Implement "struct waiter" for a waiter instance

bin/varnishd/cache/cache_session.c

@@ -60,7 +60,7 @@ struct sesspool {
 	struct mempool		*mpl_req;
 	struct mempool		*mpl_sess;
 
-	void			*http1_waiter;
+	struct waiter		*http1_waiter;
 };
 
 /*--------------------------------------------------------------------

bin/varnishd/waiter/cache_waiter.c

@@ -30,6 +30,7 @@
 
 #include "config.h"
 #include <stdio.h>
+#include <stdlib.h>
 #include <unistd.h>
 #include <string.h>
 #include <math.h>
@@ -38,6 +39,13 @@
 
 #include "waiter/waiter.h"
 
+struct waiter {
+	unsigned			magic;
+#define WAITER_MAGIC			0x17c399db
+	const struct waiter_impl	*impl;
+	void				*priv;
+};
+
 const char *
 WAIT_GetName(void)
 {
@@ -48,25 +56,32 @@ WAIT_GetName(void)
 		return ("no_waiter");
 }
 
-void *
+struct waiter *
 WAIT_Init(waiter_handle_f *func)
 {
+	struct waiter *w;
+
+	ALLOC_OBJ(w, WAITER_MAGIC);
+	AN(w);
 
 	AN(waiter);
 	AN(waiter->name);
 	AN(waiter->init);
 	AN(waiter->pass);
-	return (waiter->init(func));
+	w->impl = waiter;
+	w->priv = w->impl->init(func);
+	return (w);
 }
 
 int
-WAIT_Enter(void *waiter_priv, struct sess *sp)
+WAIT_Enter(const struct waiter *w, struct sess *sp)
 {
 
+	CHECK_OBJ_NOTNULL(w, WAITER_MAGIC);
 	CHECK_OBJ_NOTNULL(sp, SESS_MAGIC);
 	assert(sp->fd >= 0);
 
-	return (waiter->pass(waiter_priv, sp));
+	return (w->impl->pass(w->priv, sp));
 }
 
 /*

bin/varnishd/waiter/waiter.h

@@ -29,6 +29,7 @@
  */
 
 struct sess;
+struct waiter;
 
 enum wait_event {
 	WAITER_REMCLOSE,
@@ -49,8 +50,8 @@ struct waiter_impl {
 };
 
 /* cache_waiter.c */
-int WAIT_Enter(void *waiter_priv, struct sess *sp);
-void *WAIT_Init(waiter_handle_f *);
+int WAIT_Enter(const struct waiter *, struct sess *sp);
+struct waiter *WAIT_Init(waiter_handle_f *);
 const char *WAIT_GetName(void);
 int WAIT_Write_Session(struct sess *sp, int fd);