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37 * Implements functions in mempool.h.
39 * \author Teemu Murtola <teemu.murtola@gmail.com>
40 * \ingroup module_selection
50 #include "gromacs/selection/indexutil.h"
51 #include "gromacs/utility/exceptions.h"
52 #include "gromacs/utility/gmxassert.h"
53 #include "gromacs/utility/smalloc.h"
55 //! Alignment in bytes for all returned blocks.
59 * Describes a single block allocated from the memory pool.
61 typedef struct gmx_sel_mempool_block_t
63 //! Pointer to the start of the block (as returned to the user).
65 //! Size of the block, including padding required to align next block.
67 } gmx_sel_mempool_block_t
;
70 * Describes a memory pool.
72 struct gmx_sel_mempool_t
74 //! Number of bytes currently allocated from the pool.
76 //! Number of bytes free in the pool, or 0 if \a buffer is NULL.
78 //! Memory area allocated for the pool, or NULL if not yet reserved.
80 //! Pointer to the first free byte (aligned at ::ALIGN_STEP) in \a buffer.
82 //! Number of blocks allocated from the pool.
84 //! Array describing the allocated blocks.
85 gmx_sel_mempool_block_t
*blockstack
;
86 //! Number of elements allocated for the \a blockstack array.
87 int blockstack_nalloc
;
89 * Maximum number of bytes that have been reserved from the pool
96 _gmx_sel_mempool_create()
98 gmx_sel_mempool_t
*mp
;
106 mp
->blockstack
= NULL
;
107 mp
->blockstack_nalloc
= 0;
113 _gmx_sel_mempool_destroy(gmx_sel_mempool_t
*mp
)
119 for (i
= 0; i
< mp
->nblocks
; ++i
)
121 sfree(mp
->blockstack
[i
].ptr
);
125 sfree(mp
->blockstack
);
130 _gmx_sel_mempool_alloc(gmx_sel_mempool_t
*mp
, size_t size
)
135 size_walign
= ((size
+ ALIGN_STEP
- 1) / ALIGN_STEP
) * ALIGN_STEP
;
138 if (mp
->freesize
< size
)
140 GMX_THROW(gmx::InternalError("Out of memory pool memory"));
143 mp
->freeptr
+= size_walign
;
144 mp
->freesize
-= size_walign
;
145 mp
->currsize
+= size_walign
;
152 throw std::bad_alloc();
154 mp
->currsize
+= size_walign
;
155 if (mp
->currsize
> mp
->maxsize
)
157 mp
->maxsize
= mp
->currsize
;
161 if (mp
->nblocks
>= mp
->blockstack_nalloc
)
163 mp
->blockstack_nalloc
= mp
->nblocks
+ 10;
164 srenew(mp
->blockstack
, mp
->blockstack_nalloc
);
166 mp
->blockstack
[mp
->nblocks
].ptr
= ptr
;
167 mp
->blockstack
[mp
->nblocks
].size
= size_walign
;
174 _gmx_sel_mempool_free(gmx_sel_mempool_t
*mp
, void *ptr
)
182 GMX_RELEASE_ASSERT(mp
->nblocks
> 0 && mp
->blockstack
[mp
->nblocks
- 1].ptr
== ptr
,
183 "Invalid order of memory pool free calls");
185 size
= mp
->blockstack
[mp
->nblocks
].size
;
186 mp
->currsize
-= size
;
189 mp
->freeptr
= (char *)ptr
;
190 mp
->freesize
+= size
;
199 _gmx_sel_mempool_reserve(gmx_sel_mempool_t
*mp
, size_t size
)
201 GMX_RELEASE_ASSERT(mp
->nblocks
== 0,
202 "Cannot reserve memory pool when there is something allocated");
203 GMX_RELEASE_ASSERT(!mp
->buffer
, "Cannot reserve memory pool twice");
208 mp
->buffer
= (char *)malloc(size
);
211 throw std::bad_alloc();
214 mp
->freeptr
= mp
->buffer
;
218 _gmx_sel_mempool_alloc_group(gmx_sel_mempool_t
*mp
, gmx_ana_index_t
*g
,
221 void *ptr
= _gmx_sel_mempool_alloc(mp
, sizeof(*g
->index
)*isize
);
222 g
->index
= static_cast<int *>(ptr
);
226 _gmx_sel_mempool_free_group(gmx_sel_mempool_t
*mp
, gmx_ana_index_t
*g
)
228 _gmx_sel_mempool_free(mp
, g
->index
);