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| author | Jonathan Wakely <jwakely@redhat.com> | 2020-11-25 10:26:09 +0000 |
|---|---|---|
| committer | Jonathan Wakely <jwakely@redhat.com> | 2020-11-25 10:31:55 +0000 |
| commit | ad9cbcee543ecccd79fa49dafcd925532d2ce210 (patch) | |
| tree | 5d83551cb2e35ebc9f478391c791ca686c8b7ead /gcc/tree-ssa-loop-split.c | |
| parent | a7285c8659689e9ade53fcb996b26d874455a4f3 (diff) | |
| download | gcc-ad9cbcee543ecccd79fa49dafcd925532d2ce210.zip gcc-ad9cbcee543ecccd79fa49dafcd925532d2ce210.tar.gz gcc-ad9cbcee543ecccd79fa49dafcd925532d2ce210.tar.bz2 | |
libstdc++: Fix handling of futex wake [PR 97936]
The __platform_wait function is supposed to wait until *addr != old.
The futex syscall checks the initial value and returns EAGAIN if *addr
!= old is already true, which should cause __platform_wait to return.
Instead it loops and keeps doing a futex wait, which keeps returning
EAGAIN.
libstdc++-v3/ChangeLog:
PR libstdc++/97936
* include/bits/atomic_wait.h (__platform_wait): Return if futex
sets EAGAIN.
* testsuite/30_threads/latch/3.cc: Re-enable test.
* testsuite/30_threads/semaphore/try_acquire_until.cc: Likewise.
Diffstat (limited to 'gcc/tree-ssa-loop-split.c')
0 files changed, 0 insertions, 0 deletions