/usr/include/jellyfish/allocators_mmap.hpp is in libjellyfish-2.0-dev 2.2.4-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 | /* This file is part of Jellyfish.
Jellyfish 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.
Jellyfish 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 Jellyfish. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef __JELLYFISH_ALLOCATORS_MMAP_HPP__
#define __JELLYFISH_ALLOCATORS_MMAP_HPP__
#include <sys/types.h>
#include <sys/mman.h>
#include <pthread.h>
#include <stdio.h>
#include <unistd.h>
#include <algorithm>
namespace allocators {
class mmap {
void *ptr_;
size_t size_;
public:
mmap() : ptr_(MAP_FAILED), size_(0) {}
explicit mmap(size_t _size) : ptr_(MAP_FAILED), size_(0) {
realloc(_size);
}
mmap(mmap&& rhs) : ptr_(rhs.ptr_), size_(rhs.size_) {
rhs.ptr_ = MAP_FAILED;
rhs.size_ = 0;
}
~mmap() { free(); }
mmap& operator=(mmap&& rhs) {
swap(rhs);
return *this;
}
void swap(mmap& rhs) {
std::swap(ptr_, rhs.ptr_);
std::swap(size_, rhs.size_);
}
void *get_ptr() const { return ptr_ != MAP_FAILED ? ptr_ : NULL; }
size_t get_size() const { return size_; }
void free();
void *realloc(size_t new_size);
int lock() { return mlock(ptr_, size_); }
int unlock() { return munlock(ptr_, size_); }
// Return a a number of bytes which is a number of whole pages at
// least as large as size.
static size_t round_to_page(size_t _size);
private:
static const int nb_threads = 4;
struct tinfo {
pthread_t thid;
char *start, *end;
size_t pgsize;
};
void fast_zero();
static void * _fast_zero(void *_info);
};
inline void swap(mmap& a, mmap& b) { a.swap(b); }
}
#endif
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