fix IO_WAIT on send for builtin TLS and MbedTLS

src/net.h

@@ -43,40 +43,41 @@ struct mg_mgr {
 };
 
 struct mg_connection {
-  struct mg_connection *next;  // Linkage in struct mg_mgr :: connections
-  struct mg_mgr *mgr;          // Our container
-  struct mg_addr loc;          // Local address
-  struct mg_addr rem;          // Remote address
-  void *fd;                    // Connected socket, or LWIP data
-  unsigned long id;            // Auto-incrementing unique connection ID
-  struct mg_iobuf recv;        // Incoming data
-  struct mg_iobuf send;        // Outgoing data
-  struct mg_iobuf prof;        // Profile data enabled by MG_ENABLE_PROFILE
-  struct mg_iobuf rtls;        // TLS only. Incoming encrypted data
-  mg_event_handler_t fn;       // User-specified event handler function
-  void *fn_data;               // User-specified function parameter
-  mg_event_handler_t pfn;      // Protocol-specific handler function
-  void *pfn_data;              // Protocol-specific function parameter
-  char data[MG_DATA_SIZE];     // Arbitrary connection data
-  void *tls;                   // TLS specific data
-  unsigned is_listening : 1;   // Listening connection
-  unsigned is_client : 1;      // Outbound (client) connection
-  unsigned is_accepted : 1;    // Accepted (server) connection
-  unsigned is_resolving : 1;   // Non-blocking DNS resolution is in progress
-  unsigned is_arplooking : 1;  // Non-blocking ARP resolution is in progress
-  unsigned is_connecting : 1;  // Non-blocking connect is in progress
-  unsigned is_tls : 1;         // TLS-enabled connection
-  unsigned is_tls_hs : 1;      // TLS handshake is in progress
-  unsigned is_udp : 1;         // UDP connection
-  unsigned is_websocket : 1;   // WebSocket connection
-  unsigned is_mqtt5 : 1;       // For MQTT connection, v5 indicator
-  unsigned is_hexdumping : 1;  // Hexdump in/out traffic
-  unsigned is_draining : 1;    // Send remaining data, then close and free
-  unsigned is_closing : 1;     // Close and free the connection immediately
-  unsigned is_full : 1;        // Stop reads, until cleared
-  unsigned is_resp : 1;        // Response is still being generated
-  unsigned is_readable : 1;    // Connection is ready to read
-  unsigned is_writable : 1;    // Connection is ready to write
+  struct mg_connection *next;     // Linkage in struct mg_mgr :: connections
+  struct mg_mgr *mgr;             // Our container
+  struct mg_addr loc;             // Local address
+  struct mg_addr rem;             // Remote address
+  void *fd;                       // Connected socket, or LWIP data
+  unsigned long id;               // Auto-incrementing unique connection ID
+  struct mg_iobuf recv;           // Incoming data
+  struct mg_iobuf send;           // Outgoing data
+  struct mg_iobuf prof;           // Profile data enabled by MG_ENABLE_PROFILE
+  struct mg_iobuf rtls;           // TLS only. Incoming encrypted data
+  mg_event_handler_t fn;          // User-specified event handler function
+  void *fn_data;                  // User-specified function parameter
+  mg_event_handler_t pfn;         // Protocol-specific handler function
+  void *pfn_data;                 // Protocol-specific function parameter
+  char data[MG_DATA_SIZE];        // Arbitrary connection data
+  void *tls;                      // TLS specific data
+  unsigned is_listening : 1;      // Listening connection
+  unsigned is_client : 1;         // Outbound (client) connection
+  unsigned is_accepted : 1;       // Accepted (server) connection
+  unsigned is_resolving : 1;      // Non-blocking DNS resolution is in progress
+  unsigned is_arplooking : 1;     // Non-blocking ARP resolution is in progress
+  unsigned is_connecting : 1;     // Non-blocking connect is in progress
+  unsigned is_tls : 1;            // TLS-enabled connection
+  unsigned is_tls_hs : 1;         // TLS handshake is in progress
+  unsigned is_udp : 1;            // UDP connection
+  unsigned is_websocket : 1;      // WebSocket connection
+  unsigned is_mqtt5 : 1;          // For MQTT connection, v5 indicator
+  unsigned is_hexdumping : 1;     // Hexdump in/out traffic
+  unsigned is_draining : 1;       // Send remaining data, then close and free
+  unsigned is_closing : 1;        // Close and free the connection immediately
+  unsigned is_full : 1;           // Stop reads, until cleared
+  unsigned is_tls_throttled : 1;  // Last TLS write: MG_SOCK_PENDING() was true
+  unsigned is_resp : 1;           // Response is still being generated
+  unsigned is_readable : 1;       // Connection is ready to read
+  unsigned is_writable : 1;       // Connection is ready to write
 };
 
 void mg_mgr_poll(struct mg_mgr *, int ms);