Defined in header <threads.h>  |  ||
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 int cnd_signal( cnd_t *cond );  |  (since C11) | 
Unblocks one thread that currently waits on condition variable pointed to by cond. If no threads are blocked, does nothing and returns thrd_success.
| cond | - | pointer to a condition variable | 
thrd_success if successful, thrd_error otherwise.
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 (C11)   |   unblocks all threads blocked on a condition variable  (function)  | 
 C++ documentation for condition_variable::notify_one  | 
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 C++ documentation for condition_variable_any::notify_one  | 
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