[lwip-devel] [bug #21077] lwip_stats.mem.used is inaccurate, sometimes negative

[Frédéric Bernon]

Follow-up Comment #3, bug #21077 (project lwip):

Simple code to show the problem (with the current CVS HEAD):

void main()
{ 
   void* pmem[4]={NULL};
   
   lwip_init();

   stats_display();
   pmem[0]=mem_malloc(7);
   pmem[1]=mem_malloc(23);
   pmem[2]=mem_malloc(17);
   pmem[3]=mem_malloc(11);
   stats_display();
   mem_free(pmem[1]);
   pmem[1]=mem_malloc(3);
   stats_display();
   mem_free(pmem[2]);
   mem_free(pmem[3]);
   mem_free(pmem[0]);
   stats_display();
   mem_free(pmem[1]);
   stats_display();
}

With such values in lwipopts.h :

#define MEM_ALIGNMENT           1
#define MEM_SIZE                10240

I got this output :

MEM HEAP
        avail: 10240
        used: 0
        max: 0
        err: 0

MEM HEAP
        avail: 10240
        used: 84
        max: 84
        err: 0

MEM HEAP
        avail: 10240
        used: 73
        max: 84
        err: 0

MEM HEAP
        avail: 10240
        used: 17
        max: 84
        err: 0

MEM HEAP
        avail: 10240
        used: 65525
        max: 84
        err: 0

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