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/* alloc.c (dynamic memory allocation) */
/***********************************************************************
* This code is part of GLPK (GNU Linear Programming Kit).
*
* Copyright (C) 2000-2013 Andrew Makhorin, Department for Applied
* Informatics, Moscow Aviation Institute, Moscow, Russia. All rights
* reserved. E-mail: <mao@gnu.org>.
*
* GLPK is free software: you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* GLPK is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
* License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GLPK. If not, see <http://www.gnu.org/licenses/>.
***********************************************************************/
#include "env.h"
#define ALIGN 16
/* some processors need data to be properly aligned, so this macro
* defines the alignment boundary, in bytes, provided by glpk memory
* allocation routines; looks like 16-byte alignment boundary is
* sufficient for all 32- and 64-bit platforms (8-byte boundary is not
* sufficient for some 64-bit platforms because of jmp_buf) */
#define MBD_SIZE (((sizeof(MBD) + (ALIGN - 1)) / ALIGN) * ALIGN)
/* size of memory block descriptor, in bytes, rounded up to multiple
* of the alignment boundary */
/***********************************************************************
* dma - dynamic memory allocation (basic routine)
*
* This routine performs dynamic memory allocation. It is similar to
* the standard realloc function, however, it provides every allocated
* memory block with a descriptor, which is used for sanity checks on
* reallocating/freeing previously allocated memory blocks as well as
* for book-keeping the memory usage statistics. */
static void *dma(const char *func, void *ptr, size_t size)
{ ENV *env = get_env_ptr();
MBD *mbd;
if (ptr == NULL)
{ /* new memory block will be allocated */
mbd = NULL;
}
else
{ /* allocated memory block will be reallocated or freed */
/* get pointer to the block descriptor */
mbd = (MBD *)((char *)ptr - MBD_SIZE);
/* make sure that the block descriptor is valid */
if (mbd->self != mbd)
xerror("%s: ptr = %p; invalid pointer\n", func, ptr);
/* remove the block from the linked list */
mbd->self = NULL;
if (mbd->prev == NULL)
env->mem_ptr = mbd->next;
else
mbd->prev->next = mbd->next;
if (mbd->next == NULL)
;
else
mbd->next->prev = mbd->prev;
/* decrease usage counts */
if (!(env->mem_count >= 1 && env->mem_total >= mbd->size))
xerror("%s: memory allocation error\n", func);
env->mem_count--;
env->mem_total -= mbd->size;
if (size == 0)
{ /* free the memory block */
free(mbd);
return NULL;
}
}
/* allocate/reallocate memory block */
if (size > SIZE_T_MAX - MBD_SIZE)
xerror("%s: block too large\n", func);
size += MBD_SIZE;
if (size > env->mem_limit - env->mem_total)
xerror("%s: memory allocation limit exceeded\n", func);
if (env->mem_count == INT_MAX)
xerror("%s: too many memory blocks allocated\n", func);
mbd = (mbd == NULL ? malloc(size) : realloc(mbd, size));
if (mbd == NULL)
xerror("%s: no memory available\n", func);
/* setup the block descriptor */
mbd->size = size;
mbd->self = mbd;
mbd->prev = NULL;
mbd->next = env->mem_ptr;
/* add the block to the beginning of the linked list */
if (mbd->next != NULL)
mbd->next->prev = mbd;
env->mem_ptr = mbd;
/* increase usage counts */
env->mem_count++;
if (env->mem_cpeak < env->mem_count)
env->mem_cpeak = env->mem_count;
env->mem_total += size;
if (env->mem_tpeak < env->mem_total)
env->mem_tpeak = env->mem_total;
return (char *)mbd + MBD_SIZE;
}
/***********************************************************************
* NAME
*
* glp_alloc - allocate memory block
*
* SYNOPSIS
*
* void *glp_alloc(int n, int size);
*
* DESCRIPTION
*
* The routine glp_alloc allocates a memory block of n * size bytes
* long.
*
* Note that being allocated the memory block contains arbitrary data
* (not binary zeros!).
*
* RETURNS
*
* The routine glp_alloc returns a pointer to the block allocated.
* To free this block the routine glp_free (not free!) must be used. */
void *glp_alloc(int n, int size)
{ if (n < 1)
xerror("glp_alloc: n = %d; invalid parameter\n", n);
if (size < 1)
xerror("glp_alloc: size = %d; invalid parameter\n", size);
if ((size_t)n > SIZE_T_MAX / (size_t)size)
xerror("glp_alloc: n = %d, size = %d; block too large\n",
n, size);
return dma("glp_alloc", NULL, (size_t)n * (size_t)size);
}
/**********************************************************************/
void *glp_realloc(void *ptr, int n, int size)
{ /* reallocate memory block */
if (ptr == NULL)
xerror("glp_realloc: ptr = %p; invalid pointer\n", ptr);
if (n < 1)
xerror("glp_realloc: n = %d; invalid parameter\n", n);
if (size < 1)
xerror("glp_realloc: size = %d; invalid parameter\n", size);
if ((size_t)n > SIZE_T_MAX / (size_t)size)
xerror("glp_realloc: n = %d, size = %d; block too large\n",
n, size);
return dma("glp_realloc", ptr, (size_t)n * (size_t)size);
}
/***********************************************************************
* NAME
*
* glp_free - free (deallocate) memory block
*
* SYNOPSIS
*
* void glp_free(void *ptr);
*
* DESCRIPTION
*
* The routine glp_free frees (deallocates) a memory block pointed to
* by ptr, which was previuosly allocated by the routine glp_alloc or
* reallocated by the routine glp_realloc. */
void glp_free(void *ptr)
{ if (ptr == NULL)
xerror("glp_free: ptr = %p; invalid pointer\n", ptr);
dma("glp_free", ptr, 0);
return;
}
/***********************************************************************
* NAME
*
* glp_mem_limit - set memory usage limit
*
* SYNOPSIS
*
* void glp_mem_limit(int limit);
*
* DESCRIPTION
*
* The routine glp_mem_limit limits the amount of memory available for
* dynamic allocation (in GLPK routines) to limit megabytes. */
void glp_mem_limit(int limit)
{ ENV *env = get_env_ptr();
if (limit < 1)
xerror("glp_mem_limit: limit = %d; invalid parameter\n",
limit);
if ((size_t)limit <= (SIZE_T_MAX >> 20))
env->mem_limit = (size_t)limit << 20;
else
env->mem_limit = SIZE_T_MAX;
return;
}
/***********************************************************************
* NAME
*
* glp_mem_usage - get memory usage information
*
* SYNOPSIS
*
* void glp_mem_usage(int *count, int *cpeak, size_t *total,
* size_t *tpeak);
*
* DESCRIPTION
*
* The routine glp_mem_usage reports some information about utilization
* of the memory by GLPK routines. Information is stored to locations
* specified by corresponding parameters (see below). Any parameter can
* be specified as NULL, in which case its value is not stored.
*
* *count is the number of the memory blocks currently allocated by the
* routines glp_malloc and glp_calloc (one call to glp_malloc or
* glp_calloc results in allocating one memory block).
*
* *cpeak is the peak value of *count reached since the initialization
* of the GLPK library environment.
*
* *total is the total amount, in bytes, of the memory blocks currently
* allocated by the routines glp_malloc and glp_calloc.
*
* *tpeak is the peak value of *total reached since the initialization
* of the GLPK library envirionment. */
void glp_mem_usage(int *count, int *cpeak, size_t *total,
size_t *tpeak)
{ ENV *env = get_env_ptr();
if (count != NULL)
*count = env->mem_count;
if (cpeak != NULL)
*cpeak = env->mem_cpeak;
if (total != NULL)
*total = env->mem_total;
if (tpeak != NULL)
*tpeak = env->mem_tpeak;
return;
}
/* eof */
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