Replace the separate user extension iterations with a single iteration
function. This reduces code size and improves maintainability since the
iteration logic is only in one function. The runtime overhead is
insignificant.
The comment in confdefs.h shows how to do it:
An application can define its own scheduling policy by defining
CONFIGURE_SCHEDULER_USER and the following:
- CONFIGURE_SCHEDULER_ENTRY_POINTS
- CONFIGURE_MEMORY_FOR_SCHEDULER - base memory
- CONFIGURE_MEMORY_PER_TASK_FOR_SCHEDULER - per task memory
Add and use rtems_blkdev_request_done(). Block device transfer requests
must signal the completion status now with rtems_blkdev_request_done().
The return value of the block device IO control will be ignored for
transfer requests.
The first parameter of rtems_blkdev_request_cb is now the transfer
request structure.
Renamed rtems_blkdev_request::req_done to rtems_blkdev_request::done to
break third party drivers at compile time, otherwise this API change
would result in runtime errors.
System events are similar to normal events. They offer a second set of
events. These events are intended for internal RTEMS use and should not
be used by applications (with the exception of the transient system
event).
The set block size must synchronize and purge the disk to avoid an
inconsistent cache state and data corruption. The synchronization is
optional depending on the new sync parameter. In some contexts a
synchronization must not be performed, e.g. during disk creation.
The work areas (RTEMS work space and C program heap) will be initialized
now in a separate step and are no longer part of
rtems_initialize_data_structures(). Initialization is performed with
tables of Heap_Area entries. This allows usage of scattered memory
areas present on various small scale micro-controllers.
The sbrk() support API changes also. The bsp_sbrk_init() must now deal
with a minimum size for the first memory chunk to take the configured
work space size into account.
The _Heap_Extend() has now the same signature as _Heap_Initialize().
The 4th parameter is ignored (page size in _Heap_Initialize()).
Add Heap_Area and Heap_Initialization_or_extend_handler.
Add and test _Heap_No_extend().
This helps to do a table based heap initialization and extension.
Create a table of Heap_Area elements and iterate through it. Set the
handler to _Heap_Initialize() in the first iteration and then to
_Heap_Extend().
Use _Workspace_Allocate_or_fatal_error() consistently in case auto
extend is turned off. This helps to avoid undefined behaviour in
_API_Mutex_Allocate() in case _API_Mutex_Information() fails.
