Fixing BUG#17719 "Delete of binlog files fails on Windows"

 and BUG#19208 "Test 'rpl000017' hangs on Windows".
 Both bugs are caused by attempting to delete an opened
 file and to create immediatedly a new one with the same
 name. On Windows it can be supported only on NT-platforms
 (by using FILE_SHARE_DELETE mode and with renaming the
 file before deletion). Because deleting not-closed files
 is not supported on all platforms (e.g. Win 98|ME) this
 is to be considered harmful and should be eliminated by
 a "code redesign".


VC++Files/mysys/mysys.vcproj:
  To be sure that __NT__ is defined for Win configurations.
   Temporary, to be changed in more appropriate way.
include/my_sys.h:
  Adding my_delete_allow_opened to be invoked to delete
   a (possibly) not closed file on Windows NT-platforms.
mysys/my_delete.c:
  Adding nt_share_delete() function implementing
   a (possibly) not closed file deletion on Windows NT.
sql/log.cc:
  MYSQL_LOG::reset_logs(): Deleting usually not
   closed binlog files.

1 files changed, 8 insertions, 0 deletions

diff --git a/include/my_sys.h b/include/my_sys.h
index 229389f1ac5..6457113d282 100644
--- a/include/my_sys.h
+++ b/include/my_sys.h
@@ -541,6 +541,7 @@ typedef int (*Process_option_func)(void *ctx, const char *group_name,
 
 #include <my_alloc.h>
 
+
 	/* Prototypes for mysys and my_func functions */
 
 extern int my_copy(const char *from,const char *to,myf MyFlags);
@@ -613,6 +614,13 @@ extern File my_sopen(const char *path, int oflag, int shflag, int pmode);
 #endif
 extern int check_if_legal_filename(const char *path);
 
+#if defined(__WIN__) && defined(__NT__)
+extern int nt_share_delete(const char *name,myf MyFlags);
+#define my_delete_allow_opened(fname,flags)  nt_share_delete((fname),(flags))
+#else
+#define my_delete_allow_opened(fname,flags)  my_delete((fname),(flags))
+#endif
+
 #ifndef TERMINATE
 extern void TERMINATE(FILE *file);
 #endif