ladybird/Userland/Libraries/LibThreading/Mutex.h
Ben Wiederhake 6fd478b6ce Everywhere: Remove unused includes of AK/Format.h
These instances were detected by searching for files that include
AK/Format.h, but don't match the regex:

\\b(CheckedFormatString|critical_dmesgln|dbgln|dbgln_if|dmesgln|FormatBu
ilder|__FormatIfSupported|FormatIfSupported|FormatParser|FormatString|Fo
rmattable|Formatter|__format_value|HasFormatter|max_format_arguments|out
|outln|set_debug_enabled|StandardFormatter|TypeErasedFormatParams|TypeEr
asedParameter|VariadicFormatParams|v_critical_dmesgln|vdbgln|vdmesgln|vf
ormat|vout|warn|warnln|warnln_if)\\b

(Without the linebreaks.)

This regex is pessimistic, so there might be more files that don't
actually use any formatting functions.

Observe that this revealed that Userland/Libraries/LibC/signal.cpp is
missing an include.

In theory, one might use LibCPP to detect things like this
automatically, but let's do this one step after another.
2023-01-02 20:27:20 -05:00

89 lines
1.9 KiB
C++

/*
* Copyright (c) 2018-2021, Andreas Kling <kling@serenityos.org>
* Copyright (c) 2021, kleines Filmröllchen <malu.bertsch@gmail.com>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/Assertions.h>
#include <AK/Noncopyable.h>
#include <AK/Types.h>
#include <pthread.h>
namespace Threading {
class Mutex {
AK_MAKE_NONCOPYABLE(Mutex);
AK_MAKE_NONMOVABLE(Mutex);
friend class ConditionVariable;
public:
Mutex()
: m_lock_count(0)
{
#ifndef AK_OS_SERENITY
pthread_mutexattr_t attr;
pthread_mutexattr_init(&attr);
pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);
pthread_mutex_init(&m_mutex, &attr);
#endif
}
~Mutex()
{
VERIFY(m_lock_count == 0);
// FIXME: pthread_mutex_destroy() is not implemented.
}
void lock();
void unlock();
private:
#ifdef AK_OS_SERENITY
pthread_mutex_t m_mutex = PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP;
#else
pthread_mutex_t m_mutex;
#endif
unsigned m_lock_count { 0 };
};
class MutexLocker {
AK_MAKE_NONCOPYABLE(MutexLocker);
AK_MAKE_NONMOVABLE(MutexLocker);
public:
ALWAYS_INLINE explicit MutexLocker(Mutex& mutex)
: m_mutex(mutex)
{
lock();
}
ALWAYS_INLINE ~MutexLocker()
{
unlock();
}
ALWAYS_INLINE void unlock() { m_mutex.unlock(); }
ALWAYS_INLINE void lock() { m_mutex.lock(); }
private:
Mutex& m_mutex;
};
ALWAYS_INLINE void Mutex::lock()
{
pthread_mutex_lock(&m_mutex);
m_lock_count++;
}
ALWAYS_INLINE void Mutex::unlock()
{
VERIFY(m_lock_count > 0);
// FIXME: We need to protect the lock count with the mutex itself.
// This may be bad because we're not *technically* unlocked yet,
// but we're not handling any errors from pthread_mutex_unlock anyways.
m_lock_count--;
pthread_mutex_unlock(&m_mutex);
}
}