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[Bug libstdc++/75402] std::condition_variable::wait_until wakes up constantly
- From: "redi at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Tue, 16 Aug 2016 09:16:07 +0000
- Subject: [Bug libstdc++/75402] std::condition_variable::wait_until wakes up constantly
- Authentication-results: sourceware.org; auth=none
- Auto-submitted: auto-generated
- References: <bug-75402-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=75402
--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
I can't reproduce this with any version of GCC, so either you have a weird
config, or a weird kernel, or something else that is impossible to tell without
the requested info.
I see a single futex wait and the expected output:
futex(0x7ffc8707f5d4, FUTEX_WAIT_BITSET_PRIVATE|FUTEX_CLOCK_REALTIME, 1,
{1471338875, 919280648}, ffffffff) = -1 ETIMEDOUT (Connection timed out)
fstat(1, {st_mode=S_IFCHR|0600, st_rdev=makedev(136, 2), ...}) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
0x7f0fb8b88000
write(1, "new_now - now = 2000 ms\n", 24new_now - now = 2000 ms
) = 24
write(1, "Done.\n", 6Done.
) = 6
futex(0x7ffc8707f600, FUTEX_WAKE_PRIVATE, 1) = 0
exit_group(0) = ?