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ircd::buffer: Enable the templated value for unique_buffer alignment.

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This commit is contained in:
Jason Volk 2018-10-18 09:01:25 -07:00
parent 9da3d20e5c
commit 5eacd22866
1 changed files with 29 additions and 35 deletions
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64
include/ircd/buffer/unique_buffer.h
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@ -18,10 +18,11 @@ template<class buffer,
struct ircd::buffer::unique_buffer
:buffer
{
static char *allocate(const size_t &size);
buffer release();
unique_buffer(const size_t &size);
unique_buffer(std::unique_ptr<char[]> &&, const size_t &size);
explicit unique_buffer(const buffer &);
unique_buffer();
unique_buffer(unique_buffer &&) noexcept;
@ -43,53 +44,28 @@ ircd::buffer::unique_buffer<buffer, alignment>::unique_buffer()
template<class buffer,
uint alignment>
ircd::buffer::unique_buffer<buffer, alignment>::unique_buffer(const buffer &src)
:buffer{[&src]() -> buffer
:unique_buffer
{
size(src)
}
{
std::unique_ptr<char[]> ret
{
new __attribute__((aligned(16))) char[size(src)]
};
const mutable_buffer dst
{
ret.get(), size(src)
const_cast<char *>(data(*this)), size(*this)
};
copy(dst, src);
return dst;
}()}
{
}
template<class buffer,
uint alignment>
ircd::buffer::unique_buffer<buffer, alignment>::unique_buffer(const size_t &size)
:unique_buffer<buffer, alignment>
{
std::unique_ptr<char[]>
{
//TODO: Can't use a template parameter to the attribute even though
// it's known at compile time. Hardcoding this until fixed with better
// aligned dynamic memory.
//new __attribute__((aligned(alignment))) char[size]
new __attribute__((aligned(16))) char[size]
},
size
}
{
// Alignment can only be 16 bytes for now
assert(alignment == 16);
}
template<class buffer,
uint alignment>
ircd::buffer::unique_buffer<buffer, alignment>::unique_buffer(std::unique_ptr<char[]> &&b,
const size_t &size)
:buffer
{
typename buffer::iterator(b.release()), size
allocate(size), size
}
{
}
{}
template<class buffer,
uint alignment>
@ -122,7 +98,7 @@ template<class buffer,
ircd::buffer::unique_buffer<buffer, alignment>::~unique_buffer()
noexcept
{
delete[] data(*this);
std::free(const_cast<char *>(data(*this)));
}
template<class buffer,
@ -134,3 +110,21 @@ ircd::buffer::unique_buffer<buffer, alignment>::release()
static_cast<buffer &>(*this) = buffer{};
return ret;
}
template<class buffer,
uint alignment>
char *
ircd::buffer::unique_buffer<buffer, alignment>::allocate(const size_t &size)
{
int errc;
void *ret;
if(unlikely((errc = ::posix_memalign(&ret, alignment, size)) != 0))
throw std::system_error
{
errc, std::system_category()
};
assert(errc == 0);
assert(ret != nullptr);
return reinterpret_cast<char *>(ret);
}