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# nng_mtx_unlock(3supp)
## NAME
nng_mtx_unlock --- unlock mutex
## SYNOPSIS
```c
#include <nng/nng.h>
#include <nng/supplemental/util/platform.h>
void nng_mtx_unlock(nng_mtx *mtx);
```
## DESCRIPTION
The `nng_mtx_unlock()` relinquishes ownership of the mutex _mtx_ that
was previously acquired via [`nng_mtx_lock()`][nng_mtx_lock].
> [!NOTE]
> A mutex can _only_ be unlocked by the thread that locked it.
> Attempting to unlock a mutex that is not owned by the caller will result
> in undefined behavior.
## SEE ALSO
[nng_mtx_alloc](nng_mtx_alloc),
[nng_mtx_lock](nng_mtx_lock)
{{#include ../refs.md}}
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