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Shell Programming and Scripting
cutting fields and doing trim in awk
Post 302239387 by naoseionome on Tuesday 23rd of September 2008 01:57:12 PM
09-23-2008
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LEARN ABOUT OSF1
wakeup
wakeup(9r) wakeup(9r) NAME
wakeup - General: Wakes up all processes sleeping on a specified address SYNOPSIS
void wakeup( caddr_t channel ); ARGUMENTS
Specifies the address on which the wakeup is to be issued. DESCRIPTION
The wakeup routine wakes up all processes sleeping on the address specified by the channel argument. All processes sleeping on this address are awakened and made ready to be scheduled according to the priorities they specified when they went to sleep. It is possible that there are no processes sleeping on the channel at the time the wakeup is issued. This situation can occur for a variety of reasons and does not represent an error condition. The sleep and wakeup routines block and unblock a process. Generally, a device driver issues these routines on behalf of a process request- ing I/O while a transfer is in progress. That is, a process requesting I/O is put to sleep on an address associated with the request by the appropriate device driver routine. When the transfer has asynchronously completed, the device driver interrupt service routine issues a wakeup on the address associated with the completed request. This action makes the relevant process to be scheduled. The process resumes execution within the relevant device driver routine at the point immediately following the request to sleep. The driver, on behalf of the process, can then determine whether the condition for which it was sleeping (in this example, completion of an I/O request) has been removed. If so, it can continue on to complete the I/O request. Otherwise, the appropriate driver routine can decide to put the process back to sleep to await removal of the indicated condition. RETURN VALUES
None SEE ALSO
Routines: mpsleep(9r), sleep(9r) wakeup(9r)