SCO OpenServer

delay(D3oddi)

delay -- delay process execution for specified time

Synopsis

void delay(int ticks);

Description

The delay( ) function uses the timeout(D3oddi), sleep(D3oddi) and wakeup(D3oddi) calls to block the current process for a duration equivalent to the specified number of clock ticks. The exact length of the delay is not guaranteed but it will not be less than ticks -1 clock ticks. The length of a clock tick can vary across different implementations so drivers should not include any hard-coded assumptions about the length of a tick.

Arguments

ticks: integer that specifies the number of clock ticks to delay.

Return values

None.

Usage

The delay( ) function does not degrade performance as much as the suspend( ) function does.

Context and synchronization

User or blockable context.

Hardware applicability

All

Version applicability

oddi: 1, 2, 2mp, 3, 3mp, 4, 4mp, 5, 5mp, 6, 6mp

Differences between versions

For ODDI versions prior to version 6 that do not support the high-precision system clock, delay( ) blocks the current process for the absolute number of clock ticks that are specified. See ``Clock, system'' in HDK Technical Reference for more information about the high-precision system clock.

SVR5 DDI compatibility

The delay(D3) function is the same as the delay(D3oddi) function. DDI drivers use the drv_usectohz(D3) and drv_hztousec(D3) functions as necessary to convert between clock ticks and microseconds (implementation independent units).

References

sleep(D3oddi), suspend(D3oddi), timeout(D3oddi), wakeup(D3oddi)

``Delays and busy-waits'' in HDK Technical Reference