use the event function to initialize the size of RE2 match data

src/vmod_re2.c

@@ -71,7 +71,6 @@ static char c;
 static const void *match_failed = (void *) &c;
 
 static size_t match_sz;
-static pthread_once_t sz_init_once = PTHREAD_ONCE_INIT;
 
 static void
 errmsg(VRT_CTX, const char *fmt, ...)
@@ -92,12 +91,6 @@ errmsg(VRT_CTX, const char *fmt, ...)
         va_end(args);
 }
 
-static void
-init_matchsz(void)
-{
-	match_sz = vre2_matchsz();
-}
-
 static void
 free_task_match(void *p)
 {
@@ -231,6 +224,19 @@ namedref(VRT_CTX, vre2 * restrict vre2, VCL_STRING name, VCL_STRING fallback,
 
 #undef ERR_PREFIX
 
+/* Event function */
+
+int
+event(VRT_CTX, struct vmod_priv *priv, enum vcl_event_e e)
+{
+	(void) ctx;
+	(void) priv;
+
+	if (e == VCL_EVENT_LOAD)
+		match_sz = vre2_matchsz();
+	return 0;
+}
+
 VCL_VOID
 vmod_regex__init(const struct vrt_ctx *ctx, struct vmod_re2_regex **rep,
 		 const char *vcl_name, VCL_STRING pattern, VCL_BOOL utf8,
@@ -271,7 +277,6 @@ vmod_regex__init(const struct vrt_ctx *ctx, struct vmod_re2_regex **rep,
 	}
 	re->never_capture = never_capture;
 	re->vcl_name = strdup(vcl_name);
-	AZ(pthread_once(&sz_init_once, init_matchsz));
 }
 
 VCL_VOID

src/vmod_re2.vcc

@@ -9,6 +9,8 @@
 
 $Module re2 3 access the Google RE2 regular expression engine
 
+$Event event
+
 $Object regex(STRING pattern, BOOL utf8=0, BOOL posix_syntax=0,
               BOOL longest_match=0, INT max_mem=8388608, BOOL literal=0,
 	      BOOL never_nl=0, BOOL dot_nl=0, BOOL never_capture=0,