Remove timeouts from remote communication loop.

The select() now blocks until there's work to do instead of relying on a
small timeout value which can cause unproductive use of cpu cycles.

src/Flare.cc

@@ -0,0 +1,29 @@
+// See the file "COPYING" in the main distribution directory for copyright.
+
+#include "Flare.h"
+#include "util.h"
+#include <unistd.h>
+#include <fcntl.h>
+#include <errno.h>
+
+using namespace bro;
+
+Flare::Flare()
+	: pipe(FD_CLOEXEC, FD_CLOEXEC, O_NONBLOCK, O_NONBLOCK)
+	{
+	}
+
+void Flare::Fire()
+	{
+	char tmp;
+	safe_write(pipe.WriteFD(), &tmp, 1);
+	}
+
+void Flare::Extinguish()
+	{
+	char tmp[256];
+
+	for ( ; ; )
+		if ( read(pipe.ReadFD(), &tmp, sizeof(tmp)) == -1 && errno == EAGAIN )
+			break;
+	}