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feat(scheduler-core): wire builtin_fcfs as registered default picker (task 2.4)

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Registers builtin_fcfs at scheduler startup and makes it the default
job_pick_plugin, replacing the hardcoded "xce_sched_fcfs" literal in
sched_job_picker() with a fail-loud lookup through sched_resolve_job_picker().
The picker thread now branches legacy job_elect_fn plugins (delegated
unchanged, preserving their self-contained wbuf-driven loop) from native
xce_job_picker_iface_t pickers (driven by a new per-session loop), and the
allocator now calls on_dispatch/on_pend for every picker as Req 1 AC 4
requires. Closes task 2.3's flagged picker/allocator concurrency race with a
mutex on fcfs_plugin_data_t, and adds cancel points to next_job().
This commit is contained in:
Rongsong Shen 2026-08-03 08:51:45 +00:00
parent fcb32a8b30
commit 7ee9a16f53
Signed by: rshen
SSH key fingerprint: SHA256:8Vf2pZ3h6rJa7EhGK+WaAQ9Mta/apZvteW6g9U/WKKk
11 changed files with 1036 additions and 54 deletions
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src/scheduler/include/plugin.h
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@ -97,6 +97,7 @@ extern int plugin_job_election(void*, xce_sched_job_t*);
extern int plugin_job_rusage_update(void*, xce_sched_job_t*,
xce_job_rusages_t*);
extern int register_fcfs(void*);
extern int register_builtin_fcfs(void*);
extern int register_limit(void*);
extern int register_seqjob_allocator(void*);
extern int register_parjob_allocator(void*);