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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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4
builtin/index-pack.c
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@ -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