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  1. /*
  2. * Copyright (C) 2006 Michael Brown <mbrown@fensystems.co.uk>.
  3. *
  4. * This program is free software; you can redistribute it and/or
  5. * modify it under the terms of the GNU General Public License as
  6. * published by the Free Software Foundation; either version 2 of the
  7. * License, or any later version.
  8. *
  9. * This program is distributed in the hope that it will be useful, but
  10. * WITHOUT ANY WARRANTY; without even the implied warranty of
  11. * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  12. * General Public License for more details.
  13. *
  14. * You should have received a copy of the GNU General Public License
  15. * along with this program; if not, write to the Free Software
  16. * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  17. */
  18. #include <errno.h>
  19. #include <gpxe/process.h>
  20. #include <gpxe/async.h>
  21. /** @file
  22. *
  23. * Asynchronous operations
  24. *
  25. */
  26. /**
  27. * Wait for asynchronous operation to complete
  28. *
  29. * @v aop Asynchronous operation
  30. * @ret rc Return status code
  31. *
  32. * Blocks until the specified asynchronous operation has completed.
  33. * The return status is the return status of the asynchronous
  34. * operation itself.
  35. */
  36. int async_wait ( struct async_operation *aop ) {
  37. int rc;
  38. /* Wait for operation to complete */
  39. do {
  40. step();
  41. rc = async_status ( aop );
  42. } while ( rc == -EINPROGRESS );
  43. /* Prepare for next call to async_wait() */
  44. async_set_status ( aop, -EINPROGRESS );
  45. return rc;
  46. }