You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
64 lines
1.5 KiB
C++
64 lines
1.5 KiB
C++
2 months ago
|
#ifndef GREENLET_ALLOCATOR_HPP
|
||
|
|
#define GREENLET_ALLOCATOR_HPP
|
||
|
|
|
||
|
|
#define PY_SSIZE_T_CLEAN
|
||
|
|
#include <Python.h>
|
||
|
|
#include <memory>
|
||
|
|
#include "greenlet_compiler_compat.hpp"
|
||
|
|
|
||
|
|
|
||
|
|
namespace greenlet
|
||
|
|
{
|
||
|
|
// This allocator is stateless; all instances are identical.
|
||
|
|
// It can *ONLY* be used when we're sure we're holding the GIL
|
||
|
|
// (Python's allocators require the GIL).
|
||
|
|
template <class T>
|
||
|
|
struct PythonAllocator : public std::allocator<T> {
|
||
|
|
|
||
|
|
PythonAllocator(const PythonAllocator& UNUSED(other))
|
||
|
|
: std::allocator<T>()
|
||
|
|
{
|
||
|
|
}
|
||
|
|
|
||
|
|
PythonAllocator(const std::allocator<T> other)
|
||
|
|
: std::allocator<T>(other)
|
||
|
|
{}
|
||
|
|
|
||
|
|
template <class U>
|
||
|
|
PythonAllocator(const std::allocator<U>& other)
|
||
|
|
: std::allocator<T>(other)
|
||
|
|
{
|
||
|
|
}
|
||
|
|
|
||
|
|
PythonAllocator() : std::allocator<T>() {}
|
||
|
|
|
||
|
|
T* allocate(size_t number_objects, const void* UNUSED(hint)=0)
|
||
|
|
{
|
||
|
|
void* p;
|
||
|
|
if (number_objects == 1)
|
||
|
|
p = PyObject_Malloc(sizeof(T));
|
||
|
|
else
|
||
|
|
p = PyMem_Malloc(sizeof(T) * number_objects);
|
||
|
|
return static_cast<T*>(p);
|
||
|
|
}
|
||
|
|
|
||
|
|
void deallocate(T* t, size_t n)
|
||
|
|
{
|
||
|
|
void* p = t;
|
||
|
|
if (n == 1) {
|
||
|
|
PyObject_Free(p);
|
||
|
|
}
|
||
|
|
else
|
||
|
|
PyMem_Free(p);
|
||
|
|
}
|
||
|
|
// This member is deprecated in C++17 and removed in C++20
|
||
|
|
template< class U >
|
||
|
|
struct rebind {
|
||
|
|
typedef PythonAllocator<U> other;
|
||
|
|
};
|
||
|
|
|
||
|
|
};
|
||
|
|
}
|
||
|
|
|
||
|
|
#endif
|