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Update set priority to eliminate race condition when accessing ready list

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sBubshait
2024-10-17 06:35:39 +01:00
parent 5c09ff0149
commit 949455aae5
1 changed files with 4 additions and 0 deletions
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4
src/threads/thread.c
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@@ -389,6 +389,8 @@ thread_set_priority (int new_priority)
thread_current ()->priority = new_priority; thread_current ()->priority = new_priority;
enum intr_level old_level = intr_disable ();
if (new_priority < old_priority && !list_empty (&ready_list)) { if (new_priority < old_priority && !list_empty (&ready_list)) {
/* If the new priority is lower than the old priority, check if the current /* If the new priority is lower than the old priority, check if the current
thread no longer has the highest priority. If it doesn't, yield the CPU. thread no longer has the highest priority. If it doesn't, yield the CPU.
@@ -401,6 +403,8 @@ thread_set_priority (int new_priority)
thread_yield(); thread_yield();
} }
} }
intr_set_level (old_level);
} }
/* Returns the current thread's priority. */ /* Returns the current thread's priority. */