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, 13 deletions

diff --git a/testsuites/psxtests/psxconfig01/init.c b/testsuites/psxtests/psxconfig01/init.c
index 582fd11197..1513b54d73 100644
--- a/testsuites/psxtests/psxconfig01/init.c
+++ b/testsuites/psxtests/psxconfig01/init.c
@@ -67,7 +67,6 @@ const char rtems_test_name[] = "PSXCONFIG 1";
 #define CONFIGURE_MAXIMUM_POSIX_QUEUED_SIGNALS 7
 #define CONFIGURE_MAXIMUM_POSIX_RWLOCKS 31
 #define CONFIGURE_MAXIMUM_POSIX_SEMAPHORES 41
-#define CONFIGURE_MAXIMUM_POSIX_SPINLOCKS 17
 #define CONFIGURE_INITIAL_EXTENSIONS RTEMS_TEST_INITIAL_EXTENSION
 
 #define CONFIGURE_MAXIMUM_POSIX_THREADS 3
@@ -515,18 +514,6 @@ static rtems_task Init(rtems_task_argument argument)
   );
 #endif
 
-#ifdef CONFIGURE_MAXIMUM_POSIX_SPINLOCKS
-  for (i = 0; i < CONFIGURE_MAXIMUM_POSIX_SPINLOCKS; ++i) {
-    pthread_spinlock_t spinlock;
-    eno = pthread_spin_init(&spinlock, 0);
-    rtems_test_assert(eno == 0);
-  }
-  rtems_resource_snapshot_take(&snapshot);
-  rtems_test_assert(
-    snapshot.posix_api.active_spinlocks == CONFIGURE_MAXIMUM_POSIX_SPINLOCKS
-  );
-#endif
-
 #ifdef CONFIGURE_MAXIMUM_POSIX_THREADS
   for (i = 0; i < CONFIGURE_MAXIMUM_POSIX_THREADS; ++i) {
     pthread_t thread;