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+To: vim_dev@googlegroups.com
+Subject: Patch 8.1.0304
+Fcc: outbox
+From: Bram Moolenaar <Bram@moolenaar.net>
+Mime-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+------------
+
+Patch 8.1.0304
+Problem: No redraw when using a STOP signal on Vim and then a CONT signal.
+Solution: Catch the CONT signal and set the terminal to raw mode. This is
+ like 8.1.0244 but without the screen redraw and a fix for
+ multi-threading suggested by Dominique Pelle.
+Files: src/os_unix.c, src/term.c, src/proto/term.pro
+
+
+*** ../vim-8.1.0303/src/os_unix.c 2018-08-20 21:58:53.505410802 +0200
+--- src/os_unix.c 2018-08-21 13:01:23.341522963 +0200
+***************
+*** 1228,1241 ****
+ SIGRETURN;
+ }
+
+- #if defined(_REENTRANT) && defined(SIGCONT)
+ /*
+! * On Solaris with multi-threading, suspending might not work immediately.
+! * Catch the SIGCONT signal, which will be used as an indication whether the
+! * suspending has been done or not.
+ *
+ * On Linux, signal is not always handled immediately either.
+ * See https://bugs.launchpad.net/bugs/291373
+ *
+ * volatile because it is used in signal handler sigcont_handler().
+ */
+--- 1228,1262 ----
+ SIGRETURN;
+ }
+
+ /*
+! * Invoked after receiving SIGCONT. We don't know what happened while
+! * sleeping, deal with part of that.
+! */
+! static void
+! after_sigcont(void)
+! {
+! # ifdef FEAT_TITLE
+! // Don't change "oldtitle" in a signal handler, set a flag to obtain it
+! // again later.
+! oldtitle_outdated = TRUE;
+! # endif
+! settmode(TMODE_RAW);
+! need_check_timestamps = TRUE;
+! did_check_timestamps = FALSE;
+! }
+!
+! #if defined(SIGCONT)
+! static RETSIGTYPE sigcont_handler SIGPROTOARG;
+! static volatile int in_mch_suspend = FALSE;
+!
+! /*
+! * With multi-threading, suspending might not work immediately. Catch the
+! * SIGCONT signal, which will be used as an indication whether the suspending
+! * has been done or not.
+ *
+ * On Linux, signal is not always handled immediately either.
+ * See https://bugs.launchpad.net/bugs/291373
++ * Probably because the signal is handled in another thread.
+ *
+ * volatile because it is used in signal handler sigcont_handler().
+ */
+***************
+*** 1248,1254 ****
+ static RETSIGTYPE
+ sigcont_handler SIGDEFARG(sigarg)
+ {
+! sigcont_received = TRUE;
+ SIGRETURN;
+ }
+ #endif
+--- 1269,1290 ----
+ static RETSIGTYPE
+ sigcont_handler SIGDEFARG(sigarg)
+ {
+! if (in_mch_suspend)
+! {
+! sigcont_received = TRUE;
+! }
+! else
+! {
+! // We didn't suspend ourselves, assume we were stopped by a SIGSTOP
+! // signal (which can't be intercepted) and get a SIGCONT. Need to get
+! // back to a sane mode. We should redraw, but we can't really do that
+! // in a signal handler, do a redraw later.
+! after_sigcont();
+! redraw_later(CLEAR);
+! cursor_on_force();
+! out_flush();
+! }
+!
+ SIGRETURN;
+ }
+ #endif
+***************
+*** 1331,1336 ****
+--- 1367,1374 ----
+ {
+ /* BeOS does have SIGTSTP, but it doesn't work. */
+ #if defined(SIGTSTP) && !defined(__BEOS__)
++ in_mch_suspend = TRUE;
++
+ out_flush(); /* needed to make cursor visible on some systems */
+ settmode(TMODE_COOK);
+ out_flush(); /* needed to disable mouse on some systems */
+***************
+*** 1338,1377 ****
+ # if defined(FEAT_CLIPBOARD) && defined(FEAT_X11)
+ loose_clipboard();
+ # endif
+!
+! # if defined(_REENTRANT) && defined(SIGCONT)
+ sigcont_received = FALSE;
+ # endif
+ kill(0, SIGTSTP); /* send ourselves a STOP signal */
+! # if defined(_REENTRANT) && defined(SIGCONT)
+ /*
+ * Wait for the SIGCONT signal to be handled. It generally happens
+! * immediately, but somehow not all the time. Do not call pause()
+! * because there would be race condition which would hang Vim if
+! * signal happened in between the test of sigcont_received and the
+! * call to pause(). If signal is not yet received, call sleep(0)
+! * to just yield CPU. Signal should then be received. If somehow
+! * it's still not received, sleep 1, 2, 3 ms. Don't bother waiting
+! * further if signal is not received after 1+2+3+4 ms (not expected
+! * to happen).
+ */
+ {
+ long wait_time;
+ for (wait_time = 0; !sigcont_received && wait_time <= 3L; wait_time++)
+- /* Loop is not entered most of the time */
+ mch_delay(wait_time, FALSE);
+ }
+ # endif
+
+! # ifdef FEAT_TITLE
+! /*
+! * Set oldtitle to NULL, so the current title is obtained again.
+! */
+! VIM_CLEAR(oldtitle);
+! # endif
+! settmode(TMODE_RAW);
+! need_check_timestamps = TRUE;
+! did_check_timestamps = FALSE;
+ #else
+ suspend_shell();
+ #endif
+--- 1376,1407 ----
+ # if defined(FEAT_CLIPBOARD) && defined(FEAT_X11)
+ loose_clipboard();
+ # endif
+! # if defined(SIGCONT)
+ sigcont_received = FALSE;
+ # endif
++
+ kill(0, SIGTSTP); /* send ourselves a STOP signal */
+!
+! # if defined(SIGCONT)
+ /*
+ * Wait for the SIGCONT signal to be handled. It generally happens
+! * immediately, but somehow not all the time, probably because it's handled
+! * in another thread. Do not call pause() because there would be race
+! * condition which would hang Vim if signal happened in between the test of
+! * sigcont_received and the call to pause(). If signal is not yet received,
+! * sleep 0, 1, 2, 3 ms. Don't bother waiting further if signal is not
+! * received after 1+2+3 ms (not expected to happen).
+ */
+ {
+ long wait_time;
++
+ for (wait_time = 0; !sigcont_received && wait_time <= 3L; wait_time++)
+ mch_delay(wait_time, FALSE);
+ }
+ # endif
++ in_mch_suspend = FALSE;
+
+! after_sigcont();
+ #else
+ suspend_shell();
+ #endif
+***************
+*** 1411,1417 ****
+ #ifdef SIGTSTP
+ signal(SIGTSTP, restricted ? SIG_IGN : SIG_DFL);
+ #endif
+! #if defined(_REENTRANT) && defined(SIGCONT)
+ signal(SIGCONT, sigcont_handler);
+ #endif
+
+--- 1441,1447 ----
+ #ifdef SIGTSTP
+ signal(SIGTSTP, restricted ? SIG_IGN : SIG_DFL);
+ #endif
+! #if defined(SIGCONT)
+ signal(SIGCONT, sigcont_handler);
+ #endif
+
+***************
+*** 1470,1476 ****
+ reset_signals(void)
+ {
+ catch_signals(SIG_DFL, SIG_DFL);
+! #if defined(_REENTRANT) && defined(SIGCONT)
+ /* SIGCONT isn't in the list, because its default action is ignore */
+ signal(SIGCONT, SIG_DFL);
+ #endif
+--- 1500,1506 ----
+ reset_signals(void)
+ {
+ catch_signals(SIG_DFL, SIG_DFL);
+! #if defined(SIGCONT)
+ /* SIGCONT isn't in the list, because its default action is ignore */
+ signal(SIGCONT, SIG_DFL);
+ #endif
+***************
+*** 1533,1539 ****
+ for (i = 0; signal_info[i].sig != -1; i++)
+ sigaddset(&newset, signal_info[i].sig);
+
+! # if defined(_REENTRANT) && defined(SIGCONT)
+ /* SIGCONT isn't in the list, because its default action is ignore */
+ sigaddset(&newset, SIGCONT);
+ # endif
+--- 1563,1569 ----
+ for (i = 0; signal_info[i].sig != -1; i++)
+ sigaddset(&newset, signal_info[i].sig);
+
+! # if defined(SIGCONT)
+ /* SIGCONT isn't in the list, because its default action is ignore */
+ sigaddset(&newset, SIGCONT);
+ # endif
+*** ../vim-8.1.0303/src/term.c 2018-08-20 21:58:53.505410802 +0200
+--- src/term.c 2018-08-21 12:55:46.236289405 +0200
+***************
+*** 3834,3849 ****
+ static int cursor_is_off = FALSE;
+
+ /*
+! * Enable the cursor.
+ */
+ void
+ cursor_on(void)
+ {
+ if (cursor_is_off)
+! {
+! out_str(T_VE);
+! cursor_is_off = FALSE;
+! }
+ }
+
+ /*
+--- 3834,3856 ----
+ static int cursor_is_off = FALSE;
+
+ /*
+! * Enable the cursor without checking if it's already enabled.
+! */
+! void
+! cursor_on_force(void)
+! {
+! out_str(T_VE);
+! cursor_is_off = FALSE;
+! }
+!
+! /*
+! * Enable the cursor if it's currently off.
+ */
+ void
+ cursor_on(void)
+ {
+ if (cursor_is_off)
+! cursor_on_force();
+ }
+
+ /*
+*** ../vim-8.1.0303/src/proto/term.pro 2018-08-20 21:58:53.509410779 +0200
+--- src/proto/term.pro 2018-08-21 12:55:54.468217234 +0200
+***************
+*** 52,57 ****
+--- 52,58 ----
+ int mouse_has(int c);
+ int mouse_model_popup(void);
+ void scroll_start(void);
++ void cursor_on_force(void);
+ void cursor_on(void);
+ void cursor_off(void);
+ void term_cursor_mode(int forced);
+*** ../vim-8.1.0303/src/version.c 2018-08-20 22:53:00.210105086 +0200
+--- src/version.c 2018-08-21 12:40:20.807634438 +0200
+***************
+*** 796,797 ****
+--- 796,799 ----
+ { /* Add new patch number below this line */
++ /**/
++ 304,
+ /**/
+
+--
+I used to wonder about the meaning of life. But I looked it
+up in the dictionary under "L" and there it was - the meaning
+of life. It was less than I expected. - Dogbert
+
+ /// Bram Moolenaar -- Bram@Moolenaar.net -- http://www.Moolenaar.net \\\
+/// sponsor Vim, vote for features -- http://www.Vim.org/sponsor/ \\\
+\\\ an exciting new programming language -- http://www.Zimbu.org ///
+ \\\ help me help AIDS victims -- http://ICCF-Holland.org ///
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