brian/Cardinal
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

Forget about our custom mutex altogether after all

Browse source 
Signed-off-by: falkTX <falktx@falktx.com>
This commit is contained in:
falkTX 2022-02-11 05:21:49 +00:00
parent 57dce2e631
commit 78485054bd
No known key found for this signature in database
GPG key ID: CDBAA37ABC74FBA0
1 changed files with 0 additions and 86 deletions
Download patch file Download diff file Expand all files Collapse all files

86
include/mutex.hpp
View file

@ -1,86 +0,0 @@
/*
* DISTRHO Cardinal Plugin
* Copyright (C) 2021-2022 Filipe Coelho <falktx@falktx.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 3 of
* the License, or any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* For a full copy of the GNU General Public License see the LICENSE file.
*/
#pragma once
#include <pthread.h>
/* replace Rack's mutex with our own custom one, which can do priority inversion. */
namespace rack {
struct SharedMutex {
pthread_mutex_t readLock;
pthread_mutex_t writeLock;
SharedMutex() noexcept {
pthread_mutexattr_t attr;
pthread_mutexattr_init(&attr);
pthread_mutexattr_setprotocol(&attr, PTHREAD_PRIO_INHERIT);
pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);
pthread_mutex_init(&readLock, &attr);
pthread_mutexattr_destroy(&attr);
pthread_mutexattr_t attr2;
pthread_mutexattr_init(&attr2);
pthread_mutexattr_setprotocol(&attr2, PTHREAD_PRIO_NONE);
pthread_mutexattr_settype(&attr2, PTHREAD_MUTEX_NORMAL);
pthread_mutex_init(&writeLock, &attr2);
pthread_mutexattr_destroy(&attr2);
}
~SharedMutex() noexcept {
pthread_mutex_destroy(&readLock);
pthread_mutex_destroy(&writeLock);
}
// for std::lock_guard usage, writers lock
void lock() noexcept {
pthread_mutex_lock(&readLock);
pthread_mutex_lock(&writeLock);
}
void unlock() noexcept {
pthread_mutex_unlock(&writeLock);
pthread_mutex_unlock(&readLock);
}
// for SharedLock usage, readers lock
void lock_shared() noexcept {
pthread_mutex_lock(&readLock);
}
void unlock_shared() noexcept {
pthread_mutex_unlock(&readLock);
}
};
template <class Mutex>
struct SharedLock {
Mutex& mutex;
SharedLock(Mutex& m) noexcept : mutex(m) {
mutex.lock_shared();
}
~SharedLock() noexcept {
mutex.unlock_shared();
}
};
} // namespace rack