Re: question about alien library unloading
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- Subject: Re: question about alien library unloading
- From: Cosmin Apreutesei <cosmin.apreutesei@...>
- Date: 2010年9月24日 12:36:56 +0300
Another (possibly related) bug is this: if you load dll1 and after
that dll2 (regardless if you unload dll1 first) which both export a
function with the same name, only dll1.func() gets called even if I
try dll2.func().
Test case:
require 'alien'
local dll1,dll2='dll1.dll','dll2.dll'
local libs = setmetatable({}, {__mode='k'})
function test(libname,fname,should_be)
local lib = alien.load(libname)
libs[lib] = true
lib[fname]:types{abi='stdcall',ret=i}
print(lib, fname..'() -> ', lib[fname](),'should be',should_be)
alien.loaded[libname] = nil
collectgarbage('collect')
end
test('dll1.dll','test',1)
test('dll2.dll','test',2)
test('dll1.dll','test1',1)
test('dll2.dll','test2',2)
print(next(libs) and 'libs still hanging' or 'all libs garbage-collected')
for lib in pairs(libs) do
print('',lib)
end
Output:
>lua "test_dll2.lua"
alien library dll1.dll test() -> 1 should be 1
alien library dll2.dll test() -> 1 should be 2
alien library dll1.dll test1() -> 1 should be 1
alien library dll2.dll test2() -> 2 should be 2
libs still hanging
alien library ĐBA
alien library dll2.dll
>Exit code: 0 Time: 0.217
For this example you need to build 2 dlls. I did it in Delphi
(freepascal should compile this too in Delphi mode):
----------------------- file dll1.dpr -----------------------
library dll1;
uses
SysUtils,
Classes;
{$R *.res}
function test: integer; stdcall;
begin
result := 1;
end;
function test1: integer; stdcall;
begin
result := 1;
end;
exports
test,
test1;
begin
end.
----------------------- file dll2.dpr -----------------------
library dll2;
uses
SysUtils,
Classes;
{$R *.res}
function test: integer; stdcall;
begin
result := 2;
end;
function test2: integer; stdcall;
begin
result := 2;
end;
exports
test,
test2;
begin
end.