#define LIBTHREAD_DB_SO "libthread_db.so.1"
#endif
-/* If we're running on Linux, we must explicitly attach to any new threads. */
+/* If we're running on GNU/Linux, we must explicitly attach to any new
+ threads. */
/* FIXME: There is certainly some room for improvements:
- Cache LWP ids.
/* Non-zero if we're using this module's target vector. */
static int using_thread_db;
-/* Non-zero if we musn't deactivate this module's target vector. */
+/* Non-zero if we have to keep this module's target vector active
+ across re-runs. */
static int keep_thread_db;
/* Non-zero if we have determined the signals used by the threads
/* Building process ids. */
-#ifndef TIDGET
-#define TIDGET(PID) (((PID) & 0x7fffffff) >> 16)
-#define PIDGET0(PID) (((PID) & 0xffff))
-#define PIDGET(PID) ((PIDGET0 (PID) == 0xffff) ? -1 : PIDGET0 (PID))
-#define MERGEPID(PID, TID) (((PID) & 0xffff) | ((TID) << 16))
-#endif
-
-#define THREAD_FLAG 0x80000000
-
-#define is_lwp(pid) (((pid) & THREAD_FLAG) == 0 && TIDGET (pid))
-#define is_thread(pid) ((pid) & THREAD_FLAG)
+#define GET_PID(ptid) ptid_get_pid (ptid)
+#define GET_LWP(ptid) ptid_get_lwp (ptid)
+#define GET_THREAD(ptid) ptid_get_tid (ptid)
-#define GET_PID(pid) PIDGET (pid)
-#define GET_LWP(pid) TIDGET (pid)
-#define GET_THREAD(pid) TIDGET (pid)
+#define is_lwp(ptid) (GET_LWP (ptid) != 0)
+#define is_thread(ptid) (GET_THREAD (ptid) != 0)
-#define BUILD_LWP(tid, pid) MERGEPID (pid, tid)
-#define BUILD_THREAD(tid, pid) (MERGEPID (pid, tid) | THREAD_FLAG)
+#define BUILD_LWP(lwp, pid) ptid_build (pid, lwp, 0)
+#define BUILD_THREAD(tid, pid) ptid_build (pid, 0, tid)
\f
struct private_thread_info
/* Cached LWP id. Must come first, see lin-lwp.c. */
lwpid_t lwpid;
};
-
-\f
-/* Helper functions. */
-
-static void
-restore_inferior_ptid (void *arg)
-{
- ptid_t *saved_ptid_ptr = arg;
- inferior_ptid = *saved_ptid_ptr;
- xfree (arg);
-}
-
-static struct cleanup *
-save_inferior_ptid (void)
-{
- ptid_t *saved_ptid_ptr;
-
- saved_ptid_ptr = xmalloc (sizeof (ptid_t));
- *saved_ptid_ptr = inferior_ptid;
- return make_cleanup (restore_inferior_ptid, saved_ptid_ptr);
-}
\f
static char *
err = td_ta_map_lwp2thr_p (thread_agent, GET_LWP (ptid), &th);
if (err != TD_OK)
- error ("Cannot find user-level thread for LWP %d: %s",
+ error ("Cannot find user-level thread for LWP %ld: %s",
GET_LWP (ptid), thread_db_err_str (err));
err = td_thr_get_info_p (&th, &ti);
td_thrhandle_t th;
td_err_e err;
- if (! is_thread (ptid))
+ if (!is_thread (ptid))
return ptid;
err = td_ta_map_id2thr_p (thread_agent, GET_THREAD (ptid), &th);
err = td_ta_event_addr_p (thread_agent, TD_DEATH, ¬ify);
if (err != TD_OK)
{
- warning ("Unable to get location for thread creation breakpoint: %s",
+ warning ("Unable to get location for thread death breakpoint: %s",
thread_db_err_str (err));
return;
}
check_thread_signals (void)
{
#ifdef GET_THREAD_SIGNALS
- if (! thread_signals)
+ if (!thread_signals)
{
sigset_t mask;
int i;
#endif
}
-static void
-deactivate_target (void)
-{
- /* Forget about the child's process ID. We shouldn't need it
- anymore. */
- proc_handle.pid = 0;
-
- if (! keep_thread_db)
- {
- using_thread_db = 0;
- unpush_target (&thread_db_ops);
- }
-}
-
static void
thread_db_new_objfile (struct objfile *objfile)
{
td_err_e err;
- if (objfile == NULL)
+ /* Don't attempt to use thread_db on targets which can not run
+ (core files). */
+ if (objfile == NULL || !target_has_execution)
{
/* All symbols have been discarded. If the thread_db target is
- active, deactivate it now, even if the application was linked
- statically against the thread library. */
- keep_thread_db = 0;
+ active, deactivate it now. */
if (using_thread_db)
- deactivate_target ();
+ {
+ gdb_assert (proc_handle.pid == 0);
+ unpush_target (&thread_db_ops);
+ using_thread_db = 0;
+ }
+
+ keep_thread_db = 0;
goto quit;
}
tp->private = xmalloc (sizeof (struct private_thread_info));
tp->private->lwpid = ti_p->ti_lid;
- /* Under Linux, we have to attach to each and every thread. */
+ if (ti_p->ti_state == TD_THR_UNKNOWN || ti_p->ti_state == TD_THR_ZOMBIE)
+ return; /* A zombie thread -- do not attach. */
+
+ /* Under GNU/Linux, we have to attach to each and every thread. */
#ifdef ATTACH_LWP
- if (ti_p->ti_lid != GET_PID (ptid))
- ATTACH_LWP (BUILD_LWP (ti_p->ti_lid, GET_PID (ptid)), 0);
+ ATTACH_LWP (BUILD_LWP (ti_p->ti_lid, GET_PID (ptid)), 0);
#endif
/* Enable thread event reporting for this thread. */
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)
{
thread_db_detach (char *args, int from_tty)
{
disable_thread_event_reporting ();
- deactivate_target ();
+
+ /* There's no need to save & restore inferior_ptid here, since the
+ inferior is supposed to be 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);
}
/* We may already know about this thread, for instance when the
user has issued the `info threads' command before the SIGTRAP
for hitting the thread creation breakpoint was reported. */
- if (! in_thread_list (ptid))
+ if (!in_thread_list (ptid))
attach_thread (ptid, msg.th_p, &ti, 1);
return;
error ("Thread death event doesn't match breakpoint.");
#endif
- if (! in_thread_list (ptid))
+ if (!in_thread_list (ptid))
error ("Spurious thread death event.");
detach_thread (ptid, 1);
{
/* FIXME: This seems to be necessary to make sure breakpoints
are removed. */
- if (! target_thread_alive (inferior_ptid))
+ if (!target_thread_alive (inferior_ptid))
inferior_ptid = pid_to_ptid (GET_PID (inferior_ptid));
else
inferior_ptid = lwp_from_thread (inferior_ptid);
gdb_prfpregset_t fpregset;
td_err_e err;
- if (! is_thread (inferior_ptid))
+ if (!is_thread (inferior_ptid))
{
/* Pass the request to the target beneath us. */
target_beneath->to_fetch_registers (regno);
gdb_prfpregset_t fpregset;
td_err_e err;
- if (! is_thread (inferior_ptid))
+ if (!is_thread (inferior_ptid))
{
/* Pass the request to the target beneath us. */
target_beneath->to_store_registers (regno);
static void
thread_db_kill (void)
{
+ /* There's no need to save & restore inferior_ptid here, since the
+ inferior isn't supposed to survive this function call. */
+ inferior_ptid = lwp_from_thread (inferior_ptid);
target_beneath->to_kill ();
}
static void
thread_db_create_inferior (char *exec_file, char *allargs, char **env)
{
+ if (!keep_thread_db)
+ {
+ unpush_target (&thread_db_ops);
+ using_thread_db = 0;
+ }
+
target_beneath->to_create_inferior (exec_file, allargs, env);
}
/* ...and perform the remaining initialization steps. */
enable_thread_event_reporting ();
- thread_db_find_new_threads();
+ thread_db_find_new_threads ();
}
}
thread_db_mourn_inferior (void)
{
remove_thread_event_breakpoints ();
- deactivate_target ();
+
+ /* Forget about the child's process ID. We shouldn't need it
+ anymore. */
+ proc_handle.pid = 0;
target_beneath->to_mourn_inferior ();
}
static int
thread_db_thread_alive (ptid_t ptid)
{
+ td_thrhandle_t th;
+ td_thrinfo_t ti;
+ td_err_e err;
+
if (is_thread (ptid))
{
- td_thrhandle_t th;
- td_err_e err;
-
err = td_ta_map_id2thr_p (thread_agent, GET_THREAD (ptid), &th);
if (err != TD_OK)
return 0;
if (err != TD_OK)
return 0;
+ err = td_thr_get_info_p (&th, &ti);
+ if (err != TD_OK)
+ return 0;
+
+ if (ti.ti_state == TD_THR_UNKNOWN || ti.ti_state == TD_THR_ZOMBIE)
+ return 0; /* A zombie thread. */
+
return 1;
}
if (err != TD_OK)
error ("Cannot get thread info: %s", thread_db_err_str (err));
+ if (ti.ti_state == TD_THR_UNKNOWN || ti.ti_state == TD_THR_ZOMBIE)
+ return 0; /* A zombie -- ignore. */
+
ptid = BUILD_THREAD (ti.ti_tid, GET_PID (inferior_ptid));
- if (! in_thread_list (ptid))
+ if (!in_thread_list (ptid))
attach_thread (ptid, th_p, &ti, 1);
return 0;
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;
projects / deliverable / binutils-gdb.git / blobdiff