Thread.c

Go to the documentation of this file.

/*
 * Objectively: Ultra-lightweight object oriented framework for GNU C.
 * Copyright (C) 2014 Jay Dolan <jay@jaydolan.com>
 *
 * This software is provided 'as-is', without any express or implied
 * warranty. In no event will the authors be held liable for any damages
 * arising from the use of this software.
 *
 * Permission is granted to anyone to use this software for any purpose,
 * including commercial applications, and to alter it and redistribute it
 * freely, subject to the following restrictions:
 *
 * 1. The origin of this software must not be misrepresented; you must not
 * claim that you wrote the original software. If you use this software
 * in a product, an acknowledgment in the product documentation would be
 * appreciated but is not required.
 *
 * 2. Altered source versions must be plainly marked as such, and must not be
 * misrepresented as being the original software.
 *
 * 3. This notice may not be removed or altered from any source distribution.
 */
 
#include <assert.h>
#include <errno.h>
#include <signal.h>
#include <stdlib.h>
 
#include <pthread.h>
 
#include "Thread.h"
 
#define _Class _Thread
 
#pragma mark - Object
 
static Object *copy(const Object *self) {
    return NULL;
}
 
static void dealloc(Object *self) {
 
    Thread *this = (Thread *) self;
 
    assert(this->isExecuting == false);
 
    free(this->thread);
 
    super(Object, self, dealloc);
}
 
#pragma mark - Thread
 
static void cancel(Thread *self) {
 
    assert(self->isCancelled == false);
 
    // int err = pthread_cancel(*((pthread_t *) self->thread));
    // assert(err == 0);
 
    self->isCancelled = true;
}
 
static __thread Thread *_currentThread;
 
static Thread *currentThread(void) {
 
    return _currentThread;
}
 
static void detach(Thread *self) {
 
    assert(self->isDetached == false);
 
    int err = pthread_detach(*((pthread_t *) self->thread));
    assert(err == 0);
 
    self->isDetached = true;
}
 
static Thread *init(Thread *self) {
 
    return $(self, initWithFunction, NULL, NULL);
}
 
static Thread *initWithFunction(Thread *self, ThreadFunction function, ident data) {
 
    self = (Thread *) super(Object, self, init);
    if (self) {
        self->function = function;
        self->data = data;
 
        self->thread = calloc(1, sizeof(pthread_t));
        assert(self->thread);
    }
 
    return self;
}
 
static void join(Thread *self, ident *status) {
 
    int err = pthread_join(*((pthread_t *) self->thread), status);
    assert(err == 0);
}
 
static void _kill(Thread *self, int signal) {
 
    int err = pthread_kill(*((pthread_t *) self->thread), signal);
    assert(err == 0);
}
 
static ident run(ident obj) {
 
    Thread *self = _currentThread = (Thread *) obj;
 
    self->isExecuting = true;
 
    ident ret = self->function(self);
 
    self->isFinished = true;
 
    self->isExecuting = false;
 
    return ret;
}
 
static void start(Thread *self) {
 
    assert(self->function);
 
    assert(self->isCancelled == false);
    assert(self->isDetached == false);
    assert(self->isExecuting == false);
    assert(self->isFinished == false);
 
    int err = pthread_create(self->thread, NULL, run, self);
    assert(err == 0);
}
 
#pragma mark - Class lifecycle
 
static void initialize(Class *clazz) {
 
    ((ObjectInterface *) clazz->interface)->copy = copy;
    ((ObjectInterface *) clazz->interface)->dealloc = dealloc;
 
    ((ThreadInterface *) clazz->interface)->cancel = cancel;
    ((ThreadInterface *) clazz->interface)->currentThread = currentThread;
    ((ThreadInterface *) clazz->interface)->detach = detach;
    ((ThreadInterface *) clazz->interface)->init = init;
    ((ThreadInterface *) clazz->interface)->initWithFunction = initWithFunction;
    ((ThreadInterface *) clazz->interface)->join = join;
    ((ThreadInterface *) clazz->interface)->kill = _kill;
    ((ThreadInterface *) clazz->interface)->start = start;
}
 
Class *_Thread(void) {
    static Class *clazz;
    static Once once;
 
    do_once(&once, {
        clazz = _initialize(&(const ClassDef) {
            .name = "Thread",
            .superclass = _Object(),
            .instanceSize = sizeof(Thread),
            .interfaceOffset = offsetof(Thread, interface),
            .interfaceSize = sizeof(ThreadInterface),
            .initialize = initialize,
        });
    });
 
    return clazz;
}
 
#undef _Class