Re: igc, macOS avoiding signals

["Gerd Möllmann" <gerd.moellmann@gmail.com>]

Pip Cet <pipcet@protonmail.com> writes:

> Does adding mps_message_poll (global_igc->arena) in the signal handler
> produce a crash/deadlock for you?  Last thing I'm asking you to try
> today, I promise :-)

:-). When I do this:

1 file changed, 1 insertion(+)
src/igc.c | 1 +

modified   src/igc.c
@@ -4966,6 +4966,7 @@ igc_alloc_dump (size_t nbytes)
 bool
 igc_busy_p (void)
 {
+  mps_message_poll (global_igc->arena);
   return mps_arena_busy (global_igc->arena);
 }
 

with no changes, except the 1 commit reverted, I get an assertion
a short time after M-x profiler-start

Fatal error 6: Aborted
Backtrace:
0   emacs                               0x0000000104fceca8 emacs_backtrace + 104
1   emacs                               0x000000010515b31c terminate_due_to_signal + 220
2   emacs                               0x00000001050c090c syms_of_igc + 0
3   emacs                               0x00000001051081a4 LockClaim + 144
4   emacs                               0x0000000105107f78 ArenaEnterLock + 96
5   emacs                               0x00000001050fa380 mps_message_poll + 24
6   emacs                               0x00000001050c008c igc_busy_p + 28
7   emacs                               0x00000001050b8a54 add_sample + 44
8   emacs                               0x0000000104fce6fc deliver_process_signal + 64
9   libsystem_platform.dylib            0x0000000190c56e04 _sigtramp + 56
10  libsystem_c.dylib                   0x0000000190ad9ba4 clock + 52
11  emacs                               0x00000001050f4c10 ArenaPoll + 164
12  emacs                               0x00000001050f5b68 mps_ap_fill + 160
13  emacs                               0x00000001050c0f24 alloc_impl + 128
14  emacs                               0x00000001050bf290 igc_add_marker + 136
15  emacs                               0x0000000104fe21cc set_marker_internal + 576
16  emacs                               0x0000000104fe2700 Fcopy_marker + 180
17  emacs                               0x0000000104f558b0 save_window_save + 748
18  emacs                               0x0000000104f555ac Fcurrent_window_configuration + 296
19  emacs                               0x0000000104fe3bfc Fread_from_minibuffer + 1044
20  minibuffer-1b0f548b-1c53371b.eln    0x0000000106a680f4
F636f6d706c6574696e672d726561642d64656661
...