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This commit is contained in:
Stephen Marz 2020-05-18 09:11:41 -04:00
parent c1c8f2876b
commit 55ccc812e6
1 changed files with 3 additions and 0 deletions
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3
risc_v/src/sched.rs
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@ -9,6 +9,9 @@ use crate::cpu::get_mtime;
pub fn schedule() -> usize { pub fn schedule() -> usize {
let mut frame_addr: usize = 0x1111; let mut frame_addr: usize = 0x1111;
unsafe { unsafe {
// If we can't get the lock, then usually this means a kernel
// process has the lock. So, we return 0. This has a special
// meaning to whomever calls the scheduler to say "nobody else got scheduled"
if PROCESS_LIST_MUTEX.try_lock() == false { if PROCESS_LIST_MUTEX.try_lock() == false {
return 0; return 0;
} }