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Update #2674.
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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.
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Unify the status codes of the Classic and POSIX API to use the new enum
Status_Control. This eliminates the Thread_Control::Wait::timeout_code
field and the timeout parameter of _Thread_queue_Enqueue_critical() and
_MPCI_Send_request_packet(). It gets rid of the status code translation
tables and instead uses simple bit operations to get the status for a
particular API. This enables translation of status code constants at
compile time. Add _Thread_Wait_get_status() to avoid direct access of
thread internal data structures.
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Rename _Objects_Get_local() into _Objects_Get(). Confusions with the
previous _Objects_Get() function are avoided since the Objects_Locations
parameter is gone.
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Make the interrupt lock context the second parameter to avoid register
moves.
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Make the id the first parameter since usual callers get the object
identifier as the first parameter themself.
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Use an ISR lock to protect the spinlock state. Remove empty attributes.
Update #2555.
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Update #2408.
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Move implementation specific parts of object.h and object.inl into new
header file objectimpl.h. The object.h contains now only the
application visible API.
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Move implementation specific parts of corespinlock.h and
corespinlock.inl into new header file corespinlockimpl.h. The
corespinlock.h contains now only the application visible API.
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Move implementation specific parts of spinlock.h and spinlock.inl into
new header file spinlockimpl.h. The spinlock.h contains now only the
application visible API.
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