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The existing code doesn't check whether the chrono::seconds value is out of range of time_t. When using a timeout before the epoch (with a negative value) subtracting the current time (as time_t) and then assigning it to a time_t can overflow to a large positive value. This means that we end up waiting several years even though the specific timeout was in the distant past. We do have a check for negative timeouts, but that happens after the conversion to time_t so happens after the overflow. The conversion to a relative timeout is done in two places, so this factors it into a new function and adds the overflow checks there. libstdc++-v3/ChangeLog: * src/c++11/futex.cc (relative_timespec): New function to create relative time from two absolute times. (__atomic_futex_unsigned_base::_M_futex_wait_until) (__atomic_futex_unsigned_base::_M_futex_wait_until_steady): Use relative_timespec. |
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| .. | ||
| config | ||
| doc | ||
| include | ||
| libsupc++ | ||
| po | ||
| python | ||
| scripts | ||
| src | ||
| testsuite | ||
| acinclude.m4 | ||
| aclocal.m4 | ||
| ChangeLog | ||
| ChangeLog-1998 | ||
| ChangeLog-1999 | ||
| ChangeLog-2000 | ||
| ChangeLog-2001 | ||
| ChangeLog-2002 | ||
| ChangeLog-2003 | ||
| ChangeLog-2004 | ||
| ChangeLog-2005 | ||
| ChangeLog-2006 | ||
| ChangeLog-2007 | ||
| ChangeLog-2008 | ||
| ChangeLog-2009 | ||
| ChangeLog-2010 | ||
| ChangeLog-2011 | ||
| ChangeLog-2012 | ||
| ChangeLog-2013 | ||
| ChangeLog-2014 | ||
| ChangeLog-2015 | ||
| ChangeLog-2016 | ||
| ChangeLog-2017 | ||
| ChangeLog-2018 | ||
| ChangeLog-2019 | ||
| config.h.in | ||
| configure | ||
| configure.ac | ||
| configure.host | ||
| crossconfig.m4 | ||
| fragment.am | ||
| linkage.m4 | ||
| Makefile.am | ||
| Makefile.in | ||
| README | ||
file: libstdc++-v3/README New users may wish to point their web browsers to the file index.html in the 'doc/html' subdirectory. It contains brief building instructions and notes on how to configure the library in interesting ways.