sysio::vm::stack_allocator Class Reference

#include <allocator.hpp>

Public Member Functions
	stack_allocator (std::size_t min_size)
	~stack_allocator ()
void *	top () const
	stack_allocator (std::size_t min_size)
	~stack_allocator ()
void *	top () const

Detailed Description

Definition at line 52 of file allocator.hpp.

Constructor & Destructor Documentation

stack_allocator() [1/2]

sysio::vm::stack_allocator::stack_allocator ( std::size_t min_size )

inlineexplicit

Definition at line 54 of file allocator.hpp.

                                                   {
         if(min_size > 4*1024*1024) {
            std::size_t pagesize = static_cast<std::size_t>(::sysconf(_SC_PAGESIZE));
            _size = ((min_size + pagesize - 1) & ~(pagesize - 1)) + 4*1024*1024;
            int flags = MAP_PRIVATE | MAP_ANONYMOUS;
#ifdef MAP_STACK
            flags |= MAP_STACK;
#endif
            _ptr = ::mmap(nullptr, _size, PROT_READ | PROT_WRITE, flags, -1, 0);
         }
      }

~stack_allocator() [1/2]

sysio::vm::stack_allocator::~stack_allocator ( )

inline

Definition at line 65 of file allocator.hpp.

                         {
         if(_ptr) {
            ::munmap(_ptr, _size);
         }
      }

stack_allocator() [2/2]

sysio::vm::stack_allocator::stack_allocator ( std::size_t min_size )

inlineexplicit

Definition at line 54 of file allocator.hpp.

                                                   {
         if(min_size > 4*1024*1024) {
            std::size_t pagesize = static_cast<std::size_t>(::sysconf(_SC_PAGESIZE));
            _size = ((min_size + pagesize - 1) & ~(pagesize - 1)) + 4*1024*1024;
            int flags = MAP_PRIVATE | MAP_ANONYMOUS;
#ifdef MAP_STACK
            flags |= MAP_STACK;
#endif
            _ptr = ::mmap(nullptr, _size, PROT_READ | PROT_WRITE, flags, -1, 0);
         }
      }

~stack_allocator() [2/2]

sysio::vm::stack_allocator::~stack_allocator ( )

inline

Definition at line 65 of file allocator.hpp.

                         {
         if(_ptr) {
            ::munmap(_ptr, _size);
         }
      }

Member Function Documentation

top() [1/2]

void * sysio::vm::stack_allocator::top ( ) const

inline

Definition at line 70 of file allocator.hpp.

                        {
         if(_ptr) {
            return static_cast<char*>(_ptr) + _size;
         } else {
            return nullptr;
         }
      }

Here is the caller graph for this function:

top() [2/2]

void * sysio::vm::stack_allocator::top ( ) const

inline

Definition at line 70 of file allocator.hpp.

                        {
         if(_ptr) {
            return static_cast<char*>(_ptr) + _size;
         } else {
            return nullptr;
         }
      }

---

The documentation for this class was generated from the following files:

• libraries/sys-vm/include/sysio/sysio/vm/allocator.hpp
• libraries/sys-vm/include/sysio/vm/allocator.hpp