sync.h File Reference

Synchronization program based on pipe. More...

#include <stdio.h>
#include <unistd.h>
#include <errno.h>

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Functions
static int	TELL_WAIT (void)
	Pipe initialize sequence. You must call before use this source. More...
static int	TELL_PARENT (void)
	The child calls parents. More...
static int	WAIT_PARENT (void)
	Receive from parent's call. More...
static int	TELL_CHILD (void)
	The parent calls children. More...
static int	WAIT_CHILD (void)
	Receive from child's call. More...

Variables
static int	pfd1 [2]
static int	pfd2 [2]

Detailed Description

Synchronization program based on pipe.

Copyright

"Container Tracer" which executes the container performance mesurements Copyright (C) 2020 BlaCkinkGJ

This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.

This program 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 General Public License for more details.

You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

In Linux, the size of pipe is about 4KB. And the synchronization method is implemented by using R/W's blocking specification.

Author

BlaCkinkGJ (ss5ki.nosp@m.jun@.nosp@m.gmail.nosp@m..com)

Version

0.1

Date

2020-08-09

Note

Rochkind, M. J. (2004). Advanced UNIX programming. Pearson Education.

Function Documentation

TELL_CHILD()

static int TELL_CHILD ( void  )

static

The parent calls children.

Returns

0 for success to write, -EIO for fail to write

Note

This doesn't wake up a specific child. This wakes randomly selected a child.

TELL_PARENT()

static int TELL_PARENT ( void  )

static

The child calls parents.

Returns

0 for success to write, -EIO for fail to write

Note

This doesn't wake up a specific parent. This wakes randomly selected a parent.

TELL_WAIT()

static int TELL_WAIT ( void  )

static

Pipe initialize sequence. You must call before use this source.

Returns

0 for success to make pipe, -EPIPE for fail to make pipe.

WAIT_CHILD()

static int WAIT_CHILD ( void  )

static

Receive from child's call.

Returns

0 for success to read, -EIO for fail to read.

WAIT_PARENT()

static int WAIT_PARENT ( void  )

static

Receive from parent's call.

Returns

0 for success to read, -EIO for fail to read.

Variable Documentation

pfd1

int pfd1[2]

static

pfd2

int pfd2[2]

static