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/*
* %CopyrightBegin%
*
* Copyright Ericsson AB 2006-2013. All Rights Reserved.
*
* 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.
*
* %CopyrightEnd%
*/
/*
* Description: Poll interface suitable for ERTS with or without
* SMP support.
*
* Author: Rickard Green
*/
#ifndef ERL_POLL_H__
#define ERL_POLL_H__
#include "sys.h"
#define ERTS_POLL_NO_TIMEOUT ERTS_MONOTONIC_TIME_MIN
#if 0
#define ERTS_POLL_COUNT_AVOIDED_WAKEUPS
#endif
#ifdef ERTS_ENABLE_KERNEL_POLL
# if defined(ERTS_KERNEL_POLL_VERSION)
# define ERTS_POLL_EXPORT(FUNC) FUNC ## _kp
# else
# define ERTS_POLL_EXPORT(FUNC) FUNC ## _nkp
# undef ERTS_POLL_DISABLE_KERNEL_POLL
# define ERTS_POLL_DISABLE_KERNEL_POLL
# endif
#else
# define ERTS_POLL_EXPORT(FUNC) FUNC
# undef ERTS_POLL_DISABLE_KERNEL_POLL
# define ERTS_POLL_DISABLE_KERNEL_POLL
#endif
#ifdef ERTS_POLL_DISABLE_KERNEL_POLL
# undef HAVE_SYS_EPOLL_H
# undef HAVE_SYS_EVENT_H
# undef HAVE_SYS_DEVPOLL_H
#endif
#undef ERTS_POLL_USE_KERNEL_POLL
#define ERTS_POLL_USE_KERNEL_POLL 0
#undef ERTS_POLL_USE_KQUEUE
#define ERTS_POLL_USE_KQUEUE 0
#undef ERTS_POLL_USE_EPOLL
#define ERTS_POLL_USE_EPOLL 0
#undef ERTS_POLL_USE_DEVPOLL
#define ERTS_POLL_USE_DEVPOLL 0
#undef ERTS_POLL_USE_POLL
#define ERTS_POLL_USE_POLL 0
#undef ERTS_POLL_USE_SELECT
#define ERTS_POLL_USE_SELECT 0
#if defined(HAVE_SYS_EVENT_H)
# undef ERTS_POLL_USE_KQUEUE
# define ERTS_POLL_USE_KQUEUE 1
# undef ERTS_POLL_USE_KERNEL_POLL
# define ERTS_POLL_USE_KERNEL_POLL 1
#elif defined(HAVE_SYS_EPOLL_H)
# undef ERTS_POLL_USE_EPOLL
# define ERTS_POLL_USE_EPOLL 1
# undef ERTS_POLL_USE_KERNEL_POLL
# define ERTS_POLL_USE_KERNEL_POLL 1
#elif defined(HAVE_SYS_DEVPOLL_H)
# undef ERTS_POLL_USE_DEVPOLL
# define ERTS_POLL_USE_DEVPOLL 1
# undef ERTS_POLL_USE_KERNEL_POLL
# define ERTS_POLL_USE_KERNEL_POLL 1
#endif
#define ERTS_POLL_USE_FALLBACK (ERTS_POLL_USE_KQUEUE || ERTS_POLL_USE_EPOLL)
#if !ERTS_POLL_USE_KERNEL_POLL || ERTS_POLL_USE_FALLBACK
# if defined(ERTS_USE_POLL)
# undef ERTS_POLL_USE_POLL
# define ERTS_POLL_USE_POLL 1
# elif !defined(__WIN32__)
# undef ERTS_POLL_USE_SELECT
# define ERTS_POLL_USE_SELECT 1
# endif
#endif
#define ERTS_POLL_USE_TIMERFD 0
typedef Uint32 ErtsPollEvents;
#undef ERTS_POLL_EV_E2N
#if defined(__WIN32__) /* --- win32 --------------------------------------- */
#define ERTS_POLL_EV_IN 1
#define ERTS_POLL_EV_OUT 2
#define ERTS_POLL_EV_ERR 4
#define ERTS_POLL_EV_NVAL 8
#elif ERTS_POLL_USE_EPOLL /* --- epoll ------------------------------- */
#include <sys/epoll.h>
#ifdef HAVE_SYS_TIMERFD_H
#include <sys/timerfd.h>
#undef ERTS_POLL_USE_TIMERFD
#define ERTS_POLL_USE_TIMERFD 1
#endif
#define ERTS_POLL_EV_E2N(EV) \
((__uint32_t) (EV))
#define ERTS_POLL_EV_N2E(EV) \
((ErtsPollEvents) (EV))
#define ERTS_POLL_EV_IN ERTS_POLL_EV_N2E(EPOLLIN)
#define ERTS_POLL_EV_OUT ERTS_POLL_EV_N2E(EPOLLOUT)
#define ERTS_POLL_EV_NVAL ERTS_POLL_EV_N2E(EPOLLET)
#define ERTS_POLL_EV_ERR ERTS_POLL_EV_N2E(EPOLLERR|EPOLLHUP)
#elif ERTS_POLL_USE_DEVPOLL /* --- devpoll ----------------------------- */
#include <sys/devpoll.h>
#define ERTS_POLL_EV_E2N(EV) \
((short) ((EV) & ~((~((ErtsPollEvents) 0)) << 8*SIZEOF_SHORT)))
#define ERTS_POLL_EV_N2E(EV) \
((ErtsPollEvents) ((unsigned short) (EV)))
#define ERTS_POLL_EV_IN ERTS_POLL_EV_N2E(POLLIN)
#define ERTS_POLL_EV_OUT ERTS_POLL_EV_N2E(POLLOUT)
#define ERTS_POLL_EV_NVAL ERTS_POLL_EV_N2E(POLLNVAL)
#define ERTS_POLL_EV_ERR ERTS_POLL_EV_N2E(POLLERR|POLLHUP)
#elif ERTS_POLL_USE_KQUEUE /* --- kqueue ------------------------------ */
/* Kqueue use fallback defines (poll() or select()) */
#endif
#if ERTS_POLL_USE_POLL /* --- poll -------------------------------- */
#include <poll.h>
#define ERTS_POLL_EV_NKP_E2N(EV) \
((short) ((EV) & ~((~((ErtsPollEvents) 0)) << 8*SIZEOF_SHORT)))
#define ERTS_POLL_EV_NKP_N2E(EV) \
((ErtsPollEvents) ((unsigned short) (EV)))
/* At least on FreeBSD, we need POLLRDNORM for normal files, not POLLIN. */
/* Whether this is a bug in FreeBSD, I don't know. */
#ifdef POLLRDNORM
#define ERTS_POLL_EV_NKP_IN ERTS_POLL_EV_N2E(POLLIN|POLLRDNORM)
#else
#define ERTS_POLL_EV_NKP_IN ERTS_POLL_EV_N2E(POLLIN)
#endif
#define ERTS_POLL_EV_NKP_OUT ERTS_POLL_EV_N2E(POLLOUT)
#define ERTS_POLL_EV_NKP_NVAL ERTS_POLL_EV_N2E(POLLNVAL)
#define ERTS_POLL_EV_NKP_ERR ERTS_POLL_EV_N2E(POLLERR|POLLHUP)
#elif ERTS_POLL_USE_SELECT /* --- select ------------------------------ */
#define ERTS_POLL_EV_NKP_E2N(EV) (EV)
#define ERTS_POLL_EV_NKP_N2E(EV) (EV)
#define ERTS_POLL_EV_NKP_IN (((ErtsPollEvents) 1) << 0)
#define ERTS_POLL_EV_NKP_OUT (((ErtsPollEvents) 1) << 1)
#define ERTS_POLL_EV_NKP_NVAL (((ErtsPollEvents) 1) << 2)
#define ERTS_POLL_EV_NKP_ERR (((ErtsPollEvents) 1) << 3)
#endif /* ----------------------------------------- */
#if !defined(ERTS_POLL_EV_E2N) && defined(ERTS_POLL_EV_NKP_E2N)
/* poll(), select(), and kqueue() */
#define ERTS_POLL_EV_E2N(EV) ERTS_POLL_EV_NKP_E2N((EV))
#define ERTS_POLL_EV_N2E(EV) ERTS_POLL_EV_NKP_N2E((EV))
#define ERTS_POLL_EV_IN ERTS_POLL_EV_NKP_IN
#define ERTS_POLL_EV_OUT ERTS_POLL_EV_NKP_OUT
#define ERTS_POLL_EV_NVAL ERTS_POLL_EV_NKP_NVAL
#define ERTS_POLL_EV_ERR ERTS_POLL_EV_NKP_ERR
#endif
typedef struct ErtsPollSet_ *ErtsPollSet;
typedef struct {
ErtsSysFdType fd;
ErtsPollEvents events;
int on;
} ErtsPollControlEntry;
typedef struct {
ErtsSysFdType fd;
ErtsPollEvents events;
} ErtsPollResFd;
typedef struct {
char *primary;
char *fallback;
char *kernel_poll;
Uint memory_size;
int poll_set_size;
int fallback_poll_set_size;
int lazy_updates;
int pending_updates;
int batch_updates;
int concurrent_updates;
int max_fds;
#ifdef ERTS_POLL_COUNT_AVOIDED_WAKEUPS
long no_avoided_wakeups;
long no_avoided_interrupts;
long no_interrupt_timed;
#endif
} ErtsPollInfo;
#ifdef ERTS_POLL_NEED_ASYNC_INTERRUPT_SUPPORT
void ERTS_POLL_EXPORT(erts_poll_async_sig_interrupt)(ErtsPollSet);
#endif
void ERTS_POLL_EXPORT(erts_poll_interrupt)(ErtsPollSet,
int);
void ERTS_POLL_EXPORT(erts_poll_interrupt_timed)(ErtsPollSet,
int,
ErtsMonotonicTime);
ErtsPollEvents ERTS_POLL_EXPORT(erts_poll_control)(ErtsPollSet,
ErtsSysFdType,
ErtsPollEvents,
int on,
int* wake_poller
);
void ERTS_POLL_EXPORT(erts_poll_controlv)(ErtsPollSet,
ErtsPollControlEntry [],
int on);
int ERTS_POLL_EXPORT(erts_poll_wait)(ErtsPollSet,
ErtsPollResFd [],
int *,
ErtsMonotonicTime);
int ERTS_POLL_EXPORT(erts_poll_max_fds)(void);
void ERTS_POLL_EXPORT(erts_poll_info)(ErtsPollSet,
ErtsPollInfo *);
ErtsPollSet ERTS_POLL_EXPORT(erts_poll_create_pollset)(void);
void ERTS_POLL_EXPORT(erts_poll_destroy_pollset)(ErtsPollSet);
void ERTS_POLL_EXPORT(erts_poll_init)(void);
void ERTS_POLL_EXPORT(erts_poll_get_selected_events)(ErtsPollSet,
ErtsPollEvents [],
int);
int erts_poll_new_table_len(int old_len, int need_len);
#endif /* #ifndef ERL_POLL_H__ */
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