From 24f447e45ebe752b41b56b930f1c5bf26dfe3433 Mon Sep 17 00:00:00 2001
From: lxnay <lxnay@cd1c1023-2f26-0410-ae45-c471fc1f0318>
Date: Mon, 5 May 2008 18:02:53 +0000
Subject: [PATCH] Entropy: - introduce preliminary priority management
 infrastructure

git-svn-id: http://svn.sabayonlinux.org/projects/entropy/trunk@1918 cd1c1023-2f26-0410-ae45-c471fc1f0318
---
 libraries/entropy.py          | 13 +++++++++++++
 libraries/entropyConstants.py | 10 ++++++++++
 2 files changed, 23 insertions(+)

diff --git a/libraries/entropy.py b/libraries/entropy.py
index 06a9c7d6e..c5e28442b 100644
--- a/libraries/entropy.py
+++ b/libraries/entropy.py
@@ -280,6 +280,16 @@ class EquoInterface(TextInterface):
         else:
             raise exceptionTools.InvalidData("InvalidData: nothing to backup in etpConst with %s key" % (setting_name,))
 
+    def set_priority(self, low = 0):
+        default_nice = etpConst['default_nice']
+        current_nice = etpConst['current_nice']
+        delta = current_nice - default_nice
+        try:
+            etpConst['current_nice'] = os.nice(delta*-1+low)
+        except OSError:
+            pass
+        return current_nice # aka, the old value
+
     def switchChroot(self, chroot = ""):
         # clean caches
         self.purge_cache()
@@ -5895,6 +5905,8 @@ class RepoInterface:
                                 )
 
                 if self.Entropy.indexing:
+                    # renice a bit, to avoid eating resources
+                    old_prio = self.Entropy.set_priority(15)
                     self.Entropy.updateProgress(
                                                     red("Indexing Repository metadata ..."),
                                                     importance = 1,
@@ -5913,6 +5925,7 @@ class RepoInterface:
                             self.Entropy.clientDbconn.createAllIndexes()
                     except:
                         pass
+                    self.Entropy.set_priority(old_prio)
                 # update revision in etpRepositories
                 self.Entropy.update_repository_revision(repo)
 
diff --git a/libraries/entropyConstants.py b/libraries/entropyConstants.py
index 50a135404..de4417c0e 100644
--- a/libraries/entropyConstants.py
+++ b/libraries/entropyConstants.py
@@ -651,6 +651,9 @@ def const_defaultSettings(rootdir):
         'sysgroup': "entropy",
         'defaultumask': 022,
         'storeumask': 002,
+        'gentle_nice': 15,
+        'current_nice': 0,
+        'default_nice': 0,
         'server_treeupdatescalled': set(),
         'client_treeupdatescalled': set(),
         'spm': {
@@ -763,6 +766,13 @@ def const_defaultSettings(rootdir):
         },
 
     }
+
+    # set current nice level
+    try:
+        myConst['current_nice'] = os.nice(0)
+    except OSError:
+        pass
+
     etpConst.update(myConst)