introduce io_eagain_read and io_eagain_write (discontinue using io_eagain plz)

CHANGES

@@ -14,6 +14,7 @@
   SECURITY: check for integer overflow in stralloc_ready
   switch io_fds from array to newly implemented (hopefully thread-safe) iarray
   switch epoll from level triggering to edge triggering
+  introduce io_eagain_read and io_eagain_write (discontinue using io_eagain plz)
 
 0.29:
   save 8 bytes in taia.h for 64-bit systems

io.h

@@ -64,8 +64,10 @@ int64 io_waituntil2(int64 milliseconds);
 void io_check();
 
 /* signal that read/accept/whatever returned EAGAIN */
-/* needed for SIGIO */
-void io_eagain(int64 d);
+/* needed for SIGIO and epoll */
+void io_eagain(int64 d);  /* do not use, API was a bad idea */
+void io_eagain_read(int64 d);	/* use these ones */
+void io_eagain_write(int64 d);
 
 /* return next descriptor from io_wait that can be read from */
 int64 io_canread();

io/io_eagain_read.c

@@ -0,0 +1,15 @@
+#include "io_internal.h"
+
+void io_eagain_read(int64 d) {
+  io_entry* e=iarray_get(&io_fds,d);
+  if (e) {
+    e->canread=0;
+#if defined(HAVE_SIGIO) || defined(HAVE_EPOLL)
+    if (d==alt_firstread) {
+      debug_printf(("io_eagain: dequeueing %lld from alt read queue (next is %ld)\n",d,e->next_read));
+      alt_firstread=e->next_read;
+    }
+#endif
+    e->next_read=-1;
+  }
+}

io/io_eagain_write.c

@@ -0,0 +1,15 @@
+#include "io_internal.h"
+
+void io_eagain_write(int64 d) {
+  io_entry* e=iarray_get(&io_fds,d);
+  if (e) {
+    e->canwrite=0;
+#if defined(HAVE_SIGIO) || defined(HAVE_EPOLL)
+    if (d==alt_firstwrite) {
+      debug_printf(("io_eagain: dequeueing %lld from alt write queue (next is %ld)\n",d,e->next_write));
+      alt_firstwrite=e->next_write;
+    }
+#endif
+    e->next_write=-1;
+  }
+}

io/iob_send.c

@@ -182,7 +182,7 @@ int64 iob_send(int64 s,io_batch* b) {
 	  sent=-3;
 	else {
 eagain:
-	  io_eagain(s);
+	  io_eagain_write(s);
 	  return -1;
 	}
       }
@@ -201,7 +201,7 @@ eagain:
 	sent=writev(s,v,headers);
       if (sent==-1) {
 	if (errno==EAGAIN) {
-	  io_eagain(s);
+	  io_eagain_write(s);
 	  return -1;
 	}
 	sent=-3;
@@ -237,7 +237,7 @@ eagain:
 	  goto abort;
 	}
       }
-      io_eagain(s);
+      io_eagain_write(s);
     } else break;
   }
 abort:

test/httpd.c

@@ -235,7 +235,7 @@ int main() {
 	  buffer_putnlflush(buffer_2);
 	}
 	if (errno==EAGAIN)
-	  io_eagain(s);
+	  io_eagain_read(s);
 	else
 	  carp("socket_accept6");
       } else {
@@ -285,7 +285,7 @@ emerge:
       struct http_data* h=io_getcookie(i);
       int64 r=iob_send(i,&h->iob);
 /*      printf("iob_send returned %lld\n",r); */
-      if (r==-1) io_eagain(i); else
+      if (r==-1) io_eagain_write(i); else
       if (r<=0) {
 	array_trunc(&h->r);
 	iob_reset(&h->iob);