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/* vim:ts=8:sts=4:sw=4:noai:noexpandtab
*
* Low kernel overhead event notify mechanism, or standard pipes.
*
* Copyright (c) 2008 Miru Limited.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#if !defined (__PGM_IMPL_FRAMEWORK_H_INSIDE__) && !defined (PGM_COMPILATION)
# error "Only <framework.h> can be included directly."
#endif
#ifndef __PGM_IMPL_NOTIFY_H__
#define __PGM_IMPL_NOTIFY_H__
typedef struct pgm_notify_t pgm_notify_t;
#ifndef _WIN32
# include <fcntl.h>
# include <unistd.h>
# ifdef CONFIG_HAVE_EVENTFD
# include <sys/eventfd.h>
# endif
#else /* _WIN32 */
# include <memory.h>
# include <ws2tcpip.h>
#endif
#include <pgm/types.h>
#include <impl/messages.h>
PGM_BEGIN_DECLS
struct pgm_notify_t {
#if defined(CONFIG_HAVE_EVENTFD)
int eventfd;
#elif !defined(_WIN32)
int pipefd[2];
#else
SOCKET s[2];
#endif /* _WIN32 */
};
#if defined(CONFIG_HAVE_EVENTFD)
# define PGM_NOTIFY_INIT { -1 }
#elif !defined(_WIN32)
# define PGM_NOTIFY_INIT { { -1, -1 } }
#else
# define PGM_NOTIFY_INIT { { INVALID_SOCKET, INVALID_SOCKET } }
#endif
static inline
bool
pgm_notify_is_valid (
pgm_notify_t* notify
)
{
if (PGM_UNLIKELY(NULL == notify))
return FALSE;
#if defined(CONFIG_HAVE_EVENTFD)
if (PGM_UNLIKELY(-1 == notify->eventfd))
return FALSE;
#elif !defined(_WIN32)
if (PGM_UNLIKELY(-1 == notify->pipefd[0] || -1 == notify->pipefd[1]))
return FALSE;
#else
if (PGM_UNLIKELY(INVALID_SOCKET == notify->s[0] || INVALID_SOCKET == notify->s[1]))
return FALSE;
#endif /* _WIN32 */
return TRUE;
}
static inline
int
pgm_notify_init (
pgm_notify_t* notify
)
{
pgm_assert (NULL != notify);
#if defined(CONFIG_HAVE_EVENTFD)
notify->eventfd = -1;
int retval = eventfd (0, 0);
if (-1 == retval)
return retval;
notify->eventfd = retval;
const int fd_flags = fcntl (notify->eventfd, F_GETFL);
if (-1 != fd_flags)
retval = fcntl (notify->eventfd, F_SETFL, fd_flags | O_NONBLOCK);
return 0;
#elif !defined(_WIN32)
notify->pipefd[0] = notify->pipefd[1] = -1;
int retval = pipe (notify->pipefd);
pgm_assert (0 == retval);
/* set non-blocking */
/* write-end */
int fd_flags = fcntl (notify->pipefd[1], F_GETFL);
if (fd_flags != -1)
retval = fcntl (notify->pipefd[1], F_SETFL, fd_flags | O_NONBLOCK);
pgm_assert (notify->pipefd[1]);
/* read-end */
fd_flags = fcntl (notify->pipefd[0], F_GETFL);
if (fd_flags != -1)
retval = fcntl (notify->pipefd[0], F_SETFL, fd_flags | O_NONBLOCK);
pgm_assert (notify->pipefd[0]);
return retval;
#else
/* use loopback sockets to simulate a pipe suitable for win32/select() */
struct sockaddr_in addr;
SOCKET listener;
int addrlen = sizeof (addr);
notify->s[0] = notify->s[1] = INVALID_SOCKET;
listener = socket (AF_INET, SOCK_STREAM, 0);
pgm_assert (listener != INVALID_SOCKET);
memset (&addr, 0, sizeof (addr));
addr.sin_family = AF_INET;
addr.sin_addr.s_addr = inet_addr ("127.0.0.1");
pgm_assert (addr.sin_addr.s_addr != INADDR_NONE);
int rc = bind (listener, (const struct sockaddr*)&addr, sizeof (addr));
pgm_assert (rc != SOCKET_ERROR);
rc = getsockname (listener, (struct sockaddr*)&addr, &addrlen);
pgm_assert (rc != SOCKET_ERROR);
// Listen for incoming connections.
rc = listen (listener, 1);
pgm_assert (rc != SOCKET_ERROR);
// Create the socket.
notify->s[1] = WSASocket (AF_INET, SOCK_STREAM, 0, NULL, 0, 0);
pgm_assert (notify->s[1] != INVALID_SOCKET);
// Connect to the remote peer.
rc = connect (notify->s[1], (struct sockaddr*)&addr, addrlen);
pgm_assert (rc != SOCKET_ERROR);
// Accept connection.
notify->s[0] = accept (listener, NULL, NULL);
pgm_assert (notify->s[0] != INVALID_SOCKET);
// Set read-end to non-blocking mode
const unsigned long one = 1;
rc = ioctlsocket (notify->s[0], FIONBIO, &one);
pgm_assert (rc != SOCKET_ERROR);
// We don't need the listening socket anymore. Close it.
rc = closesocket (listener);
pgm_assert (rc != SOCKET_ERROR);
return 0;
#endif
}
static inline
int
pgm_notify_destroy (
pgm_notify_t* notify
)
{
pgm_assert (NULL != notify);
#if defined(CONFIG_HAVE_EVENTFD)
if (-1 != notify->eventfd) {
close (notify->eventfd);
notify->eventfd = -1;
}
#elif !defined(_WIN32)
if (-1 != notify->pipefd[0]) {
close (notify->pipefd[0]);
notify->pipefd[0] = -1;
}
if (-1 != notify->pipefd[1]) {
close (notify->pipefd[1]);
notify->pipefd[1] = -1;
}
#else
if (INVALID_SOCKET != notify->s[0]) {
closesocket (notify->s[0]);
notify->s[0] = INVALID_SOCKET;
}
if (INVALID_SOCKET != notify->s[1]) {
closesocket (notify->s[1]);
notify->s[1] = INVALID_SOCKET;
}
#endif
return 0;
}
static inline
int
pgm_notify_send (
pgm_notify_t* notify
)
{
pgm_assert (NULL != notify);
#if defined(CONFIG_HAVE_EVENTFD)
pgm_assert (-1 != notify->eventfd);
uint64_t u = 1;
ssize_t s = write (notify->eventfd, &u, sizeof(u));
return (s == sizeof(u));
#elif !defined(_WIN32)
pgm_assert (-1 != notify->pipefd[1]);
const char one = '1';
return (1 == write (notify->pipefd[1], &one, sizeof(one)));
#else
pgm_assert (INVALID_SOCKET != notify->s[1]);
const char one = '1';
return (1 == send (notify->s[1], &one, sizeof(one), 0));
#endif
}
static inline
int
pgm_notify_read (
pgm_notify_t* notify
)
{
pgm_assert (NULL != notify);
#if defined(CONFIG_HAVE_EVENTFD)
pgm_assert (-1 != notify->eventfd);
uint64_t u;
return (sizeof(u) == read (notify->eventfd, &u, sizeof(u)));
#elif !defined(_WIN32)
pgm_assert (-1 != notify->pipefd[0]);
char buf;
return (sizeof(buf) == read (notify->pipefd[0], &buf, sizeof(buf)));
#else
pgm_assert (INVALID_SOCKET != notify->s[0]);
char buf;
return (sizeof(buf) == recv (notify->s[0], &buf, sizeof(buf), 0));
#endif
}
static inline
void
pgm_notify_clear (
pgm_notify_t* notify
)
{
pgm_assert (NULL != notify);
#if defined(CONFIG_HAVE_EVENTFD)
pgm_assert (-1 != notify->eventfd);
uint64_t u;
while (sizeof(u) == read (notify->eventfd, &u, sizeof(u)));
#elif !defined(_WIN32)
pgm_assert (-1 != notify->pipefd[0]);
char buf;
while (sizeof(buf) == read (notify->pipefd[0], &buf, sizeof(buf)));
#else
pgm_assert (INVALID_SOCKET != notify->s[0]);
char buf;
while (sizeof(buf) == recv (notify->s[0], &buf, sizeof(buf), 0));
#endif
}
static inline
int
pgm_notify_get_fd (
pgm_notify_t* notify
)
{
pgm_assert (NULL != notify);
#if defined(CONFIG_HAVE_EVENTFD)
pgm_assert (-1 != notify->eventfd);
return notify->eventfd;
#elif !defined(_WIN32)
pgm_assert (-1 != notify->pipefd[0]);
return notify->pipefd[0];
#else
pgm_assert (INVALID_SOCKET != notify->s[0]);
return notify->s[0];
#endif
}
PGM_END_DECLS
#endif /* __PGM_IMPL_NOTIFY_H__ */
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