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Diffstat (limited to 'ChangeLog')
| -rw-r--r-- | ChangeLog | 23 |
1 files changed, 23 insertions, 0 deletions
@@ -1,3 +1,26 @@ +2013-12-20 Kaz Kylheku <kaz@kylheku.com> + + Fixing a bug and performance issue. + + Problem: we are using sigsetjmp but with a jmp_buf structure; + it requires sigjmp_buf! + + Performance issue: sigsetjmp is a dog which makes system calls. + Solution: let's roll our own cached version of sigprocmask which + only calls the real sigprocmask when the mask changes. Then + our extended_setjmp will just use regular setjmp, plus our own + custom signal saving and restoring based on the cached version. + + * signal.c (sig_blocked_cache): New variable. + (set_sig_handler): Use our sig_mask instead of sigprocmask. + (mem_set_bits, mem_clr_bits): New static functions. + (sig_mask): New function. + + * signal.h (extended_jmp_buf): New member, blocked. + (extended_setjmp): save blocked signals by peeking into + sig_blocked_cache, and restore using sig_mask. + (sig_blocked_cache, sig_mask): Declared. + 2013-12-17 Kaz Kylheku <kaz@kylheku.com> Version 72 |