glib/gio/tests/unix-streams.c
Matthias Clasen b2715bbc5e Fix a possible deadlock
the FdSource was calling g_cancellable_disconnect while holding the
main context lock, which is bad news if the ::cancelled handler is
trying to get that lock to wake up the mainloop...

Bug 586432
2010-08-03 10:41:21 -04:00

257 lines
6.2 KiB
C

/* GLib testing framework examples and tests
* Copyright (C) 2008 Red Hat, Inc
*
* This work is provided "as is"; redistribution and modification
* in whole or in part, in any medium, physical or electronic is
* permitted without restriction.
*
* This work is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
*
* In no event shall the authors or contributors be liable for any
* direct, indirect, incidental, special, exemplary, or consequential
* damages (including, but not limited to, procurement of substitute
* goods or services; loss of use, data, or profits; or business
* interruption) however caused and on any theory of liability, whether
* in contract, strict liability, or tort (including negligence or
* otherwise) arising in any way out of the use of this software, even
* if advised of the possibility of such damage.
*/
#include <gio/gio.h>
#include <gio/gunixinputstream.h>
#include <gio/gunixoutputstream.h>
#include <signal.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#define DATA "abcdefghijklmnopqrstuvwxyz"
int writer_pipe[2], reader_pipe[2];
GCancellable *writer_cancel, *reader_cancel, *main_cancel;
GMainLoop *loop;
static gpointer
writer_thread (gpointer user_data)
{
GOutputStream *out;
gssize nwrote, offset;
GError *err = NULL;
out = g_unix_output_stream_new (writer_pipe[1], TRUE);
do
{
g_usleep (10);
offset = 0;
while (offset < (gssize) sizeof (DATA))
{
nwrote = g_output_stream_write (out, DATA + offset,
sizeof (DATA) - offset,
writer_cancel, &err);
if (nwrote <= 0 || err != NULL)
break;
offset += nwrote;
}
g_assert (nwrote > 0 || err != NULL);
}
while (err == NULL);
if (g_cancellable_is_cancelled (writer_cancel))
{
g_cancellable_cancel (main_cancel);
g_object_unref (out);
return NULL;
}
g_warning ("writer: %s", err->message);
g_assert_not_reached ();
}
static gpointer
reader_thread (gpointer user_data)
{
GInputStream *in;
gssize nread = 0, total;
GError *err = NULL;
char buf[sizeof (DATA)];
in = g_unix_input_stream_new (reader_pipe[0], TRUE);
do
{
total = 0;
while (total < (gssize) sizeof (DATA))
{
nread = g_input_stream_read (in, buf + total, sizeof (buf) - total,
reader_cancel, &err);
if (nread <= 0 || err != NULL)
break;
total += nread;
}
if (err)
break;
if (nread == 0)
{
g_assert (err == NULL);
/* pipe closed */
g_object_unref (in);
return NULL;
}
g_assert_cmpstr (buf, ==, DATA);
g_assert (!g_cancellable_is_cancelled (reader_cancel));
}
while (err == NULL);
g_warning ("reader: %s", err->message);
g_assert_not_reached ();
}
char main_buf[sizeof (DATA)];
gssize main_len, main_offset;
static void readable (GObject *source, GAsyncResult *res, gpointer user_data);
static void writable (GObject *source, GAsyncResult *res, gpointer user_data);
static void
do_main_cancel (GOutputStream *out)
{
g_output_stream_close (out, NULL, NULL);
g_main_loop_quit (loop);
}
static void
readable (GObject *source, GAsyncResult *res, gpointer user_data)
{
GInputStream *in = G_INPUT_STREAM (source);
GOutputStream *out = user_data;
GError *err = NULL;
main_len = g_input_stream_read_finish (in, res, &err);
if (g_cancellable_is_cancelled (main_cancel))
{
do_main_cancel (out);
return;
}
g_assert (err == NULL);
main_offset = 0;
g_output_stream_write_async (out, main_buf, main_len,
G_PRIORITY_DEFAULT, main_cancel,
writable, in);
}
static void
writable (GObject *source, GAsyncResult *res, gpointer user_data)
{
GOutputStream *out = G_OUTPUT_STREAM (source);
GInputStream *in = user_data;
GError *err = NULL;
gssize nwrote;
nwrote = g_output_stream_write_finish (out, res, &err);
if (g_cancellable_is_cancelled (main_cancel))
{
do_main_cancel (out);
return;
}
g_assert (err == NULL);
g_assert_cmpint (nwrote, <=, main_len - main_offset);
main_offset += nwrote;
if (main_offset == main_len)
{
g_input_stream_read_async (in, main_buf, sizeof (main_buf),
G_PRIORITY_DEFAULT, main_cancel,
readable, out);
}
else
{
g_output_stream_write_async (out, main_buf + main_offset,
main_len - main_offset,
G_PRIORITY_DEFAULT, main_cancel,
writable, in);
}
}
static gboolean
timeout (gpointer cancellable)
{
g_cancellable_cancel (cancellable);
return FALSE;
}
static void
test_pipe_io (void)
{
GThread *writer, *reader;
GInputStream *in;
GOutputStream *out;
/* Split off two (additional) threads, a reader and a writer. From
* the writer thread, write data synchronously in small chunks,
* which gets read asynchronously by the main thread and then
* written asynchronously to the reader thread, which reads it
* synchronously. Eventually a timeout in the main thread will cause
* it to cancel the writer thread, which will in turn cancel the
* read op in the main thread, which will then close the pipe to
* the reader thread, causing the read op to fail.
*/
g_assert (pipe (writer_pipe) == 0 && pipe (reader_pipe) == 0);
writer_cancel = g_cancellable_new ();
reader_cancel = g_cancellable_new ();
main_cancel = g_cancellable_new ();
writer = g_thread_create (writer_thread, NULL, TRUE, NULL);
reader = g_thread_create (reader_thread, NULL, TRUE, NULL);
in = g_unix_input_stream_new (writer_pipe[0], TRUE);
out = g_unix_output_stream_new (reader_pipe[1], TRUE);
g_input_stream_read_async (in, main_buf, sizeof (main_buf),
G_PRIORITY_DEFAULT, main_cancel,
readable, out);
g_timeout_add (500, timeout, writer_cancel);
loop = g_main_loop_new (NULL, TRUE);
g_main_loop_run (loop);
g_main_loop_unref (loop);
g_thread_join (reader);
g_thread_join (writer);
g_object_unref (main_cancel);
g_object_unref (reader_cancel);
g_object_unref (writer_cancel);
g_object_unref (in);
g_object_unref (out);
}
int
main (int argc,
char *argv[])
{
g_thread_init (NULL);
g_type_init ();
g_test_init (&argc, &argv, NULL);
g_test_add_func ("/unix-streams/pipe-io-test", test_pipe_io);
return g_test_run();
}