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thread: add thread.reset-on-fork

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Add a new thread.reset-on-fork property for the thread creator. when set
to false, it will clear the default SCHED_RESET_ON_FORK flag and new RT
threads will be able to fork and inherit the rt policy and priority.

When creating a thread make sure we set SCHED_RESET_ON_FORK when the
thread.reset-on-fork property is not explicitly false;

module-rt needs to preserve the SCHED_RESET_ON_FORK flag when changing
the policy.

Set thread.reset-on-fork=false explicitly for JACK clients to restore
the JACK behaviour where implementations can fork and inherit the RT
policy and priority by default.

Fixes #4966
This commit is contained in:
Wim Taymans 2025-11-06 11:35:10 +01:00
parent 1f3bc6eff5
commit 1191c18641
6 changed files with 48 additions and 11 deletions
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spa/include/spa/support/thread.h
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@ -117,6 +117,8 @@ SPA_API_THREAD int spa_thread_utils_drop_rt(struct spa_thread_utils *o,
#define SPA_KEY_THREAD_STACK_SIZE "thread.stack-size" /* the stack size of the thread */
#define SPA_KEY_THREAD_AFFINITY "thread.affinity" /* array of CPUs for this thread */
#define SPA_KEY_THREAD_CREATOR "thread.creator" /* platform specific thread creator function */
#define SPA_KEY_THREAD_RESET_ON_FORK "thread.reset-on-fork" /* reset priority and policy for real-time threads
on fork. Default true */
/**
* \}