Acquire locks for multiple Synchronized<T> objects, in a deadlock‐safe manner.
Synopsis
Declared in <folly/Synchronized.h>
template<
class Sync1,
class Sync2>
std::tuple</* implementation-defined */, /* implementation-defined */>
acquireLocked(
Sync1& l1,
Sync2& l2);Description
The locks are acquired in order from lowest address to highest address. (Note that this is not necessarily the same algorithm used by std::lock().) For parameters that are const and support shared locks, a read lock is acquired. Otherwise an exclusive lock is acquired.
use lock() with folly::wlock(), folly::rlock() and folly::ulock() for arbitrary locking without causing a deadlock (as much as possible), with the same effects as std::lock()
Return Value
A tuple of locked pointers, one per object.
Parameters
Name |
Description |
l1 |
The first object to lock. |
l2 |
The second object to lock. |
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