Add a diag_bitmap that causes worker threads to release their VCL

after each request, so we do not have to contort testcases around
the exact scheduling of worker threads.



git-svn-id: http://www.varnish-cache.org/svn/trunk/varnish-cache@5472 d4fa192b-c00b-0410-8231-f00ffab90ce4

bin/varnishd/cache_pool.c

@@ -190,6 +190,8 @@ wrk_thread_real(struct wq *qp, unsigned shm_workspace, unsigned sess_workspace,
 		AZ(w->wfd);
 		assert(w->wlp == w->wlb);
 		w->wrq = NULL;
+		if (params->diag_bitmap & 0x00040000)
+			VCL_Rel(&w->vcl);
 		if (!Lck_Trylock(&wstat_mtx)) {
 			wrk_sumstat(w);
 			Lck_Unlock(&wstat_mtx);

bin/varnishd/mgt_param.c

@@ -771,6 +771,7 @@ static const struct parspec input_parspec[] = {
 #endif
 		"  0x00010000 - synchronize shmlog.\n"
 		"  0x00020000 - synchronous start of persistence.\n"
+		"  0x00040000 - release VCL early.\n"
 		"  0x80000000 - do edge-detection on digest.\n"
 		"Use 0x notation and do the bitor in your head :-)\n",
 		0,

bin/varnishtest/tests/m00001.vtc

@@ -17,6 +17,8 @@ varnish v1 -arg "-pthread_pools=1" -vcl+backend {
 	}
 } -start
 
+varnish v1 -cliok "param.set diag_bitmap 0x40000"
+
 client c1 {
 	txreq -url "/bar"
 	rxresp
@@ -38,8 +40,6 @@ client c1 {
 	expect resp.http.bar == "fOo"
 } -run
 
-client c1 -run
-
 varnish v1 -cliok "debug.vmod"
 varnish v1 -cliok "vcl.list"
 
@@ -49,8 +49,6 @@ varnish v1 -cliok "vcl.discard vcl1"
 varnish v1 -cliok "vcl.list"
 varnish v1 -cliok "debug.vmod"
 
-client c1 -run
-
 varnish v1 -badvcl {
 	import std from "${topbuild}/lib/libvmod_std/.libs/libvmod_std.so.1" ;
 	import std from "${topbuild}/lib/libvmod_std/.libs/libvmod_std.so.1" ;