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/*
* %CopyrightBegin%
*
* Copyright Ericsson AB 2006-2012. All Rights Reserved.
*
* The contents of this file are subject to the Erlang Public License,
* Version 1.1, (the "License"); you may not use this file except in
* compliance with the License. You should have received a copy of the
* Erlang Public License along with this software. If not, it can be
* retrieved online at http://www.erlang.org/.
*
* Software distributed under the License is distributed on an "AS IS"
* basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
* the License for the specific language governing rights and limitations
* under the License.
*
* %CopyrightEnd%
*/
/*
* Description: Scheduling of port tasks
*
* Author: Rickard Green
*/
#ifndef ERTS_PORT_TASK_H_BASIC_TYPES__
#define ERTS_PORT_TASK_H_BASIC_TYPES__
#include "erl_sys_driver.h"
#include "erl_smp.h"
typedef erts_smp_atomic_t ErtsPortTaskHandle;
#endif
#ifndef ERTS_PORT_TASK_ONLY_BASIC_TYPES__
#ifndef ERL_PORT_TASK_H__
#define ERL_PORT_TASK_H__
#undef ERTS_INCLUDE_SCHEDULER_INTERNALS
#if (defined(ERL_PROCESS_C__) \
|| defined(ERL_PORT_TASK_C__) \
|| defined(ERL_IO_C__) \
|| (ERTS_GLB_INLINE_INCL_FUNC_DEF \
&& defined(ERTS_DO_INCL_GLB_INLINE_FUNC_DEF)))
#define ERTS_INCLUDE_SCHEDULER_INTERNALS
#endif
typedef enum {
ERTS_PORT_TASK_INPUT,
ERTS_PORT_TASK_OUTPUT,
ERTS_PORT_TASK_EVENT,
ERTS_PORT_TASK_TIMEOUT,
ERTS_PORT_TASK_DIST_CMD
} ErtsPortTaskType;
#ifdef ERTS_INCLUDE_SCHEDULER_INTERNALS
/* NOTE: Do not access any of the exported variables directly */
extern erts_smp_atomic_t erts_port_task_outstanding_io_tasks;
#endif
#define ERTS_PTS_FLG_IN_RUNQ (((erts_aint32_t) 1) << 0)
#define ERTS_PTS_FLG_EXEC (((erts_aint32_t) 1) << 1)
#define ERTS_PTS_FLG_HAVE_TASKS (((erts_aint32_t) 1) << 2)
#define ERTS_PTS_FLG_EXIT (((erts_aint32_t) 1) << 3)
typedef struct ErtsPortTask_ ErtsPortTask;
typedef struct {
Port *next;
struct {
ErtsPortTask *local;
struct {
ErtsPortTask *first;
ErtsPortTask *last;
} in;
} taskq;
erts_smp_atomic32_t flags;
#ifdef ERTS_SMP
erts_mtx_t mtx;
#endif
} ErtsPortTaskSched;
ERTS_GLB_INLINE void erts_port_task_handle_init(ErtsPortTaskHandle *pthp);
ERTS_GLB_INLINE int erts_port_task_is_scheduled(ErtsPortTaskHandle *pthp);
ERTS_GLB_INLINE void erts_port_task_init_sched(ErtsPortTaskSched *ptsp,
Eterm id);
ERTS_GLB_INLINE void erts_port_task_fini_sched(ErtsPortTaskSched *ptsp);
ERTS_GLB_INLINE void erts_port_task_sched_lock(ErtsPortTaskSched *ptsp);
ERTS_GLB_INLINE void erts_port_task_sched_unlock(ErtsPortTaskSched *ptsp);
#ifdef ERTS_INCLUDE_SCHEDULER_INTERNALS
ERTS_GLB_INLINE int erts_port_task_have_outstanding_io_tasks(void);
#endif
#if ERTS_GLB_INLINE_INCL_FUNC_DEF
ERTS_GLB_INLINE void
erts_port_task_handle_init(ErtsPortTaskHandle *pthp)
{
erts_smp_atomic_init_nob(pthp, (erts_aint_t) NULL);
}
ERTS_GLB_INLINE int
erts_port_task_is_scheduled(ErtsPortTaskHandle *pthp)
{
return ((void *) erts_smp_atomic_read_nob(pthp)) != NULL;
}
ERTS_GLB_INLINE void
erts_port_task_init_sched(ErtsPortTaskSched *ptsp, Eterm instr_id)
{
ptsp->next = NULL;
ptsp->taskq.local = NULL;
ptsp->taskq.in.first = NULL;
ptsp->taskq.in.last = NULL;
erts_smp_atomic32_init_nob(&ptsp->flags, 0);
#ifdef ERTS_SMP
erts_mtx_init_x(&ptsp->mtx, "port_sched_lock", instr_id);
#endif
}
ERTS_GLB_INLINE void
erts_port_task_sched_lock(ErtsPortTaskSched *ptsp)
{
#ifdef ERTS_SMP
erts_mtx_lock(&ptsp->mtx);
#endif
}
ERTS_GLB_INLINE void
erts_port_task_sched_unlock(ErtsPortTaskSched *ptsp)
{
#ifdef ERTS_SMP
erts_mtx_unlock(&ptsp->mtx);
#endif
}
ERTS_GLB_INLINE void
erts_port_task_fini_sched(ErtsPortTaskSched *ptsp)
{
#ifdef ERTS_SMP
erts_mtx_destroy(&ptsp->mtx);
#endif
}
#ifdef ERTS_INCLUDE_SCHEDULER_INTERNALS
ERTS_GLB_INLINE int
erts_port_task_have_outstanding_io_tasks(void)
{
return (erts_smp_atomic_read_acqb(&erts_port_task_outstanding_io_tasks)
!= 0);
}
#endif /* ERTS_INCLUDE_SCHEDULER_INTERNALS */
#endif
#ifdef ERTS_INCLUDE_SCHEDULER_INTERNALS
int erts_port_task_execute(ErtsRunQueue *, Port **);
void erts_port_task_init(void);
#endif
int erts_port_task_abort(ErtsPortTaskHandle *);
int erts_port_task_schedule(Eterm,
ErtsPortTaskHandle *,
ErtsPortTaskType,
...);
void erts_port_task_free_port(Port *);
int erts_port_is_scheduled(Port *);
#ifdef ERTS_SMP
void erts_enqueue_port(ErtsRunQueue *rq, Port *pp);
Port *erts_dequeue_port(ErtsRunQueue *rq);
#endif
#undef ERTS_INCLUDE_SCHEDULER_INTERNALS
#endif /* ERL_PORT_TASK_H__ */
#endif /* ERTS_PORT_TASK_ONLY_BASIC_TYPES__ */
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