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mem.h
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1 /* -*- mode: C; c-basic-offset: 4 -*- */
2 /* ex: set shiftwidth=4 tabstop=4 expandtab: */
3 /*
4  * Copyright (c) 2010-2012, Georgia Tech Research Corporation
5  * All rights reserved.
6  *
7  * Author(s): Neil T. Dantam <ntd@gatech.edu>
8  * Georgia Tech Humanoid Robotics Lab
9  * Under Direction of Prof. Mike Stilman <mstilman@cc.gatech.edu>
10  *
11  *
12  * This file is provided under the following "BSD-style" License:
13  *
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42 
43 #ifndef AA_MEM_H
44 #define AA_MEM_H
45 
51 #ifndef AA_ALLOC_STACK_MAX
52 #define AA_ALLOC_STACK_MAX (4096-64)
54 #endif //AA_ALLOC_STACK_MAX
55 
56 
57 enum aa_mem_refop {
58  /* Make a private copy */
59  AA_MEM_COPY,
60  /* Use the existing copy. Someone else will clean up */
61  AA_MEM_BORROW,
62  /* Take the reference and cleanup when we're done */
63  AA_MEM_STEAL
64 };
65 
66 /**************/
67 /* Allocation */
68 /**************/
69 
70 /*----------- General Allocation ------------------*/
71 
72 /* FIXME: we should do something reasonable when malloc() fails, but
73  since Linux lies about whether it can provide memory, there may be
74  no point. */
75 
77 static inline void *aa_malloc0( size_t size ) {
78  void *p = malloc(size);
79  if(p) memset(p,0,size);
80  return p;
81 }
82 
83 
85 static inline void aa_free_if_valid( void *ptr ) {
86  if( NULL != ptr ) free(ptr);
87 }
88 
90 #define AA_NEW_AR(type,n) ( (type*) malloc(sizeof(type)*(n)) )
91 
93 #define AA_NEW0_AR(type,n) ( (type*) aa_malloc0(sizeof(type)*(n)) )
94 
96 #define AA_NEW(type) AA_NEW_AR(type,1)
97 
99 #define AA_NEW0(type) AA_NEW0_AR(type,1)
100 
103 #define AA_ALIGN2( val, align ) (((val) + (align) - 1) & ~(align-1))
104 
105 static inline void aa_checked_free( void * ptr )
106 {
107  if( ptr ) free(ptr);
108 }
109 
110 /*----------- Local Allocation ------------------*/
111 
124 #define AA_ALLOCAL(size) ({ size_t aa_$_allocal_size = (size); \
125  aa_$_allocal_size > AA_ALLOC_STACK_MAX ? \
126  malloc(aa_$_allocal_size) : alloca(aa_$_allocal_size); })
127 
132 #define AA_NEW_LOCAL(type, n) ( (type*) AA_ALLOCAL( sizeof(type)*(n) ) )
133 
139 static inline void aa_frlocal( void *ptr, size_t size ) {
140  if( size > AA_ALLOC_STACK_MAX) free(ptr);
141 }
142 
144 #define AA_DEL_LOCAL(ptr, type, n) aa_frlocal( ptr, sizeof(type)*(n) )
145 
147 typedef struct {
148  size_t n;
149  union {
150  uint64_t dalign;
151  uint8_t d[1];
152  };
153 } aa_flexbuf_t;
154 
159 
160 /*----------- Region Allocation ------------------*/
161 
163 #define AA_MEMREG_ALIGN 16
164 
170  //size_t n; ///< size of this chunk
171  uint8_t *end;
173  uint8_t d[];
174 };
175 
198 typedef struct aa_mem_region {
199  uint8_t *head;
202 
204 AA_API void aa_mem_region_init( aa_mem_region_t *region, size_t size );
205 
209 
210 
215 
220 AA_API void *aa_mem_region_tmpalloc( aa_mem_region_t *region, size_t size );
221 
226 AA_API void *aa_mem_region_alloc( aa_mem_region_t *region, size_t size );
227 
230 AA_API void *aa_mem_region_tmprealloc( aa_mem_region_t *region, size_t size );
231 
234 AA_API void *aa_mem_region_dup( aa_mem_region_t *region, const void *p, size_t size );
235 
236 
241 
244 AA_API char *aa_mem_region_printf( aa_mem_region_t *region, const char *fmt, ... );
245 
248 AA_API char* aa_mem_region_vprintf(aa_mem_region_t *reg, const char *fmt, va_list ap );
249 
252 AA_API void aa_mem_region_pop( aa_mem_region_t *region, void *ptr );
253 
254 
257 AA_API void *aa_mem_region_ptr( aa_mem_region_t *region );
258 
262 
266 
267 
272 AA_API void aa_mem_region_local_init( size_t size );
273 
279 
283 
288 AA_API void *aa_mem_region_local_alloc( size_t size );
289 
294 AA_API void *aa_mem_region_local_tmpalloc( size_t size );
295 
300 AA_API void aa_mem_region_local_pop( void *ptr );
301 
307 
308 
312 #define AA_MEM_REGION_NEW( reg, type ) ( (type*) aa_mem_region_alloc((reg), sizeof(type)) )
313 
317 #define AA_MEM_REGION_NEW_CPY( reg, src, type ) ( (type*) aa_mem_region_dup((reg), (src), sizeof(type)) )
318 
322 #define AA_MEM_REGION_NEW_N( reg, type, n ) ( (type*) aa_mem_region_alloc((reg), (n)*sizeof(type)) )
323 
327 #define AA_MEM_REGION_LOCAL_NEW( type ) ( (type*) aa_mem_region_local_alloc( sizeof(type)) )
328 
332 #define AA_MEM_REGION_LOCAL_NEW_N( type, n ) ( (type*) aa_mem_region_local_alloc( (n)*sizeof(type)) )
333 
334 /*----------- Pooled Allocation ------------------*/
335 
344 typedef struct {
345  size_t size;
346  void *top;
348 } aa_mem_pool_t;
349 
351 AA_API void aa_mem_pool_init( aa_mem_pool_t *pool, size_t size, size_t count );
355 AA_API void *aa_mem_pool_alloc( aa_mem_pool_t *pool );
357 AA_API void aa_mem_pool_free( aa_mem_pool_t *pool, void *ptr );
360 
361 /*----------- Circular Buffers ------------------*/
365 typedef struct {
366  void *buf;
367  size_t n;
368  size_t start;
369  size_t end;
370 } aa_circbuf_t;
371 
373 AA_API void aa_circbuf_create( aa_circbuf_t *cb, size_t n );
375 AA_API void aa_circbuf_destroy( aa_circbuf_t *cb, size_t n );
377 AA_API void aa_circbuf_realloc( aa_circbuf_t *cb, size_t n );
379 AA_API size_t aa_circbuf_space( aa_circbuf_t *cb );
381 AA_API size_t aa_circbuf_used( aa_circbuf_t *cb );
383 AA_API void aa_circbuf_put( aa_circbuf_t *cb, void *buf, size_t n );
385 AA_API int aa_circbuf_read( aa_circbuf_t *cb, int fd, size_t n );
387 AA_API int aa_circbuf_write( aa_circbuf_t *cb, int fd, size_t n );
388 
389 
390 /***************/
391 /* Linked List */
392 /***************/
393 
396 typedef struct aa_mem_cons {
397  void *data;
398  struct aa_mem_cons *next;
399 } aa_mem_cons_t;
400 
407 typedef struct aa_mem_rlist {
408  struct aa_mem_region *reg;
409  struct aa_mem_cons *head;
410  struct aa_mem_cons **tailp;
412 
418 AA_API struct aa_mem_rlist *
419 aa_mem_rlist_alloc( struct aa_mem_region *reg );
420 
422 AA_API void
423 aa_mem_rlist_push_cpy( struct aa_mem_rlist *list, void *p, size_t n );
424 
426 AA_API void
427 aa_mem_rlist_push_ptr( struct aa_mem_rlist *list, void *p );
428 
430 AA_API void
431 aa_mem_rlist_enqueue_cpy( struct aa_mem_rlist *list, void *p, size_t n );
432 
434 AA_API void
435 aa_mem_rlist_enqueue_ptr( struct aa_mem_rlist *list, void *p );
436 
442 AA_API void *aa_mem_rlist_pop( struct aa_mem_rlist *list );
443 
444 #define AA_RLIST_DEF( element_type, list_type ) \
445  typedef struct { \
446  aa_mem_rlist_t rlist; \
447  } list_type; \
448  static inline list_type* \
449  list_type ## _alloc( aa_mem_region *reg ) \
450  { \
451  return (list_type*)aa_mem_rlist_alloc(reg); \
452  }
453 
454 /**********/
455 /* Arrays */
456 /**********/
457 
462 #define AA_MEM_CPY(dst, src, n_elem) \
463  { \
464  /* _Static_assert(sizeof(*dst) == sizeof(*src));*/ \
465  memcpy( (dst), (src), sizeof((dst)[0])*(n_elem) ); \
466  }
467 
470 static inline void *aa_mem_dup( const void *src, size_t size )
471 {
472  void *dst = malloc(size);
473  memcpy(dst,src,size);
474  return dst;
475 }
476 
480 #define AA_MEM_DUP( type, src, count ) \
481  (type*)aa_mem_dup( (src), sizeof(type)*(count) );
482 
483 #define AA_MEM_DUPOP( refop, type, const_dst, dst_data, src, n_elem ) \
484  switch(refop) { \
485  case AA_MEM_COPY: \
486  dst_data = AA_MEM_DUP(type, src, n_elem); \
487  const_dst = dst_data; \
488  break; \
489  case AA_MEM_STEAL: \
490  dst_data = src; \
491  const_dst = dst_data; \
492  break; \
493  case AA_MEM_BORROW: \
494  dst_data = NULL; \
495  const_dst = src; \
496  break; \
497  };
498 
499 
500 
505 #define AA_MEM_SET(dst, val, n_elem) \
506  { \
507  for( size_t aa_$_set_i = 0; \
508  aa_$_set_i < (n_elem); \
509  aa_$_set_i++ ) \
510  (dst)[aa_$_set_i] = (val); \
511  }
512 
517 #define AA_MEM_ZERO(dst, n_elem) (memset((dst),0,(n_elem)*sizeof(*(dst))))
518 
520 #define AA_FAR(...) ((double[]){__VA_ARGS__})
521 
523 static inline void aa_fcpy( double *dst, const double *src, size_t n ) AA_DEPRECATED;
524 static inline void aa_fcpy( double *dst, const double *src, size_t n ) {
525  AA_MEM_CPY( dst, src, n );
526 }
527 
529 static inline void aa_fset( double *dst, double val, size_t n ) AA_DEPRECATED;
530 static inline void aa_fset( double *dst, double val, size_t n ) {
531  AA_MEM_SET( dst, val, n );
532 }
533 
535 static inline void aa_zero( void *p, size_t n ) AA_DEPRECATED;
536 static inline void aa_zero( void *p, size_t n ) {
537  memset(p,0,n);
538 }
539 
541 static inline void aa_fzero( double *p, size_t n ) AA_DEPRECATED;
542 static inline void aa_fzero( double *p, size_t n ) {
543  AA_MEM_SET( p, 0, n );
544 }
545 
547 #define AA_ZERO_AR( var ) aa_zero( var, sizeof(var) )
548 
550 #define AA_SET_AR( var, val ) \
551  for( size_t aa_$_set_ar_i = 0; \
552  aa_$_set_ar_i < sizeof(var)/sizeof(var[0]); \
553  aa_$_set_ar_i ++ ) var[aa_$_set_ar_i] = val;
554 
555 
556 /**************/
557 /* Bit Array */
558 /**************/
559 
561 typedef int aa_bits;
562 
564 #define AA_BITS_BITS (8*sizeof(aa_bits))
565 
567 static inline size_t
568 aa_bits_words( size_t n )
569 {
570  size_t words = n / AA_BITS_BITS;
571  if( words*sizeof(aa_bits)*8 < n ) words++;
572  return words;
573 }
574 
576 static inline size_t
577 aa_bits_size( size_t n_bits )
578 {
579  return aa_bits_words(n_bits) * sizeof(aa_bits);
580 }
581 
582 #define AA_BITS_JK( i, j, k ) \
583  j = (i) / AA_BITS_BITS; \
584  k = (i) - (j)*AA_BITS_BITS;
585 
589 static inline int
590 aa_bits_get( aa_bits *b, size_t i )
591 {
592  size_t j,k;
593  AA_BITS_JK(i,j,k);
594 
595  return (b[j] >> k) & 0x1;
596 }
597 
598 
604 static inline int
605 aa_bits_getn( aa_bits *b, size_t n, size_t i )
606 {
607  if( aa_bits_size(i+1) > n ) return 0;
608  else return aa_bits_get( b, i );
609 }
610 
614 static inline void
615 aa_bits_set( aa_bits *b, size_t i, int val )
616 {
617  size_t j,k;
618  AA_BITS_JK(i,j,k);
619  if( val ) {
620  b[j] |= 0x1<<k;
621  } else {
622  b[j] &= ~ ( 0x1<<k );
623  }
624 }
625 
629 static inline void
630 aa_bits_and( aa_bits *a, const aa_bits *b, size_t n_bits )
631 {
632  size_t n_words = aa_bits_words(n_bits);
633  while( n_words ) {
634  a[n_words] &= b[n_words];
635  }
636 }
637 
641 static inline void
642 aa_bits_or( aa_bits *a, const aa_bits *b, size_t n_bits )
643 {
644  size_t n_words = aa_bits_words(n_bits);
645  while( n_words ) {
646  a[n_words] |= b[n_words];
647  }
648 }
649 
653 static inline void
654 aa_bits_xor( aa_bits *a, const aa_bits *b, size_t n_bits )
655 {
656  size_t n_words = aa_bits_words(n_bits);
657  while( n_words ) {
658  a[n_words] ^= b[n_words];
659  }
660 }
661 
662 
663 /************/
664 /* Swapping */
665 /************/
666 
667 typedef long aa_memswap_type;
668 
670 static inline void aa_memswap( void *AA_RESTRICT a, void *AA_RESTRICT b, size_t size )
671 {
672 
673  // TODO: consider alignment
674  aa_memswap_type *la = (aa_memswap_type*)a, *lb = (aa_memswap_type*)b;
675  for( size_t i = 0; i < size/sizeof(*la); i++ ) {
676  aa_memswap_type tmp = la[i];
677  la[i] = lb[i];
678  lb[i] = tmp;
679  }
680 
681  uint8_t *ca = (uint8_t*)a, *cb = (uint8_t*)b;
682  for( size_t i = size - size%sizeof(*la); i < size; i ++ ) {
683  uint8_t tmp = ca[i];
684  ca[i] = cb[i];
685  cb[i] = tmp;
686  }
687 
688 }
689 
691 #define AA_MEM_SWAP( a, b, n_elem ) (aa_memswap( (a), (b), n_elem*sizeof(*(a)) ))
692 
693 /***********/
694 /* VECTORS */
695 /***********/
696 
709 #define AA_VECTOR_PUSH( max, size, ptr, value ) \
710  if( (size) >= (max) ) { \
711  (max) = 2*(size+1); \
712  (ptr) = (__typeof__(ptr))realloc(ptr,sizeof(*ptr)*max); \
713  } \
714  ptr[(size)++] = (value);
715 
716 #define AA_VECTOR_DEF( element_type, vector_type ) \
717  typedef struct { \
718  size_t max; \
719  size_t size; \
720  element_type *data; \
721  } vector_type; \
722  static inline void vector_type ## _init \
723  ( vector_type *vec, size_t max ) { \
724  vec->data = (element_type*)malloc(max*sizeof(*vec->data)); \
725  vec->max = max; \
726  vec->size = (size_t)0; \
727  }; \
728  static inline void vector_type ## _push \
729  ( vector_type *vec, element_type value ) { \
730  AA_VECTOR_PUSH(vec->max, vec->size, vec->data, value); \
731  };
732 
733 
734 /***********************************/
735 /* Synchronized Reference Counting */
736 /***********************************/
737 
741 AA_API unsigned
742 aa_mem_ref_inc( unsigned *count );
743 
747 AA_API unsigned
748 aa_mem_ref_dec( unsigned *count );
749 
750 #endif //AA_MEM_H
uint8_t * head
pointer to first free element of top chunk
Definition: mem.h:199
AA_API void * aa_mem_rlist_pop(struct aa_mem_rlist *list)
Remove front element of the list and return its data pointer.
AA_API unsigned aa_mem_ref_inc(unsigned *count)
Atomically increment the reference count and return the previous count.
uint64_t dalign
dummy element for alignment
Definition: mem.h:150
A linked list allocated out of a memory region.
Definition: mem.h:407
static int aa_bits_get(aa_bits *b, size_t i)
Return the value of the i'th bit in bitset b.
Definition: mem.h:590
AA_API void * aa_mem_region_alloc(aa_mem_region_t *region, size_t size)
Allocate size bytes from the region.
uint8_t d[]
data array
Definition: mem.h:173
static void aa_fcpy(double *dst, const double *src, size_t n) AA_DEPRECATED
copy n double floats from src to dst
Definition: mem.h:524
static void aa_fset(double *dst, double val, size_t n) AA_DEPRECATED
set n double floats to val
Definition: mem.h:530
AA_API void aa_mem_region_local_destroy(void)
Destroy the thread-local memory region.
A buffer struct.
Definition: mem.h:147
aa_mem_region_t region
memory region to allocate from
Definition: mem.h:347
static void * aa_malloc0(size_t size)
Malloc and zero initialize size bytes.
Definition: mem.h:77
AA_API int aa_circbuf_write(aa_circbuf_t *cb, int fd, size_t n)
untested
AA_API void aa_mem_rlist_push_ptr(struct aa_mem_rlist *list, void *p)
Push the pointer p to the front of the list.
size_t size
size of each element
Definition: mem.h:345
AA_API void aa_mem_region_init(aa_mem_region_t *region, size_t size)
Initialize memory region with an initial chunk of size bytes.
struct aa_mem_region_node * node
linked list of chunks
Definition: mem.h:200
AA_API void aa_mem_pool_init(aa_mem_pool_t *pool, size_t size, size_t count)
untested
static void * aa_mem_dup(const void *src, size_t size)
Copy n octets from src into freshly-allocated heap memory.
Definition: mem.h:470
AA_API char * aa_mem_region_vprintf(aa_mem_region_t *reg, const char *fmt, va_list ap)
printf's into a buffer allocated from region
AA_API void aa_mem_rlist_enqueue_ptr(struct aa_mem_rlist *list, void *p)
Enqueue a the pointer p at the back of the list.
AA_API void * aa_mem_pool_alloc(aa_mem_pool_t *pool)
untested
AA_API void * aa_mem_region_dup(aa_mem_region_t *region, const void *p, size_t size)
Duplicate size bytes at p, allocated out of region.
AA_API char * aa_mem_region_printf(aa_mem_region_t *region, const char *fmt,...)
printf's into a buffer allocated from region
uint8_t * end
pointer to end of this chunk
Definition: mem.h:171
AA_API void aa_mem_rlist_enqueue_cpy(struct aa_mem_rlist *list, void *p, size_t n)
Enqueue a copy of data at p at the back of the list.
struct aa_mem_cons aa_mem_cons_t
A "cons" cell.
static size_t aa_bits_words(size_t n)
Number of aa_bits words to store n bits.
Definition: mem.h:568
static void aa_bits_set(aa_bits *b, size_t i, int val)
Set the value of the i'th bit in bitset b to val.
Definition: mem.h:615
static size_t aa_bits_size(size_t n_bits)
Size of bit vector in octets.
Definition: mem.h:577
AA_API struct aa_mem_rlist * aa_mem_rlist_alloc(struct aa_mem_region *reg)
Allocate rlist out of region.
AA_API void aa_mem_region_local_pop(void *ptr)
Pop ptr from thread-local memory region.
AA_API void aa_circbuf_create(aa_circbuf_t *cb, size_t n)
untested
static void aa_zero(void *p, size_t n) AA_DEPRECATED
set n bytes of p to zero
Definition: mem.h:536
static void aa_memswap(void *AA_RESTRICT a, void *AA_RESTRICT b, size_t size)
Swap size bytes of memory at a and b.
Definition: mem.h:670
Data Structure for Region-Based memory allocation.
Definition: mem.h:198
AA_API aa_mem_region_t * aa_mem_region_local_get(void)
Return pointer to a thread-local memory region.
static void aa_fzero(double *p, size_t n) AA_DEPRECATED
zero array p of length n
Definition: mem.h:542
AA_API void aa_mem_region_release(aa_mem_region_t *region)
Deallocates all allocated objects from the region.
static void aa_bits_xor(aa_bits *a, const aa_bits *b, size_t n_bits)
Compute the bitwise XOR of a and b, storing the result in a.
Definition: mem.h:654
AA_API size_t aa_mem_region_chunk_count(aa_mem_region_t *region)
Number of chunks in the region.
AA_API void aa_mem_region_local_init(size_t size)
Initialize the thread-local memory region.
AA_API void aa_mem_pool_free(aa_mem_pool_t *pool, void *ptr)
untested
AA_API void aa_circbuf_destroy(aa_circbuf_t *cb, size_t n)
untested
void * buf
memory
Definition: mem.h:366
AA_EXTERN const char *aa_verbf_prefix AA_DEPRECATED
don't use
Definition: debug.h:101
Circular buffers use a fixed-size array that acts as if connected end-to end.
Definition: mem.h:365
void * top
top of list of free elements
Definition: mem.h:346
static void aa_bits_and(aa_bits *a, const aa_bits *b, size_t n_bits)
Compute the bitwise AND of a and b, storing the result in a.
Definition: mem.h:630
AA_API void aa_mem_pool_release(aa_mem_pool_t *pool)
untested
AA_API int aa_circbuf_read(aa_circbuf_t *cb, int fd, size_t n)
untested
struct aa_mem_region aa_mem_region_t
Data Structure for Region-Based memory allocation.
int aa_bits
An integer type for bit vectors.
Definition: mem.h:561
#define AA_RESTRICT
Defined restrict keyword based on language flavor.
Definition: amino.h:100
AA_API void * aa_mem_region_ptr(aa_mem_region_t *region)
Pointer to start of free space in region.
AA_API void aa_mem_pool_destroy(aa_mem_pool_t *pool)
untested
AA_API size_t aa_mem_region_freesize(aa_mem_region_t *region)
Number of free contiguous bytes in region.
#define AA_API
calling and name mangling convention for functions
Definition: amino.h:96
AA_API void * aa_mem_region_local_alloc(size_t size)
Allocate from thread-local memory region.
AA_API void aa_circbuf_realloc(aa_circbuf_t *cb, size_t n)
untested
size_t end
end of filled data
Definition: mem.h:369
struct aa_mem_rlist aa_mem_rlist_t
A linked list allocated out of a memory region.
AA_API unsigned aa_mem_ref_dec(unsigned *count)
Atomically decrement the reference count and return the previous count.
AA_API void * aa_mem_region_local_tmpalloc(size_t size)
Temporary allocate from thread-local memory region.
static int aa_bits_getn(aa_bits *b, size_t n, size_t i)
Return the value of the i'th bit in bitset b of size n.
Definition: mem.h:605
#define AA_ALLOC_STACK_MAX
maximum size of objects to stack allocate
Definition: mem.h:53
size_t n
size of buffer
Definition: mem.h:148
AA_API void * aa_mem_region_tmpalloc(aa_mem_region_t *region, size_t size)
Temporary allocation.
AA_API void aa_mem_region_destroy(aa_mem_region_t *region)
Destroy memory region freeing all chunks.
static void aa_frlocal(void *ptr, size_t size)
Free the results of AA_ALLOCAL.
Definition: mem.h:139
AA_API void * aa_mem_region_tmprealloc(aa_mem_region_t *region, size_t size)
Temporary allocation, ensuring that there is enough room for size bytes.
AA_API void aa_flexbuf_free(aa_flexbuf_t *p)
free buffer
AA_API size_t aa_circbuf_used(aa_circbuf_t *cb)
untested
static void aa_bits_or(aa_bits *a, const aa_bits *b, size_t n_bits)
Compute the bitwise OR of a and b, storing the result in a.
Definition: mem.h:642
AA_API size_t aa_circbuf_space(aa_circbuf_t *cb)
untested
Data Structure for Object pools.
Definition: mem.h:344
size_t start
start of filled data
Definition: mem.h:368
AA_API void aa_circbuf_put(aa_circbuf_t *cb, void *buf, size_t n)
untested
A "cons" cell.
Definition: mem.h:396
A single block of memory to be parceled out by the region allocator.
Definition: mem.h:169
AA_API void aa_mem_region_local_release(void)
Release all objects allocated from thread-local memory region.
size_t n
size of the circbuf
Definition: mem.h:367
#define AA_MEM_CPY(dst, src, n_elem)
Copy n_elem elements from src to dst.
Definition: mem.h:462
AA_API aa_flexbuf_t * aa_flexbuf_alloc(size_t n)
allocate buffer of n bytes
AA_API void aa_mem_rlist_push_cpy(struct aa_mem_rlist *list, void *p, size_t n)
Push a copy of data at p to the front of the list.
#define AA_MEM_SET(dst, val, n_elem)
Set n_elem elements at dst to val.
Definition: mem.h:505
static void aa_free_if_valid(void *ptr)
Frees ptr unless NULL == ptr.
Definition: mem.h:85
struct aa_mem_region_node * next
pointer to next chunk node
Definition: mem.h:172
#define AA_BITS_BITS
Number of bits in a aa_bits word.
Definition: mem.h:564
AA_API size_t aa_mem_region_topsize(aa_mem_region_t *region) AA_DEPRECATED
Size of top chunk in region.
AA_API void aa_mem_region_pop(aa_mem_region_t *region, void *ptr)
Deallocates ptr and all blocks allocated after ptr was allocated.