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DELAY

Section: Linux Fast-STREAMS DDI/DKI (9)
Updated: 2008-10-31
Index Return to Main Contents

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NAME

delay - postpone the calling process for a number of clock ticks

SYNOPSIS

#include <sys/stream.h>

#include <sys/ddi.h>

void delay(unsigned long ticks)

ARGUMENTS

ticks

the number of clock ticks to delay.

INTERFACE

DDI/DKI.

DESCRIPTION

delay() schedules the calling process for at least the number of system clock ticks specified by the ticks argument.

USAGE

delay() is only usable from user (blockable) context. This makes it not very useful for STREAMS drivers and modules. See SV_WAIT(9) or qwait(9) for other approaches.

RETURN

delay() returns void.

ERRORS

delay() fails silently.

CONTEXT

delay() can be called from user context which includes qi_qopen(9) and qi_qclose(9) procedures. If called from STREAMS context, it will block the softirq kernel daemon thread and have hazardous effects on system performance.

MP-STREAMS

delay() is MP-safe.

NOTICES

delay() will not be interrupted by a signal.

IMPLEMENTATION

delay() is implemented using the Linux kernel function schedule_timeout(9).

SEE ALSO

udelay(9), drv_usecwait(9), SV_WAIT(9), qwait(9).

BUGS

delay() has no known bugs.

COMPATIBILITY

delay() is compatible with SVR 4.2 MP DDI/DKI[1] and systems based on SVR 4.2 MP, with the following portability considerations:

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delay() is a function that was originally included in STREAMS[2] that later made it into the DDI/DKI[1], which is why it is included here instead of in the STREAMS Compatibility Modules strcompat(5) with the other DDI/DKI functions.

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delay() is provided for source level compatibility with SVR 4.2 for the purpose of porting SVR 4.2 drivers to Linux. Because internal structures and definitions for Linux Fast-STREAMS[3] differ from that of SVR 4.2 binaries are incompatible.

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delay() only provides functionality comparable to SVR 4.2 for use by STREAMS drivers and modules. Any and all functionality provided by delay() in support of non-STREAMS devices are not supported.

See STREAMS(9) for additional compatibility considerations.

CONFORMANCE

SVR 4.2 MP DDI/DKI[1,4].

HISTORY

delay() first appeared in SVR 3[5].

REFERENCES

[1]

USL DDI/DKI, Device Driver Interface/Driver-Kernel Interface (DDI/DKI) Reference Manual for Intel Processors, 1992, (Englewood Cliffs, New Jersey), AT&T UNIX System Laboratories, Inc., Prentice Hall.

[2]

SVR 3, UNIX® System V Release 3 STREAMS Programmer's Guide, (Englewood Cliffs, New Jersey), AT&T UNIX System Laboratories, Inc., Prentice Hall.

[3]

streams-0.9.2, Linux Fast-STREAMS (LfS) 0.9.2 Source Code, Brian Bidulock, ed., OpenSS7 Corporation. <http://www.openss7.org/>

[4]

SVR 4.2, STREAMS Programmer's Guide, 1992, (Englewood Cliffs, New Jersey), AT&T UNIX System Laboratories, Inc., Prentice Hall.

[5]

SVR 3, UNIX® System V Release 3 Programmer's Manual, (Englewood Cliffs, New Jersey), AT&T UNIX System Laboratories, Inc., Prentice Hall.

TRADEMARKS

OpenSS7tm

is a trademark of OpenSS7 Corporation.

Linux®

is a registered trademark of Linus Torvalds.

UNIX®

is a registered trademark of The Open Group.

Solaris®

is a registered trademark of Sun Microsystems.

Other trademarks are the property of their respective owners.

IDENTIFICATION

Linux Fast-STREAMS: Package streams version 0.9.2.4 released 2008-10-31.

Copyright©1997-2008OpenSS7 Corp. All Rights Reserved.
(See roff source for permission notice.)

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Index

NAME

SYNOPSIS

ARGUMENTS

INTERFACE

DESCRIPTION

USAGE

RETURN

ERRORS

CONTEXT

MP-STREAMS

NOTICES

IMPLEMENTATION

SEE ALSO

BUGS

COMPATIBILITY

CONFORMANCE

HISTORY

REFERENCES

TRADEMARKS

IDENTIFICATION

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