Index: src/mzscheme/include/scheme.h
===================================================================
--- src/mzscheme/include/scheme.h	(revision 8997)
+++ src/mzscheme/include/scheme.h	(working copy)
@@ -1066,6 +1066,10 @@
 
   Scheme_Object *name;
 
+  Scheme_Object *mbox_first;
+  Scheme_Object *mbox_last;
+  Scheme_Object *mbox_sema;
+
 #ifdef MZ_PRECISE_GC
   int gc_owner_set;
 #endif
Index: src/mzscheme/src/cstartup.inc
===================================================================
--- src/mzscheme/src/cstartup.inc	(revision 8997)
+++ src/mzscheme/src/cstartup.inc	(working copy)
@@ -1,24 +1,24 @@
   {
     static MZCOMPILED_STRING_FAR unsigned char expr[] = {35,126,9,51,46,57,57,46,48,46,49,56,50,0,0,0,1,0,0,6,0,
-9,0,14,0,17,0,24,0,31,0,35,0,42,0,47,0,60,0,65,0,69,
+9,0,14,0,17,0,22,0,35,0,39,0,46,0,50,0,55,0,62,0,69,
 0,78,0,84,0,98,0,112,0,115,0,119,0,121,0,132,0,134,0,148,0,
 155,0,177,0,179,0,193,0,253,0,23,1,32,1,41,1,51,1,68,1,107,
 1,146,1,215,1,4,2,92,2,137,2,142,2,162,2,53,3,73,3,124,3,
 190,3,75,4,233,4,20,5,31,5,110,5,0,0,131,7,0,0,65,98,101,
-103,105,110,29,11,11,64,99,111,110,100,62,111,114,66,108,101,116,114,101,99,
-66,117,110,108,101,115,115,63,108,101,116,66,100,101,102,105,110,101,64,119,104,
-101,110,72,112,97,114,97,109,101,116,101,114,105,122,101,64,108,101,116,42,63,
-97,110,100,68,104,101,114,101,45,115,116,120,65,113,117,111,116,101,29,94,2,
+103,105,110,29,11,11,64,99,111,110,100,62,111,114,64,119,104,101,110,72,112,
+97,114,97,109,101,116,101,114,105,122,101,63,108,101,116,66,100,101,102,105,110,
+101,63,97,110,100,64,108,101,116,42,66,108,101,116,114,101,99,66,117,110,108,
+101,115,115,68,104,101,114,101,45,115,116,120,65,113,117,111,116,101,29,94,2,
 14,68,35,37,107,101,114,110,101,108,11,29,94,2,14,68,35,37,112,97,114,
 97,109,122,11,62,105,102,63,115,116,120,61,115,70,108,101,116,45,118,97,108,
 117,101,115,61,120,73,108,101,116,114,101,99,45,118,97,108,117,101,115,66,108,
 97,109,98,100,97,1,20,112,97,114,97,109,101,116,101,114,105,122,97,116,105,
 111,110,45,107,101,121,61,118,73,100,101,102,105,110,101,45,118,97,108,117,101,
-115,98,10,34,11,8,191,184,94,159,2,16,34,34,159,2,15,34,34,16,20,
-2,3,2,2,2,5,2,2,2,6,2,2,2,7,2,2,2,8,2,2,2,
-9,2,2,2,4,2,2,2,10,2,2,2,11,2,2,2,12,2,2,97,35,
-11,8,191,184,93,159,2,15,34,35,16,2,2,13,161,2,2,35,2,13,2,
-2,2,13,97,10,11,11,8,191,184,16,0,97,10,36,11,8,191,184,16,0,
+115,98,10,34,11,8,176,180,94,159,2,16,34,34,159,2,15,34,34,16,20,
+2,3,2,2,2,4,2,2,2,5,2,2,2,6,2,2,2,7,2,2,2,
+8,2,2,2,9,2,2,2,10,2,2,2,11,2,2,2,12,2,2,97,35,
+11,8,176,180,93,159,2,15,34,35,16,2,2,13,161,2,2,35,2,13,2,
+2,2,13,97,10,11,11,8,176,180,16,0,97,10,36,11,8,176,180,16,0,
 13,16,4,34,29,11,11,2,2,11,18,98,64,104,101,114,101,8,31,8,30,
 8,29,8,28,8,27,27,248,22,180,3,23,196,1,249,22,173,3,80,158,37,
 34,251,22,73,2,17,248,22,88,23,200,2,12,249,22,63,2,1,248,22,90,
@@ -26,16 +26,16 @@
 73,2,17,248,22,88,23,200,2,249,22,63,2,1,248,22,90,23,202,1,12,
 27,248,22,65,248,22,180,3,23,197,1,28,248,22,71,23,194,2,20,15,159,
 35,34,35,28,248,22,71,248,22,65,23,195,2,248,22,64,193,249,22,173,3,
-80,158,37,34,251,22,73,2,17,248,22,64,23,200,2,249,22,63,2,12,248,
+80,158,37,34,251,22,73,2,17,248,22,64,23,200,2,249,22,63,2,9,248,
 22,65,23,202,1,11,18,100,10,8,31,8,30,8,29,8,28,8,27,16,4,
-11,11,2,18,3,1,7,101,110,118,55,51,48,52,16,4,11,11,2,19,3,
-1,7,101,110,118,55,51,48,53,27,248,22,65,248,22,180,3,23,197,1,28,
+11,11,2,18,3,1,7,101,110,118,55,48,53,50,16,4,11,11,2,19,3,
+1,7,101,110,118,55,48,53,51,27,248,22,65,248,22,180,3,23,197,1,28,
 248,22,71,23,194,2,20,15,159,35,34,35,28,248,22,71,248,22,65,23,195,
 2,248,22,64,193,249,22,173,3,80,158,37,34,250,22,73,2,20,248,22,73,
 249,22,73,248,22,73,2,21,248,22,64,23,202,2,251,22,73,2,17,2,21,
 2,21,249,22,63,2,4,248,22,65,23,205,1,18,100,11,8,31,8,30,8,
-29,8,28,8,27,16,4,11,11,2,18,3,1,7,101,110,118,55,51,48,55,
-16,4,11,11,2,19,3,1,7,101,110,118,55,51,48,56,248,22,180,3,193,
+29,8,28,8,27,16,4,11,11,2,18,3,1,7,101,110,118,55,48,53,53,
+16,4,11,11,2,19,3,1,7,101,110,118,55,48,53,54,248,22,180,3,193,
 27,248,22,180,3,194,249,22,63,248,22,73,248,22,64,196,248,22,65,195,27,
 248,22,65,248,22,180,3,23,197,1,249,22,173,3,80,158,37,34,28,248,22,
 51,248,22,174,3,248,22,64,23,198,2,27,249,22,2,32,0,89,162,8,44,
@@ -50,7 +50,7 @@
 22,64,201,248,22,65,198,27,248,22,65,248,22,180,3,196,27,248,22,180,3,
 248,22,64,195,249,22,173,3,80,158,38,34,28,248,22,71,195,250,22,74,2,
 20,9,248,22,65,199,250,22,73,2,7,248,22,73,248,22,64,199,250,22,74,
-2,11,248,22,65,201,248,22,65,202,27,248,22,65,248,22,180,3,23,197,1,
+2,10,248,22,65,201,248,22,65,202,27,248,22,65,248,22,180,3,23,197,1,
 27,249,22,1,22,77,249,22,2,22,180,3,248,22,180,3,248,22,64,199,249,
 22,173,3,80,158,38,34,251,22,73,1,22,119,105,116,104,45,99,111,110,116,
 105,110,117,97,116,105,111,110,45,109,97,114,107,2,24,250,22,74,1,23,101,
@@ -65,8 +65,8 @@
 65,202,251,22,73,2,17,28,249,22,140,8,248,22,174,3,248,22,64,23,201,
 2,64,101,108,115,101,10,248,22,64,23,198,2,250,22,74,2,20,9,248,22,
 65,23,201,1,249,22,63,2,3,248,22,65,23,203,1,99,8,31,8,30,8,
-29,8,28,8,27,16,4,11,11,2,18,3,1,7,101,110,118,55,51,51,48,
-16,4,11,11,2,19,3,1,7,101,110,118,55,51,51,49,18,158,94,10,64,
+29,8,28,8,27,16,4,11,11,2,18,3,1,7,101,110,118,55,48,55,56,
+16,4,11,11,2,19,3,1,7,101,110,118,55,48,55,57,18,158,94,10,64,
 118,111,105,100,8,47,27,248,22,65,248,22,180,3,196,249,22,173,3,80,158,
 37,34,28,248,22,51,248,22,174,3,248,22,64,197,250,22,73,2,26,248,22,
 73,248,22,64,199,248,22,88,198,27,248,22,174,3,248,22,64,197,250,22,73,
@@ -79,19 +79,19 @@
 10,2,3,2,4,2,5,2,6,2,7,2,8,2,9,2,10,2,11,2,12,
 34,44,35,11,11,16,0,16,0,16,0,34,34,11,11,11,16,0,16,0,16,
 0,34,34,16,11,16,5,93,2,13,20,15,159,34,34,34,34,20,102,159,34,
-16,0,16,1,33,32,10,16,5,93,2,6,89,162,8,44,35,51,9,223,0,
+16,0,16,1,33,32,10,16,5,93,2,12,89,162,8,44,35,51,9,223,0,
 33,33,34,20,102,159,34,16,1,20,25,159,35,2,2,2,13,16,0,11,16,
-5,93,2,9,89,162,8,44,35,51,9,223,0,33,34,34,20,102,159,34,16,
-1,20,25,159,35,2,2,2,13,16,0,11,16,5,93,2,12,89,162,8,44,
+5,93,2,5,89,162,8,44,35,51,9,223,0,33,34,34,20,102,159,34,16,
+1,20,25,159,35,2,2,2,13,16,0,11,16,5,93,2,9,89,162,8,44,
 35,51,9,223,0,33,35,34,20,102,159,34,16,1,20,25,159,35,2,2,2,
 13,16,1,33,36,11,16,5,93,2,4,89,162,8,44,35,54,9,223,0,33,
 37,34,20,102,159,34,16,1,20,25,159,35,2,2,2,13,16,1,33,38,11,
 16,5,93,2,7,89,162,8,44,35,56,9,223,0,33,41,34,20,102,159,34,
-16,1,20,25,159,35,2,2,2,13,16,0,11,16,5,93,2,5,89,162,8,
+16,1,20,25,159,35,2,2,2,13,16,0,11,16,5,93,2,11,89,162,8,
 44,35,51,9,223,0,33,43,34,20,102,159,34,16,1,20,25,159,35,2,2,
-2,13,16,0,11,16,5,93,2,11,89,162,8,44,35,52,9,223,0,33,44,
+2,13,16,0,11,16,5,93,2,10,89,162,8,44,35,52,9,223,0,33,44,
 34,20,102,159,34,16,1,20,25,159,35,2,2,2,13,16,0,11,16,5,93,
-2,10,89,162,8,44,35,53,9,223,0,33,45,34,20,102,159,34,16,1,20,
+2,6,89,162,8,44,35,53,9,223,0,33,45,34,20,102,159,34,16,1,20,
 25,159,35,2,2,2,13,16,0,11,16,5,93,2,3,89,162,8,44,35,56,
 9,223,0,33,46,34,20,102,159,34,16,1,20,25,159,35,2,2,2,13,16,
 1,33,48,11,16,5,93,2,8,89,162,8,44,35,52,9,223,0,33,49,34,
@@ -132,169 +132,169 @@
 103,32,111,114,32,98,121,116,101,32,115,116,114,105,110,103,6,36,36,99,97,
 110,110,111,116,32,97,100,100,32,97,32,115,117,102,102,105,120,32,116,111,32,
 97,32,114,111,111,116,32,112,97,116,104,58,32,5,0,27,20,14,159,80,158,
-35,49,250,80,158,38,50,249,22,27,11,80,158,40,49,22,142,12,10,248,22,
+35,49,250,80,158,38,50,249,22,27,11,80,158,40,49,22,146,12,10,248,22,
 188,4,23,196,2,28,248,22,166,5,23,194,2,12,87,94,248,22,143,8,23,
 194,1,248,80,159,36,53,35,195,28,248,22,71,23,195,2,9,27,248,22,64,
-23,196,2,27,28,248,22,187,12,23,195,2,23,194,1,28,248,22,186,12,23,
-195,2,249,22,188,12,23,196,1,250,80,158,41,47,248,22,138,13,2,20,11,
-10,250,80,158,39,47,248,22,138,13,2,20,23,197,1,10,28,23,193,2,249,
-22,63,248,22,190,12,249,22,188,12,23,198,1,247,22,139,13,27,248,22,65,
+23,196,2,27,28,248,22,191,12,23,195,2,23,194,1,28,248,22,190,12,23,
+195,2,249,22,128,13,23,196,1,250,80,158,41,47,248,22,142,13,2,20,11,
+10,250,80,158,39,47,248,22,142,13,2,20,23,197,1,10,28,23,193,2,249,
+22,63,248,22,130,13,249,22,128,13,23,198,1,247,22,143,13,27,248,22,65,
 23,200,1,28,248,22,71,23,194,2,9,27,248,22,64,23,195,2,27,28,248,
-22,187,12,23,195,2,23,194,1,28,248,22,186,12,23,195,2,249,22,188,12,
-23,196,1,250,80,158,46,47,248,22,138,13,2,20,11,10,250,80,158,44,47,
-248,22,138,13,2,20,23,197,1,10,28,23,193,2,249,22,63,248,22,190,12,
-249,22,188,12,23,198,1,247,22,139,13,248,80,159,44,52,35,248,22,65,23,
+22,191,12,23,195,2,23,194,1,28,248,22,190,12,23,195,2,249,22,128,13,
+23,196,1,250,80,158,46,47,248,22,142,13,2,20,11,10,250,80,158,44,47,
+248,22,142,13,2,20,23,197,1,10,28,23,193,2,249,22,63,248,22,130,13,
+249,22,128,13,23,198,1,247,22,143,13,248,80,159,44,52,35,248,22,65,23,
 199,1,87,94,23,193,1,248,80,159,42,52,35,248,22,65,23,197,1,87,94,
 23,193,1,27,248,22,65,23,198,1,28,248,22,71,23,194,2,9,27,248,22,
-64,23,195,2,27,28,248,22,187,12,23,195,2,23,194,1,28,248,22,186,12,
-23,195,2,249,22,188,12,23,196,1,250,80,158,44,47,248,22,138,13,2,20,
-11,10,250,80,158,42,47,248,22,138,13,2,20,23,197,1,10,28,23,193,2,
-249,22,63,248,22,190,12,249,22,188,12,23,198,1,247,22,139,13,248,80,159,
+64,23,195,2,27,28,248,22,191,12,23,195,2,23,194,1,28,248,22,190,12,
+23,195,2,249,22,128,13,23,196,1,250,80,158,44,47,248,22,142,13,2,20,
+11,10,250,80,158,42,47,248,22,142,13,2,20,23,197,1,10,28,23,193,2,
+249,22,63,248,22,130,13,249,22,128,13,23,198,1,247,22,143,13,248,80,159,
 42,52,35,248,22,65,23,199,1,248,80,159,40,52,35,248,22,65,196,249,80,
-159,36,37,35,2,7,195,27,248,22,163,12,23,195,2,28,23,193,2,192,87,
-94,23,193,1,28,248,22,135,6,23,195,2,27,248,22,185,12,195,28,192,192,
-248,22,186,12,195,11,87,94,28,28,248,22,164,12,23,195,2,10,27,248,22,
-163,12,23,196,2,28,23,193,2,192,87,94,23,193,1,28,248,22,135,6,23,
-196,2,27,248,22,185,12,23,197,2,28,23,193,2,192,87,94,23,193,1,248,
-22,186,12,23,197,2,11,12,250,22,170,8,76,110,111,114,109,97,108,45,112,
+159,36,37,35,2,7,195,27,248,22,167,12,23,195,2,28,23,193,2,192,87,
+94,23,193,1,28,248,22,135,6,23,195,2,27,248,22,189,12,195,28,192,192,
+248,22,190,12,195,11,87,94,28,28,248,22,168,12,23,195,2,10,27,248,22,
+167,12,23,196,2,28,23,193,2,192,87,94,23,193,1,28,248,22,135,6,23,
+196,2,27,248,22,189,12,23,197,2,28,23,193,2,192,87,94,23,193,1,248,
+22,190,12,23,197,2,11,12,250,22,170,8,76,110,111,114,109,97,108,45,112,
 97,116,104,45,99,97,115,101,6,42,42,112,97,116,104,32,40,102,111,114,32,
 97,110,121,32,115,121,115,116,101,109,41,32,111,114,32,118,97,108,105,100,45,
-112,97,116,104,32,115,116,114,105,110,103,23,197,2,28,28,248,22,164,12,23,
-195,2,249,22,140,8,248,22,165,12,23,197,2,2,21,249,22,140,8,247,22,
+112,97,116,104,32,115,116,114,105,110,103,23,197,2,28,28,248,22,168,12,23,
+195,2,249,22,140,8,248,22,169,12,23,197,2,2,21,249,22,140,8,247,22,
 154,7,2,21,27,28,248,22,135,6,23,196,2,23,195,2,248,22,144,7,248,
-22,168,12,23,197,2,28,249,22,151,13,0,21,35,114,120,34,94,91,92,92,
+22,172,12,23,197,2,28,249,22,155,13,0,21,35,114,120,34,94,91,92,92,
 93,91,92,92,93,91,63,93,91,92,92,93,34,23,195,2,28,248,22,135,6,
-195,248,22,171,12,195,194,27,248,22,174,6,23,195,1,249,22,172,12,248,22,
-147,7,250,22,157,13,0,6,35,114,120,34,47,34,28,249,22,151,13,0,22,
+195,248,22,175,12,195,194,27,248,22,174,6,23,195,1,249,22,176,12,248,22,
+147,7,250,22,161,13,0,6,35,114,120,34,47,34,28,249,22,155,13,0,22,
 35,114,120,34,91,47,92,92,93,91,46,32,93,43,91,47,92,92,93,42,36,
-34,23,201,2,23,199,1,250,22,157,13,0,19,35,114,120,34,91,32,46,93,
+34,23,201,2,23,199,1,250,22,161,13,0,19,35,114,120,34,91,32,46,93,
 43,40,91,47,92,92,93,42,41,36,34,23,202,1,6,2,2,92,49,80,158,
-42,35,2,21,28,248,22,135,6,194,248,22,171,12,194,193,87,94,28,27,248,
-22,163,12,23,196,2,28,23,193,2,192,87,94,23,193,1,28,248,22,135,6,
-23,196,2,27,248,22,185,12,23,197,2,28,23,193,2,192,87,94,23,193,1,
-248,22,186,12,23,197,2,11,12,250,22,170,8,23,196,2,2,22,23,197,2,
-28,248,22,185,12,23,195,2,12,248,22,187,10,249,22,132,10,248,22,164,6,
+42,35,2,21,28,248,22,135,6,194,248,22,175,12,194,193,87,94,28,27,248,
+22,167,12,23,196,2,28,23,193,2,192,87,94,23,193,1,28,248,22,135,6,
+23,196,2,27,248,22,189,12,23,197,2,28,23,193,2,192,87,94,23,193,1,
+248,22,190,12,23,197,2,11,12,250,22,170,8,23,196,2,2,22,23,197,2,
+28,248,22,189,12,23,195,2,12,248,22,187,10,249,22,132,10,248,22,164,6,
 250,22,183,6,2,23,23,200,1,23,201,1,247,22,23,87,94,28,27,248,22,
-163,12,23,196,2,28,23,193,2,192,87,94,23,193,1,28,248,22,135,6,23,
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 80,65,84,72,251,2,51,23,199,1,23,200,1,23,201,1,28,23,197,2,27,
 249,80,158,42,46,23,200,1,9,28,249,22,140,8,247,22,154,7,2,21,249,
-22,63,248,22,172,12,5,1,46,23,195,1,192,9,27,248,22,188,12,23,196,
-1,28,248,22,175,12,193,250,2,52,198,199,195,11,250,80,158,37,47,196,197,
+22,63,248,22,176,12,5,1,46,23,195,1,192,9,27,248,22,128,13,23,196,
+1,28,248,22,179,12,193,250,2,52,198,199,195,11,250,80,158,37,47,196,197,
 11,250,80,158,37,47,196,11,11,87,94,249,22,191,5,247,22,168,4,195,248,
 22,142,5,249,22,153,3,34,249,22,137,3,197,198,27,28,23,197,2,87,95,
-23,196,1,23,195,1,23,197,1,87,94,23,197,1,27,248,22,138,13,2,20,
+23,196,1,23,195,1,23,197,1,87,94,23,197,1,27,248,22,142,13,2,20,
 27,249,80,158,39,47,23,196,1,11,27,27,248,22,156,3,23,200,1,28,192,
 192,34,27,27,248,22,156,3,23,202,1,28,192,192,34,249,22,185,4,23,197,
 1,83,158,38,20,96,95,89,162,8,44,34,46,9,224,3,2,33,58,23,195,
@@ -330,7 +330,7 @@
 159,34,43,35,83,158,34,16,2,32,0,89,162,42,35,42,2,12,222,33,45,
 80,159,34,44,35,83,158,34,16,2,83,158,37,20,95,95,2,13,89,162,42,
 34,41,9,223,0,33,46,89,162,42,35,51,9,223,0,33,47,80,159,34,45,
-35,83,158,34,16,2,27,248,22,145,13,248,22,146,7,27,28,249,22,140,8,
+35,83,158,34,16,2,27,248,22,149,13,248,22,146,7,27,28,249,22,140,8,
 247,22,154,7,2,21,6,1,1,59,6,1,1,58,250,22,183,6,6,14,14,
 40,91,94,126,97,93,42,41,126,97,40,46,42,41,23,196,2,23,196,1,89,
 162,8,44,36,46,2,14,223,0,33,50,80,159,34,46,35,83,158,34,16,2,
@@ -347,7 +347,7 @@
 111,116,101,29,94,2,1,67,35,37,117,116,105,108,115,11,29,94,2,1,69,
 35,37,110,101,116,119,111,114,107,11,29,94,2,1,68,35,37,112,97,114,97,
 109,122,11,29,94,2,1,68,35,37,101,120,112,111,98,115,11,29,94,2,1,
-68,35,37,107,101,114,110,101,108,11,98,10,34,11,8,129,187,97,159,2,2,
+68,35,37,107,101,114,110,101,108,11,98,10,34,11,8,178,182,97,159,2,2,
 34,34,159,2,3,34,34,159,2,4,34,34,159,2,5,34,34,159,2,6,34,
 34,16,0,159,34,20,102,159,34,16,1,20,24,65,98,101,103,105,110,16,0,
 83,158,40,20,99,137,69,35,37,98,117,105,108,116,105,110,29,11,11,10,10,
@@ -382,29 +382,29 @@
 117,108,101,45,110,97,109,101,45,114,101,115,111,108,118,101,114,63,108,105,98,
 67,105,103,110,111,114,101,100,249,22,14,195,80,158,36,44,249,80,159,36,47,
 35,195,10,27,28,23,195,2,28,249,22,140,8,23,197,2,80,158,37,45,87,
-94,23,195,1,80,158,35,46,27,248,22,151,4,23,197,2,28,248,22,163,12,
-23,194,2,91,159,37,11,90,161,37,34,11,248,22,184,12,23,197,1,87,95,
+94,23,195,1,80,158,35,46,27,248,22,151,4,23,197,2,28,248,22,167,12,
+23,194,2,91,159,37,11,90,161,37,34,11,248,22,188,12,23,197,1,87,95,
 83,160,36,11,80,158,39,45,198,83,160,36,11,80,158,39,46,192,192,11,11,
-28,23,193,2,192,87,94,23,193,1,27,247,22,187,5,28,192,192,247,22,139,
+28,23,193,2,192,87,94,23,193,1,27,247,22,187,5,28,192,192,247,22,143,
 13,20,14,159,80,158,34,38,250,80,158,37,39,249,22,27,11,80,158,39,38,
-22,187,5,28,248,22,163,12,23,198,2,23,197,1,87,94,23,197,1,247,22,
-139,13,247,194,250,22,181,12,23,197,1,23,199,1,249,80,158,41,37,23,198,
-1,5,3,46,122,111,252,22,181,12,23,199,1,23,201,1,6,6,6,110,97,
+22,187,5,28,248,22,167,12,23,198,2,23,197,1,87,94,23,197,1,247,22,
+143,13,247,194,250,22,185,12,23,197,1,23,199,1,249,80,158,41,37,23,198,
+1,5,3,46,122,111,252,22,185,12,23,199,1,23,201,1,6,6,6,110,97,
 116,105,118,101,247,22,155,7,249,80,158,43,37,23,200,1,80,158,43,34,87,
-94,23,194,1,27,23,194,1,27,250,22,134,13,196,11,32,0,89,162,8,44,
+94,23,194,1,27,23,194,1,27,250,22,138,13,196,11,32,0,89,162,8,44,
 34,39,9,222,11,28,192,249,22,63,195,194,11,27,248,23,195,1,23,196,1,
-27,250,22,134,13,196,11,32,0,89,162,8,44,34,39,9,222,11,28,192,249,
-22,63,195,194,11,249,247,22,144,13,248,22,64,195,195,27,248,23,195,1,23,
-196,1,27,250,22,134,13,196,11,32,0,89,162,8,44,34,39,9,222,11,28,
+27,250,22,138,13,196,11,32,0,89,162,8,44,34,39,9,222,11,28,192,249,
+22,63,195,194,11,249,247,22,148,13,248,22,64,195,195,27,248,23,195,1,23,
+196,1,27,250,22,138,13,196,11,32,0,89,162,8,44,34,39,9,222,11,28,
 192,249,22,63,195,194,11,249,247,22,185,5,248,22,64,195,195,249,247,22,185,
 5,194,195,87,94,28,248,80,158,35,36,23,195,2,12,250,22,170,8,77,108,
 111,97,100,47,117,115,101,45,99,111,109,112,105,108,101,100,6,25,25,112,97,
 116,104,32,111,114,32,118,97,108,105,100,45,112,97,116,104,32,115,116,114,105,
-110,103,23,197,2,91,159,40,11,90,161,35,34,11,28,248,22,187,12,23,201,
-2,23,200,1,27,247,22,187,5,28,23,193,2,249,22,188,12,23,203,1,23,
-195,1,200,90,161,37,35,11,248,22,184,12,23,194,2,87,94,23,196,1,90,
+110,103,23,197,2,91,159,40,11,90,161,35,34,11,28,248,22,191,12,23,201,
+2,23,200,1,27,247,22,187,5,28,23,193,2,249,22,128,13,23,203,1,23,
+195,1,200,90,161,37,35,11,248,22,188,12,23,194,2,87,94,23,196,1,90,
 161,35,38,11,28,249,22,140,8,23,196,2,68,114,101,108,97,116,105,118,101,
-87,94,23,194,1,2,17,23,194,1,90,161,35,39,11,247,22,141,13,27,89,
+87,94,23,194,1,2,17,23,194,1,90,161,35,39,11,247,22,145,13,27,89,
 162,42,35,48,62,122,111,225,7,5,3,33,27,27,83,158,38,20,96,94,89,
 162,42,35,50,9,225,8,6,4,33,28,23,197,1,27,249,22,5,89,162,8,
 44,35,46,9,223,5,33,29,23,203,2,27,28,23,195,2,27,249,22,5,83,
@@ -418,11 +418,11 @@
 193,11,11,11,11,28,192,249,80,159,47,53,35,203,89,162,42,34,44,9,224,
 15,2,33,33,249,80,159,47,53,35,203,89,162,42,34,43,9,224,15,7,33,
 34,32,36,89,162,8,44,35,53,2,19,222,33,38,0,17,35,114,120,34,94,
-40,46,42,63,41,47,40,46,42,41,36,34,27,249,22,149,13,2,37,23,196,
+40,46,42,63,41,47,40,46,42,41,36,34,27,249,22,153,13,2,37,23,196,
 2,28,23,193,2,87,94,23,194,1,249,22,63,248,22,88,23,196,2,27,248,
-22,97,23,197,1,27,249,22,149,13,2,37,23,196,2,28,23,193,2,87,94,
+22,97,23,197,1,27,249,22,153,13,2,37,23,196,2,28,23,193,2,87,94,
 23,194,1,249,22,63,248,22,88,23,196,2,27,248,22,97,23,197,1,27,249,
-22,149,13,2,37,23,196,2,28,23,193,2,87,94,23,194,1,249,22,63,248,
+22,153,13,2,37,23,196,2,28,23,193,2,87,94,23,194,1,249,22,63,248,
 22,88,23,196,2,248,2,36,248,22,97,23,197,1,248,22,73,194,248,22,73,
 194,248,22,73,194,32,39,89,162,42,35,53,2,19,222,33,40,28,248,22,71,
 248,22,65,23,195,2,249,22,7,9,248,22,64,195,91,159,36,11,90,161,36,
@@ -436,8 +436,8 @@
 39,193,87,95,28,248,22,149,4,195,12,250,22,170,8,2,20,6,20,20,114,
 101,115,111,108,118,101,100,45,109,111,100,117,108,101,45,112,97,116,104,197,28,
 24,193,2,248,24,194,1,195,87,94,23,193,1,12,27,27,250,22,126,80,158,
-40,41,248,22,167,13,247,22,151,11,11,28,23,193,2,192,87,94,23,193,1,
-27,247,22,120,87,94,250,22,125,80,158,41,41,248,22,167,13,247,22,151,11,
+40,41,248,22,171,13,247,22,151,11,11,28,23,193,2,192,87,94,23,193,1,
+27,247,22,120,87,94,250,22,125,80,158,41,41,248,22,171,13,247,22,151,11,
 195,192,250,22,125,195,198,66,97,116,116,97,99,104,251,211,197,198,199,10,28,
 192,250,22,169,8,11,196,195,248,22,167,8,194,28,249,22,141,6,194,6,1,
 1,46,2,17,28,249,22,141,6,194,6,2,2,46,46,62,117,112,192,28,249,
@@ -447,8 +447,8 @@
 1,249,22,2,22,65,248,22,78,249,22,63,23,206,1,23,202,1,12,12,247,
 192,20,14,159,80,158,38,43,249,22,63,247,22,151,11,23,197,1,20,14,159,
 80,158,38,38,250,80,158,41,39,249,22,27,11,80,158,43,38,22,133,4,23,
-196,1,249,247,22,186,5,23,198,1,248,22,52,248,22,167,12,23,198,1,87,
-94,28,28,248,22,163,12,23,197,2,10,248,22,154,4,23,197,2,12,28,23,
+196,1,249,247,22,186,5,23,198,1,248,22,52,248,22,171,12,23,198,1,87,
+94,28,28,248,22,167,12,23,197,2,10,248,22,154,4,23,197,2,12,28,23,
 198,2,250,22,169,8,11,6,15,15,98,97,100,32,109,111,100,117,108,101,32,
 112,97,116,104,23,201,2,250,22,170,8,2,20,6,19,19,109,111,100,117,108,
 101,45,112,97,116,104,32,111,114,32,112,97,116,104,23,199,2,28,28,248,22,
@@ -462,50 +462,50 @@
 211,199,200,201,202,87,94,23,193,1,27,89,162,42,35,44,79,115,104,111,119,
 45,99,111,108,108,101,99,116,105,111,110,45,101,114,114,223,6,33,44,27,28,
 248,22,51,23,199,2,27,250,22,126,80,158,42,42,249,22,63,23,204,2,247,
-22,140,13,11,28,23,193,2,192,87,94,23,193,1,91,159,36,11,90,161,36,
+22,144,13,11,28,23,193,2,192,87,94,23,193,1,91,159,36,11,90,161,36,
 34,11,249,80,159,43,47,35,248,22,54,23,204,2,11,27,251,80,158,46,49,
 2,20,23,202,1,28,248,22,71,23,199,2,23,199,2,248,22,64,23,199,2,
-28,248,22,71,23,199,2,9,248,22,65,23,199,2,249,22,181,12,23,195,1,
+28,248,22,71,23,199,2,9,248,22,65,23,199,2,249,22,185,12,23,195,1,
 28,248,22,71,23,197,1,87,94,23,197,1,6,7,7,109,97,105,110,46,115,
 115,249,22,158,6,23,199,1,6,3,3,46,115,115,28,248,22,135,6,23,199,
 2,87,94,23,194,1,27,248,80,159,40,54,35,23,201,2,27,250,22,126,80,
 158,43,42,249,22,63,23,205,2,23,199,2,11,28,23,193,2,192,87,94,23,
 193,1,91,159,36,11,90,161,36,34,11,249,80,159,44,47,35,23,204,2,11,
-250,22,1,22,181,12,23,199,1,249,22,77,249,22,2,32,0,89,162,8,44,
-35,42,9,222,33,45,23,200,1,248,22,73,23,200,1,28,248,22,163,12,23,
-199,2,87,94,23,194,1,28,248,22,186,12,23,199,2,23,198,2,248,22,73,
+250,22,1,22,185,12,23,199,1,249,22,77,249,22,2,32,0,89,162,8,44,
+35,42,9,222,33,45,23,200,1,248,22,73,23,200,1,28,248,22,167,12,23,
+199,2,87,94,23,194,1,28,248,22,190,12,23,199,2,23,198,2,248,22,73,
 6,26,26,32,40,97,32,112,97,116,104,32,109,117,115,116,32,98,101,32,97,
 98,115,111,108,117,116,101,41,28,249,22,140,8,248,22,64,23,201,2,2,21,
-27,250,22,126,80,158,42,42,249,22,63,23,204,2,247,22,140,13,11,28,23,
+27,250,22,126,80,158,42,42,249,22,63,23,204,2,247,22,144,13,11,28,23,
 193,2,192,87,94,23,193,1,91,159,37,11,90,161,36,34,11,249,80,159,44,
 47,35,248,22,88,23,205,2,11,90,161,35,36,11,28,248,22,71,248,22,90,
-23,204,2,28,248,22,71,23,194,2,249,22,151,13,0,8,35,114,120,34,91,
+23,204,2,28,248,22,71,23,194,2,249,22,155,13,0,8,35,114,120,34,91,
 46,93,34,23,196,2,11,10,27,27,28,23,197,2,249,22,77,28,248,22,71,
 248,22,90,23,208,2,21,93,6,5,5,109,122,108,105,98,249,22,1,22,77,
 249,22,2,80,159,50,55,35,248,22,90,23,211,2,23,197,2,28,248,22,71,
 23,196,2,248,22,73,23,197,2,23,195,2,251,80,158,48,49,2,20,23,204,
-1,248,22,64,23,198,2,248,22,65,23,198,1,249,22,181,12,23,195,1,28,
+1,248,22,64,23,198,2,248,22,65,23,198,1,249,22,185,12,23,195,1,28,
 23,198,1,87,94,23,196,1,23,197,1,28,248,22,71,23,197,1,87,94,23,
-197,1,6,7,7,109,97,105,110,46,115,115,28,249,22,151,13,0,8,35,114,
+197,1,6,7,7,109,97,105,110,46,115,115,28,249,22,155,13,0,8,35,114,
 120,34,91,46,93,34,23,199,2,23,197,1,249,22,158,6,23,199,1,6,3,
 3,46,115,115,28,249,22,140,8,248,22,64,23,201,2,64,102,105,108,101,249,
-22,188,12,248,22,88,23,201,2,248,80,159,41,54,35,23,202,2,12,87,94,
-28,28,248,22,163,12,23,194,2,10,248,22,157,7,23,194,2,87,94,23,200,
+22,128,13,248,22,88,23,201,2,248,80,159,41,54,35,23,202,2,12,87,94,
+28,28,248,22,167,12,23,194,2,10,248,22,157,7,23,194,2,87,94,23,200,
 1,12,28,23,200,2,250,22,169,8,67,114,101,113,117,105,114,101,249,22,183,
 6,6,17,17,98,97,100,32,109,111,100,117,108,101,32,112,97,116,104,126,97,
 28,23,198,2,248,22,64,23,199,2,6,0,0,23,203,1,87,94,23,200,1,
 250,22,170,8,2,20,249,22,183,6,6,13,13,109,111,100,117,108,101,32,112,
 97,116,104,126,97,28,23,198,2,248,22,64,23,199,2,6,0,0,23,201,2,
-27,28,248,22,157,7,23,195,2,249,22,162,7,23,196,2,34,249,22,190,12,
-248,22,191,12,23,197,2,11,27,28,248,22,157,7,23,196,2,249,22,162,7,
+27,28,248,22,157,7,23,195,2,249,22,162,7,23,196,2,34,249,22,130,13,
+248,22,131,13,23,197,2,11,27,28,248,22,157,7,23,196,2,249,22,162,7,
 23,197,2,35,248,80,158,41,50,23,195,2,91,159,37,11,90,161,37,34,11,
 28,248,22,157,7,23,199,2,250,22,7,2,22,249,22,162,7,23,203,2,36,
-2,22,248,22,184,12,23,198,2,87,95,23,195,1,23,193,1,27,28,248,22,
+2,22,248,22,188,12,23,198,2,87,95,23,195,1,23,193,1,27,28,248,22,
 157,7,23,200,2,249,22,162,7,23,201,2,37,249,80,158,46,51,23,197,2,
 5,0,27,28,248,22,157,7,23,201,2,249,22,162,7,23,202,2,38,248,22,
-150,4,23,200,2,27,27,250,22,126,80,158,50,41,248,22,167,13,247,22,151,
+150,4,23,200,2,27,27,250,22,126,80,158,50,41,248,22,171,13,247,22,151,
 11,11,28,23,193,2,192,87,94,23,193,1,27,247,22,120,87,94,250,22,125,
-80,158,51,41,248,22,167,13,247,22,151,11,195,192,87,95,28,23,209,1,27,
+80,158,51,41,248,22,171,13,247,22,151,11,195,192,87,95,28,23,209,1,27,
 250,22,126,23,197,2,197,11,28,23,193,1,12,87,95,27,27,28,248,22,17,
 80,158,50,44,80,158,49,44,247,22,19,250,22,25,248,22,23,23,197,2,80,
 158,52,43,23,196,1,27,247,22,151,11,249,22,3,83,158,38,20,96,94,89,
@@ -516,12 +516,12 @@
 2,28,192,192,28,248,22,61,23,208,2,249,22,140,8,248,22,64,23,210,2,
 2,21,11,250,22,125,80,158,49,42,28,248,22,135,6,23,210,2,249,22,63,
 23,211,1,248,80,159,52,54,35,23,213,1,87,94,23,210,1,249,22,63,23,
-211,1,247,22,140,13,252,22,159,7,23,208,1,23,207,1,23,205,1,23,203,
+211,1,247,22,144,13,252,22,159,7,23,208,1,23,207,1,23,205,1,23,203,
 1,201,12,193,91,159,36,10,90,161,35,34,10,11,90,161,35,35,10,83,158,
 37,20,95,96,2,20,89,162,8,44,35,49,9,224,2,0,33,42,89,162,42,
 37,47,9,223,1,33,43,89,162,42,38,8,30,9,225,2,3,0,33,49,208,
 87,95,248,22,132,4,248,80,158,36,48,247,22,151,11,248,22,186,5,80,158,
-35,35,248,22,137,12,80,159,35,40,35,159,34,20,102,159,34,16,1,20,24,
+35,35,248,22,141,12,80,159,35,40,35,159,34,20,102,159,34,16,1,20,24,
 65,98,101,103,105,110,16,0,83,158,40,20,99,137,66,35,37,98,111,111,116,
 2,1,11,10,10,36,80,158,34,34,20,102,159,38,16,19,30,2,1,2,2,
 193,30,2,1,2,3,193,30,2,5,72,112,97,116,104,45,115,116,114,105,110,
Index: src/mzscheme/src/mzmark.c
===================================================================
--- src/mzscheme/src/mzmark.c	(revision 8997)
+++ src/mzscheme/src/mzmark.c	(working copy)
@@ -1678,6 +1678,9 @@
   gcMARK(pr->dead_box);
   gcMARK(pr->running_box);
 
+  gcMARK(pr->mbox_first);
+  gcMARK(pr->mbox_last);
+  gcMARK(pr->mbox_sema);
   return
   gcBYTES_TO_WORDS(sizeof(Scheme_Thread));
 }
@@ -1775,6 +1778,9 @@
   gcFIXUP(pr->dead_box);
   gcFIXUP(pr->running_box);
 
+  gcFIXUP(pr->mbox_first);
+  gcFIXUP(pr->mbox_last);
+  gcFIXUP(pr->mbox_sema);
   return
   gcBYTES_TO_WORDS(sizeof(Scheme_Thread));
 }
Index: src/mzscheme/src/thread.c
===================================================================
--- src/mzscheme/src/thread.c	(revision 8997)
+++ src/mzscheme/src/thread.c	(working copy)
@@ -2176,7 +2176,7 @@
   process->list_stack = NULL;
 
   scheme_gmp_tls_init(process->gmp_tls);
-
+  
   if (prefix) {
     process->next = scheme_first_thread;
     process->prev = NULL;
@@ -2244,6 +2244,21 @@
   
   process->nester = process->nestee = NULL;
 
+  process->mbox_first = NULL;
+  process->mbox_last = NULL;
+  process->mbox_sema = NULL;
+  /* this ensures the process has all members initialized before allocating
+     memory for the mbox semaphore (maybe unecessary) */
+  process->mref = NULL;
+  process->extra_mrefs = NULL;
+  {
+    Scheme_Object *sema = NULL;
+    sema = scheme_make_sema(0); 
+    process->mbox_sema = sema;
+  }
+
+    
+
   /* A thread points to a lot of stuff, so it's bad to put a finalization
      on it, which is what registering with a custodian does. Instead, we
      register a weak indirection with the custodian. That way, the thread
@@ -2586,6 +2601,10 @@
   r->error_buf = NULL;
 
   r->spare_runstack = NULL;
+
+  r->mbox_first = NULL;
+  r->mbox_last = NULL;
+  r->mbox_sema = NULL;
 }
 
 static void remove_thread(Scheme_Thread *r)
Index: src/mzscheme/src/mzmarksrc.c
===================================================================
--- src/mzscheme/src/mzmarksrc.c	(revision 8997)
+++ src/mzscheme/src/mzmarksrc.c	(working copy)
@@ -692,6 +692,9 @@
   gcMARK(pr->dead_box);
   gcMARK(pr->running_box);
 
+  gcMARK(pr->mbox_first);
+  gcMARK(pr->mbox_last);
+  gcMARK(pr->mbox_sema);
  size:
   gcBYTES_TO_WORDS(sizeof(Scheme_Thread));
 }
Index: src/mzscheme/src/sema.c
===================================================================
--- src/mzscheme/src/sema.c	(revision 8997)
+++ src/mzscheme/src/sema.c	(working copy)
@@ -38,6 +38,11 @@
 static Scheme_Object *make_channel_put(int n, Scheme_Object **p);
 static Scheme_Object *channel_p(int n, Scheme_Object **p);
 
+static Scheme_Object *thread_send(int n, Scheme_Object **p);
+static Scheme_Object *thread_receive(int n, Scheme_Object **p);
+static Scheme_Object *thread_try_receive(int n, Scheme_Object **p);
+static Scheme_Object *thread_receive_evt(int n, Scheme_Object **p);
+
 static Scheme_Object *make_alarm(int n, Scheme_Object **p);
 static Scheme_Object *make_sys_idle(int n, Scheme_Object **p);
 
@@ -136,6 +141,28 @@
 						      1, 1, 1), 
 			     env);  
 
+  scheme_add_global_constant("thread-send", 
+			     scheme_make_prim_w_arity(thread_send,
+						      "thread-send", 
+						      2, 2), 
+			     env);
+  scheme_add_global_constant("thread-receive", 
+			     scheme_make_prim_w_arity(thread_receive,
+						      "thread-receive", 
+						      0, 0), 
+			     env);
+  scheme_add_global_constant("thread-try-receive", 
+			     scheme_make_prim_w_arity(thread_try_receive,
+						      "thread-try-receive", 
+						      0, 0), 
+			     env);
+  scheme_add_global_constant("thread-receive-evt", 
+			     scheme_make_prim_w_arity(thread_receive_evt,
+						      "thread-receive-evt", 
+						      0, 0), 
+			     env);
+
+
   scheme_add_global_constant("alarm-evt", 
 			     scheme_make_prim_w_arity(make_alarm,
 						      "alarm-evt",
@@ -976,6 +1003,87 @@
 }
 
 /**********************************************************************/
+/*                           Thread mbox                              */
+/**********************************************************************/
+static void mbox_push( Scheme_Thread *p, Scheme_Object *o) {
+  /* check semaphore overflow before pushing */
+  if ((((Scheme_Sema *)p->mbox_sema)->value + 1) > ((Scheme_Sema *)p->mbox_sema)->value) {
+    Scheme_Object *next = NULL;
+    next = scheme_alloc_object();
+    next->type = scheme_raw_pair_type;
+    SCHEME_CAR(next) = o;
+    SCHEME_CDR(next) = NULL;
+
+    if (p->mbox_first) {
+      SCHEME_CDR(p->mbox_last) = next;
+      p->mbox_last = next;
+    } else {
+      p->mbox_first = next;
+      p->mbox_last = next;
+    }
+    
+    if (((Scheme_Sema*)p->mbox_sema)->value 
+        || (p == scheme_current_thread)) {
+      /* Avoid scheduler overhead when the semaphore is already up
+         or this is a self-send */
+      ++((Scheme_Sema*)p->mbox_sema)->value;
+    } else {
+      scheme_post_sema(p->mbox_sema);
+    }
+
+  } else scheme_raise_exn(MZEXN_FAIL, "thread-send: mailbox overflow");
+
+}
+
+static Scheme_Object *mbox_pop( Scheme_Thread *p, int dec ) {
+  /* assertion: mbox_first != NULL */
+  Scheme_Object *r = NULL;
+  r = SCHEME_CAR(p->mbox_first);
+  p->mbox_first = SCHEME_CDR(p->mbox_first);
+  if (!p->mbox_first)
+    p->mbox_last = NULL;
+  if (dec) (--((Scheme_Sema*)p->mbox_sema)->value);
+  return r;
+}
+
+static Scheme_Object *thread_send(int argc, Scheme_Object **argv) {
+  if (SCHEME_THREADP(argv[0])) {
+    int running;
+    running = ((Scheme_Thread*)argv[0])->running;
+    if (MZTHREAD_STILL_RUNNING(running)) {
+      mbox_push((Scheme_Thread*)argv[0], argv[1]);
+      return scheme_void;
+    } else scheme_raise_exn(MZEXN_FAIL, "thread-send: thread is not running");
+  } else scheme_wrong_type("thread-send", "thread", 0, argc, argv);
+  /* unreachable, but compiler complains */
+  return scheme_void;
+}
+
+/* The mbox semaphore can only be downed by the current thread, so
+   receive/try-receive can directly dec+pop without syncing 
+   (by calling mbox_pop with dec=1)
+*/
+static Scheme_Object *thread_receive(int argc, Scheme_Object **argv) {
+  if (scheme_current_thread->mbox_first) {
+    return mbox_pop(scheme_current_thread, 1);
+  } else {
+    scheme_wait_sema(scheme_current_thread->mbox_sema, 0);
+    return mbox_pop(scheme_current_thread, 0);
+  }
+}
+
+static Scheme_Object *thread_try_receive(int argc, Scheme_Object **argv) {
+  if (scheme_current_thread->mbox_first) {
+    return mbox_pop(scheme_current_thread, 1);
+  } else return scheme_false;
+}
+
+static Scheme_Object *thread_receive_evt(int argc, Scheme_Object **argv) {
+  return scheme_make_sema_repost( scheme_current_thread->mbox_sema );
+}
+
+
+/**********************************************************************/
 /*                             alarms                                 */
 /**********************************************************************/
 
Index: src/mzscheme/src/schminc.h
===================================================================
--- src/mzscheme/src/schminc.h	(revision 8997)
+++ src/mzscheme/src/schminc.h	(working copy)
@@ -13,7 +13,7 @@
 
 #define USE_COMPILED_STARTUP 1
 
-#define EXPECTED_PRIM_COUNT 899
+#define EXPECTED_PRIM_COUNT 903
 
 #ifdef MZSCHEME_SOMETHING_OMITTED
 # undef USE_COMPILED_STARTUP