source: src/libcfa/concurrency/mutex@ 93c2e0a

//                              -*- Mode: CFA -*-
//
// Cforall Version 1.0.0 Copyright (C) 2016 University of Waterloo
//
// The contents of this file are covered under the licence agreement in the
// file "LICENCE" distributed with Cforall.
//
// mutex --
//
// Author           : Thierry Delisle
// Created On       : Fri May 25 01:24:09 2018
// Last Modified By : Thierry Delisle
// Last Modified On : Fri May 25 01:24:12 2018
// Update Count     : 0
//

#pragma once

#include <stdbool.h>

#include "bits/algorithms.h"
#include "bits/locks.h"

#include "invoke.h"
#include "time_t.h"

//-----------------------------------------------------------------------------
// Locks

// Exclusive lock - non-recursive
// ---
struct mutex_lock {
        // Spin lock used for mutual exclusion
        __spinlock_t lock;

        // List of blocked threads
        __queue_t(struct thread_desc) blocked_threads;

        // Locked flag
        bool is_locked;
};

void ?{}(mutex_lock & this);
void ^?{}(mutex_lock & this);
void lock(mutex_lock & this);
bool try_lock(mutex_lock & this);
void unlock(mutex_lock & this);

// Exclusive lock - recursive
// ---
struct recursive_mutex_lock{
        // Spin lock used for mutual exclusion
        __spinlock_t lock;

        // List of blocked threads
        __queue_t(struct thread_desc) blocked_threads;

        // Current thread owning the lock
        struct thread_desc * owner;

        // Number of recursion level
        size_t recursion_count;
};

void ?{}(recursive_mutex_lock & this);
void ^?{}(recursive_mutex_lock & this);
void lock(recursive_mutex_lock & this);
bool try_lock(recursive_mutex_lock & this);
void unlock(recursive_mutex_lock & this);

trait is_lock(dtype L | sized(L)) {
        void lock  (L &);
        void unlock(L &);
};

//-----------------------------------------------------------------------------
// Condition variables

struct condition_variable {
        // Spin lock used for mutual exclusion
        __spinlock_t lock;

        // List of blocked threads
        __queue_t(struct thread_desc) blocked_threads;
};

void ?{}(condition_variable & this);
void ^?{}(condition_variable & this);

void notify_one(condition_variable & this);
void notify_all(condition_variable & this);

void wait(condition_variable & this);

forall(dtype L | is_lock(L))
void wait(condition_variable & this, L & l);

//-----------------------------------------------------------------------------
// Scopes
forall(dtype L | is_lock(L)) {
        #if !defined( __TUPLE_ARRAYS_EXIST__ )
        void lock  ( L * locks [], size_t count);
        void unlock( L * locks [], size_t count);

        struct lock_scope {
                L **   locks;
                size_t count;
        };

        static inline void ?{}(lock_scope(L) & this) {
                this.locks = NULL;
                this.count = 0;
        }

        static inline void ^?{}(lock_scope(L) & this) {
                if(this.count > 0) {
                        unlock(this.locks, this.count);
                }
        }

        static inline lock_scope(L) lock( L * locks [], size_t count, lock_scope(L) & scope) {
                lock(locks, count);
                scope.locks = locks;
                scope.count = count;
        }

        static inline void unlock( lock_scope(L) & this ) {
                unlock(this.locks, this.count);
                this.count = 0;
        }

        static inline void release( lock_scope(L) & this ) {
                this.count = 0;
        }
        #else
        void lock( [L &...] locks );
        void unlock( [L &...] locks );

        forall(size_t N)
        struct lock_scope {
                bool released;
                [L &... N] locks;
        };

        void ?{}(lock_scope(L) & this) = void;
        void ?{}(lock_scope(L) & this, lock_scope(L) other) = void;
        void ?move?(lock_scope(L) & this, lock_scope(L) & other) = default;

        static inline void ^?{}(lock_scope(L) & this) {
                if( !this.released ) {
                        unlock(this.locks);
                }
        }

        forall(size_t N)
        static inline lock_scope(L, N) lock( [L &...] locks ) {
                lock(locks);
                return @{false, locks};
        }

        static inline void unlock( lock_scope(L) & this ) {
                unlock(this.locks);
                this.released = true
        }

        static inline void release( lock_scope(L) & this ) {
                this.released = true;
        }
        #endif
}