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diff --git a/boehm-gc/README.win32 b/boehm-gc/README.win32 deleted file mode 100644 index d78816b555d..00000000000 --- a/boehm-gc/README.win32 +++ /dev/null @@ -1,149 +0,0 @@ -The collector has only been compiled under Windows NT, with the -original Microsoft SDK, with Visual C++ 2.0 and later, with -the GNU win32 environment, with Borland 4.5, and recently with -Watcom C. - -It runs under both win32s and win32, but with different semantics. -Under win32, all writable pages outside of the heaps and stack are -scanned for roots. Thus the collector sees pointers in DLL data -segments. Under win32s, only the main data segment is scanned. -(The main data segment should always be scanned. Under some -versions of win32s, other regions may also be scanned.) -Thus all accessible objects should be accessible from local variables -or variables in the main data segment. Alternatively, other data -segments (e.g. in DLLs) may be registered with the collector by -calling GC_init() and then GC_register_root_section(a), where -a is the address of some variable inside the data segment. (Duplicate -registrations are ignored, but not terribly quickly.) - -(There are two reasons for this. We didn't want to see many 16:16 -pointers. And the VirtualQuery call has different semantics under -the two systems, and under different versions of win32s.) - -The collector test program "gctest" is linked as a GUI application, -but does not open any windows. Its output appears in the file -"gc.log". It may be started from the file manager. The hour glass -cursor will appear as long as it's running. If it is started from the -command line, it will usually run in the background. Wait a few -minutes (a few seconds on a modern machine) before you check the output. -You should see either a failure indication or a "Collector appears to -work" message. - -The cord test program has not been ported (but should port -easily). A toy editor (cord/de.exe) based on cords (heavyweight -strings represented as trees) has been ported and is included. -It runs fine under either win32 or win32S. It serves as an example -of a true Windows application, except that it was written by a -nonexpert Windows programmer. (There are some peculiarities -in the way files are displayed. The <cr> is displayed explicitly -for standard DOS text files. As in the UNIX version, control -characters are displayed explicitly, but in this case as red text. -This may be suboptimal for some tastes and/or sets of default -window colors.) - -For Microsoft development tools, rename NT_MAKEFILE as -MAKEFILE. (Make sure that the CPU environment variable is defined -to be i386.) - -For GNU-win32, use the regular makefile, possibly after uncommenting -the line "include Makefile.DLLs". The latter should be necessary only -if you want to package the collector as a DLL. The GNU-win32 port is -believed to work only for b18, not b19, probably dues to linker changes -in b19. This is probably fixable with a different definition of -DATASTART and DATAEND in gcconfig.h. - -For Borland tools, use BCC_MAKEFILE. Note that -Borland's compiler defaults to 1 byte alignment in structures (-a1), -whereas Visual C++ appears to default to 8 byte alignment (/Zp8). -The garbage collector in its default configuration EXPECTS AT -LEAST 4 BYTE ALIGNMENT. Thus the BORLAND DEFAULT MUST -BE OVERRIDDEN. (In my opinion, it should usually be anyway. -I expect that -a1 introduces major performance penalties on a -486 or Pentium.) Note that this changes structure layouts. (As a last -resort, gcconfig.h can be changed to allow 1 byte alignment. But -this has significant negative performance implications.) -The Makefile is set up to assume Borland 4.5. If you have another -version, change the line near the top. By default, it does not -require the assembler. If you do have the assembler, I recommend -removing the -DUSE_GENERIC. - -Incremental collection support was recently added. This is -currently pretty simpleminded. Pages are protected. Protection -faults are caught by a handler installed at the bottom of the handler -stack. This is both slow and interacts poorly with a debugger. -Whenever possible, I recommend adding a call to -GC_enable_incremental at the last possible moment, after most -debugging is complete. Unlike the UNIX versions, no system -calls are wrapped by the collector itself. It may be necessary -to wrap ReadFile calls that use a buffer in the heap, so that the -call does not encounter a protection fault while it's running. -(As usual, none of this is an issue unless GC_enable_incremental -is called.) - -Note that incremental collection is disabled with -DSMALL_CONFIG, -which is the default for win32. If you need incremental collection, -undefine SMALL_CONFIG. - -Incremental collection is not supported under win32s, and it may not -be possible to do so. However, win32 applications that attempt to use -incremental collection should continue to run, since the -collector detects if it's running under win32s and turns calls to -GC_enable_incremental() into noops. - -James Clark has contributed the necessary code to support win32 threads. -This code is known to exhibit some problems with incremental collection -enabled. Use NT_THREADS_MAKEFILE (a.k.a gc.mak) instead of NT_MAKEFILE -to build this version. Note that this requires some files whose names -are more than 8 + 3 characters long. Thus you should unpack the tar file -so that long file names are preserved. To build the garbage collector -test with VC++ from the command line, use - -nmake /F ".\gc.mak" CFG="gctest - Win32 Release" - -This requires that the subdirectory gctest\Release exist. -The test program and DLL will reside in the Release directory. - -This version relies on the collector residing in a dll. - -This version currently supports incremental collection only if it is -enabled before any additional threads are created. -Version 4.13 attempts to fix some of the earlier problems, but there -may be other issues. If you need solid support for win32 threads, you -might check with Geodesic Systems. Their collector must be licensed, -but they have invested far more time in win32-specific issues. - -Hans - -Ivan V. Demakov's README for the Watcom port: - -The collector has been compiled with Watcom C 10.6 and 11.0. -It runs under win32, win32s, and even under msdos with dos4gw -dos-extender. It should also run under OS/2, though this isn't -tested. Under win32 the collector can be built either as dll -or as static library. - -Note that all compilations were done under Windows 95 or NT. -For unknown reason compiling under Windows 3.11 for NT (one -attempt has been made) leads to broken executables. - -Incremental collection is not supported. - -cord is not ported. - -Before compiling you may need to edit WCC_MAKEFILE to set target -platform, library type (dynamic or static), calling conventions, and -optimization options. - -To compile the collector and testing programs use the command: - wmake -f WCC_MAKEFILE - -All programs using gc should be compiled with 4-byte alignment. -For further explanations on this see comments about Borland. - -If gc compiled as dll, the macro ``GC_DLL'' should be defined before -including "gc.h" (for example, with -DGC_DLL compiler option). It's -important, otherwise resulting programs will not run. - -Ivan Demakov (email: ivan@tgrad.nsk.su) - - |