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Filename : swoole_lock.h
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/*
  +----------------------------------------------------------------------+
  | Swoole                                                               |
  +----------------------------------------------------------------------+
  | This source file is subject to version 2.0 of the Apache license,    |
  | that is bundled with this package in the file LICENSE, and is        |
  | available through the world-wide-web at the following url:           |
  | http://www.apache.org/licenses/LICENSE-2.0.html                      |
  | If you did not receive a copy of the Apache2.0 license and are unable|
  | to obtain it through the world-wide-web, please send a note to       |
  | license@swoole.com so we can mail you a copy immediately.            |
  +----------------------------------------------------------------------+
  | Author: Tianfeng Han  <rango@swoole.com>                             |
  |         Twosee  <twose@qq.com>                                       |
  +----------------------------------------------------------------------+
*/

#pragma once

#include "swoole_memory.h"

#include <sys/file.h>
#include <system_error>

namespace swoole {

class Lock {
  public:
    enum Type {
        RW_LOCK = 1,
        MUTEX = 3,
        SPIN_LOCK = 5,
        COROUTINE_LOCK = 6,
    };
    Type get_type() const {
        return type_;
    }
    virtual ~Lock() = default;
    virtual int lock(int operation = LOCK_EX, int timeout_msec = -1) = 0;
    virtual int unlock() = 0;

  protected:
    Lock(Type type, bool shared) {
        type_ = type;
        shared_ = shared;
    }
    Type type_;
    bool shared_;
};

struct MutexImpl;

class Mutex final : public Lock {
    MutexImpl *impl;

  public:
    explicit Mutex(bool shared);
    ~Mutex() override;
    int lock(int operation = LOCK_EX, int timeout_msec = -1) override;
    int unlock() override;
};

#ifdef HAVE_RWLOCK
struct RWLockImpl;

class RWLock final : public Lock {
    RWLockImpl *impl;

  public:
    explicit RWLock(bool shared);
    ~RWLock() override;
    int lock(int operation = LOCK_EX, int timeout_msec = -1) override;
    int unlock() override;
    int lock_rd() {
    	return lock(LOCK_SH);
    }
    int lock_wr() {
    	return lock(LOCK_EX);
    }
};
#endif

#ifdef HAVE_SPINLOCK
class SpinLock final : public Lock {
    pthread_spinlock_t *impl;

  public:
    explicit SpinLock(bool shared);
    ~SpinLock() override;
    int lock(int operation = LOCK_EX, int timeout_msec = -1) override;
    int unlock() override;
};
#endif

class CoroutineLock final : public Lock {
    long cid = 0;
    sw_atomic_t *value = nullptr;
    void *coroutine = nullptr;

    int lock_impl(bool blocking = true);

  public:
    explicit CoroutineLock(bool shared);
    ~CoroutineLock() override;
    int lock(int operation = LOCK_EX, int timeout_msec = -1) override;
    int unlock() override;
};

#if defined(HAVE_PTHREAD_BARRIER) && !(defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__NetBSD__))
#define SW_USE_PTHREAD_BARRIER
#endif

struct Barrier {
#ifdef SW_USE_PTHREAD_BARRIER
    pthread_barrier_t barrier_;
    pthread_barrierattr_t barrier_attr_;
    bool shared_;
#else
    sw_atomic_t count_;
    sw_atomic_t barrier_;
#endif
    void init(bool shared, int count);
    void wait();
    void destroy();
};

}  // namespace swoole