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// Copyright 2019, The Tari Project // // Redistribution and use in source and binary forms, with or without modification, are permitted provided that the // following conditions are met: // // 1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following // disclaimer. // // 2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the // following disclaimer in the documentation and/or other materials provided with the distribution. // // 3. Neither the name of the copyright holder nor the names of its contributors may be used to endorse or promote // products derived from this software without specific prior written permission. // // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, // INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE // DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR // SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, // WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE // USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. /// Recovers a poisoned lock by returning the value before the lock was poisoned #[macro_export] macro_rules! recover_lock { ($e:expr) => { match $e { Ok(lock) => lock, Err(poisoned) => { log::warn!(target: "tari_util", "Lock has been POISONED and will be silently recovered"); poisoned.into_inner() }, } }; } /// This macro unlocks a Mutex or RwLock. If the lock is poisoned (i.e. a panic before a MutexGuard / RwLockGuard is /// dropped) the last value before the panic occurred is used. /// /// This macro should not be used if the implementation should fail a if the lock was poisoned. #[macro_export] macro_rules! acquire_lock { ($e:expr, $m:ident) => { $crate::recover_lock!($e.$m()) }; ($e:expr) => { $crate::acquire_lock!($e, lock) }; } /// Acquire a write lock on a RwLock, silently recovering the lock if it is poisoned #[macro_export] macro_rules! acquire_write_lock { ($e:expr) => { $crate::acquire_lock!($e, write) }; } /// Acquire a read lock on a RwLock, silently recovering the lock if it is poisoned #[macro_export] macro_rules! acquire_read_lock { ($e:expr) => { $crate::acquire_lock!($e, read) }; }