Module Name: src
Committed By: riastradh
Date: Wed Jun 16 21:53:51 UTC 2021
Modified Files:
src/libexec/ld.elf_so: rtld.c
Log Message:
ld.elf_so(1): Omit needless membar_enter.
The use of membar_enter is to separate atomic r/m/w on a lock from
the body of the critical section so two different critical sections
happen in order:
body of previous critical section;
exit critical section:
membar_exit();
atomic_r/m/w(lock stuff);
enter critical section:
atomic_r/m/w(lock stuff);
membar_enter();
body of next critical section;
_rtld_shared_enter does this, but it _also_ issued an extraneous
membar_enter before the atomic_r/m/w part, which doesn't impose any
semantically important order but may cost some performance.
To generate a diff of this commit:
cvs rdiff -u -r1.208 -r1.209 src/libexec/ld.elf_so/rtld.c
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
