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22_2 - Dynamic Memory Allocation 1 Outline ExplicitFreeList...

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1 Dynamic Memory Allocation
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2 Outline Implementation of a simple allocator Explicit Free List Segregated Free List Suggested reading: 10.9
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3 Dynamic Memory Allocation Explicit vs. Implicit Memory Allocator Explicit:  application allocates and frees space  E.g.,  malloc  and  free  in C Implicit: application allocates, but does not free space E.g. garbage collection in Java, ML or Lisp
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4 Dynamic Memory Allocation Allocation In both cases the memory allocator provides an abstraction of  memory as a set of blocks Doles out free memory blocks to application
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5 Malloc package #include <stdlib.h> void *malloc(size_t size) if successful: returns a pointer to a memory block of at least size bytes, aligned to 8-byte boundary. if size==0, returns NULL if unsuccessful: returns NULL void free(void *p) returns the block pointed at by p to pool of available memory p must come from a previous call to malloc,calloc or realloc.
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6 sbrk() Function #include <unistd.h> void *sbrk(int incr) If successful It returns the old value of brk If unsuccessful It returns –1 It sets errno to ENOMEM If incr is zero It returns the current value incr can be a negative number
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7 1 #include "csapp.h" 2 #define MAXN 15213 3 4 int array[MAXN]; 5 Why Dynamic Memory Allocation
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