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# std::shared_lock::lock

From cppreference.com
< cpp‎ | thread‎ | shared lock

void lock(); |  | (since C++14)

Locks the associated mutex. Effectively calls mutex()->lock_shared().

std::system_error is thrown if there is no associated mutex or if the mutex is already locked.

### [edit] Parameters

(none)

### [edit] Return value

(none)

### [edit] Exceptions

- Any exceptions thrown by mutex()->lock_shared()

- If there is no associated mutex, std::system_error with an error code of std::errc::operation_not_permitted

- If the mutex is already locked, std::system_error with an error code of std::errc::resource_deadlock_would_occur

### [edit] Example

| This section is incomplete Reason: no example

### [edit] See also

try_lock | tries to lock the associated mutex (public member function) [edit]
unlock | unlocks the associated mutex (public member function) [edit]

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