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/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* Monkey HTTP Server
* ==================
* Copyright 2001-2016 Monkey Software LLC <eduardo@monkey.io>
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef MK_THREAD_LIBCO_H
#define MK_THREAD_LIBCO_H
#include <monkey/mk_info.h>
#include <monkey/mk_core.h>
#include <libco.h>
#include <limits.h>
#ifdef MK_HAVE_VALGRIND
#include <valgrind/valgrind.h>
#endif
#include <monkey/mk_tls.h>
struct mk_thread {
#ifdef MK_HAVE_VALGRIND
unsigned int valgrind_stack_id;
#endif
/* libco 'contexts' */
cothread_t caller;
cothread_t callee;
void *data;
/*
* Callback invoked before the thread is destroyed. Used to release
* any pending info in MK_THREAD_DATA(...).
*/
void (*cb_destroy) (void *);
};
#define MK_THREAD_STACK_SIZE ((3 * PTHREAD_STACK_MIN) / 2)
#define MK_THREAD_DATA(th) (((char *) th) + sizeof(struct mk_thread))
extern MK_EXPORT MK_TLS_DEFINE(struct mk_thread, mk_thread);
static MK_INLINE void mk_thread_yield(struct mk_thread *th)
{
co_switch(th->caller);
}
static MK_INLINE void mk_thread_destroy(struct mk_thread *th)
{
if (th->cb_destroy) {
th->cb_destroy(MK_THREAD_DATA(th));
}
MK_TRACE("[thread] destroy thread=%p data=%p", th, MK_THREAD_DATA(th));
#ifdef MK_HAVE_VALGRIND
VALGRIND_STACK_DEREGISTER(th->valgrind_stack_id);
#endif
co_delete(th->callee);
mk_mem_free(th);
}
#define mk_thread_return(th) co_switch(th->caller)
static MK_INLINE void mk_thread_resume(struct mk_thread *th)
{
MK_TLS_SET(mk_thread, th);
/*
* In the past we used to have a flag to mark when a coroutine
* has finished (th->ended == MK_TRUE), now we let the coroutine
* to submit an event to the event loop indicating what's going on
* through the call MK_OUTPUT_RETURN(...).
*
* So we just swap context and let the event loop to handle all
* the cleanup required.
*/
th->caller = co_active();
co_switch(th->callee);
}
static MK_INLINE struct mk_thread *mk_thread_new(size_t data_size,
void (*cb_destroy) (void *))
{
void *p;
struct mk_thread *th;
/* Create a thread context and initialize */
p = mk_mem_alloc(sizeof(struct mk_thread) + data_size);
if (!p) {
return NULL;
}
th = (struct mk_thread *) p;
th->cb_destroy = cb_destroy;
MK_TRACE("[thread %p] created (custom data at %p, size=%lu",
th, MK_THREAD_DATA(th), data_size);
return th;
}
#endif
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