How can I sync a pinvoke callback in a method?
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I have a native dll written in C. One function is to search for Gateway and return after timeout.
In C codes,it's a synchronous process
search -> callback -> return bool.
So by the time find_gw finished, the gw_found has already been called thus we already have the results. Is there a proper way to sync this so that I can get gwaddr gwname right after find_gw? And I numberred the order it run. gw_found is called inside find_gw synchronously
var gw_found = new FOUND_GW_CALLBACK(callback) //1.new delegate
bool pinvokereturn=GwPInvokes.find_gw(broadcastaddr, timeout, gw_found);//2.pinvoke
//4.How to get gwaddr/gwname here
where
public static bool callback(IntPtr ptr,string gwddr,string gwname)
{
return true; //3.callback
}
c# callback pinvoke
asked Nov 8 at 13:43
joe
232114
|
show 9 more comments
up vote
0
down vote
favorite
I have a native dll written in C. One function is to search for Gateway and return after timeout.
In C codes,it's a synchronous process
search -> callback -> return bool.
So by the time find_gw finished, the gw_found has already been called thus we already have the results. Is there a proper way to sync this so that I can get gwaddr gwname right after find_gw? And I numberred the order it run. gw_found is called inside find_gw synchronously
var gw_found = new FOUND_GW_CALLBACK(callback) //1.new delegate
bool pinvokereturn=GwPInvokes.find_gw(broadcastaddr, timeout, gw_found);//2.pinvoke
//4.How to get gwaddr/gwname here
where
public static bool callback(IntPtr ptr,string gwddr,string gwname)
{
return true; //3.callback
}
c# callback pinvoke
asked Nov 8 at 13:43
joe
232114
ManualResetEventSlim ...var mres = new ManualResetEventSlim(false);in callbackmres.Set()... afterGwPInvokes.find_gwmres.Wait()the code aftermres.Wait()would be called after callback callsmres.Set()
– Selvin
Nov 8 at 13:49
orTaskCompletionSource<Tuple<string, string>>var tsc = new TaskCompletionSource<Tuple<string, string>>();in callbacktsc.SetResult(new Tuple<string,string>(gwddr, gwname);after GwPInvokes.find_gwvar result = await tsc.Task;in result.Item1 would begwddrand in Item2gwname
– Selvin
Nov 8 at 13:57
@Selvin This should work. But I was just wondering if we can do this without using a waithandle or building a task. Because thecallbcakwould be called beforefind_gwreturn. And those public fields are not thread-safe.
– joe
Nov 8 at 14:12
Because the callbcak would be called before find_gw return and ???
– Selvin
Nov 8 at 14:14
So by the time you hit the comment,gwddrandgwnameare already assigned by native code, you don't need to wait.
– joe
Nov 8 at 14:16
|
show 9 more comments
up vote
0
down vote
favorite
up vote
0
down vote
favorite
I have a native dll written in C. One function is to search for Gateway and return after timeout.
In C codes,it's a synchronous process
search -> callback -> return bool.
So by the time find_gw finished, the gw_found has already been called thus we already have the results. Is there a proper way to sync this so that I can get gwaddr gwname right after find_gw? And I numberred the order it run. gw_found is called inside find_gw synchronously
var gw_found = new FOUND_GW_CALLBACK(callback) //1.new delegate
bool pinvokereturn=GwPInvokes.find_gw(broadcastaddr, timeout, gw_found);//2.pinvoke
//4.How to get gwaddr/gwname here
where
public static bool callback(IntPtr ptr,string gwddr,string gwname)
{
return true; //3.callback
}
c# callback pinvoke
asked Nov 8 at 13:43
joe
232114
I have a native dll written in C. One function is to search for Gateway and return after timeout.
In C codes,it's a synchronous process
search -> callback -> return bool.
So by the time find_gw finished, the gw_found has already been called thus we already have the results. Is there a proper way to sync this so that I can get gwaddr gwname right after find_gw? And I numberred the order it run. gw_found is called inside find_gw synchronously
var gw_found = new FOUND_GW_CALLBACK(callback) //1.new delegate
bool pinvokereturn=GwPInvokes.find_gw(broadcastaddr, timeout, gw_found);//2.pinvoke
//4.How to get gwaddr/gwname here
where
public static bool callback(IntPtr ptr,string gwddr,string gwname)
{
return true; //3.callback
}
c# callback pinvoke
c# callback pinvoke
asked Nov 8 at 13:43
joe
232114
asked Nov 8 at 13:43
joe
232114
edited Nov 8 at 14:30
asked Nov 8 at 13:43
joe
232114
asked Nov 8 at 13:43
joe
232114
asked Nov 8 at 13:43
joe
232114
232114
ManualResetEventSlim ...var mres = new ManualResetEventSlim(false);in callbackmres.Set()... afterGwPInvokes.find_gwmres.Wait()the code aftermres.Wait()would be called after callback callsmres.Set()
– Selvin
Nov 8 at 13:49
orTaskCompletionSource<Tuple<string, string>>var tsc = new TaskCompletionSource<Tuple<string, string>>();in callbacktsc.SetResult(new Tuple<string,string>(gwddr, gwname);after GwPInvokes.find_gwvar result = await tsc.Task;in result.Item1 would begwddrand in Item2gwname
– Selvin
Nov 8 at 13:57
@Selvin This should work. But I was just wondering if we can do this without using a waithandle or building a task. Because thecallbcakwould be called beforefind_gwreturn. And those public fields are not thread-safe.
– joe
Nov 8 at 14:12
Because the callbcak would be called before find_gw return and ???
– Selvin
Nov 8 at 14:14
So by the time you hit the comment,gwddrandgwnameare already assigned by native code, you don't need to wait.
– joe
Nov 8 at 14:16
|
show 9 more comments
ManualResetEventSlim ...var mres = new ManualResetEventSlim(false);in callbackmres.Set()... afterGwPInvokes.find_gwmres.Wait()the code aftermres.Wait()would be called after callback callsmres.Set()
– Selvin
Nov 8 at 13:49
orTaskCompletionSource<Tuple<string, string>>var tsc = new TaskCompletionSource<Tuple<string, string>>();in callbacktsc.SetResult(new Tuple<string,string>(gwddr, gwname);after GwPInvokes.find_gwvar result = await tsc.Task;in result.Item1 would begwddrand in Item2gwname
– Selvin
Nov 8 at 13:57
@Selvin This should work. But I was just wondering if we can do this without using a waithandle or building a task. Because thecallbcakwould be called beforefind_gwreturn. And those public fields are not thread-safe.
– joe
Nov 8 at 14:12
Because the callbcak would be called before find_gw return and ???
– Selvin
Nov 8 at 14:14
So by the time you hit the comment,gwddrandgwnameare already assigned by native code, you don't need to wait.
– joe
Nov 8 at 14:16
ManualResetEventSlim ...
var mres = new ManualResetEventSlim(false); in callback mres.Set() ... after GwPInvokes.find_gw mres.Wait() the code after mres.Wait() would be called after callback calls mres.Set()– Selvin
Nov 8 at 13:49
ManualResetEventSlim ...
var mres = new ManualResetEventSlim(false); in callback mres.Set() ... after GwPInvokes.find_gw mres.Wait() the code after mres.Wait() would be called after callback calls mres.Set()– Selvin
Nov 8 at 13:49
or
TaskCompletionSource<Tuple<string, string>> var tsc = new TaskCompletionSource<Tuple<string, string>>(); in callback tsc.SetResult(new Tuple<string,string>(gwddr, gwname); after GwPInvokes.find_gw var result = await tsc.Task; in result.Item1 would be gwddr and in Item2 gwname– Selvin
Nov 8 at 13:57
or
TaskCompletionSource<Tuple<string, string>> var tsc = new TaskCompletionSource<Tuple<string, string>>(); in callback tsc.SetResult(new Tuple<string,string>(gwddr, gwname); after GwPInvokes.find_gw var result = await tsc.Task; in result.Item1 would be gwddr and in Item2 gwname– Selvin
Nov 8 at 13:57
@Selvin This should work. But I was just wondering if we can do this without using a waithandle or building a task. Because the
callbcak would be called before find_gw return. And those public fields are not thread-safe.– joe
Nov 8 at 14:12
@Selvin This should work. But I was just wondering if we can do this without using a waithandle or building a task. Because the
callbcak would be called before find_gw return. And those public fields are not thread-safe.– joe
Nov 8 at 14:12
Because the callbcak would be called before find_gw return and ???
– Selvin
Nov 8 at 14:14
Because the callbcak would be called before find_gw return and ???
– Selvin
Nov 8 at 14:14
So by the time you hit the comment,
gwddr and gwname are already assigned by native code, you don't need to wait.– joe
Nov 8 at 14:16
So by the time you hit the comment,
gwddr and gwname are already assigned by native code, you don't need to wait.– joe
Nov 8 at 14:16
|
show 9 more comments
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ManualResetEventSlim ...
var mres = new ManualResetEventSlim(false);in callbackmres.Set()... afterGwPInvokes.find_gwmres.Wait()the code aftermres.Wait()would be called after callback callsmres.Set()– Selvin
Nov 8 at 13:49
or
TaskCompletionSource<Tuple<string, string>>var tsc = new TaskCompletionSource<Tuple<string, string>>();in callbacktsc.SetResult(new Tuple<string,string>(gwddr, gwname);after GwPInvokes.find_gwvar result = await tsc.Task;in result.Item1 would begwddrand in Item2gwname– Selvin
Nov 8 at 13:57
@Selvin This should work. But I was just wondering if we can do this without using a waithandle or building a task. Because the
callbcakwould be called beforefind_gwreturn. And those public fields are not thread-safe.– joe
Nov 8 at 14:12
Because the callbcak would be called before find_gw return and ???
– Selvin
Nov 8 at 14:14
So by the time you hit the comment,
gwddrandgwnameare already assigned by native code, you don't need to wait.– joe
Nov 8 at 14:16