When to delete_fluid_player after fluid_player_join ?

[be1]

From the main GUI thread of my application, when the Play button is pressed, I start a thread that launches fluid_player_play, then waits with fluid_layer_join and finally calls delete_fluid_player on the main thread after the player thread has returned. I can interrupt playing by calling fluid_player_stop from the main thread. Unfortunately in this case, a crash appears sometimes on fluid_synth_write_*. The documentation warns* it is unsafe to delete_fluid_player after a return of fluid_player_join. But when can I delete it then ? I cannot keep the fluid_player alive since I must recreate a fluid_player to reload the (modified) MIDI file on restarting playback, and the API has only fluid_player_add to manage MIDI files. Any hint ?

[*] https://www.fluidsynth.org/api/group__midi__player.html#ga9e655b26be62b17c59319a287ef382f3

[derselbst]

The documentation warns* it is unsafe to delete_fluid_player after a return of fluid_player_join. But when can I delete it then ?

You can delete the player after joining. But additionally, you need to ensure that no other thread concurrently calls any of fluidsynth's rendering functions.