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33 * Implements functions in mempool.h.
35 * \author Teemu Murtola <teemu.murtola@cbr.su.se>
36 * \ingroup module_selection
42 #include "gromacs/legacyheaders/smalloc.h"
44 #include "gromacs/selection/indexutil.h"
45 #include "gromacs/utility/exceptions.h"
46 #include "gromacs/utility/gmxassert.h"
50 //! Alignment in bytes for all returned blocks.
54 * Describes a single block allocated from the memory pool.
56 typedef struct gmx_sel_mempool_block_t
58 //! Pointer to the start of the block (as returned to the user).
60 //! Size of the block, including padding required to align next block.
62 } gmx_sel_mempool_block_t;
65 * Describes a memory pool.
67 struct gmx_sel_mempool_t
69 //! Number of bytes currently allocated from the pool.
71 //! Number of bytes free in the pool, or 0 if \a buffer is NULL.
73 //! Memory area allocated for the pool, or NULL if not yet reserved.
75 //! Pointer to the first free byte (aligned at ::ALIGN_STEP) in \a buffer.
77 //! Number of blocks allocated from the pool.
79 //! Array describing the allocated blocks.
80 gmx_sel_mempool_block_t *blockstack;
81 //! Number of elements allocated for the \a blockstack array.
82 int blockstack_nalloc;
84 * Maximum number of bytes that have been reserved from the pool
91 _gmx_sel_mempool_create()
93 gmx_sel_mempool_t *mp;
101 mp->blockstack = NULL;
102 mp->blockstack_nalloc = 0;
108 _gmx_sel_mempool_destroy(gmx_sel_mempool_t *mp)
114 for (i = 0; i < mp->nblocks; ++i)
116 sfree(mp->blockstack[i].ptr);
120 sfree(mp->blockstack);
125 _gmx_sel_mempool_alloc(gmx_sel_mempool_t *mp, size_t size)
130 size_walign = ((size + ALIGN_STEP - 1) / ALIGN_STEP) * ALIGN_STEP;
133 if (mp->freesize < size)
135 GMX_THROW(gmx::InternalError("Out of memory pool memory"));
138 mp->freeptr += size_walign;
139 mp->freesize -= size_walign;
140 mp->currsize += size_walign;
147 throw std::bad_alloc();
149 mp->currsize += size_walign;
150 if (mp->currsize > mp->maxsize)
152 mp->maxsize = mp->currsize;
156 if (mp->nblocks >= mp->blockstack_nalloc)
158 mp->blockstack_nalloc = mp->nblocks + 10;
159 srenew(mp->blockstack, mp->blockstack_nalloc);
161 mp->blockstack[mp->nblocks].ptr = ptr;
162 mp->blockstack[mp->nblocks].size = size_walign;
169 _gmx_sel_mempool_free(gmx_sel_mempool_t *mp, void *ptr)
177 GMX_RELEASE_ASSERT(mp->nblocks > 0 && mp->blockstack[mp->nblocks - 1].ptr == ptr,
178 "Invalid order of memory pool free calls");
180 size = mp->blockstack[mp->nblocks].size;
181 mp->currsize -= size;
184 mp->freeptr = (char *)ptr;
185 mp->freesize += size;
194 _gmx_sel_mempool_reserve(gmx_sel_mempool_t *mp, size_t size)
196 GMX_RELEASE_ASSERT(mp->nblocks == 0,
197 "Cannot reserve memory pool when there is something allocated");
198 GMX_RELEASE_ASSERT(!mp->buffer, "Cannot reserve memory pool twice");
203 mp->buffer = (char *)malloc(size);
206 throw std::bad_alloc();
209 mp->freeptr = mp->buffer;
213 _gmx_sel_mempool_alloc_group(gmx_sel_mempool_t *mp, gmx_ana_index_t *g,
216 void *ptr = _gmx_sel_mempool_alloc(mp, sizeof(*g->index)*isize);
217 g->index = static_cast<int *>(ptr);
221 _gmx_sel_mempool_free_group(gmx_sel_mempool_t *mp, gmx_ana_index_t *g)
223 _gmx_sel_mempool_free(mp, g->index);