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  4. 18 Apr, 2020 1 commit
    • Philippe Gerum's avatar
      lib: introduce element visibility attribute · 9b42b85e
      Philippe Gerum authored
      
      
      Since core ABI 21, users can decide whether a new element should be
      made public or private depending on the value of clone flags added to
      the new long form of all element creation calls, i.e. evl_create_*().
      All evl_new_*() calls become a shorthand for their respective long
      form with reasonable default arguments, including private visibility.
      
      As a shorthand, libevl also interprets a slash character leading the
      name argument passed to these services as an implicit request for
      creating a public element. In other words, this is the same as passing
      EVL_CLONE_PUBLIC in the clone flags.
      
      A public element appears as a cdev in the /dev/evl hierarchy, which
      means that it is visible to other processes, which may share it. On
      the contrary, a private element is only known from the process
      creating it, although it does appear in the /sysfs hierarchy
      regardless.
      
      e.g.:
      
      efd = evl_attach_self("/visible-thread");
      
      total 0
      crw-rw----    1 root     root      248,   1 Apr 17 11:59 clone
      crw-rw----    1 root     root      246,   0 Apr 17 11:59 visible-thread
      
      or,
      
      efd = evl_attach_self("private-thread");
      
      total 0
      crw-rw----    1 root     root      248,   1 Apr 17 11:59 clone
      Signed-off-by: default avatarPhilippe Gerum <rpm@xenomai.org>
      9b42b85e
  5. 17 Apr, 2020 3 commits
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  9. 26 Feb, 2020 1 commit