simplified the handling of the different states of parallel/server mode

git-svn-id: https://pycam.svn.sourceforge.net/svnroot/pycam/trunk@980 bbaffbd6-741e-11dd-a85d-61de82d9cad9

share/ui/pycam-project.ui

@@ -6292,7 +6292,23 @@ You will need remote workers.&lt;/span&gt;</property>
                               </packing>
                             </child>
                             <child>
-                              <object class="GtkFrame" id="frame1">
+                              <object class="GtkLabel" id="ServerModeDisabledLabel">
+                                <property name="visible">True</property>
+                                <property name="xalign">0</property>
+                                <property name="label" translatable="yes">Server mode is currently not available on your system.
+You are probably using the Windows standalone executable.
+Instead you could use the PyCAM installer package along with the all-in-one installer of all dependencies.
+
+See the &lt;a href="http://sf.net/apps/mediawiki/pycam/?title=Parallel_Processing_on_different_Platforms"&gt;platform feature matrix&lt;/a&gt; for details.</property>
+                                <property name="use_markup">True</property>
+                                <property name="wrap">True</property>
+                              </object>
+                              <packing>
+                                <property name="position">2</property>
+                              </packing>
+                            </child>
+                            <child>
+                              <object class="GtkFrame" id="ServerModeSettingsFrame">
                                 <property name="visible">True</property>
                                 <property name="label_xalign">0</property>
                                 <property name="shadow_type">none</property>
@@ -6530,7 +6546,7 @@ The default port is 1250.</property>
                               <packing>
                                 <property name="expand">False</property>
                                 <property name="fill">False</property>
-                                <property name="position">2</property>
+                                <property name="position">3</property>
                               </packing>
                             </child>
                           </object>
@@ -6545,16 +6561,8 @@ The default port is 1250.</property>
                             <property name="visible">True</property>
                             <property name="xalign">0</property>
                             <property name="label" translatable="yes">Parallel processing is currently not available on your system.
-Please check the following list of possible reasons and fix the problem, if possible.
-
-1) You are using the Windows standalone executable.
-Sadly this problem is not too easy to solve. Future releases of PyCAM should remove this limitation.
-
-2) You are using Python 2.5 or below and the package "multiprocessing" is &lt;i&gt;not&lt;/i&gt; installed.
-
-See the &lt;a href="http://sf.net/apps/mediawiki/pycam/?title=Parallel_Processing_on_different_Platforms"&gt;platform feature matrix&lt;/a&gt; for details.
-</property>
-                            <property name="use_markup">True</property>
+You need to switch to Python v2.6 (or higher) or install the Python module "multiprocessing".
+    </property>
                             <property name="wrap">True</property>
                           </object>
                           <packing>

src/pycam/Gui/Project.py

@@ -942,12 +942,15 @@ class ProjectGui:
         # parallel processing settings
         self.enable_parallel_processes = self.gui.get_object(
                 "EnableParallelProcesses")
-        if pycam.Utils.threading.is_parallel_processing_available():
+        if pycam.Utils.threading.is_multiprocessing_available():
             self.gui.get_object("ParallelProcessingDisabledLabel").hide()
+            if pycam.Utils.threading.is_server_mode_available():
+                self.gui.get_object("ServerModeDisabledLabel").hide()
+            else:
+                self.gui.get_object("ServerModeSettingsFrame").hide()
         else:
             self.gui.get_object("ParallelProcessSettingsBox").hide()
-            self.enable_parallel_processes.set_sensitive(False)
-            self.enable_parallel_processes.set_active(False)
+            self.gui.get_object("EnableParallelProcesses").hide()
         self.enable_parallel_processes.set_active(
                 pycam.Utils.threading.is_multiprocessing_enabled())
         self.enable_parallel_processes.connect("toggled",

src/pycam/Utils/threading.py

@@ -82,17 +82,25 @@ def run_in_parallel(*args, **kwargs):
 def is_pool_available():
     return not __manager is None
 
+def is_multiprocessing_available():
+    try:
+        import multiprocessing
+        return True
+    except ImportError:
+        return False
+
 def is_multiprocessing_enabled():
     return bool(__multiprocessing)
 
-def is_windows_parallel_processing_available():
-    # server mode is disabled for the Windows standalone executable
-    return not (hasattr(sys, "frozen") and sys.frozen)
-
-def is_parallel_processing_available():
-    if not is_windows_parallel_processing_available():
-        # Windows -> no parallel processing
+def is_server_mode_available():
+    # the following definition should be kept in sync with the wiki:
+    # http://sf.net/apps/mediawiki/pycam/?title=Parallel_Processing_on_different_Platforms
+    if pycam.Utils.get_platform() == pycam.Utils.PLATFORM_WINDOWS:
+        if hasattr(sys, "frozen") and sys.frozen:
             return False
+        else:
+            return True
+    else:
         try:
             import multiprocessing
             return True
@@ -156,8 +164,7 @@ def init_threading(number_of_processes=None, enable_server=False, remote=None,
     if __multiprocessing:
         # kill the manager and clean everything up for a re-initialization
         cleanup()
-    if (not is_windows_parallel_processing_available()) and \
-            (enable_server or run_server):
+    if (not is_server_mode_available()) and (enable_server or run_server):
         # server mode is disabled for the Windows pyinstaller standalone
         # due to "pickle errors". How to reproduce: run the standalone binary
         # with "--enable-server --server-auth-key foo".
@@ -181,16 +188,6 @@ def init_threading(number_of_processes=None, enable_server=False, remote=None,
         remote = None
         run_server = None
         server_credentials = ""
-    if not is_windows_parallel_processing_available():
-        # Running multiple processes with the Windows standalone executable
-        # causes "WindowsError: invalid handle" error messages. The processes
-        # can't communicate - thus no results are returned.
-        # Reproduce with: "--number-of-processes 2"
-        log.info("Multiprocessing capabilities are not available for the " \
-                + "Windows standable executable. Use the installer package " \
-                + "instead (if possible).")
-        mp_is_available = False
-    else:
     try:
         import multiprocessing
         mp_is_available = True