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84d4150668
Greetings,
We use libunwind just for stack traces (I suspect many others do as well).
The use pattern is:
GetStackTrace(void** result, int max_depth)
{
...
unw_getcontext(&uc);
unw_init_local(&cursor, &uc);
while (n < max_depth) {
if (unw_get_reg(&cursor, UNW_REG_IP, (unw_word_t *) &ip) < 0) {
break;
}
result[n++] = ip;
if (unw_step(&cursor) <= 0) {
break;
}
}
Given this usage, it is quite convenient for us to block signals (or
prevent signal handlers from re-entering libunwind by other means) at the
"top level", which makes most of the sigprocmask calls performed by
libunwind itself unneccessary.
The second patch in this series adds a configure option which removes most
of the sigprocmask calls.
Attached patch is a preliminary for it -- consolidating all of the
"sigprocmask; mutex_lock;" sequences into lock_acquire and "mutex_unlock;
sigprocmask;" sequences into lock_release.
Thanks,
--
Paul Pluzhnikov
commit 402d15b123d54a7669db7cf17a76dd315094e472
Author: Paul Pluzhnikov <ppluzhnikov@google.com>
Date: Mon Sep 21 10:18:28 2009 -0700
Replace "sigprocmask + mutext_lock" with a single lock_acquire.
Likewise, replace "mutext_unlock + sigprocmask" with lock_release.
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| .. | ||
| arm | ||
| dwarf | ||
| hppa | ||
| ia64 | ||
| mi | ||
| mips | ||
| ppc | ||
| ppc32 | ||
| ppc64 | ||
| ptrace | ||
| setjmp | ||
| unwind | ||
| x86 | ||
| x86_64 | ||
| elf32.c | ||
| elf32.h | ||
| elf64.c | ||
| elf64.h | ||
| elfxx.c | ||
| elfxx.h | ||
| Makefile.am | ||
| os-hpux.c | ||
| os-linux.c | ||
| os-linux.h | ||