I’ve been playing around with calling Julia functions from Python which has all worked fine until I try and call from a thread. To illustrate, here is a short example:
Julia code:
function add(x, y)
return x + y
end
Python code:
import threading
import time
import julia
from julia import Main # Move these two lines to add_numbers_from_julia() to call from thread
Main.include('library.jl') # ..but it will only work *once* :|
def add_numbers_from_julia():
z = Main.add(4, 5)
print(f"result = {z}")
def main():
i = -1
while i != 0:
print("Options:")
print("0 - Exit")
print("1 - Add 4 and 5")
print("2 - Add 4 and 5 from thread")
i = int(input())
if i == 1:
add_numbers_from_julia()
elif i == 2:
thread = threading.Thread(target = add_numbers_from_julia, args = ())
thread.start()
time.sleep(5)
print()
if __name__ == "__main__":
main()
In the above code, if the user chooses option 1 , we call the Julia add(x,y) function on the current thread and it all works fine.
If the user chooses option 2 we attempt to call add(x,y) from a thread, which causes an access violation. If we remove the from julia import Main and Main.include('library.jl') lines from the top of the file and put them into the add_numbers_from_julia() function, then we can successfully call add(x,y) but only once . Attempting to hit 2 again will cause another access violation.
Can someone tell me whats going wrong and where I should be importing the Julia code if I want to call it from a thread?
Many TIA