CRF: rename _start_write() to _initiate_write()

Tweaked the comments too.

Refs #445

uvloop/handles/stream.pxd

@@ -30,11 +30,12 @@ cdef class UVStream(UVBaseTransport):
     cdef inline __reading_started(self)
     cdef inline __reading_stopped(self)
 
-    # The user API firstly calls _buffer_write() to buffer up user data chunks,
-    # potentially multiple times in writelines(), and then call _start_write()
-    # to start writing either immediately or in the next iteration.
+    # The user API write() and writelines() firstly call _buffer_write() to
+    # buffer up user data chunks, potentially multiple times in writelines(),
+    # and then call _initiate_write() to start writing either immediately or in
+    # the next iteration (loop._queue_write()).
     cdef inline _buffer_write(self, object data)
-    cdef inline _start_write(self)
+    cdef inline _initiate_write(self)
 
     # _exec_write() is the method that does the actual send, and _try_write()
     # is a fast-path used in _exec_write() to send a single chunk.

uvloop/handles/stream.pyx

@@ -420,7 +420,7 @@ cdef class UVStream(UVBaseTransport):
         self._buffer_size += dlen
         self._buffer.append(data)
 
-    cdef inline _start_write(self):
+    cdef inline _initiate_write(self):
         if (not self._protocol_paused and
                 (<uv.uv_stream_t*>self._handle).write_queue_size == 0 and
                 self._buffer_size > self._high_water):
@@ -681,7 +681,7 @@ cdef class UVStream(UVBaseTransport):
             self._conn_lost += 1
             return
         self._buffer_write(buf)
-        self._start_write()
+        self._initiate_write()
 
     def writelines(self, bufs):
         self._ensure_alive()
@@ -693,7 +693,7 @@ cdef class UVStream(UVBaseTransport):
             return
         for buf in bufs:
             self._buffer_write(buf)
-        self._start_write()
+        self._initiate_write()
 
     def write_eof(self):
         self._ensure_alive()