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# cnd_signal

From cppreference.com
< c‎ | thread

Defined in header `<threads.h>` |  |
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`.

### [edit] Parameters

cond | - | pointer to a condition variable

### [edit] Return value

thrd_success if successful, thrd_error otherwise.

### [edit] References

- C11 standard (ISO/IEC 9899:2011):

  - 7.26.3.4 The cnd_signal function (p: 379)

### [edit] See also

cnd_broadcast (C11) | unblocks all threads blocked on a condition variable (function) [edit]
C++ documentation for notify_one

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