From 73667d1102735c42cf385442aeb2a1735bb67d6a Mon Sep 17 00:00:00 2001
From: Matthias Schiffer <matthias@gamezock.de>
Date: Thu, 21 May 2009 01:42:33 +0200
Subject: SystemBackend-Interface ueberarbeitet

---
 .../SystemBackendProc/SystemBackendProc.cpp        | 75 ++++++++++++++--------
 src/modules/SystemBackendProc/SystemBackendProc.h  | 16 ++---
 2 files changed, 55 insertions(+), 36 deletions(-)

(limited to 'src/modules/SystemBackendProc')

diff --git a/src/modules/SystemBackendProc/SystemBackendProc.cpp b/src/modules/SystemBackendProc/SystemBackendProc.cpp
index d238e07..1888227 100644
--- a/src/modules/SystemBackendProc/SystemBackendProc.cpp
+++ b/src/modules/SystemBackendProc/SystemBackendProc.cpp
@@ -24,15 +24,13 @@
 #include <cstdio>
 #include <cstring>
 
-#include <boost/bind.hpp>
-
 namespace Mad {
 namespace Modules {
 
-SystemBackendProc *SystemBackendProc::backend = 0;
+boost::shared_ptr<SystemBackendProc> SystemBackendProc::backend;
 
-bool SystemBackendProc::getUptimeInfo(const boost::function2<void, unsigned long, unsigned long> &callback) {
-  unsigned long uptime = 0, idleTime = 0;
+bool SystemBackendProc::getUptimeInfo(unsigned long *uptime, unsigned long *idleTime) {
+  Net::ThreadManager::get()->detach();
 
   uptimeFile.seekg(0, std::ios::beg);
 
@@ -44,19 +42,27 @@ bool SystemBackendProc::getUptimeInfo(const boost::function2<void, unsigned long
   if(!uptimeFile.good())
     return false;
 
-  uptime = (unsigned long)f;
+  if(uptime)
+  *uptime = (unsigned long)f;
 
   uptimeFile >> f;
-  if(uptimeFile.good())
-    idleTime = (unsigned long)f;
-
-  Net::ThreadManager::get()->pushWork(boost::bind(callback, uptime, idleTime));
+  if(uptimeFile.good() && idleTime)
+    *idleTime = (unsigned long)f;
 
   return true;
 }
 
-bool SystemBackendProc::getMemoryInfo(const boost::function4<void, unsigned long, unsigned long, unsigned long, unsigned long> &callback) {
-  unsigned long totalMem = 0, freeMem = 0, totalSwap = 0, freeSwap = 0;
+bool SystemBackendProc::getMemoryInfo(unsigned long *totalMem, unsigned long *freeMem, unsigned long *totalSwap, unsigned long *freeSwap) {
+  Net::ThreadManager::get()->detach();
+
+  if(totalMem)
+    *totalMem = 0;
+  if(freeMem)
+    *freeMem = 0;
+  if(totalSwap)
+    *totalSwap = 0;
+  if(freeSwap)
+    *freeSwap = 0;
 
   meminfoFile.seekg(0, std::ios::beg);
 
@@ -71,30 +77,30 @@ bool SystemBackendProc::getMemoryInfo(const boost::function4<void, unsigned long
     unsigned long value;
 
     if(std::sscanf(line.c_str(), "%s %lu", name, &value) == 2) {
-      if(std::strcmp(name, "MemTotal:") == 0)
-        totalMem = value;
-      else if(std::strcmp(name, "MemFree:") == 0)
-        freeMem = value;
-      else if(std::strcmp(name, "SwapTotal:") == 0)
-        totalSwap = value;
-      else if(std::strcmp(name, "SwapFree:") == 0)
-        freeSwap = value;
+      if(std::strcmp(name, "MemTotal:") == 0 && totalMem)
+        *totalMem = value;
+      else if(std::strcmp(name, "MemFree:") == 0 && freeMem)
+        *freeMem = value;
+      else if(std::strcmp(name, "SwapTotal:") == 0 && totalSwap)
+        *totalSwap = value;
+      else if(std::strcmp(name, "SwapFree:" ) == 0 && freeSwap)
+        *freeSwap = value;
     }
 
     delete [] name;
 
-    if(totalMem && freeMem && totalSwap && freeSwap)
+    if((!totalMem || *totalMem) && (!freeMem || *freeMem) && (!totalSwap || *totalSwap) && (!freeSwap || *freeSwap))
       break;
   }
 
-  Net::ThreadManager::get()->pushWork(boost::bind(callback, totalMem, freeMem, totalSwap, freeSwap));
-
   return true;
 }
 
-bool SystemBackendProc::getLoadInfo(const boost::function5<void, unsigned long, unsigned long, float, float, float> &callback) {
-  unsigned long currentLoad = 0, nProcesses = 0;
-  float loadAvg1 = 0, loadAvg5 = 0, loadAvg15 = 0;
+bool SystemBackendProc::getLoadInfo(unsigned long *currentLoad, unsigned long *nProcesses, float *loadAvg1, float *loadAvg5, float *loadAvg15) {
+  Net::ThreadManager::get()->detach();
+
+  unsigned long currentLoadValue = 0, nProcessesValue = 0;
+  float loadAvg1Value = 0, loadAvg5Value = 0, loadAvg15Value = 0;
 
   loadFile.seekg(0, std::ios::beg);
 
@@ -107,9 +113,22 @@ bool SystemBackendProc::getLoadInfo(const boost::function5<void, unsigned long,
   if(line.empty())
     return false;
 
-  std::sscanf(line.c_str(), "%f %f %f %lu/%lu", &loadAvg1, &loadAvg5, &loadAvg15, &currentLoad, &nProcesses);
+  std::sscanf(line.c_str(), "%f %f %f %lu/%lu", &loadAvg1Value, &loadAvg5Value, &loadAvg15Value, &currentLoadValue, &nProcessesValue);
+
+  if(currentLoad)
+    *currentLoad = currentLoadValue;
+
+  if(nProcesses)
+    *nProcesses = nProcessesValue;
+
+  if(loadAvg1)
+    *loadAvg1 = loadAvg1Value;
+
+  if(loadAvg5)
+    *loadAvg5 = loadAvg5Value;
 
-  Net::ThreadManager::get()->pushWork(boost::bind(callback, currentLoad, nProcesses, loadAvg1, loadAvg5, loadAvg15));
+  if(loadAvg15)
+    *loadAvg15 = loadAvg15Value;
 
   return true;
 }
diff --git a/src/modules/SystemBackendProc/SystemBackendProc.h b/src/modules/SystemBackendProc/SystemBackendProc.h
index bf19e22..9b36df4 100644
--- a/src/modules/SystemBackendProc/SystemBackendProc.h
+++ b/src/modules/SystemBackendProc/SystemBackendProc.h
@@ -23,13 +23,14 @@
 #include <Common/SystemBackend.h>
 
 #include <fstream>
+#include <boost/noncopyable.hpp>
 
 namespace Mad {
 namespace Modules {
 
-class SystemBackendProc : private Common::SystemBackend {
+class SystemBackendProc : public Common::SystemBackend, boost::noncopyable {
   private:
-    static SystemBackendProc *backend;
+    static boost::shared_ptr<SystemBackendProc> backend;
 
     std::ifstream uptimeFile;
     std::ifstream meminfoFile;
@@ -38,16 +39,16 @@ class SystemBackendProc : private Common::SystemBackend {
     SystemBackendProc() : uptimeFile("/proc/uptime"), meminfoFile("/proc/meminfo"), loadFile("/proc/loadavg") {}
 
   protected:
-    virtual bool getUptimeInfo(const boost::function2<void, unsigned long, unsigned long> &callback);
-    virtual bool getMemoryInfo(const boost::function4<void, unsigned long, unsigned long, unsigned long, unsigned long> &callback);
-    virtual bool getLoadInfo(const boost::function5<void, unsigned long, unsigned long, float, float, float> &callback);
+    virtual bool getUptimeInfo(unsigned long *uptime, unsigned long *idleTime);
+    virtual bool getMemoryInfo(unsigned long *totalMem, unsigned long *freeMem, unsigned long *totalSwap, unsigned long *freeSwap);
+    virtual bool getLoadInfo(unsigned long *currentLoad, unsigned long *nProcesses, float *loadAvg1, float *loadAvg5, float *loadAvg15);
 
   public:
     static void registerBackend() {
       if(backend)
         return;
 
-      backend = new SystemBackendProc();
+      backend.reset(new SystemBackendProc());
       Common::SystemManager::get()->registerBackend(backend);
     }
 
@@ -56,8 +57,7 @@ class SystemBackendProc : private Common::SystemBackend {
         return;
 
       Common::SystemManager::get()->unregisterBackend(backend);
-      delete backend;
-      backend = 0;
+      backend.reset();
     }
 };
 
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