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feat(scheduler-sim-decision-trace): core trace gate and SCHED_TRACE hook macro

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Task 1.8: the core gains trace_ctl/trace_rec (NULL unless the sim REPL
sets them) and SCHED_TRACE evaluates its call only while a record is
being built.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
This commit is contained in:
Rongsong Shen 2026-10-08 08:53:40 +00:00
parent 29b6734649
commit a801aff46f
Signed by untrusted user: rshen
GPG key ID: 80533536B0EB651C
6 changed files with 482 additions and 2 deletions
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15
src/scheduler/include/sched/trace.h
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@ -87,6 +87,21 @@ typedef struct xce_sched_trace_ctl_s {
typedef struct xce_sched_trace_rec_s xce_sched_trace_rec_t;
/*
* Hook gate (Requirement 11.2). `call` (a statement or expression, side
* effects and argument evaluation included) runs only while `core` (an
* xce_sched_core_t*) has a record under construction in trace_rec, so a
* hook costs one pointer test when nothing is traced, and nothing else.
* Only the allocator thread sets trace_rec, so hooks are placed only on
* that thread. One statement: safe in an unbraced if/else.
*/
#define SCHED_TRACE(core, call) \
do { \
if ((core)->trace_rec != NULL) { \
call; \
} \
} while (0)
#define XCE_TRACE_LINE_BOUND_DEFAULT 1000 /* Requirement 9.1 */
#define XCE_TRACE_LINE_BOUND_MIN 50
#define XCE_TRACE_LINE_BOUND_MAX 100000