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usleep()

int usleep ( int $micro_seconds )

Description

usleep() delays the program execution for the specified number of micro-seconds

※ available F/W version : all

Parameters

• $micro_seconds - the sleeping time in micro-seconds (1 second = 1,000,000 micro-second)
  If this parameter is negative the function is the same to when this parameter is 0. The sleep time is inaccurate if this value is under 1,000 (1ms)

Return values

Returns 0, PHP error on error

Example

<?php
$pid_st0 = pid_open("/mmap/st0");
pid_ioctl($pid_st0, "set mode free");

$sleeping_time = 1000000;

echo "sleeping for $sleeping_time micro-seconds...\r\n";  // OUTPUT: sleeping for 1000000 micro-seconds...

pid_ioctl($pid_st0, "start");  // timer start
usleep($sleeping_time);

$tick = pid_ioctl($pid_st0, "get count");
printf("slept time: %d ms\r\n", $tick);  // OUTPUT: slept time: 1000 ms
?>

See also

sleep()

Remarks

This function is identical to the PHP group’s usleep() function except error handling. If the specified number of seconds is negative, the PHP group’s usleep() function generates a E_WARNING.