main-loop: Drop qemu_set_fd_handler2

All users are converted to qemu_set_fd_handler now, drop
qemu_set_fd_handler2 and IOHandlerRecord.fd_read_poll.

Signed-off-by: Fam Zheng <famz@redhat.com>
Message-id: 1433400324-7358-9-git-send-email-famz@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

include/block/aio.h

@@ -241,7 +241,7 @@ bool aio_dispatch(AioContext *ctx);
 bool aio_poll(AioContext *ctx, bool blocking);
 
 /* Register a file descriptor and associated callbacks.  Behaves very similarly
- * to qemu_set_fd_handler2.  Unlike qemu_set_fd_handler2, these callbacks will
+ * to qemu_set_fd_handler.  Unlike qemu_set_fd_handler, these callbacks will
  * be invoked when using aio_poll().
  *
  * Code that invokes AIO completion functions should rely on this function

include/qemu/main-loop.h

@@ -96,8 +96,7 @@ AioContext *qemu_get_aio_context(void);
  * that the main loop waits for.
  *
  * Calling qemu_notify_event is rarely necessary, because main loop
- * services (bottom halves and timers) call it themselves.  One notable
- * exception occurs when using qemu_set_fd_handler2 (see below).
+ * services (bottom halves and timers) call it themselves.
  */
 void qemu_notify_event(void);
 
@@ -171,52 +170,6 @@ void qemu_del_wait_object(HANDLE handle, WaitObjectFunc *func, void *opaque);
 typedef void IOReadHandler(void *opaque, const uint8_t *buf, int size);
 typedef int IOCanReadHandler(void *opaque);
 
-/**
- * qemu_set_fd_handler2: Register a file descriptor with the main loop
- *
- * This function tells the main loop to wake up whenever one of the
- * following conditions is true:
- *
- * 1) if @fd_write is not %NULL, when the file descriptor is writable;
- *
- * 2) if @fd_read is not %NULL, when the file descriptor is readable.
- *
- * @fd_read_poll can be used to disable the @fd_read callback temporarily.
- * This is useful to avoid calling qemu_set_fd_handler2 every time the
- * client becomes interested in reading (or dually, stops being interested).
- * A typical example is when @fd is a listening socket and you want to bound
- * the number of active clients.  Remember to call qemu_notify_event whenever
- * the condition may change from %false to %true.
- *
- * The callbacks that are set up by qemu_set_fd_handler2 are level-triggered.
- * If @fd_read does not read from @fd, or @fd_write does not write to @fd
- * until its buffers are full, they will be called again on the next
- * iteration.
- *
- * @fd: The file descriptor to be observed.  Under Windows it must be
- * a #SOCKET.
- *
- * @fd_read_poll: A function that returns 1 if the @fd_read callback
- * should be fired.  If the function returns 0, the main loop will not
- * end its iteration even if @fd becomes readable.
- *
- * @fd_read: A level-triggered callback that is fired if @fd is readable
- * at the beginning of a main loop iteration, or if it becomes readable
- * during one.
- *
- * @fd_write: A level-triggered callback that is fired when @fd is writable
- * at the beginning of a main loop iteration, or if it becomes writable
- * during one.
- *
- * @opaque: A pointer-sized value that is passed to @fd_read_poll,
- * @fd_read and @fd_write.
- */
-int qemu_set_fd_handler2(int fd,
-                         IOCanReadHandler *fd_read_poll,
-                         IOHandler *fd_read,
-                         IOHandler *fd_write,
-                         void *opaque);
-
 /**
  * qemu_set_fd_handler: Register a file descriptor with the main loop
  *

iohandler.c

@@ -33,7 +33,6 @@
 #endif
 
 typedef struct IOHandlerRecord {
-    IOCanReadHandler *fd_read_poll;
     IOHandler *fd_read;
     IOHandler *fd_write;
     void *opaque;
@@ -46,11 +45,7 @@ typedef struct IOHandlerRecord {
 static QLIST_HEAD(, IOHandlerRecord) io_handlers =
     QLIST_HEAD_INITIALIZER(io_handlers);
 
-
-/* XXX: fd_read_poll should be suppressed, but an API change is
-   necessary in the character devices to suppress fd_can_read(). */
-int qemu_set_fd_handler2(int fd,
-                         IOCanReadHandler *fd_read_poll,
+int qemu_set_fd_handler(int fd,
                         IOHandler *fd_read,
                         IOHandler *fd_write,
                         void *opaque)
@@ -75,7 +70,6 @@ int qemu_set_fd_handler2(int fd,
         QLIST_INSERT_HEAD(&io_handlers, ioh, next);
     found:
         ioh->fd = fd;
-        ioh->fd_read_poll = fd_read_poll;
         ioh->fd_read = fd_read;
         ioh->fd_write = fd_write;
         ioh->opaque = opaque;
@@ -86,14 +80,6 @@ int qemu_set_fd_handler2(int fd,
     return 0;
 }
 
-int qemu_set_fd_handler(int fd,
-                        IOHandler *fd_read,
-                        IOHandler *fd_write,
-                        void *opaque)
-{
-    return qemu_set_fd_handler2(fd, NULL, fd_read, fd_write, opaque);
-}
-
 void qemu_iohandler_fill(GArray *pollfds)
 {
     IOHandlerRecord *ioh;
@@ -103,9 +89,7 @@ void qemu_iohandler_fill(GArray *pollfds)
 
         if (ioh->deleted)
             continue;
-        if (ioh->fd_read &&
-            (!ioh->fd_read_poll ||
-             ioh->fd_read_poll(ioh->opaque) != 0)) {
+        if (ioh->fd_read) {
             events |= G_IO_IN | G_IO_HUP | G_IO_ERR;
         }
         if (ioh->fd_write) {

stubs/set-fd-handler.c

@@ -8,12 +8,3 @@ int qemu_set_fd_handler(int fd,
 {
     abort();
 }
-
-int qemu_set_fd_handler2(int fd,
-                         IOCanReadHandler *fd_read_poll,
-                         IOHandler *fd_read,
-                         IOHandler *fd_write,
-                         void *opaque)
-{
-    abort();
-}