From: Matt Birkholz <puck@birchwood-abbey.net>
Date: Fri, 5 Dec 2014 18:25:03 +0000 (-0700)
Subject: smp: share: ostty.o
X-Git-Url: https://birchwood-abbey.net/git?a=commitdiff_plain;h=d09ede3fd984ee45c3d579bd361a633c680c0fd0;p=mit-scheme.git

smp: share: ostty.o
---

diff --git a/README.txt b/README.txt
index 7a1cb9211..fdbb6438f 100644
--- a/README.txt
+++ b/README.txt
@@ -417,7 +417,15 @@ command line.  The remaining 12 belong to the 7 microcode modules and
   osscheme.o:
 
   ostty.o:
-  00000000 b next_interrupt_char
+  00000000 b next_interrupt_char	__thread
+
+	OK.  Now thread-local.  Set by signal handlers and used by
+	external-interrupt-handler.  The signal handlers may race, but
+	only if you keep banging on the keyboard.  (Don't do that. :0)
+	Assuming the handler runs with the INT_Character and INT_Timer
+	interrupts masked, the Scheme handler should stay on the
+	current processor and reliably read whatever the last signal
+	handler wrote.
 
   outf.o:
   00000000 b stderr_mutex
diff --git a/src/microcode/ostty.c b/src/microcode/ostty.c
index 2140df817..5b57f68ff 100644
--- a/src/microcode/ostty.c
+++ b/src/microcode/ostty.c
@@ -28,7 +28,7 @@ USA.
 #include "osscheme.h"
 #include "prims.h"
 
-static cc_t next_interrupt_char;
+static __thread cc_t next_interrupt_char;
 
 void
 tty_set_next_interrupt_char (cc_t c)