From b130a72b274441bb5d687de93efef4d990c40c0a Mon Sep 17 00:00:00 2001 From: Janos Laube Date: Fri, 13 Mar 2009 16:50:45 +0100 Subject: MinGW: implement mmap Add USE_WIN32_MMAP which triggers the use of windows' native file memory mapping functionality in git_mmap()/git_munmap() functions. As git functions currently use mmap with MAP_PRIVATE set only, this implementation supports only that mode for now. On Windows, offsets for memory mapped files need to match the allocation granularity. Take this into account when calculating the packed git- windowsize and file offsets. At the moment, the only function which makes use of offsets in conjunction with mmap is use_pack() in sha1-file.c. Git fast-import's code path tries to map a portion of the temporary packfile that exceeds the current filesize, i.e. offset+length is greater than the filesize. The NO_MMAP code worked with that since pread() just reads the file content until EOF and returns gracefully, while MapViewOfFile() aborts the mapping and returns 'Access Denied'. Working around that by determining the filesize and adjusting the length parameter. Signed-off-by: Janos Laube Signed-off-by: Johannes Sixt Signed-off-by: Junio C Hamano --- Makefile | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) (limited to 'Makefile') diff --git a/Makefile b/Makefile index b96c2b316..aae3b0941 100644 --- a/Makefile +++ b/Makefile @@ -784,7 +784,6 @@ ifneq (,$(findstring CYGWIN,$(uname_S))) COMPAT_OBJS += compat/cygwin.o endif ifneq (,$(findstring MINGW,$(uname_S))) - NO_MMAP = YesPlease NO_PREAD = YesPlease NO_OPENSSL = YesPlease NO_CURL = YesPlease @@ -808,6 +807,7 @@ ifneq (,$(findstring MINGW,$(uname_S))) NO_POSIX_ONLY_PROGRAMS = YesPlease NO_ST_BLOCKS_IN_STRUCT_STAT = YesPlease NO_NSEC = YesPlease + USE_WIN32_MMAP = YesPlease COMPAT_CFLAGS += -D__USE_MINGW_ACCESS -DNOGDI -Icompat -Icompat/regex -Icompat/fnmatch COMPAT_CFLAGS += -DSNPRINTF_SIZE_CORR=1 COMPAT_CFLAGS += -DSTRIP_EXTENSION=\".exe\" @@ -985,6 +985,11 @@ endif ifdef NO_MMAP COMPAT_CFLAGS += -DNO_MMAP COMPAT_OBJS += compat/mmap.o +else + ifdef USE_WIN32_MMAP + COMPAT_CFLAGS += -DUSE_WIN32_MMAP + COMPAT_OBJS += compat/win32mmap.o + endif endif ifdef NO_PREAD COMPAT_CFLAGS += -DNO_PREAD -- cgit v1.2.1