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- Mark ksq_assigned as volatile so that when this code is used without

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sched_lock we can be sure that we'll pick up the new value.
This commit is contained in:
Jeff Roberson 2003-11-17 08:27:11 +00:00
parent 093c05e39d
commit fa9c971710
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=122848
1 changed files with 3 additions and 3 deletions
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6
sys/kern/sched_ule.c
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@ -219,7 +219,7 @@ struct kseq {
int ksq_load_transferable; /* kses that may be migrated. */
int ksq_idled;
int ksq_cpus; /* Count of CPUs in this kseq. */
struct kse *ksq_assigned; /* assigned by another CPU. */
volatile struct kse *ksq_assigned; /* assigned by another CPU. */
#endif
};
@ -486,7 +486,7 @@ kseq_assign(struct kseq *kseq)
struct kse *ke;
do {
ke = kseq->ksq_assigned;
(volatile struct kse *)ke = kseq->ksq_assigned;
} while(!atomic_cmpset_ptr(&kseq->ksq_assigned, ke, NULL));
for (; ke != NULL; ke = nke) {
nke = ke->ke_assign;
@ -510,7 +510,7 @@ kseq_notify(struct kse *ke, int cpu)
* Place a KSE on another cpu's queue and force a resched.
*/
do {
ke->ke_assign = kseq->ksq_assigned;
(volatile struct kse *)ke->ke_assign = kseq->ksq_assigned;
} while(!atomic_cmpset_ptr(&kseq->ksq_assigned, ke->ke_assign, ke));
pcpu = pcpu_find(cpu);
td = pcpu->pc_curthread;