single-tasking callback i/o works

Makefile

@@ -1,5 +1,5 @@
 CC = gcc34
-CFLAGS = -Os -march=pentium4 -Wall -Wno-long-long
+CFLAGS = -Os -march=pentium4 -Wall -Wno-long-long -fomit-frame-pointer
 LIBS = -lm
 STRIP = strip
 

TODO.FACTOR.txt

@@ -1,8 +1,8 @@
 0.62:
 
-- read-line: handle \r\n
-- ignore errors from flush
-- can-read-line?
+- gc call in the middle of some ops might affect callstack
+- sending ^C on socket
+- postpone errors until actual read/write op
 - vector-each/map examples
 - unparse examples
 - finish second practical
@@ -83,7 +83,7 @@
 
 + httpd:
 
-- httpd: don't flush so much
+- if user clicks stop in browser, doesn't stop sending?
 - log with date
 - log user agent
 - add a socket timeout

library/platform/native/io-internals.factor

@@ -38,7 +38,9 @@ USE: strings
 : stderr 2 getenv ;
 
 : flush-fd ( port -- )
-    [ swap add-write-io-task next-io-task drop ( call ) ] callcc0 ;
+    [
+        swap add-write-io-task next-io-task call
+    ] callcc0 drop ;
 
 : wait-to-write ( len port -- )
     tuck can-write? [ drop ] [ flush-fd ] ifte ;
@@ -49,7 +51,9 @@ USE: strings
     over wait-to-write write-fd-8 ;
 
 : fill-fd ( port -- )
-    [ swap add-read-line-io-task next-io-task drop ( call ) ] callcc0 ;
+    [
+        swap add-read-line-io-task next-io-task call
+    ] callcc0 drop ;
 
 : wait-to-read-line ( port -- )
     dup can-read-line? [ drop ] [ fill-fd ] ifte ;
@@ -58,8 +62,9 @@ USE: strings
     dup wait-to-read-line read-line-fd-8 dup [ sbuf>str ] when ;
 
 : wait-to-accept ( socket -- )
-    [ swap add-accept-io-task next-io-task drop ( call ) ] callcc0 ;
+    [
+        swap add-accept-io-task next-io-task call
+    ] callcc0 drop ;
 
 : blocking-accept ( socket -- host port in out )
     dup wait-to-accept accept-fd ;
-

native/fd.c

@@ -8,7 +8,13 @@ void init_io(void)
 
 bool can_read_line(PORT* port)
 {
-	return false;
+	if(port->line_ready)
+		return true;
+	else
+	{
+		read_line_step(port);
+		return port->line_ready;
+	}
 }
 
 void primitive_can_read_line(void)
@@ -43,32 +49,61 @@ bool read_line_step(PORT* port)
 	int i;
 	char ch;
 
-	SBUF* line = untag_sbuf(port->line);
+	SBUF* line;
+
+	if(port->line == F)
+	{
+		line = sbuf(LINE_SIZE);
+		port->line = tag_object(line);
+	}
+	else
+	{
+		line = untag_sbuf(port->line);
+		line->top = 0;
+	}
 
 	for(i = port->buf_pos; i < port->buf_fill; i++)
 	{
 		ch = bget((CELL)port->buffer + sizeof(STRING) + i);
+
+		if(ch == '\r')
+		{
+			if(i != port->buf_fill - 1)
+			{
+				ch = bget((CELL)port->buffer
+					+ sizeof(STRING) + i + 1);
+				if(ch == '\n')
+					i++;
+			}
+		}
+
 		if(ch == '\n')
 		{
 			port->buf_pos = i + 1;
+			port->line_ready = true;
 			return true;
 		}
 		else
 			set_sbuf_nth(line,line->top,ch);
 	}
 
-	port->buf_pos = port->buf_fill;
-
 	/* We've reached the end of the above loop, without seeing a newline
 	or EOF, so read again */
+	port->line_ready = false;
 	return false;
 }
 
 void primitive_read_line_fd_8(void)
 {
 	PORT* port = untag_port(dpeek());
-	drepl(port->line);
-	port->line = F;
+	if(port->line_ready)
+	{
+		drepl(port->line);
+		port->line = F;
+		port->line_ready = false;
+	}
+	else
+		io_error(port,__FUNCTION__);
 
 }
 

native/iomux.c

@@ -111,11 +111,6 @@ bool set_up_fd_set(fd_set* fdset, int fd_count, IO_TASK* io_tasks)
 
 bool perform_read_line_io_task(PORT* port)
 {
-	if(port->line == F)
-		port->line = tag_object(sbuf(LINE_SIZE));
-	else
-		untag_sbuf(port->line)->top = 0;
-
 	if(port->buf_pos >= port->buf_fill)
 	{
 		if(!read_step(port))
@@ -126,6 +121,7 @@ bool perform_read_line_io_task(PORT* port)
 	{
 		/* EOF */
 		port->line = F;
+		port->line_ready = true;
 		return true;
 	}
 	else

native/memory.c

@@ -24,7 +24,7 @@ ZONE* zalloc(CELL size)
 	ZONE* z = (ZONE*)malloc(sizeof(ZONE));
 	if(z == 0)
 		fatal_error("Cannot allocate zone header",size);
-	z->base = z->here = (CELL)malloc(size);
+	z->base = z->here = align8((CELL)malloc(size));
 	if(z->base == 0)
 		fatal_error("Cannot allocate zone",size);
 	z->limit = z->base + size;
@@ -40,28 +40,23 @@ void init_arena(CELL size)
 	active = z1;
 }
 
-void* allot(CELL a)
+void check_memory(void)
 {
-	CELL h = active->here;
-	active->here = align8(active->here + a);
+	if(active->here > active->alarm)
+	{
+		if(active->here > active->limit)
+		{
+			printf("Out of memory\n");
+			printf("active->base  = %ld\n",active->base);
+			printf("active->here  = %ld\n",active->here);
+			printf("active->limit = %ld\n",active->limit);
+			exit(1);
+		}
 
-	if(active->here > active->limit)
-	{
-		printf("Out of memory\n");
-		printf("active->base  = %ld\n",active->base);
-		printf("active->here  = %ld\n",active->here);
-		printf("active->limit = %ld\n",active->limit);
-		printf("request       = %ld\n",a);
-		exit(1);
-	}
-	else if(active->here > active->alarm)
-	{
 		/* Execute the 'garbage-collection' word */
 		cpush(env.cf);
 		env.cf = env.user[GC_ENV];
 	}
-
-	return (void*)h;
 }
 
 void flip_zones()

native/memory.h

@@ -15,13 +15,21 @@ ZONE* zalloc(CELL size);
 void init_arena(CELL size);
 void flip_zones();
 
-void* allot(CELL a);
+void check_memory(void);
 
 INLINE CELL align8(CELL a)
 {
 	return ((a & 7) == 0) ? a : ((a + 8) & ~7);
 }
 
+INLINE void* allot(CELL a)
+{
+	CELL h = active->here;
+	active->here += align8(a);
+	check_memory();
+	return (void*)h;
+}
+
 INLINE CELL get(CELL where)
 {
 	return *((CELL*)where);

native/port.c

@@ -22,6 +22,7 @@ PORT* port(PORT_MODE type, CELL fd)
 	port->client_port = F;
 	port->client_socket = F;
 	port->line = F;
+	port->line_ready = false;
 	port->buf_fill = 0;
 	port->buf_pos = 0;
 

native/port.h

@@ -8,6 +8,8 @@ typedef struct {
 	STRING* buffer;
 	/* tagged partial line used by read_line_fd */
 	CELL line;
+	/* is it ready to be returned? */
+	bool line_ready;
 	/* tagged client info used by accept_fd */
 	CELL client_host;
 	CELL client_port;