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| 00:19.23 | *** topic/#asterisk-dev is Take the March 2019 Asterisk User Survey! https://goo.gl/forms/xL1VUHRsf95saly13 -- Asterisk Development Discussion -=- http://www.asterisk.org/developers -=- Tier 2 and 3.14159265 support is in #asterisk -=- Check out our blog! blogs.asterisk.org -=- Follow on Twitter at @AsteriskDev |
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| 18:21.17 | csguth | Hi folks. |
| 18:22.04 | csguth | I'm writing a channel driver and struggling on queueing frames |
| 18:22.18 | csguth | Which are the pre-conditions for ast_queue_frame? |
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| 18:35.28 | csguth | can I call `ast_queue_frame` from an external thread? |
| 18:37.54 | file | it can be called from any thread, provided the channel pointer is valid |
| 18:38.35 | rmudgett | Not sure what you mean by external thread. Many channel drivers have some kind of monitoring thread that handles reading incoming frames from the remote. |
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| 18:44.48 | csguth | well |
| 18:45.54 | csguth | I'm writing a channel driver. That will create a thread with an event loop for delivering audio frames |
| 18:46.23 | csguth | But once I got my first frame, and I call `ast_queue_frame` but it seems the channel is locked already or something like this. |
| 18:46.29 | csguth | And it never gets unlocked |
| 18:47.10 | csguth | I'm calling `ast_channel_unlock` right after setting up my channel and before calling `ast_pbx_start` |
| 18:48.37 | csguth | And then, when my external lib reports a state change (Call started), I lock the channel, `ast_queue_control` and `ast_setstate` and then I unlock the channel. |
| 18:49.09 | csguth | When I get my frame, I try to `ast_queue_frame` without locking the channel, but it hangs until asterisk gets killed |
| 18:52.04 | csguth | even if I remove any lock, `ast_queue_frame` gets stucked and asterisk is killed |
| 18:52.24 | csguth | It seems like my channel is in the wrong state or something like this |
| 18:54.32 | rmudgett | Most of the channel callbacks in struct ast_channel_tech are called with the channel already locked. The locking order is channel then channel-driver private lock. If you have the private lock held when you try to obtain the channel lock you can deadlock. |
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| 19:01.50 | csguth | how would I hold the private lock? |
| 19:02.12 | rmudgett | The private lock is channel driver specific. It would be your lock. |
| 19:02.54 | csguth | who locks the channel driver private lock? |
| 19:02.57 | csguth | I don't have any |
| 19:04.07 | rmudgett | The private lock is to protect your internal driver information. You are the one who would lock it. |
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| 19:09.53 | rmudgett | You are also the one who would declare it. |
| 19:10.22 | rmudgett | or create it. |
| 19:11.32 | csguth | I see |
| 19:11.35 | csguth | but I don't have it |
| 19:14.24 | seanbright | k |
| 19:14.53 | seanbright | time to do some debugging then |
| 19:21.19 | csguth | yep |
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| 19:33.39 | csguth | I'm almost certain I'm hanging before calling `ast_queue_frame` ^^'' |
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