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* lin-lwp.c (stop_wait_callback): Add support for flushing

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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.
This commit is contained in:
Mark Kettenis 2001-07-12 19:37:36 +00:00
parent 635b0cc19c
commit de4ca854d8
2 changed files with 31 additions and 14 deletions
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6
gdb/ChangeLog
View file

@ -1,5 +1,11 @@
2001-07-12 Mark Kettenis <kettenis@gnu.org>
* lin-lwp.c (stop_wait_callback): Add support for flushing
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.
* i386-tdep.c (i386_extract_return_value): Undo 2001-07-11 changes
to comment.
(i386_store_return_value): Improve comments about storing

39
gdb/lin-lwp.c
View file

@ -595,11 +595,14 @@ stop_callback (struct lwp_info *lp, void *data)
return 0;
}
/* Wait until LP is stopped. */
/* Wait until LP is stopped. If DATA is non-null it is interpreted as
a pointer to a set of signals to be flushed immediately. */
static int
stop_wait_callback (struct lwp_info *lp, void *data)
{
sigset_t *flush_mask = data;
if (! lp->stopped && lp->signalled)
{
pid_t pid;
@ -639,6 +642,13 @@ stop_wait_callback (struct lwp_info *lp, void *data)
gdb_assert (WIFSTOPPED (status));
/* Ignore any signals in FLUSH_MASK. */
if (flush_mask && sigismember (flush_mask, WSTOPSIG (status)))
{
ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0);
return stop_wait_callback (lp, flush_mask);
}
if (WSTOPSIG (status) != SIGSTOP)
{
if (WSTOPSIG (status) == SIGTRAP)
@ -673,18 +683,6 @@ stop_wait_callback (struct lwp_info *lp, void *data)
lp->status = status;
return 0;
}
else if (WSTOPSIG (status) == SIGINT &&
signal_pass_state (SIGINT) == 0)
{
/* Since SIGINT gets forwarded to the entire process group
(in the case where ^C/BREAK is typed at the tty/console),
just ignore all SIGINT events from all lwp's except for
the one that was caught by lin_lwp_wait. */
/* Now resume this LWP and get the SIGSTOP event. */
ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0);
return stop_wait_callback (lp, data);
}
else
{
/* The thread was stopped with a signal other than
@ -897,6 +895,9 @@ lin_lwp_wait (ptid_t ptid, struct target_waitstatus *ourstatus)
int options = 0;
int status = 0;
pid_t pid = PIDGET (ptid);
sigset_t flush_mask;
sigemptyset (&flush_mask);
/* Make sure SIGCHLD is blocked. */
if (! sigismember (&blocked_mask, SIGCHLD))
@ -1113,6 +1114,16 @@ lin_lwp_wait (ptid_t ptid, struct target_waitstatus *ourstatus)
status = 0;
goto retry;
}
if (signo == TARGET_SIGNAL_INT
&& signal_pass_state (signo) == 0)
{
/* If ^C/BREAK is typed at the tty/console, SIGINT gets
forwarded to the entire process group, that is, all LWP's
will receive it. Since we only want to report it once,
we try to flush it from all LWPs except this one. */
sigaddset (&flush_mask, SIGINT);
}
}
/* This LWP is stopped now. */
@ -1127,7 +1138,7 @@ lin_lwp_wait (ptid_t ptid, struct target_waitstatus *ourstatus)
/* ... and wait until all of them have reported back that they're no
longer running. */
iterate_over_lwps (stop_wait_callback, NULL);
iterate_over_lwps (stop_wait_callback, &flush_mask);
/* If we're not waiting for a specific LWP, choose an event LWP from
among those that have had events. Giving equal priority to all