Multiple Arguments at Thread Launch

[SuperLaserX]

Hi Team, I'm already using TeensyThreads for a project of mine, however, I am attempting to extend the funcionality I already have, but require launching a new thread with multiple arguments. The docs say it supports std::thread-style implementation, however you can't launch it as you would a normal std::thread(func, arg1, arg2, arg3, etc). I've tried to make it work passing my args as a pointer to a struct (void *), but have had absolutely no luck (the thread just never launches). What is the proper way to do this using TeensyThreads?

[ftrias]

Passing the args as a pointer to a struct is the most reliable way to do this. It should work. Can you post some code?

On Thu, Jul 21, 2022 at 1:24 PM SuperLaserX @.***> wrote:

Hi Team, I'm already using TeensyThreads for a project of mine, however, I am attempting to extend the funcionality I already have, but require launching a new thread with multiple arguments. The docs say it supports std::thread-style implementation, however you can't launch it as you would a normal std::thread(func, arg1, arg2, arg3, etc). I've tried to make it work passing my args as a pointer to a struct (void *), but have had absolutely no luck (the thread just never launches). What is the proper way to do this using TeensyThreads?

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[SuperLaserX]

To simplify, I'm just doing something like: `struct a { int b; int c; };

void setup() { a x = malloc(sizeof(a)); a->b = 0; a->c = 1; std::thread z(dostuff, (void )x); z.detach(); }

void dostuff(void args) { a x = (a*)args; println(a->b); println(a->c); }`

I couldn't find any examples that use multiple args on a Teensy, so I got a bit lost.

[ftrias]

First line of dostuff() should be a pointer as shown below. But I suspect it might a typo since you derefence "a" in the other lines.

void dostuff(void *args) { a x = (a)args; println(a->b); println(a->c); }`

Do you get any compile warnings? So if you pass one argument it works, but if you pass a pointer it does not?

On Thu, Jul 21, 2022 at 4:35 PM SuperLaserX @.***> wrote:

To simplify, I'm just doing something like: `struct a { int b; int c; };

void setup() { a x = malloc(sizeof(a)); a->b = 0; a->c = 1; std::thread z(dostuff, (void )x); z.detach(); }

void dostuff(void args) { a x = (a*)args; println(a->b); println(a->c); }`

I couldn't find any examples that use multiple args on a Teensy, so I got a bit lost.

— Reply to this email directly, view it on GitHub https://github.com/ftrias/TeensyThreads/issues/35#issuecomment-1191908145, or unsubscribe https://github.com/notifications/unsubscribe-auth/ABRWXITQNVJ6GONUVQALIITVVGYBBANCNFSM54ING2EA . You are receiving this because you commented.Message ID: @.***>

[SuperLaserX]

I corrected my test app (since I hadn't built it before, I wrote it instead of dumping a novel's worth of code to point out a minor issue), and built it functional here: `#include

include

include

struct a { int b; byte c; };

void setup() { Serial.begin(9600); }

void dostuff(void args) { a x = (a)args; Serial.println(x->b); Serial.println(x->c); delete x; }

void loop() { // put your main code here, to run repeatedly: a x; x = malloc(sizeof(a)); x->b = 0; x->c = 0x31; std::thread z(dostuff, (void )x); z.detach(); }`

It appears to be functioning properly in this case. The issue I was seeing in my app was something else, and is a moot point now. Thanks so much for the prompt replies, you helped me resolve the primary issue in my application.