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authorRich Felker <dalias@aerifal.cx>2017-08-11 20:42:30 -0400
committerRich Felker <dalias@aerifal.cx>2017-08-11 20:42:30 -0400
commit80bf5952551c002cf12d96deb145629765272db0 (patch)
treecd5d18ba17103d6b979e521d00dc86d79d0cb749 /arch/sh/atomic_arch.h
parente31c8c2d796e8a9596503f079dc567c45f93c2ae (diff)
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trap UB from attempts to join a detached thread
passing to pthread_join the id of a thread which is not joinable
results in undefined behavior.

in principle the check to trap does not necessarily work if
pthread_detach was called after thread creation, since no effort is
made here to synchronize access to t->detached, but the check is
well-defined and harmless for callers which did not invoke UB, and
likely to help catch erroneous code that would otherwise mysteriously
hang.

patch by William Pitcock.
Diffstat (limited to 'arch/sh/atomic_arch.h')
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