aspects on methods?

[jj75607 via Digitalmars-d-learn]

I want to use aspect-like annotations to transform

  @Lockable
  class Abc
  {
  @sync
  void f() {
  writeln("f");
  }

  @shared
  void g() {
  writeln("g");
  }
  }

to something like:

  class Abc
  {
  shared(ReadWriteMutex) _lock123;

  this()
  {
  _lock123 = cast(shared)(new ReadWriteMutex());
  }

  void f() {
  synchronized((cast()_lock123).writer) {
  writeln("f");
  }
  }

  void g() {
  synchronized((cast()_lock123).reader) {
  writeln("g");
  }
  }
  }

How can I do that?

some atomic structs

[jj75607 via Digitalmars-d-learn]

I wrote some java-like atomic structs. Please criticize it
https://dpaste.dzfl.pl/24f1438ebb52

thread-safe shared field access

[jj75607 via Digitalmars-d-learn]

For example I have a shared from different threads variable. What 
piece of code is correctly thread-safe?


First:
  shared class A
  {
  shared(int) x;

  void test1()
  {
  x = 10;
  x += 5
  writeln(x);
  }
  }

Or second:
  import core.atomic;
  shared class A
  {
  shared(int) x;

  void test1()
  {
  atomicStore(x, 10);
  atomicOp!("+=")(x, 5);
  writeln(atomicLoad(x));
  }
  }

Re: compilation error with shared ReadWriteMutex

[jj75607 via Digitalmars-d-learn]

On Thursday, 30 June 2016 at 12:25:54 UTC, Steven Schveighoffer 
wrote:

On 6/30/16 8:18 AM, jj75607 wrote:

  [...]


You don't need to mark this shared, because the entire class is 
shared, all members are implicitly marked shared.


[...]


Thanks! Is this a compilation only 'cast' with no runtime works?

Re: opEquals on shared object

[jj75607 via Digitalmars-d-learn]

On Thursday, 30 June 2016 at 12:21:03 UTC, Steven Schveighoffer 
wrote:

On 6/30/16 6:26 AM, jj75607 wrote:

Hello!

I need to overload opEquals on shared class C

shared class C
{
override bool opEquals(Object o) { return false; }
}

But compilation fails with the message:
Error: function f700.C.opEquals does not override any 
function, did you

mean to override 'object.Object.opEquals'?

What am I doing wrong?


Object.opEquals is not marked shared. You can't override a 
non-shared method with a shared one.


You need to remove override.

But... unfortunately, this may not work in practice. The 
opEquals handling for objects is pretty much screwed unless you 
have unshared mutable objects. I think it may work for const 
objects, but not in a good way.


-Steve


Thanks!

But what should I do to fix that code?

shared class C
{
bool opEquals(Object o) { return false; }
}

class A(T)
{
void f(T a, T b)
{
if(a == b)
writeln("equals");
else
writeln("non equals");
}
}


int main(string[] argv)
{
auto a1 = new A!int;
a1.f(1,2);

auto a2 = new A!(shared(C));
shared C c = new shared(C);
a2.f(c,c);


return 0;
}

It fails with
Error: none of the overloads of 'opEquals' are callable using 
argument types (shared(C), shared(C))

compilation error with shared ReadWriteMutex

[jj75607 via Digitalmars-d-learn]

I wrote shared class with rwmutex

  import core.sync.rwmutex;
  shared class Shared
  {
  ReadWriteMutex rwmutex;
  int[] items;

  this()
  {
  rwmutex = new ReadWriteMutex();
  }
  }

But it fails with:

  Error: cannot implicitly convert expression (new 
ReadWriteMutex(cast(Policy)1)) of type 
core.sync.rwmutex.ReadWriteMutex to shared(ReadWriteMutex)


I add `shared' keyword to the `rwmutex' variable

  shared class Shared
  {
  shared(ReadWriteMutex) rwmutex;
  int[] items;

  this()
  {
  rwmutex = new shared(ReadWriteMutex)();
  }
  }

And got another compilation error:

  Error: non-shared method core.sync.rwmutex.ReadWriteMutex.this 
is not callable using a shared object


How can I use shared class with mutex correctly?

opEquals on shared object

[jj75607 via Digitalmars-d-learn]

Hello!

I need to overload opEquals on shared class C

shared class C
{
override bool opEquals(Object o) { return false; }
}

But compilation fails with the message:
Error: function f700.C.opEquals does not override any function, 
did you mean to override 'object.Object.opEquals'?


What am I doing wrong?

Re: multithreading profiling

[jj75607 via Digitalmars-d-learn]

On Monday, 18 April 2016 at 13:45:20 UTC, Marc Schütz wrote:

Which platform/OS, dmd version, and command line are you using?


Windows7, DMD 2.071.0, run from Visual Studio 2013 Community + 
VisualD 0.3.43

multithreading profiling

[jj75607 via Digitalmars-d-learn]

Hello!

Is it possible to start profiling on multithreaded app with Dmd?

https://issues.dlang.org/show_bug.cgi?id=14511 is open. I am 
doing wrong or why this program segfaults if compiled with 
profiler hooks?


import core.atomic;

shared struct S
{   
uint counter;

bool inc() shared
{
atomicOp!("+=")(counter, 1);
return true;
}
}

int main(string[] argv)
{
S s;

return 0;
}

Thank you!