cvs commit: apr/file_io/win32 readwrite.c

[stoddard]

stoddard    2002/10/29 04:15:19

  Modified:    file_io/win32 readwrite.c
  Log:
  Comment a not so obvious tidbit.
  
  Revision  Changes    Path
  1.72      +5 -0      apr/file_io/win32/readwrite.c
  
  Index: readwrite.c
  ===================================================================
  RCS file: /home/cvs/apr/file_io/win32/readwrite.c,v
  retrieving revision 1.71
  retrieving revision 1.72
  diff -u -r1.71 -r1.72
  --- readwrite.c       29 Oct 2002 02:19:50 -0000      1.71
  +++ readwrite.c       29 Oct 2002 12:15:19 -0000      1.72
  @@ -307,6 +307,11 @@
               apr_off_t offset = 0;
               apr_status_t rc;
               if (thefile->append) {
  +                /* apr_file_lock will mutex the file across processes.
  +                 * The call to apr_thread_mutex_lock is added to avoid
  +                 * a race condition between LockFile and WriteFile 
  +                 * that occasionally leads to deadlocked threads.
  +                 */
                   apr_thread_mutex_lock(thefile->mutex);
                   if (!thefile->pOverlapped) {
                       rc = apr_file_lock(thefile, APR_FLOCK_EXCLUSIVE);