Provide usleep() in CSystemUtils interface

src/app/app.cpp

@@ -52,7 +52,6 @@
 
 #include <stdlib.h>
 #include <libintl.h>
-#include <unistd.h>
 #include <getopt.h>
 #include <localename.h>
 
@@ -1009,7 +1008,7 @@ int CApplication::Run()
 
             if (m_lowCPU)
             {
-                usleep(20000); // should still give plenty of fps
+                GetSystemUtils()->Usleep(20000); // should still give plenty of fps
             }
         }
     }

src/app/system.h

@@ -140,6 +140,9 @@ public:
 
     //! Returns the save dir location
     virtual std::string GetSaveDir();
+
+    //! Sleep for given amount of microseconds
+    virtual void Usleep(int usecs) = 0;
 };
 
 //! Global function to get CSystemUtils instance

src/app/system_linux.cpp

@@ -22,6 +22,7 @@
 #include "common/logger.h"
 
 #include <stdlib.h>
+#include <unistd.h>
 
 
 void CSystemUtilsLinux::Init()
@@ -123,3 +124,8 @@ std::string CSystemUtilsLinux::GetSaveDir()
 
     return savegameDir;
 }
+
+void CSystemUtilsLinux::Usleep(int usec)
+{
+    usleep(usec);
+}

src/app/system_linux.h

@@ -50,6 +50,8 @@ public:
 
     virtual std::string GetSaveDir() OVERRIDE;
 
+    virtual void Usleep(int usec) OVERRIDE;
+
 private:
     bool m_zenityAvailable;
 };

src/app/system_macosx.cpp

@@ -22,6 +22,7 @@
 #include "common/logger.h"
 
 #include <stdlib.h>
+#include <unistd.h>
 
 // MacOS-specific headers
 #include <CoreFoundation/CFBundle.h>
@@ -106,3 +107,8 @@ std::string CSystemUtilsMacOSX::GetSaveDir()
 
     return savegameDir;
 }
+
+void CSystemUtilsMacOSX::Usleep(int usec)
+{
+    usleep(usec);
+}

src/app/system_macosx.h

@@ -33,6 +33,9 @@ public:
     virtual std::string GetDataPath() OVERRIDE;
     virtual std::string GetLangPath() OVERRIDE;
     virtual std::string GetSaveDir() OVERRIDE;
+
+    virtual void Usleep(int usec) OVERRIDE;
+
 private:
     std::string m_ASPath;
     std::string m_dataPath;

src/app/system_other.cpp

@@ -40,3 +40,7 @@ long long int CSystemUtilsOther::TimeStampExactDiff(SystemTimeStamp* before, Sys
     return (after->sdlTicks - before->sdlTicks) * 1000000ll;
 }
 
+void CSystemUtilsOther::Usleep(int usec)
+{
+    SDL_Delay(usec / 1000); // close enough
+}

src/app/system_other.h

@@ -48,5 +48,7 @@ public:
     virtual void GetCurrentTimeStamp(SystemTimeStamp *stamp) OVERRIDE;
     virtual long long int GetTimeStampExactResolution() OVERRIDE;
     virtual long long TimeStampExactDiff(SystemTimeStamp *before, SystemTimeStamp *after) OVERRIDE;
+
+    virtual void Usleep(int usec) OVERRIDE;
 };
 

src/app/system_windows.cpp

@@ -130,3 +130,14 @@ std::string CSystemUtilsWindows::GetSaveDir()
 
     return savegameDir;
 }
+
+void CSystemUtilsWindows::Usleep(int usec)
+{
+   LARGE_INTEGER ft;
+   ft.QuadPart = -(10 * usec); // Convert to 100 nanosecond interval, negative value indicates relative time
+
+   HANDLE timer = CreateWaitableTimer(NULL, TRUE, NULL);
+   SetWaitableTimer(timer, &ft, 0, NULL, NULL, 0);
+   WaitForSingleObject(timer, INFINITE);
+   CloseHandle(timer);
+}

src/app/system_windows.h

@@ -48,6 +48,8 @@ public:
 
     virtual std::string GetSaveDir() OVERRIDE;
 
+    virtual void Usleep(int usec) OVERRIDE;
+
 public:
     static std::string UTF8_Encode(const std::wstring &wstr);
     static std::wstring UTF8_Decode(const std::string &str);

test/unit/app/system_mock.h

@@ -63,4 +63,5 @@ public:
     MOCK_METHOD0(GetTimeStampExactResolution, long long());
     MOCK_METHOD3(TimeStampDiff, float(SystemTimeStamp *before, SystemTimeStamp *after, SystemTimeUnit unit));
     MOCK_METHOD2(TimeStampExactDiff, long long(SystemTimeStamp *before, SystemTimeStamp *after));
+    MOCK_METHOD1(Usleep, void(int usec));
 };