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author | Andreas Schwab <schwab@suse.de> | 2018-11-08 14:28:22 +0100 |
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committer | Andreas Schwab <schwab@suse.de> | 2018-12-13 12:22:30 +0100 |
commit | f21e8f8ca466320fed38bdb71526c574dae98026 (patch) | |
tree | b4d30072a2ae6abdf42ed0e980d49e877894ec66 /sysdeps/x86/cpu-tunables.c | |
parent | 3d265911c2aac65d978f679101594f9071024874 (diff) | |
download | glibc-f21e8f8ca466320fed38bdb71526c574dae98026.tar.gz glibc-f21e8f8ca466320fed38bdb71526c574dae98026.tar.xz glibc-f21e8f8ca466320fed38bdb71526c574dae98026.zip |
Fix rwlock stall with PREFER_WRITER_NONRECURSIVE_NP (bug 23861)
In the read lock function (__pthread_rwlock_rdlock_full) there was a code path which would fail to reload __readers while waiting for PTHREAD_RWLOCK_RWAITING to change. This failure to reload __readers into a local value meant that various conditionals used the old value of __readers and with only two threads left it could result in an indefinite stall of one of the readers (waiting for PTHREAD_RWLOCK_RWAITING to go to zero, but it never would).
Diffstat (limited to 'sysdeps/x86/cpu-tunables.c')
0 files changed, 0 insertions, 0 deletions