Fix compilation error.

Add new macro ASCS_ARBITRARY_SEND.

include/ascs/config.h

@@ -1093,6 +1093,11 @@ static_assert(ASCS_MSG_HANDLING_INTERVAL >= 0, "the interval of msg handling mus
 //during message sending, calling send_msg() will fail, this is by design to avoid asio::io_context using up all virtual memory, this also
 // means that before the sending really started, you can greedily call send_msg() and may exhaust all virtual memory, please note.
 
+//#define ASCS_ARBITRARY_SEND
+//dispatch an async do_send_msg invocation for each message, this feature brings 2 behaviors:
+// 1. it can also fix the situation i described for macro ASCS_EXPOSE_SEND_INTERFACE,
+// 2. it brings better effeciency for specific ENV, try to find them by you own.
+
 //#define ASCS_PASSIVE_RECV
 //to gain the ability of changing the unpacker at runtime, with this macro, ascs will not do message receiving automatically (except
 // the first one, if macro ASCS_SYNC_RECV been defined, the first one will be omitted too), so you need to manually call recv_msg(),

include/ascs/single_service_pump.h

@@ -32,7 +32,7 @@ public:
 		service_pump(concurrency_hint), Service((service_pump&) *this, std::forward<Arg>(arg)) {}
 #else
 	single_service_pump() : Service((service_pump&) *this) {}
-	template<typename Arg> single_service_pump() : Service((service_pump&) *this, std::forward<Arg>(arg)) {}
+	template<typename Arg> single_service_pump(Arg&& arg) : Service((service_pump&) *this, std::forward<Arg>(arg)) {}
 #endif
 };
 

include/ascs/socket.h

@@ -154,7 +154,11 @@ public:
 #ifndef ASCS_EXPOSE_SEND_INTERFACE
 private:
 #endif
+#ifdef ASCS_ARBITRARY_SEND
+	void send_msg() {dispatch_strand(rw_strand, [this]() {this->do_send_msg();});}
+#else
 	void send_msg() {if (!sending && is_ready()) dispatch_strand(rw_strand, [this]() {this->do_send_msg();});}
+#endif
 
 public:
 	void start_heartbeat(int interval, int max_absence = ASCS_HEARTBEAT_MAX_ABSENCE)

include/ascs/tcp/socket.h

@@ -382,7 +382,7 @@ private:
 #endif
 #ifdef ASCS_WANT_ALL_MSG_SEND_NOTIFY
 			if (send_buffer.empty())
-#if defined(ASCS_WANT_ALL_MSG_SEND_NOTIFY) || !defined(ASCS_WANT_BATCH_MSG_SEND_NOTIFY)
+#if defined(ASCS_WANT_MSG_SEND_NOTIFY) || !defined(ASCS_WANT_BATCH_MSG_SEND_NOTIFY)
 				this->on_all_msg_send(sending_msgs.back());
 #else
 			{
@@ -397,7 +397,9 @@ private:
 #endif
 #endif
 			sending_msgs.clear();
+#ifndef ASCS_ARBITRARY_SEND
 			if (!do_send_msg(true) && !send_buffer.empty()) //send msg in sequence
+#endif
 				do_send_msg(true); //just make sure no pending msgs
 		}
 		else