@ init_thread_db_ops (void)
thread_db_ops.to_shortname = "multi-thread";
thread_db_ops.to_longname = "multi-threaded child process.";
thread_db_ops.to_doc = "Threads and pthreads support.";
thread_db_ops.to_attach = thread_db_attach;
thread_db_ops.to_detach = thread_db_detach;
thread_db_ops.to_resume = thread_db_resume;
thread_db_ops.to_wait = thread_db_wait;
thread_db_ops.to_kill = thread_db_kill;
thread_db_ops.to_create_inferior = thread_db_create_inferior;
thread_db_ops.to_post_startup_inferior = thread_db_post_startup_inferior;
thread_db_ops.to_mourn_inferior = thread_db_mourn_inferior;
thread_db_ops.to_find_new_threads = thread_db_find_new_threads;
thread_db_ops.to_pid_to_str = thread_db_pid_to_str;