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don't deplete RNG entropy when there is only one runnable task

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This commit is contained in:
Chris Peterson 2013-02-14 01:18:16 -08:00
parent 9a78dc93db
commit 9a76d718c7
1 changed files with 4 additions and 4 deletions
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8
src/rt/rust_sched_loop.cpp
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@ -150,10 +150,10 @@ rust_sched_loop::release_task(rust_task *task) {
rust_task * rust_task *
rust_sched_loop::schedule_task() { rust_sched_loop::schedule_task() {
lock.must_have_lock(); lock.must_have_lock();
if (running_tasks.length() > 0) { size_t tasks = running_tasks.length();
size_t k = rng_gen_u32(kernel, &rng); if (tasks > 0) {
size_t i = k % running_tasks.length(); size_t i = (tasks > 1) ? (rng_gen_u32(kernel, &rng) % tasks) : 0;
return (rust_task *)running_tasks[i]; return running_tasks[i];
} }
return NULL; return NULL;
} }