Re: Fiber Local Storage
On Tuesday, 30 July 2013 at 01:45:45 UTC, deadalnix wrote: On Monday, 29 July 2013 at 15:25:49 UTC, Martin Nowak wrote: What do you mean by that, FLS instead of TLS and everything runs as Fiber? Yes, with a scheduler int the runtime. I don't think FLS can be as fast as TLS because the latter benefits from many optimizations due to linker and OS support.
Re: Fiber Local Storage
On Friday, 26 July 2013 at 04:30:18 UTC, Manu wrote: Is there an FLS implementation floating around? If not, it's probably something that should be considered for std.thread. - There is WorkerLocalStorage in std.parallelism Tasks. - Apparently you can easily capture variables in the context of the delegate. - If you use thread affinity when executing Fibers you can access TLS.
Re: Fiber Local Storage
On 07/26/2013 08:06 AM, deadalnix wrote: On Friday, 26 July 2013 at 04:30:18 UTC, Manu wrote: Is there an FLS implementation floating around? If not, it's probably something that should be considered for std.thread. I'd also love to have one ! (in fact I do think it should be the default). What do you mean by that, FLS instead of TLS and everything runs as Fiber?
Re: Fiber Local Storage
On Jul 25, 2013, at 9:29 PM, Manu turkey...@gmail.com wrote: Is there an FLS implementation floating around? If not, it's probably something that should be considered for std.thread. Nope. I'd love to have this, but it's pretty tricky once you include the need for dynamic library support and my time is quite limited these days. As always, pull requests are very welcome :-)
Re: Fiber Local Storage
On Friday, 26 July 2013 at 04:30:18 UTC, Manu wrote: Is there an FLS implementation floating around? If not, it's probably something that should be considered for std.thread. Nice to see this asked. For a simulation library I was developing I was thinking that fiber support had to be done by asking the library user to swap a struct every time a fiber context-switched. If that could be automated then that would be great!
Re: Fiber Local Storage
On Monday, 29 July 2013 at 15:25:49 UTC, Martin Nowak wrote: On 07/26/2013 08:06 AM, deadalnix wrote: On Friday, 26 July 2013 at 04:30:18 UTC, Manu wrote: Is there an FLS implementation floating around? If not, it's probably something that should be considered for std.thread. I'd also love to have one ! (in fact I do think it should be the default). What do you mean by that, FLS instead of TLS and everything runs as Fiber? Yes, with a scheduler int the runtime.
Re: Fiber Local Storage
On Friday, 26 July 2013 at 04:30:18 UTC, Manu wrote: Is there an FLS implementation floating around? If not, it's probably something that should be considered for std.thread. I'd also love to have one ! (in fact I do think it should be the default).
Fiber Local Storage
Is there an FLS implementation floating around? If not, it's probably something that should be considered for std.thread.
Re: Fiber Local Storage
On Friday, 26 July 2013 at 04:30:18 UTC, Manu wrote:
Is there an FLS implementation floating around?
If not, it's probably something that should be considered for
std.thread.
Maybe something like this:
--
private struct FLSEntry
{
void** ptr;
size_t start;
immutable void[] initData;
}
private __gshared FLSEntry[] flsEntries;
private __gshared size_t flsSize;
void registerFLS(void** ptr, immutable void[] initData)
{
enum ALIGN = size_t.sizeof;
auto size = (initData.length + ALIGN-1) % ALIGN;
flsEntries ~= FLSEntry(ptr, flsSize, initData);
flsSize += size;
}
// called by core.thread on fiber creation
void initFLS(Fiber fiber)
{
fiber.fls = new void[flsSize];
void* p = fiber.fls.ptr;
foreach (entry; flsEntries)
with (entry)
p[start..start+initData.length] = initData[];
}
// called by core.thread when switching to a fiber
void switchFLS(Fiber to)
{
void* p = to.fls.ptr;
foreach (entry; flsEntries)
*entry.ptr = p + entry.start;
}
struct FLS(T)
{
shared static this()
{
//registerFLS(data, (T.init)[0..1]);
static immutable T init;
registerFLS(cast(void**)data, (init)[0..1]);
}
static T* data;
alias data this;
}
// ***
struct MyData
{
int i;
}
FLS!MyData fiberData;
--
A linker segment would be better, but not sure how feasible that
would be.
fiber local storage
Not available yet, but Intel announced support for manipulating FS and GS in user mode. Protection for fiber local storage is one use case. http://software.intel.com/file/36945
