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[FreeRTOS Home] [Live FreeRTOS Forum] [FAQ] [Archive Top] [August 2009 Threads] heap_2.c causes out of memoryPosted by Martin Velek on August 20, 2009 Hello,
I am running this code: void testMem(void *pvParameters) { unsigned char * mem; for (int v = 0; v < 100000; v++) { for (int i = 1900; i < 2500; i++) { mem = (unsigned char *) pvPortMalloc((i) * sizeof(unsigned char)); if (NULL == mem) { // set breakpoint here } vPortFree(mem); } } } and after a while the mem becomes null and breakpoint is hitted. This code is running on CortexM3, LM3S8962 copiled by gcc or IAR and freeRTOS 5.4.2. Memory is configTOTAL_HEAP_SIZE ( ( size_t ) ( 32768 ) ). This is a school problem example but I have discovered it in the real situation during receiving ethernet packets. Have anyone the same problem?
Regard, Martin
RE: heap_2.c causes out of memoryPosted by Dave on August 20, 2009 This will be caused by memory fragmentation. See http://www.freertos.org/a00111.html where it says heap_2 "Should not be used if the memory being allocated and freed is of a random size".
RE: heap_2.c causes out of memoryPosted by Martin Velek on August 24, 2009 Hi Dave, thanks a lot. This was my problem. I am trying to implement a bget maybe it will help.
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