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SCHED0021: decrease chances of a race condition #105

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Oct 27, 2023
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SCHED0021: decrease chances of a race condition #105

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12 changes: 9 additions & 3 deletions apps/sel4test-tests/src/tests/scheduler.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1598,19 +1598,25 @@ static int test_simple_preempt(struct env *env)

/* Set a timeout for the test.
* Each thread should be run for one tick */
uint64_t start = time_now(env);
uint64_t now = start;

/* Start executing other threads */
ZF_LOGD("Releasing Threads");
/* Release our time slice now to get a new one. That should ensure we are
* not interrupted due to bad luck by the preemptive scheduler right after
* setting test_simple_preempt_start to 1 and then voluntarily yielding
* (which gives the preemption threads 2 time slices instead of one). For
* the same reason we are also printing the ZF_LOGD() above already.
*/
seL4_Yield();
uint64_t start = time_now(env);
test_simple_preempt_start = 1;
/* Yield should cause all other threads to execute before returning
* to the current thread. */
seL4_Yield();
test_simple_preempt_start = 0;

/* Get the total time taken to synchronise */
now = time_now(env);
uint64_t now = time_now(env);
uint64_t duration = now - start;

for (size_t thread = 0; thread < PREEMPTION_THREADS; thread += 1) {
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