pthread_cond_destroy - destroy a condition variable
The pthread_cond_destroy() function frees the resources allocated by the
condition variable cond.
If successful, the pthread_cond_destroy() function will return zero, otherwise
an error number will be returned to indicate the error.
pthread_cond_destroy() will fail if:
[EINVAL] The value specified by cond is invalid.
[EBUSY] The variable cond is locked by another thread.
pthread_cond_destroy() conforms to ISO/IEC 9945-1:1996
OpenBSD 3.6 July 28, 1998
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