adding test from Markus (adapted by me to C and MHD-style)

AUTHORS

@@ -23,6 +23,7 @@ Matthew Moore
 Colin Caughie <c.caughie@indigovision.com>
 David Carvalho <andaris@gmail.com>
 David Reiss <dreiss@facebook.com>
+Markus Doppelbauer <doppelbauer@gmx.net>
 Matt Holiday
 Michael Cronenworth <mike@cchtml.com>
 Milan Straka <straka@ufal.mff.cuni.cz>

src/testcurl/Makefile.am

@@ -52,6 +52,7 @@ check_PROGRAMS = \
 if HAVE_POSIX_THREADS
 check_PROGRAMS += \
   test_quiesce \
+  test_quiesce_stream \
   test_concurrent_stop \
   perf_get_concurrent
 endif
@@ -114,6 +115,14 @@ test_quiesce_LDADD = \
   $(top_builddir)/src/microhttpd/libmicrohttpd.la \
   $(PTHREAD_LIBS) @LIBCURL@
 
+test_quiesce_stream_SOURCES = \
+  test_quiesce_stream.c
+test_quiesce_stream_CFLAGS = \
+  $(PTHREAD_CFLAGS) $(AM_CFLAGS)
+test_quiesce_stream_LDADD = \
+  $(top_builddir)/src/microhttpd/libmicrohttpd.la \
+  $(PTHREAD_LIBS) @LIBCURL@
+
 test_callback_SOURCES = \
   test_callback.c
 test_callback_LDADD = \

src/testcurl/test_quiesce_stream.c

@@ -0,0 +1,207 @@
+/*
+     This file is part of libmicrohttpd
+     Copyright (C) 2016 Christian Grothoff
+
+     libmicrohttpd is free software; you can redistribute it and/or modify
+     it under the terms of the GNU General Public License as published
+     by the Free Software Foundation; either version 2, or (at your
+     option) any later version.
+
+     libmicrohttpd 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.  See the GNU
+     General Public License for more details.
+
+     You should have received a copy of the GNU General Public License
+     along with libmicrohttpd; see the file COPYING.  If not, write to the
+     Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+     Boston, MA 02110-1301, USA.
+*/
+/**
+ * @file test_quiesce_stream.c
+ * @brief  Testcase for libmicrohttpd quiescing
+ * @author Markus Doppelbauer
+ * @author Christian Grothoff
+ */
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <errno.h>
+#include <arpa/inet.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <pthread.h>
+#include <microhttpd.h>
+
+
+static volatile unsigned int request_counter;
+
+
+static void
+http_PanicCallback (void *cls,
+                    const char *file,
+                    unsigned int line,
+                    const char *reason)
+{
+  fprintf( stderr,
+           "PANIC: exit process: %s at %s:%u\n",
+           reason,
+           file,
+           line);
+  exit (EXIT_FAILURE);
+}
+
+
+static void *
+resume_connection (void *arg)
+{
+  struct MHD_Connection *connection = arg;
+
+  MHD_resume_connection (connection);
+  return NULL;
+}
+
+
+static void
+suspend_connection (struct MHD_Connection *connection)
+{
+  pthread_t thread_id;
+
+  MHD_suspend_connection (connection);
+  int status = pthread_create (&thread_id,
+                               NULL,
+                               &resume_connection,
+                               connection);
+  if (0 != status)
+    {
+      fprintf (stderr,
+               "Could not create thead\n");
+      exit( EXIT_FAILURE );
+    }
+  pthread_detach (thread_id);
+}
+
+
+struct ContentReaderUserdata
+{
+  int bytes_written;
+  struct MHD_Connection *connection;
+};
+
+
+static ssize_t
+http_ContentReaderCallback (void *cls,
+                            uint64_t pos,
+                            char *buf,
+                            size_t max)
+{
+  static const char alphabet[] = "\nABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
+  struct ContentReaderUserdata *userdata = cls;
+
+  if( userdata->bytes_written >= 1024)
+    {
+      fprintf( stderr,
+               "finish: %d\n",
+               request_counter);
+      return MHD_CONTENT_READER_END_OF_STREAM;
+    }
+  userdata->bytes_written++;
+  buf[0] = alphabet[userdata->bytes_written % (sizeof(alphabet) - 1)];
+  suspend_connection (userdata->connection);
+
+  return 1;
+}
+
+
+static int
+http_AccessHandlerCallback (void *cls,
+                            struct MHD_Connection *connection,
+                            const char *url,
+                            const char *method,
+                            const char *version,
+                            const char *upload_data,
+                            size_t *upload_data_size,
+                            void **con_cls )
+{
+  int ret;
+
+  /* Never respond on first call */
+  if (NULL == *con_cls)
+  {
+    fprintf (stderr,
+             "start: %d\n",
+              ++request_counter);
+
+    struct ContentReaderUserdata *userdata = malloc (sizeof(struct ContentReaderUserdata));
+
+    if (NULL == userdata)
+      return MHD_NO;
+    userdata->bytes_written = 0;
+    userdata->connection = connection;
+    *con_cls = userdata;
+    return MHD_YES;
+  }
+
+  /* Second call: create response */
+  struct MHD_Response *response
+    = MHD_create_response_from_callback (-1,
+                                         32 * 1024,
+                                         &http_ContentReaderCallback,
+                                         *con_cls,
+                                         NULL);
+  ret = MHD_queue_response (connection,
+                            MHD_HTTP_OK,
+                            response);
+  MHD_destroy_response (response);
+
+  suspend_connection (connection);
+  return ret;
+}
+
+
+int
+main()
+{
+  // Panic callback
+  MHD_set_panic_func (&http_PanicCallback,
+                      NULL);
+
+  // Flags
+  unsigned int daemon_flags
+    = MHD_USE_SELECT_INTERNALLY
+    | MHD_USE_EPOLL
+    | MHD_USE_SUSPEND_RESUME
+    | MHD_USE_PIPE_FOR_SHUTDOWN;
+
+  // Create daemon
+  struct MHD_Daemon *daemon = MHD_start_daemon (daemon_flags,
+                                                8000,
+                                                NULL,
+                                                NULL,
+                                                &http_AccessHandlerCallback,
+                                                NULL,
+                                                MHD_OPTION_END);
+  if (NULL == daemon)
+    return EXIT_FAILURE;
+  if (0 != system ("wget --server-response -q -O - 127.0.0.1:8000"))
+    {
+      MHD_stop_daemon (daemon);
+      return EXIT_SUCCESS;
+    }
+  // wait for a request
+  while (0 == request_counter)
+    sleep (1);
+
+  fprintf (stderr,
+           "quiesce\n");
+  MHD_quiesce_daemon (daemon);
+
+  /* wait a second */
+  sleep (1);
+
+  fprintf (stderr,
+           "stopping daemon\n");
+  MHD_stop_daemon (daemon);
+
+  return EXIT_SUCCESS;
+}