9.2.4 Memory Allocation-Related Functions ‏نك‎

Memory functions are required to allocate fixed-size memory blocks from a memory partition (
number of blocks. The allocation takes place without fragmentation. The allocation and de-alloca
in fixed and deterministic time (Example 8.6). MUCOS memory functions for the tasks are as

aving integer
tion lake Place
Per Table 9.4

Table 9.4 Real-Time Operating System (RTOS) Memory Functions for Querying
Creating, Getting and Putting

Prototype Functions

OSMem *OSMemCreate (void *memAddr,

നന്തി MEMTYPE blockSize.

unsigned byte *memErr)

void *OSMemGet (OS_MEM *memCBPointer,
unsi gned byte भा चलापि)

unsigned byte QSMemQuery (OS_MEM
*memCBPointer, OS_MEM_DATA *memData)

unsigned byte OSMemPut (OS_MEM
*memCBPointée void *memBlock)

' MEMTYPE is unsigned int of 16 or 32 bits.

What are the Para-
meters Returning
and Passed?

R/ and 01

RJ and PJ

RK and PK

RL and PL

When is this OS Call?

To create and initialize a memory
partition. The memory blocks are then
allotted from the partition

To find pointer of the memory control
block allocated to the memory blocks,
NULL if no blocks, OSMemGet is used
when an interrupt service routine (ISR) of
task needs to get the memory blockis)

To find pointers of the memory control
block and OS_MemData data structure

To retum a pointer of memory block in
the memory partitions from the memory
control block pointer. OSMemPut is used
when the application no longer needs the
memory block