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https://github.com/paboyle/Grid.git
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66 lines
1.0 KiB
C++
66 lines
1.0 KiB
C++
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#include <Grid/Grid.h>
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namespace Grid {
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int PointerCache::victim;
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PointerCache::PointerCacheEntry PointerCache::Entries[PointerCache::Ncache];
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void *PointerCache::Insert(void *ptr,size_t bytes) {
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if (bytes < 4096 ) return NULL;
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#ifdef _OPENMP
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assert(omp_in_parallel()==0);
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#endif
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void * ret = NULL;
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int v = -1;
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for(int e=0;e<Ncache;e++) {
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if ( Entries[e].valid==0 ) {
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v=e;
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break;
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}
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}
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if ( v==-1 ) {
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v=victim;
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victim = (victim+1)%Ncache;
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}
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if ( Entries[v].valid ) {
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ret = Entries[v].address;
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Entries[v].valid = 0;
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Entries[v].address = NULL;
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Entries[v].bytes = 0;
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}
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Entries[v].address=ptr;
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Entries[v].bytes =bytes;
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Entries[v].valid =1;
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return ret;
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}
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void *PointerCache::Lookup(size_t bytes) {
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if (bytes < 4096 ) return NULL;
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#ifdef _OPENMP
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assert(omp_in_parallel()==0);
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#endif
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for(int e=0;e<Ncache;e++){
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if ( Entries[e].valid && ( Entries[e].bytes == bytes ) ) {
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Entries[e].valid = 0;
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return Entries[e].address;
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}
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}
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return NULL;
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}
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}
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