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## 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 xref:nng_mtx_lock.adoc[`nng_mtx_lock`].
IMPORTANT: 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
xref:nng_mtx_alloc.adoc[nng_mtx_alloc],
xref:nng_mtx_lock.adoc[nng_mtx_lock]
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