percentile output for intermediate results reporting mode added #1
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httpress.c
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With such an implementation of lock_tmp_percentile()/unlock_tmp_percentile() you still have a race condition here.
E.g.: is_locked_tmp_percentile() returns 0, and then before reg_percentile_val() is called another threads locks it.
If you want to do it atomically, you need to use CAS instruction (__sync_val_compare_and_swap() gcc intrinsic).
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