janwas
a3696c0b91
lib/sysdep: clean up by moving OS and cpu-arch folders into "os" and "arch" folders This was SVN commit r6162.
78 lines
2.5 KiB
C++
78 lines
2.5 KiB
C++
/**
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* =========================================================================
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* File : winit.cpp
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* Project : 0 A.D.
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* Description : windows-specific module init and shutdown mechanism
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* =========================================================================
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*/
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// license: GPL; see lib/license.txt
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#include "precompiled.h"
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#include "winit.h"
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#include "win.h" // GetTickCount for quick'n dirty timing
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// see http://blogs.msdn.com/larryosterman/archive/2004/09/27/234840.aspx
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// for discussion of a similar mechanism.
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//
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// note: this module is kept distinct from the CRT's init/shutdown mechanism
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// to insulate against changes there. another advantage is that callbacks
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// can return LibError instead of int.
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// currently (2008-02-17) the init groups are populated as follows:
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// critical : wposix
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// early : wutil
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// early2 : whrt, wdbg_heap
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// main : waio, wsock, wtime, wdir_watch
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// late : wsdl
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typedef LibError (*PfnLibErrorVoid)(void);
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// pointers to start and end of function tables.
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// notes:
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// - COFF tosses out empty segments, so we have to put in one value
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// (zero, because CallFunctionPointers has to ignore entries =0 anyway).
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// - ASCII '$' and 'Z' come before resp. after '0'..'9', so use that to
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// bound the section names.
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__declspec(allocate(".WINIT$I$")) PfnLibErrorVoid initBegin = 0;
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__declspec(allocate(".WINIT$IZ")) PfnLibErrorVoid initEnd = 0;
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__declspec(allocate(".WINIT$S$")) PfnLibErrorVoid shutdownBegin = 0;
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__declspec(allocate(".WINIT$SZ")) PfnLibErrorVoid shutdownEnd = 0;
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// note: #pragma comment(linker, "/include") is not necessary since
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// these are referenced below.
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/**
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* call into a range of function pointers.
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* @param [begin, end): STL-style range
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*
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* note: pointers = 0 are ignored. this is because the above placeholders
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* are initialized to 0 and because the range may be larger than
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* expected due to COFF section padding (with zeroes).
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**/
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static void CallFunctionPointers(PfnLibErrorVoid* begin, PfnLibErrorVoid* end)
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{
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const DWORD t0 = GetTickCount();
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for(PfnLibErrorVoid* ppfunc = begin; ppfunc < end; ppfunc++)
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{
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if(*ppfunc)
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(*ppfunc)();
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}
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const DWORD t1 = GetTickCount();
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debug_printf("WINIT| total elapsed time in callbacks %d ms (+-10)\n", t1-t0);
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}
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void winit_CallInitFunctions()
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{
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CallFunctionPointers(&initBegin, &initEnd);
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}
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void winit_CallShutdownFunctions()
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{
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CallFunctionPointers(&shutdownBegin, &shutdownEnd);
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}
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