posix: Add self-contained pthread spinlock

Turn pthread_spinlock_t into a self-contained object.  On uni-processor
configurations, interrupts are disabled in the lock/trylock operations
and the previous interrupt status is restored in the corresponding
unlock operations.  On SMP configurations, a ticket lock is a acquired
and released in addition.

The self-contained pthread_spinlock_t object is defined by Newlib in
<sys/_pthreadtypes.h>.

typedef struct {
  struct _Ticket_lock_Control _lock;
  __uint32_t                  _interrupt_state;
} pthread_spinlock_t;

This implementation is simple and efficient.  However, this test case of
the Linux Test Project would fail due to call of printf() and sleep()
during spin lock ownership:

https://github.com/linux-test-project/ltp/blob/master/testcases/open_posix_testsuite/conformance/interfaces/pthread_spin_lock/1-2.c

There is only limited support for profiling on SMP configurations.

Delete CORE spinlock implementation.

Update #2674.

1 files changed, 0 insertions, 1 deletions

diff --git a/cpukit/rtems/src/rtemsobjectgetapiclassname.c b/cpukit/rtems/src/rtemsobjectgetapiclassname.c
index dd92e6ce6e..07bfb1b3a0 100644
--- a/cpukit/rtems/src/rtemsobjectgetapiclassname.c
+++ b/cpukit/rtems/src/rtemsobjectgetapiclassname.c
@@ -54,7 +54,6 @@ static const rtems_assoc_t rtems_object_api_posix_assoc[] = {
   { "Condition Variable",      OBJECTS_POSIX_CONDITION_VARIABLES, 0},
   { "Timer",                   OBJECTS_POSIX_TIMERS, 0},
   { "Barrier",                 OBJECTS_POSIX_BARRIERS, 0},
-  { "Spinlock",                OBJECTS_POSIX_SPINLOCKS, 0},
   { "RWLock",                  OBJECTS_POSIX_RWLOCKS, 0},
   { NULL,                      0, 0}
 };