C++ (Cpp) _ump_osu_lock_term Examples

Example #1

File: ump_arch.c Project: carlocaione/buildroot-ved-2014-05-27

void ump_arch_close(void)
{
	_ump_osu_lock_auto_init(&ump_lock_arch, _UMP_OSU_LOCKFLAG_DEFAULT, 0, 0);

	/* Check that the lock was initialized */
	if (NULL == ump_lock_arch)
	{
		UMP_DEBUG_PRINT(1, ("UMP: ump_arch_close() failed to init lock\n"));
		return;
	}

	/* Attempt to obtain a lock */
	if (_UMP_OSU_ERR_OK !=  _ump_osu_lock_wait(ump_lock_arch, _UMP_OSU_LOCKMODE_RW))
	{
		UMP_DEBUG_PRINT(1, ("UMP: ump_arch_close() failed to acquire lock\n"));
		return;
	}

	UMP_DEBUG_ASSERT(0 < ump_ref_count, ("UMP: ump_arch_close() called while no references exist"));

	if (ump_ref_count > 0)
	{
		ump_ref_count--;

		if (0 == ump_ref_count)
		{
			_ump_osu_errcode_t retval = _ump_uku_close(&ump_uk_ctx);
			UMP_DEBUG_ASSERT(retval == _UMP_OSU_ERR_OK, ("UMP: Failed to close UMP interface"));
			UMP_IGNORE(retval);
			ump_uk_ctx = NULL;
			_ump_osu_lock_signal(ump_lock_arch, _UMP_OSU_LOCKMODE_RW);
			_ump_osu_lock_term(ump_lock_arch);   /* Not 100% thread safe, since another thread can already be waiting for this lock in ump_arch_open() */
			ump_lock_arch = NULL;
			return;
		}
	}

	/* Signal the lock so someone else can use it */
	_ump_osu_lock_signal(ump_lock_arch, _UMP_OSU_LOCKMODE_RW);
}