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pending.c 2.0KB

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  1. /*
  2. * Copyright (C) 2012 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., 51 Franklin Street, Fifth Floor, Boston, MA
  17. * 02110-1301, USA.
  18. */
  19. FILE_LICENCE ( GPL2_OR_LATER );
  20. #include <errno.h>
  21. #include <ipxe/process.h>
  22. #include <ipxe/timer.h>
  23. #include <ipxe/pending.h>
  24. /** @file
  25. *
  26. * Pending operations
  27. *
  28. */
  29. /** Total count of pending operations */
  30. static int pending_total;
  31. /**
  32. * Mark an operation as pending
  33. *
  34. * @v pending Pending operation
  35. */
  36. void pending_get ( struct pending_operation *pending ) {
  37. pending->count++;
  38. pending_total++;
  39. DBGC ( pending, "PENDING %p incremented to %d (total %d)\n",
  40. pending, pending->count, pending_total );
  41. }
  42. /**
  43. * Mark an operation as no longer pending
  44. *
  45. * @v pending Pending operation
  46. */
  47. void pending_put ( struct pending_operation *pending ) {
  48. if ( pending->count ) {
  49. pending_total--;
  50. pending->count--;
  51. DBGC ( pending, "PENDING %p decremented to %d (total %d)\n",
  52. pending, pending->count, pending_total );
  53. }
  54. }
  55. /**
  56. * Wait for pending operations to complete
  57. *
  58. * @v timeout Timeout period, in ticks (0=indefinite)
  59. * @ret rc Return status code
  60. */
  61. int pending_wait ( unsigned long timeout ) {
  62. unsigned long start = currticks();
  63. do {
  64. if ( pending_total == 0 )
  65. return 0;
  66. step();
  67. } while ( ( timeout == 0 ) || ( ( currticks() - start ) < timeout ) );
  68. return -ETIMEDOUT;
  69. }