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index-pack: Disable threading on cygwin

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The Cygwin implementation of pread() is not thread-safe since, just
like the emulation provided by compat/pread.c, it uses a sequence of
seek-read-seek calls. In order to avoid failues due to thread-safety
issues, commit b038a61 disables threading when NO_PREAD is defined.
(ie when using the emulation code in compat/pread.c).

We introduce a new build variable, NO_THREAD_SAFE_PREAD, which allows
use to disable the threaded index-pack code on cygwin, in addition to
the above NO_PREAD case.

Signed-off-by: Ramsay Jones <ramsay@ramsay1.demon.co.uk>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Junio C Hamano 2012-06-26 19:19:32 +01:00
parent 4c8a9db6f7
commit c0f86547c5
2 changed files with 10 additions and 2 deletions
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8
Makefile
View File

@ -158,6 +158,9 @@ all::
# Define NO_PREAD if you have a problem with pread() system call (e.g.
# cygwin1.dll before v1.5.22).
#
# Define NO_THREAD_SAFE_PREAD if your pread() implementation is not
# thread-safe. (e.g. compat/pread.c or cygwin)
#
# Define NO_FAST_WORKING_DIRECTORY if accessing objects in pack files is
# generally faster on your platform than accessing the working directory.
#
@ -1051,6 +1054,7 @@ ifeq ($(uname_O),Cygwin)
NO_IPV6 = YesPlease
OLD_ICONV = UnfortunatelyYes
endif
NO_THREAD_SAFE_PREAD = YesPlease
NEEDS_LIBICONV = YesPlease
NO_FAST_WORKING_DIRECTORY = UnfortunatelyYes
NO_TRUSTABLE_FILEMODE = UnfortunatelyYes
@ -1659,6 +1663,10 @@ endif
ifdef NO_PREAD
COMPAT_CFLAGS += -DNO_PREAD
COMPAT_OBJS += compat/pread.o
NO_THREAD_SAFE_PREAD = YesPlease
endif
ifdef NO_THREAD_SAFE_PREAD
BASIC_CFLAGS += -DNO_THREAD_SAFE_PREAD
endif
ifdef NO_FAST_WORKING_DIRECTORY
BASIC_CFLAGS += -DNO_FAST_WORKING_DIRECTORY

4
builtin/index-pack.c
View File

@ -39,8 +39,8 @@ struct base_data {
int ofs_first, ofs_last;
};
#if !defined(NO_PTHREADS) && defined(NO_PREAD)
/* NO_PREAD uses compat/pread.c, which is not thread-safe. Disable threading. */
#if !defined(NO_PTHREADS) && defined(NO_THREAD_SAFE_PREAD)
/* pread() emulation is not thread-safe. Disable threading. */
#define NO_PTHREADS
#endif