Attempt to name threads if possible.

On FreeBSD this means that for instance "top -H" will show the
varnish threads as "cache-foo" for various values of foo, hopefully
giving us another debugging hint.



git-svn-id: http://www.varnish-cache.org/svn/trunk/varnish-cache@2293 d4fa192b-c00b-0410-8231-f00ffab90ce4

bin/varnishd/cache.h

@@ -506,6 +506,9 @@ int HTC_Complete(struct http_conn *htc);
 #include "http_headers.h"
 #undef HTTPH
 
+/* cache_main.c */
+void THR_Name(const char *name);
+
 /* cache_pipe.c */
 void PipeSession(struct sess *sp);
 

bin/varnishd/cache_acceptor.c

@@ -154,6 +154,7 @@ vca_acct(void *arg)
 	unsigned u;
 	double now;
 
+	THR_Name("cache-acceptor");
 	(void)arg;
 
 	/* Set up the poll argument */

bin/varnishd/cache_acceptor_epoll.c

@@ -73,6 +73,7 @@ vca_main(void *arg)
 	struct sess *sp, *sp2;
 	int i;
 
+	THR_Name("cache-epoll");
 	(void)arg;
 
 	epfd = epoll_create(16);

bin/varnishd/cache_acceptor_kqueue.c

@@ -233,6 +233,7 @@ vca_kqueue_main(void *arg)
 	double deadline;
 	struct sess *sp;
 
+	THR_Name("cache-kqueue");
 	(void)arg;
 
 	kq = kqueue();

bin/varnishd/cache_acceptor_poll.c

@@ -112,6 +112,7 @@ vca_main(void *arg)
 	double deadline;
 	int i, fd;
 
+	THR_Name("cache-poll");
 	(void)arg;
 
 	vca_poll(vca_pipes[0]);

bin/varnishd/cache_expire.c

@@ -114,6 +114,7 @@ exp_hangman(void *arg)
 	struct object *o;
 	double t;
 
+	THR_Name("cache-hangman");
 	(void)arg;
 
 	t = TIM_real();
@@ -167,6 +168,7 @@ exp_prefetch(void *arg)
 	struct object *o2;
 	unsigned char log[1024];		/* XXX size ? */
 
+	THR_Name("cache-timeout");
 	(void)arg;
 
 	sp = SES_New(NULL, 0);

bin/varnishd/cache_main.c

@@ -39,6 +39,27 @@
 #include "heritage.h"
 #include "stevedore.h"
 
+/*--------------------------------------------------------------------
+ * Name threads if our pthreads implementation supports it.
+ */
+
+#ifdef HAVE_PTHREAD_NP_H
+#include <pthread_np.h>
+#endif
+
+void
+THR_Name(const char *name)
+{
+#ifdef HAVE_PTHREAD_SET_NAME_NP
+	pthread_set_name_np(pthread_self(), name);
+#else
+	/*
+	 * XXX: we could stash it somewhere else (TLS ?)
+	 */
+	(void)name;
+#endif
+}
+
 /*--------------------------------------------------------------------
  * XXX: Think more about which order we start things
  */
@@ -51,6 +72,8 @@ child_main(void)
 	setbuf(stderr, NULL);
 	printf("Child starts\n");
 
+	THR_Name("cache-main");
+
 #define SZOF(foo)	printf("sizeof(%s) = %zd\n", #foo, sizeof(foo));
 	SZOF(struct ws);
 	SZOF(struct http);

bin/varnishd/cache_pool.c

@@ -205,6 +205,7 @@ wrk_thread(void *priv)
 	char c;
 	unsigned char wlog[8192]; 	/* XXX: size */
 
+	THR_Name("cache-worker");
 	w = &ww;
 	qp = priv;
 	memset(w, 0, sizeof *w);