021d7b21b7
iPXE is fundamentally asynchronous in operation: some operations continue in the background even after the foreground has continued to a new task. For example, the closing FIN/ACK exchanges of a TCP connection will take place in the background after an HTTP download has completed. Signed-off-by: Michael Brown <mcb30@ipxe.org>
80 lines
1.9 KiB
C
80 lines
1.9 KiB
C
/*
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* Copyright (C) 2012 Michael Brown <mbrown@fensystems.co.uk>.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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FILE_LICENCE ( GPL2_OR_LATER );
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#include <errno.h>
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#include <ipxe/process.h>
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#include <ipxe/timer.h>
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#include <ipxe/pending.h>
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/** @file
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*
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* Pending operations
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*
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*/
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/** Total count of pending operations */
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static int pending_total;
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/**
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* Mark an operation as pending
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*
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* @v pending Pending operation
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*/
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void pending_get ( struct pending_operation *pending ) {
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pending->count++;
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pending_total++;
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DBGC ( pending, "PENDING %p incremented to %d (total %d)\n",
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pending, pending->count, pending_total );
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}
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/**
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* Mark an operation as no longer pending
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*
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* @v pending Pending operation
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*/
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void pending_put ( struct pending_operation *pending ) {
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if ( pending->count ) {
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pending_total--;
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pending->count--;
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DBGC ( pending, "PENDING %p decremented to %d (total %d)\n",
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pending, pending->count, pending_total );
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}
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}
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/**
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* Wait for pending operations to complete
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*
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* @v timeout Timeout period, in ticks (0=indefinite)
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* @ret rc Return status code
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*/
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int pending_wait ( unsigned long timeout ) {
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unsigned long start = currticks();
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do {
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if ( pending_total == 0 )
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return 0;
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step();
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} while ( ( timeout == 0 ) || ( ( currticks() - start ) < timeout ) );
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return -ETIMEDOUT;
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}
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