From 88a2d0007db222c339f0b6a17794a2014a241892 Mon Sep 17 00:00:00 2001
From: Daniel Wilhelm <daniel@wili.li>
Date: Fri, 18 Apr 2014 17:16:21 +0200
Subject: 4.3

---
 zen/process_status.h | 40 +++++++++++++++++++++++++++++++++-------
 1 file changed, 33 insertions(+), 7 deletions(-)

(limited to 'zen/process_status.h')

diff --git a/zen/process_status.h b/zen/process_status.h
index cc5825aa..15266b28 100644
--- a/zen/process_status.h
+++ b/zen/process_status.h
@@ -3,29 +3,55 @@
 
 #ifdef FFS_WIN
 #include "win.h" //includes "windows.h"
+
+#elif defined FFS_LINUX
 #endif
 
 namespace zen
 {
-struct DisableStandby //signal a "busy" state to the operating system
+struct PreventStandby //signal a "busy" state to the operating system
 {
 #ifdef FFS_WIN
-    DisableStandby() { ::SetThreadExecutionState(ES_CONTINUOUS | ES_SYSTEM_REQUIRED /* | ES_AWAYMODE_REQUIRED*/ ); }
-    ~DisableStandby() { ::SetThreadExecutionState(ES_CONTINUOUS); }
+    PreventStandby() { ::SetThreadExecutionState(ES_CONTINUOUS | ES_SYSTEM_REQUIRED /* | ES_AWAYMODE_REQUIRED*/ ); }
+    ~PreventStandby() { ::SetThreadExecutionState(ES_CONTINUOUS); }
 #endif
 };
 
 
+struct ScheduleForBackgroundProcessing //lower CPU and file I/O priorities
+{
+#ifdef FFS_WIN
 #ifndef PROCESS_MODE_BACKGROUND_BEGIN
 #define PROCESS_MODE_BACKGROUND_BEGIN     0x00100000 // Windows Server 2003 and Windows XP/2000:  This value is not supported!
 #define PROCESS_MODE_BACKGROUND_END       0x00200000 //
 #endif
 
-struct ScheduleForBackgroundProcessing //lower CPU and file I/O priorities
-{
-#ifdef FFS_WIN
-    ScheduleForBackgroundProcessing() { ::SetPriorityClass(::GetCurrentProcess(), PROCESS_MODE_BACKGROUND_BEGIN); }
+    ScheduleForBackgroundProcessing() { ::SetPriorityClass(::GetCurrentProcess(), PROCESS_MODE_BACKGROUND_BEGIN); } //this call lowers CPU priority, too!!
     ~ScheduleForBackgroundProcessing() { ::SetPriorityClass(::GetCurrentProcess(), PROCESS_MODE_BACKGROUND_END); }
+
+#elif defined FFS_LINUX
+    /*
+    CPU prio:
+    int getpriority(PRIO_PROCESS, 0); - errno caveat!
+    int ::setpriority(PRIO_PROCESS, 0, int prio); //a zero value for "who" denotes the calling process
+
+    priority can be decreased, but NOT increased :(
+
+    file I/O prio:
+        ScheduleForBackgroundProcessing() : oldIoPrio(::ioprio_get(IOPRIO_WHO_PROCESS, ::getpid()))
+        {
+            if (oldIoPrio != -1)
+                ::ioprio_set(IOPRIO_WHO_PROCESS, ::getpid(), IOPRIO_PRIO_VALUE(IOPRIO_CLASS_IDLE, 0));
+        }
+        ~ScheduleForBackgroundProcessing()
+        {
+            if (oldIoPrio != -1)
+                ::ioprio_set(IOPRIO_WHO_PROCESS, ::getpid(), oldIoPrio);
+          }
+
+    private:
+            const int oldIoPrio;
+    */
 #endif
 };
 }
-- 
cgit