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#### Pre-Submission Checklist
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#### Type Of Change
- [ ] Small bug fix (non-breaking change which fixes an issue)
- [X] New feature (non-breaking change which adds new functionality)
- [ ] Breaking change (fix or feature that would change existing functionality)
#### Checklist:
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- [ ] PR should be backported to stable branches
- [X] Tested changes locally
- [ ] Related to issue #XXXX (replace XXXX with an open issue number)
#### Description
This PR restores the default behaviour of stable branch and makes libssl thread-guard work
opt-in.
- user's config from 5.7.3 will run unchanged
- backport tls_threads_mode = 0|1|2 from dev; user must explicitly opt-in to libssl
changes
Scenario 1: user does not change 5.7.3 configuration; then libssl thread-guards will be
disabled and Kamailio will run as before
Scenario 2: user must opt-in to libssl thread-guards; `tls_threads_mode` has been
backported from dev and user must use `tls_threads_mode = 1` in the configuration. The
default value is `tls_threads_mode = 0`
You can view, comment on, or merge this pull request online at:
https://github.com/kamailio/kamailio/pull/3754
-- Commit Summary --
* core: added tls_threads_mode global parameter
* core/rthreads.h: use global ksr_tls_threads_mode to constrain thread
* Sample etc/kamailio.cfg: global var tls_threads_mode
* tls: restore default to bypass thread guards
-- File Changes --
M etc/kamailio.cfg (17)
M src/core/cfg.lex (2)
M src/core/cfg.y (9)
M src/core/globals.h (1)
M src/core/rthreads.h (33)
M src/main.c (5)
M src/modules/tls/tls_mod.c (4)
-- Patch Links --
https://github.com/kamailio/kamailio/pull/3754.patch
https://github.com/kamailio/kamailio/pull/3754.diff
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