David Zeuthen 8a3a4596e2 Bug 626748 – Use async methods for writing and handle EAGAIN ... If sending a lot of data and/or the other peer is not reading it, then socket buffers can overflow. This is communicated from the kernel by returning EAGAIN. In GIO, it is modelled by g_output_stream_write() and g_socket_send_message() returning G_IO_ERROR_WOULD_BLOCK. It is also problematic that that we're using synchronous IO in the shared GDBus IO thread. It means that one GDBusConnection can lock up others. It turns out that by porting from g_output_stream_write() to g_output_stream_write_async() we fix the EAGAIN issue. For GSocket, we still need to handle things manually (by creating a GSource) as g_socket_send_message() is used. We check the new behavior in Michael's producer/consumer test case (at /gdbus/overflow in gdbus-peer.c) added in the last commit. Also add a test case that sends and receives a 20 MiB message. Also add a new `transport' G_DBUS_DEBUG option so it is easy to inspect partial writes: $ G_DBUS_DEBUG=transport ./gdbus-connection -p /gdbus/connection/large_message [...] ======================================================================== GDBus-debug:Transport: >>>> WROTE 128000 bytes of message with serial 4 and size 20971669 from offset 0 on a GSocketOutputStream ======================================================================== GDBus-debug:Transport: >>>> WROTE 128000 bytes of message with serial 4 and size 20971669 from offset 128000 on a GSocketOutputStream ======================================================================== GDBus-debug:Transport: >>>> WROTE 128000 bytes of message with serial 4 and size 20971669 from offset 256000 on a GSocketOutputStream [...] ======================================================================== GDBus-debug:Transport: >>>> WROTE 43669 bytes of message with serial 4 and size 20971669 from offset 20928000 on a GSocketOutputStream [...] ======================================================================== GDBus-debug:Transport: <<<< READ 16 bytes of message with serial 3 and size 20971620 to offset 0 from a GSocketInputStream ======================================================================== GDBus-debug:Transport: <<<< READ 15984 bytes of message with serial 3 and size 20971620 to offset 16 from a GSocketInputStream ======================================================================== GDBus-debug:Transport: <<<< READ 16000 bytes of message with serial 3 and size 20971620 to offset 16000 from a GSocketInputStream [...] ======================================================================== GDBus-debug:Transport: <<<< READ 144000 bytes of message with serial 3 and size 20971620 to offset 20720000 from a GSocketInputStream ======================================================================== GDBus-debug:Transport: <<<< READ 107620 bytes of message with serial 3 and size 20971620 to offset 20864000 from a GSocketInputStream OK https://bugzilla.gnome.org/show_bug.cgi?id=626748 Signed-off-by: David Zeuthen <davidz@redhat.com>		2010-08-16 13:54:13 -04:00
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reference	Bug 626748 – Use async methods for writing and handle EAGAIN	2010-08-16 13:54:13 -04:00
debugging.txt	Remove references to gruntime. This includes renaming the test program	2002-02-26 21:23:52 +00:00
macros.txt	honour g_mem_gc_friendly settings when freeing slices, make sure	2006-01-25 15:51:43 +00:00
Makefile.am	initialize automake variables EXTRA_DIST and TEST_PROGS for unconditional	2007-11-21 20:09:46 +00:00