send-pack.c: move async's #ifdef NO_PTHREADS back to run-command.c
On systems that do not support multithread, start_async() is implemented with fork(). This implementation details unfortunately leak out at least in send-pack.c [1]. To keep the code base clean of NO_PTHREADS, move the this #ifdef back to run-command.c. The new wrapper function async_with_fork() at least helps suggest that this special "close()" is related to async in fork mode. [1] 09c9957c (send-pack: avoid deadlock when pack-object dies early - 2011-04-25) Signed-off-by: NNguyễn Thái Ngọc Duy <pclouds@gmail.com> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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