[RTEMS Project] #3928: Implement clock_getcpuclockid()

[RTEMS trac]

#3928: Implement clock_getcpuclockid()
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  Reporter:  Joel Sherrill  |      Owner:  (none)
      Type:  enhancement    |     Status:  new
  Priority:  normal         |  Milestone:  Indefinite
 Component:  posix          |    Version:
  Severity:  normal         |   Keywords:  POSIX-Compliance
Blocked By:                 |   Blocking:
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 The clock_getcpuclockid() method currently returns ENOSYS. It should be
 implemented. Since there is a single process, the execution time
 statistics should be the same as the system uptime. When this execution is
 set via clock_settime(), the system uptime should not be changed but a
 delta calculated. Thus the process execution time is a +/- delta from
 system uptime with an initial delta of zero.

 https://pubs.opengroup.org/onlinepubs/9699919799/functions/clock_getcpuclockid.html

 There is a single constant value for this clock ID which is already
 defined.

 Beyond adding the one method, the methods clock_gettime and clock_settime
 must also be modified to support this clock type. There may be other cases
 where per process cpu clock id is used. A search for this capability in
 the POSIX standard will have to be done to ensure all use cases are
 covered.

 This also will require writing test code and updating the POSIX Compliance
 Guide via the tracking spreadsheet.

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Ticket URL: <http://devel.rtems.org/ticket/3928>
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