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forkables: simplify disabling via shm

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* Rename cygwin_shared->prefer_forkable_hardlinks to
  forkable_hardlink_support, with values
  0 for Unknown, 1 for Supported, -1 for Unsupported.
  Upon first dll loaded ever, dll_list::forkable_ntnamesize checks the
  /var/run/cygfork directory to both exist and reside on NTFS, setting
  cygwin_shared->forkable_hardlink_support accordingly.
* Replace enum forkables_needs by bool forkables_created: Set
  to True by request_forkables after creating forkable hardlinks.
This commit is contained in:
Michael Haubenwallner
2017-03-01 10:19:37 +01:00
committed by Corinna Vinschen
parent 8bbb3d3a23
commit 135577f708
5 changed files with 65 additions and 148 deletions
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winsup/cygwin/include/cygwin/version.h
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@@ -518,7 +518,7 @@ details. */
regions. It is incremented when incompatible changes are made to the shared
memory region *or* to any named shared mutexes, semaphores, etc. */
#define CYGWIN_VERSION_SHARED_DATA 6
#define CYGWIN_VERSION_SHARED_DATA 5
/* An identifier used in the names used to create shared objects. The full
names include the CYGWIN_VERSION_SHARED_DATA version as well as this