Respect PTHREAD_STACK_MIN for workerthread stack size.

git-svn-id: http://www.varnish-cache.org/svn/trunk/varnish-cache@4583 d4fa192b-c00b-0410-8231-f00ffab90ce4

bin/varnishd/mgt_pool.c

@@ -191,10 +191,11 @@ const struct parspec WRK_parspec[] = {
 		EXPERIMENTAL,
 		"3", "requests per request" },
 	{ "thread_pool_stack",
-		tweak_uint, &master.wthread_stacksize, 64*1024, UINT_MAX,
-		"Worker thread stack size.  In particular on 32bit systems "
-		"you may need to tweak this down to fit many threads into "
-		"the limited address space.\n",
+		tweak_uint, &master.wthread_stacksize,
+		PTHREAD_STACK_MIN, UINT_MAX,
+		"Worker thread stack size.\n"
+		"On 32bit systems you may need to tweak this down to fit "
+		"many threads into the limited address space.\n",
 		EXPERIMENTAL,
 		"-1", "bytes" },
 	{ NULL, NULL, NULL }

bin/varnishd/varnishd.c

@@ -587,7 +587,11 @@ main(int argc, char * const *argv)
 		 */
 		MCF_ParamSet(cli, "sess_workspace", "16384");
 		cli_check(cli);
-		MCF_ParamSet(cli, "thread_pool_stack", "65536");
+
+		/* Set the stacksize to min(PTHREAD_STACK_MIN, 64k) */
+		bprintf(dirname, "%d",
+		    PTHREAD_STACK_MIN > 65536 ? PTHREAD_STACK_MIN : 65536);
+		MCF_ParamSet(cli, "thread_pool_stack", dirname);
 		cli_check(cli);
 	}