From f43cce23adde58d44081e46279c7fd655d4246ec Mon Sep 17 00:00:00 2001 From: Jeff King Date: Thu, 16 Apr 2015 04:48:45 -0400 Subject: git-compat-util: add fallbacks for unlocked stdio POSIX.1-2001 specifies some functions for optimizing the locking out of tight getc() loops. Not all systems are POSIX, though, and even not all POSIX systems are required to implement these functions. We can check for the feature-test macro to see if they are available, and if not, provide a noop implementation. There's no Makefile knob here, because we should just detect this automatically. If there are very bizarre systems, we may need to add one, but it's not clear yet in which direction: 1. If a system defines _POSIX_THREAD_SAFE_FUNCTIONS but these functions are missing or broken, we would want a knob to manually turn them off. 2. If a system has these functions but does not define _POSIX_THREAD_SAFE_FUNCTIONS, we would want a knob to manually turn them on. We can add such a knob when we find a real-world system that matches this. Signed-off-by: Jeff King Signed-off-by: Junio C Hamano --- git-compat-util.h | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'git-compat-util.h') diff --git a/git-compat-util.h b/git-compat-util.h index bc8fc8cf85..685a0a4063 100644 --- a/git-compat-util.h +++ b/git-compat-util.h @@ -883,4 +883,10 @@ struct tm *git_gmtime_r(const time_t *, struct tm *); # define SHELL_PATH "/bin/sh" #endif +#ifndef _POSIX_THREAD_SAFE_FUNCTIONS +#define flockfile(fh) +#define funlockfile(fh) +#define getc_unlocked(fh) getc(fh) +#endif + #endif -- cgit v1.2.3