* linux-nat.h: New file.
* linux-nat.c: Include linux-nat.h.
* lin-lwp.c: Include linux-nat.h.
Move struct lwp_info def to linux-nat.h.
* linux-proc.c: Include linux-nat.h.
(linux_make_note_section): Iterate over lwps instead of threads.
(linux_do_thread_registers): Use lwp instead of merged pid.
* config/nm-linux.h: Move miscelaneous def'ns to linux-nat.h.
* Makefile.in (lin-lwp.o, linux-proc.o, linux-nat.o):
Add dependency on linux_nat_h.
* acconfig.h: Add HAVE_TKILL_SYSCALL definition check.
* config.in: Regenerated.
* configure.in: Add test for syscall function and check for
__NR_tkill macro in <syscall.h> to set HAVE_TKILL_SYSCALL.
* configure: Regenerated.
* lin-lwp.c [HAVE_TKILL_SYSCALL]: Include <unistd.h> and
<sys/syscall.h>.
(kill_lwp): New function that uses tkill syscall or
uses kill, depending on whether threading model is nptl or not.
All callers of kill() changed to use kill_lwp().
(lin_lwp_wait): Make special check when WIFEXITED occurs to
see if all threads have already exited in the nptl model.
(stop_and_resume_callback): New callback function used by the
lin_lwp_wait thread exit handling code.
(stop_wait_callback): Check for threads already having exited and
delete such threads fromt the lwp list when discovered.
(stop_callback): Don't assert retcode of kill call.
Roland McGrath <roland@redhat.com>
* i386-linux-nat.c (ps_get_thread_area): New function needed by
nptl libthread_db.
* sparc-nat.c (fetch_inferior_registers)
(store_inferior_registers): Add comment on problem of LWP vs
threads.
From 2002-11-21 Daniel Jacobowitz <drow@mvista.com>
* lin-lwp.c (lin_lwp_fetch_registers): Remove.
(lin_lwp_store_registers): Remove.
(init_lin_lwp_ops): Use fetch_inferior_registers
and store_inferior_registers directly.
* sparc-nat.c (fetch_inferior_registers): Honor LWP ID.
(store_inferior_registers): Likewise.
Fix PR gdb/725.
* lin-lwp.c (struct lwp_info): Add new member `cloned'.
(is_cloned) Removed.
(lin_lwp_attach_lwp): Don't call stop_wait_callback. Instead call
waitpid explicitly. Mark the LWP as cloned if waitpid fails and
retry with __WCLONE flag.
(lin_lwp_attach): Likewise. Warn if attaching to a cloned process.
(detach_callback): Replace use of is_cloned with explicit check on
LWP id and process id.
(stop_wait_callback): Replace use of is_cloned with check if LWP
is marked as cloned.
[CHILD_WAIT] (child_wait): New function.
(lin_lwp_wait): Replace use of is_cloned with check if LWP is
marked as cloned. Mark newly detected LWPs as cloned if detected
by waitpid with __WCLONE flag.
(kill_wait_callback): Replace use of is_cloned with check if LWP
is marked as cloned.
* config/i386/nm-linux.h (struct target_waitstatus): Add forward
declaration.
(child_wait): Add prototype.
(CHILD_WAIT): Define.
signals. Use that in favour of the old code to get rid of
superfluous SIGINTs.
(lin_lwp_wait): Use the new support in stop_wait_callback to
flush all but one SIGINT.
commented with "paranoia" into gdb_assert.
(select_event_lwp_callback): Likewise.
(cancel_breakpoints_callback): Bail out early if LP is the event
LWP. Add comment about backup up breakpoints. Fix formatting and
debug message.
(select_event_lwp): Make solely repsonsible for switching event
LWP. Fix formatting and remove bogus "ERROR" debug message.
Don't backup breakpoints from here.
(lin_lwp_wait): Don't touch LP->status, let select_event_lwp
handle that. Only call select_event_lwp if we're not waiting for
a specific LWP, i.e. when PID == -1. Backup breakpoints from here.
* lin-lwp.c: Prevent thread starvation by using a monte carlo
method to choose which of several event threads to handle next.
(stop_wait_callback): Defer pushback of breakpoint events until
later; add SIGTRAP events to the queue of unhandled events.
Keep calling waitpid until SIGSTOP retrieved. If more than one
non-SIGSTOP event is retrieved, push them back onto the process
queue using kill.
(count_events_callback, select_singlestep_lwp_callback,
select_event_lwp_callback, cancel_breakpoints_callback,
select_event_lwp): New functions. Implement monte carlo method
for selecting which of several SIGTRAP threads to handle next.
Push back the breakpoint event for all threads other than the
selected one.
(lin_lwp_wait): Call select_event_lwp to decide which of several
sigtrapped lwps to handle next.
(resume_callback): Disable code that attempts to handle
step_resume breakpoints. Let core gdb handle this.
(iterate_over_lwps): Make sure we can handle CALLBACK deleting the
LWP it's called for.
(lin_lwp_attach): Mark LWP as resumed to make sure the fake
SIGSTOP is reported.
(resume_clear_callback): New function.
(resume_set_callback): New function.
(lin_lwp_resume): Mark all LWP's that we're going to resume as
resumed, and unmark all others.
(status_callback): Only report a pending wait status if we pretend
that LP has been resumed.
(resumed_callback): New function.
(lin_lwp_wait): Add assertions to check that LWP's are properly
marked as resumed. Partially revert 2001-05-25 patch by Michael
Snyder: do not resume all threads. Add comment explaining the
problems associated with this bit of code.
stopped due to a Ctrl-C as well as breakpoints.
* hppa-tdep.c (hppa_prepare_to_proceed): Add FIXME as this may not
support thread switches after Ctrl-C.
* lin-lwp.c (lin_lwp_prepare_to_proceed): Ditto.
* linux-thread.c (linuxthreads_prepare_to_proceed): Ditto.
* m3-nat.c (mach3_prepare_to_proceed): Ditto.
* lin-lwp.c (lin_lwp_attach_lwp): Call stop_wait_callback,
to consume the SIGSTOP generated by PTRACE_ATTACH.
(stop_wait_callback): If a SIGTRAP or a SIGINT event is consumed,
try again to get the SIGSTOP event.
(lin_lwp_wait): Resume all threads when ignoring a signal.
This will insure that newly attached threads get resumed.
* thread-db.c (keep_thread_db): Adjust comment.
(deactivate_target): Removed.
(thread_db_new_objfile): Don't call deactivate_target. Implement
guts of deactivate_target inline instead.
(attach_thread): Call ATTACH_LWP unconditionally if defined.
(thread_db_attach): New function.
(thread_db_detach): Don't call deactivate_target. Do necessary
cleanup inline instead. Set inferior_ptid to LWP corresponding to
the current user-level thread.
(thread_db_kill): Set inferior_ptid to LWP corresponding to the
current user-level thread.
(thread_db_create_inferior): Deactivate target vector if
KEEP_THREAD_DB is zero.
(thread_db_mourn_inferior): Don't call deactivate_target. Do
necessary cleanup inline instead.
(init_thread_db_ops): Initialize to_attach field to
thread_db_attach.
* lin-lwp.c (lin_lwp_mourn_inferior): Remove prototype.
(stop_wait_callback): Add prototype.
(init_lwp_list): Add comment about when to re-initialize the LWP
list.
(lin_lwp_attach_lwp): Only call ptrace for cloned processes.
Avoid adding publicates to the LWP list. Only mark an LWP as
signalled if it doesn't correspond to a cloned process.
(lin_lwp_attach): Add initial process to the LWP list. Make sure
it's stopped and fake a SIGSTOP.
(detach_callback): New function.
(lin_lwp_detach): Implement.
(lin_lwp_create_inferior): Don't re-initialize LWP list here.
Call child_ops.to_create_inferior directly instead of via
target_beneath local.
(lin_lwp_mourn_inferior): Call child_ops.to_mourn_inferior
directly instead of via target_beneath local.
* thread-db.c: Revert 2001-04-26 change for debugging output.
* lin-lwp.c: Ditto.
* lin-lwp.c: Add set/show debug lin-lwp command. Use this
command to turn extra debugging output on / off.
* 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.
* arch-utils.c (default_prepare_to_proceed)
(generic_prepare_to_proceed): Added new functions.
* arch-utils.h: New function declarations for
default_prepare_to_proceed() and generic_prepare_to_proceed().
* gdbarch.sh: Added PREPARE_TO_PROCEED.
* gdbarch.c: Regenerated.
* gdbarch.h: Regenerated.
* inferior.h: Added get_last_target_status() declaration.
* infrun.c (get_last_target_status): Added new function.
(handle_inferior_event): Saves last pid and waitstatus, which will
get returned by get_last_target_status().
* hppa-tdep.c (prepare_to_proceed): Added comment stating that
prepare_to_proceed() is potentially redundant since
default_prepare_to_proceed() has been added.
* linux-thread.c (prepare_to_proceed): Ditto.
* lin-lwp.c (prepare_to_proceed): Ditto.
* m3-nat.c (prepare_to_proceed): Ditto.
(lin_lwp_wait): Block SIGCHLD here if it isn't already blocked.
(lin_lwp_mourn_inferior): Restore the origional signal mask, and
reset the mask of blocked signals.
(_initialize_lin_lwp): Don't block SIGCHLD here, but do initialize
suspend_mask and blocked_mask. This makes us pass
gdb.base/sigall.exp for Linux/x86 now.
(lin_thread_get_thread_signals): Treat the LinuxThreads "cancel"
signal similarly to SIGCHLD in the generic code. Avoids GDB being
terminated by a Real-time signal.
GET_THREAD_SIGNALS): New defines.
* config/i386/linux.mh (NATDEPFILES): Remove lin-thread.o and
linux-threads.o. Add proc-service.o, thread-db.o and lin-lwp.o.
* proc-service.c: New file.
* thread-db.c: New file.
* lin-lwp.c: New file.
Michael Snyder