diff options
Diffstat (limited to 'test/monniaux/glpk-4.65/src/env/alloc.c')
| -rw-r--r-- | test/monniaux/glpk-4.65/src/env/alloc.c | 252 |
1 files changed, 252 insertions, 0 deletions
diff --git a/test/monniaux/glpk-4.65/src/env/alloc.c b/test/monniaux/glpk-4.65/src/env/alloc.c new file mode 100644 index 00000000..8e2d613d --- /dev/null +++ b/test/monniaux/glpk-4.65/src/env/alloc.c @@ -0,0 +1,252 @@ +/* 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 */ |