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authorNguyễn Thái Ngọc Duy <pclouds@gmail.com>2018-10-27 17:29:59 (GMT)
committerJunio C Hamano <gitster@pobox.com>2018-10-29 02:22:48 (GMT)
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thread-utils: macros to unconditionally compile pthreads API
When built with NO_PTHREADS, the macros are used make the code build even though pthreads header and library may be missing. The code can still have different code paths for no threads support with HAVE_THREADS variable. There are of course impacts on no-pthreads builds: - data structure may get slightly bigger because all the mutexes and pthread_t are present (as an int) - code execution is not impacted much. Locking (in hot path) is no-op. Other wrapper function calls really should not matter much. - the binary size grows bigger because of threaded code. But at least on Linux this does not matter, if some code is not executed, it's not mapped in memory. This is a preparation step to remove "#ifdef NO_PTHREADS" in the code mostly because of maintainability. As Jeff put it > it's probably OK to stop thinking of it as "non-threaded platforms > are the default and must pay zero cost" and more as "threaded > platforms are the default, and non-threaded ones are OK to pay a > small cost as long as they still work". Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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