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binutils-gdb
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2001-04-26 Michael Snyder <msnyder@redhat.com> 

* thread-db.c (_initialize_thread_db): Add set/show command
	"debug-linux-threads" for debugging output.
	* lin-lwp.c (various): Use global "debug_linux_threads to
	turn on extra debugging output.
This commit is contained in:
Michael Snyder 2001-04-26 23:14:20 +00:00
parent 4c8de859cc
commit 20b8570d73
3 changed files with 49 additions and 42 deletions
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4
gdb/ChangeLog
View File

@ -1,5 +1,9 @@
2001-04-26 Michael Snyder <msnyder@redhat.com>
* thread-db.c (_initialize_thread_db): Add set/show command
"debug-linux-threads" for debugging output.
* lin-lwp.c (various): Use global "debug_linux_threads to
turn on extra debugging output.
* lin-lwp.c: Minor cleanups in comments.
* target.c (normal_pid_to_str): Get rid of an ancient hack.
* remote.c (remote_pid_to_str): New function for remote target.

61
gdb/lin-lwp.c
View File

@ -31,11 +31,8 @@
#include "target.h"
#include "regcache.h"
#define DEBUG 1
#if DEBUG
extern int debug_linux_threads;
extern const char *strsignal (int sig);
#endif
/* On Linux there are no real LWP's. The closest thing to LWP's are
processes sharing the same VM space. A multi-threaded process is
@ -521,9 +518,9 @@ stop_wait_callback (struct lwp_info *lp, void *data)
printf_unfiltered ("[%s exited]\n",
target_pid_to_str (lp->pid));
}
#if DEBUG
printf ("%s exited.\n", target_pid_to_str (lp->pid));
#endif
if (debug_linux_threads)
printf ("%s exited.\n", target_pid_to_str (lp->pid));
delete_lwp (lp->pid);
return 0;
}
@ -549,21 +546,21 @@ stop_wait_callback (struct lwp_info *lp, void *data)
If we do not do this, then we run the risk that the
user will delete or disable the breakpoint, but the
thread will have already tripped on it. */
#if DEBUG
printf ("Tripped breakpoint at %lx in LWP %d"
" while waiting for SIGSTOP.\n",
(long) read_pc_pid (lp->pid), pid);
#endif
if (debug_linux_threads)
printf ("Tripped breakpoint at %lx in LWP %d"
" while waiting for SIGSTOP.\n",
(long) read_pc_pid (lp->pid), pid);
/* Set the PC to before the trap. */
if (DECR_PC_AFTER_BREAK)
write_pc_pid (read_pc_pid (pid) - DECR_PC_AFTER_BREAK, pid);
}
else
{
#if DEBUG
printf ("Received %s in LWP %d while waiting for SIGSTOP.\n",
strsignal (WSTOPSIG (status)), pid);
#endif
if (debug_linux_threads)
printf ("Received %s in LWP %d while waiting for SIGSTOP.\n",
strsignal (WSTOPSIG (status)), pid);
/* The thread was stopped with a signal other than
SIGSTOP, and didn't accidentiliy trip a breakpoint.
Record the wait status. */
@ -620,10 +617,9 @@ lin_lwp_wait (int pid, struct target_waitstatus *ourstatus)
lp = iterate_over_lwps (status_callback, NULL);
if (lp)
{
#if DEBUG
printf ("Using pending wait status for LWP %d.\n",
GET_LWP (lp->pid));
#endif
if (debug_linux_threads)
printf ("Using pending wait status for LWP %d.\n",
GET_LWP (lp->pid));
status = lp->status;
lp->status = 0;
}
@ -635,19 +631,18 @@ lin_lwp_wait (int pid, struct target_waitstatus *ourstatus)
}
else if (is_lwp (pid))
{
#if DEBUG
printf ("Waiting for specific LWP %d.\n", GET_LWP (pid));
#endif
if (debug_linux_threads)
printf ("Waiting for specific LWP %d.\n", GET_LWP (pid));
/* We have a specific LWP to check. */
lp = find_lwp_pid (GET_LWP (pid));
gdb_assert (lp);
status = lp->status;
lp->status = 0;
#if DEBUG
if (status)
if (debug_linux_threads)
if (status)
printf ("Using pending wait status for LWP %d.\n",
GET_LWP (lp->pid));
#endif
/* If we have to wait, take into account whether PID is a cloned
process or not. And we have to convert it to something that
@ -725,9 +720,9 @@ lin_lwp_wait (int pid, struct target_waitstatus *ourstatus)
printf_unfiltered ("[%s exited]\n",
target_pid_to_str (lp->pid));
}
#if DEBUG
printf ("%s exited.\n", target_pid_to_str (lp->pid));
#endif
if (debug_linux_threads)
printf ("%s exited.\n", target_pid_to_str (lp->pid));
delete_lwp (lp->pid);
/* Make sure there is at least one thread running. */
@ -743,10 +738,10 @@ lin_lwp_wait (int pid, struct target_waitstatus *ourstatus)
if (lp->signalled && WIFSTOPPED (status)
&& WSTOPSIG (status) == SIGSTOP)
{
#if DEBUG
printf ("Delayed SIGSTOP caught for %s.\n",
target_pid_to_str (lp->pid));
#endif
if (debug_linux_threads)
printf ("Delayed SIGSTOP caught for %s.\n",
target_pid_to_str (lp->pid));
/* This is a delayed SIGSTOP. */
lp->signalled = 0;

26
gdb/thread-db.c
View File

@ -31,12 +31,16 @@
#include "symfile.h"
#include "objfiles.h"
#include "target.h"
#include "command.h"
#include "gdbcmd.h"
#include "regcache.h"
#ifndef LIBTHREAD_DB_SO
#define LIBTHREAD_DB_SO "libthread_db.so.1"
#endif
int debug_linux_threads = 0; /* Set non-zero for debugging output. */
/* If we're running on Linux, we must explicitly attach to any new threads. */
/* FIXME: There is certainly some room for improvements:
@ -51,7 +55,7 @@ static struct target_ops thread_db_ops;
static struct target_ops *target_beneath;
/* Pointer to the next function on the objfile event chain. */
static void (*target_new_objfile_chain) (struct objfile *objfile);
static void (*new_objfile_event_chain) (struct objfile *objfile);
/* Non-zero if we're using this module's target vector. */
static int using_thread_db;
@ -588,8 +592,8 @@ thread_db_new_objfile (struct objfile *objfile)
}
quit:
if (target_new_objfile_chain)
target_new_objfile_chain (objfile);
if (new_objfile_event_chain)
new_objfile_event_chain (objfile);
}
static void
@ -697,11 +701,10 @@ check_event (int pid)
error ("Thread creation event doesn't match breakpoint.");
#endif
/* 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 (pid))
attach_thread (pid, msg.th_p, &ti, 1);
if (in_thread_list (pid))
error ("Spurious thread creation event.");
attach_thread (pid, msg.th_p, &ti, 1);
return;
case TD_DEATH:
@ -1023,7 +1026,12 @@ _initialize_thread_db (void)
add_target (&thread_db_ops);
/* Add ourselves to objfile event chain. */
target_new_objfile_chain = target_new_objfile_hook;
new_objfile_event_chain = target_new_objfile_hook;
target_new_objfile_hook = thread_db_new_objfile;
}
add_show_from_set (add_set_cmd ("debug-linux-threads", class_support,
var_boolean, (char *) &debug_linux_threads,
"Set debug output for linux-threads \
on or off.\nUse \"on\" to enable, \"off\" to disable.", &setlist),
&showlist);
}